FUNJET
05-05-2008 | 04:01 AM
#151
RE: FUNJET
I quite like the Excite or Demon. Larger F5D stuff but the airframes are a bit pricey. Gotta same some pennies. But even if I go that route I'd still keep the FJ around.
05-05-2008 | 08:59 AM
#152
Senior Member
RE: FUNJET
The FJ is fun and you can just chuck it in the back of your car. I doubt I shall go with the Boomerang etc ... I want something cheap to mess about with. I was flying like a nutter on Sunday ... come in low then roll ... exit roll inverted then execute 1/8 of a roll and turn ... at each corner of the turn you are inverted, then right side up then inverted ... you know what I mean ... like a nutter. Its cheap and you can do it! 
05-05-2008 | 01:03 PM
#153
RE: FUNJET
I got a little complacent today. First time that I have tried to launch my Funjet by myself and I made the mistake of running half throttle on left hand release from the bungee. I should have release from the bungee with no throttle and opened it up after release.
The APCe prop put 6 nice scalpel like cuts in the side of my hand and I was dripping red coolant in a matter of seconds. I was by myself at the time but fortunatley one of my fellow club members arrived literally 2 minutes later and patched me up with a first aid kit.
I'm normally very careful. Flying 12S powered models swinging a 20" prop I know one false move could hack off a limb so I always keep my finger firmly on the throttle stick. Easy to forget that even small models can cause a lot of damage. Another lesson learnt for me.
Important to enjoy flying but more important to fly safe my friends.
The APCe prop put 6 nice scalpel like cuts in the side of my hand and I was dripping red coolant in a matter of seconds. I was by myself at the time but fortunatley one of my fellow club members arrived literally 2 minutes later and patched me up with a first aid kit.
I'm normally very careful. Flying 12S powered models swinging a 20" prop I know one false move could hack off a limb so I always keep my finger firmly on the throttle stick. Easy to forget that even small models can cause a lot of damage. Another lesson learnt for me.
Important to enjoy flying but more important to fly safe my friends.
05-05-2008 | 10:27 PM
#154
Senior Member
RE: FUNJET
Oh man oh man oh man!!! Its good the cuts were not too deep. Look on the bright side now, with the scars you can tell them birds at the pub that you got it when you smashed your hand through a windscreen to protect yourself from 5 YOBs!!! How do you bungee her? I have my plane on the ground with the tow line attached and the bungee is held back with another cord. No tension on the plane and tension is taken up by the screw driver. My release mechanism is the trustly screw driver. I can launch this myself. Will put up a pic of it ... totally simple to make and super cheap. Cost me like 15 quid max.
How do you bungee her? I have my plane on the ground with the tow line attached and the bungee is held back with another cord. No tension on the plane and tension is taken up by the screw driver. My release mechanism is the trustly screw driver. I can launch this myself. Will put up a pic of it ... totally simple to make and super cheap. Cost me like 15 quid max.
05-06-2008 | 02:44 PM
#155
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From: Spartanburg,
SC
RE: FUNJET
OUCH !!!
Prop rash !!! Be care-I know to late now.
I will be building another FJ using the successes of of the first one in this post. I will start I 2 weeks as i have the Joe Nall fly in to attend May 14th-17th.
Many vendors and cheap prices
SHOPPING TIME !!
Please be careful guys as it hurts to get a screaming prop across the hand.
CP
Prop rash !!! Be care-I know to late now.
I will be building another FJ using the successes of of the first one in this post. I will start I 2 weeks as i have the Joe Nall fly in to attend May 14th-17th.
Many vendors and cheap prices
SHOPPING TIME !!
Please be careful guys as it hurts to get a screaming prop across the hand.
CP
05-06-2008 | 04:41 PM
#156
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From: Charlotte,
NC
RE: FUNJET
chippedprop,
I believe you will agree that paying attention is the most important thing and will help being safe a lot more than any assisted launch device.
I launch 37-45 o.z. 1100W-1800W Stryker while at full throttle by myself. The key is paying attention.
Just before each single launch I go through the steps in my mind. I do not rush.
_______________
One mistake that I've seen on various forums is seeing too small a prop. That will seriously hurt acceleration and launch capabilities.
Often you can listen to a guy's video and hear that the poor prop is not fully biting into the air and the watts are being wasted.
Given any number of cells, the prop size should be big enough to draw at least mid level amps.
Keeping the amps to a minimum could be a mistake, and that is even a bigger mistake as the volts go up given any particular motor.
Given any particular motor as the volts go up, the prop size goes down to maintain same amps, but then at some point the prop size is too small given the speed/drag/thrust combination. At those times increase in diameter will help the situation.
If such a situation arises with 5X5, a person should try 5.25X4.75, or even 5.5X4.5. Increased static amps will drop some at high speed when the pitch is less than diameter.
For 4.7X4.7, I would look for a prop in the 5X4.5 size (not sure who might make that size), or take the 5.5X4.5 and cut it down some.
With the bigger diameter props, the plane will have better flying characteristics, easier launch and better climbing and acceleration.
Too high a KV, voltage, or RPM noise (wow factor) or pitch speed is not always the key. With a perfectly matched setup a plane will fly much better and will be much more enjoyable.
Class is in session (for newbies):
Assuming a person wants to have a setup at 40A but prop size is too small. They can move away from 1:1 diameter to pitch ratio prop. They can choose a prop that has lower pitch number than diameter. They can prop for 42-45A static, but knowing that in flight they will drop to 40A. This way during launch or hard climbing, they will have little more power and a better prop that can also bite more/better into air, and then during the rest of the flight they can be down to 40A range (level wide open throttle at high speed).
Don't get me wrong there is nothing wrong with 1:1 props when they are of sufficient diameter size for an airframe and speed range. But copying mistakes of other rookies does not make it a good combination.
The above post is assuming sufficient breathing room left as far as MOTOR/ESC and battery goes.
________________________
I look forward to seeing you at the Joe Nall fly in.
Is it a B-Y-O-B?
Gryphon
I believe you will agree that paying attention is the most important thing and will help being safe a lot more than any assisted launch device.
I launch 37-45 o.z. 1100W-1800W Stryker while at full throttle by myself. The key is paying attention.
Just before each single launch I go through the steps in my mind. I do not rush.
_______________
One mistake that I've seen on various forums is seeing too small a prop. That will seriously hurt acceleration and launch capabilities.
Often you can listen to a guy's video and hear that the poor prop is not fully biting into the air and the watts are being wasted.
Given any number of cells, the prop size should be big enough to draw at least mid level amps.
Keeping the amps to a minimum could be a mistake, and that is even a bigger mistake as the volts go up given any particular motor.
Given any particular motor as the volts go up, the prop size goes down to maintain same amps, but then at some point the prop size is too small given the speed/drag/thrust combination. At those times increase in diameter will help the situation.
If such a situation arises with 5X5, a person should try 5.25X4.75, or even 5.5X4.5. Increased static amps will drop some at high speed when the pitch is less than diameter.
For 4.7X4.7, I would look for a prop in the 5X4.5 size (not sure who might make that size), or take the 5.5X4.5 and cut it down some.
With the bigger diameter props, the plane will have better flying characteristics, easier launch and better climbing and acceleration.
Too high a KV, voltage, or RPM noise (wow factor) or pitch speed is not always the key. With a perfectly matched setup a plane will fly much better and will be much more enjoyable.
Class is in session (for newbies):
Assuming a person wants to have a setup at 40A but prop size is too small. They can move away from 1:1 diameter to pitch ratio prop. They can choose a prop that has lower pitch number than diameter. They can prop for 42-45A static, but knowing that in flight they will drop to 40A. This way during launch or hard climbing, they will have little more power and a better prop that can also bite more/better into air, and then during the rest of the flight they can be down to 40A range (level wide open throttle at high speed).
Don't get me wrong there is nothing wrong with 1:1 props when they are of sufficient diameter size for an airframe and speed range. But copying mistakes of other rookies does not make it a good combination.
The above post is assuming sufficient breathing room left as far as MOTOR/ESC and battery goes.
________________________
I look forward to seeing you at the Joe Nall fly in.
Is it a B-Y-O-B?
Gryphon
05-07-2008 | 02:58 AM
#157
Senior Member
RE: FUNJET
Me suspects Gryphon is really old or a lecturer ... hmmmmmm ... hehehehe ... I use 4.7 x 4.25 ... less pitch ... heheheehee ... Anyways, when I launched my UF Hawk it clipped my fingers, 3 fingers bled ...
05-07-2008 | 01:14 PM
#158
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From: Charlotte,
NC
RE: FUNJET
tIANci,
Yeah, my posts are on the long side. Some times in there things could be thought to people who read the pages, well at least the ones who come to the pages to learn.
Since you and I have had a bunch of PMs and discussions, I know that you do have full grasp of what goes on. Your Funjet is setup nicely and your future goals are going to be winners.
How bad were your cuts?
Because of my mistake, I hurt my brother’s hand over 2 years ago and I still have not forgiven myself. It was not so serious but it could have turned out that way. I would have rather done it to my own hand than to his. So just before each lunch I really do go through the motions in my head and I do imagine that the prop is trying to hurt me. I then launch in a way that it can’t even if it tried.
I launch at maybe 30 degrees above the horizon as if I’m throwing a Javelin for maximum distance and the key is that I follow the motion through to get my hand out of the way (away and down).
Since I do that while at full throttle and with up elevator trim, heavy birds have no problem going right up, and that buys me enough time to get my hand back on the transmitter.
_____________________________
My current experimental bird at 2 ½ times stock weight (heaviest yet) cannot get airborne on 3S without wind. It is designed for 5S, 6S. So my 5S-5000 is going in for next flight. Power will be doubled and 7†prop will make enough thrust.
I guess we all like to experiment and find the limits….one way or another.
I’ll send you a link to a 2000W Stryker video. Hand launched by pilot without effort.
Gryphon
Yeah, my posts are on the long side. Some times in there things could be thought to people who read the pages, well at least the ones who come to the pages to learn.
Since you and I have had a bunch of PMs and discussions, I know that you do have full grasp of what goes on. Your Funjet is setup nicely and your future goals are going to be winners.
How bad were your cuts?
Because of my mistake, I hurt my brother’s hand over 2 years ago and I still have not forgiven myself. It was not so serious but it could have turned out that way. I would have rather done it to my own hand than to his. So just before each lunch I really do go through the motions in my head and I do imagine that the prop is trying to hurt me. I then launch in a way that it can’t even if it tried.
I launch at maybe 30 degrees above the horizon as if I’m throwing a Javelin for maximum distance and the key is that I follow the motion through to get my hand out of the way (away and down).
Since I do that while at full throttle and with up elevator trim, heavy birds have no problem going right up, and that buys me enough time to get my hand back on the transmitter.
_____________________________
My current experimental bird at 2 ½ times stock weight (heaviest yet) cannot get airborne on 3S without wind. It is designed for 5S, 6S. So my 5S-5000 is going in for next flight. Power will be doubled and 7†prop will make enough thrust.
I guess we all like to experiment and find the limits….one way or another.
I’ll send you a link to a 2000W Stryker video. Hand launched by pilot without effort.
Gryphon
05-07-2008 | 02:32 PM
#159
Senior Member
RE: FUNJET
Gryphon ... my cuts were not that bad, maybe a teaspoon full of blood? Hehehehee ... first 2 launched on the Hawk were good as I launched it with my hand pulling away on a downward arch, the 3rd launch I was excited and I launched her in the 'normal' way ... The FJ is really easy to launch ... I get my pals to do it for me and usually I am on about half throttle. The Stryker at 2KW is nuts ... totally nuts, but its an inspiration for me to go with a 6S FJ set up ...
Neu motor ... Flight Power EVO30 3S 2,000 x2 ... we should be seeing about 43K RPM right on a 4.75 x 4.75? Hehehehee ... let her scream! On the other hand I still have my Zagi TAZZ ...
Dig the ECalc ... me likes ... me liking very much ...
Neu motor ... Flight Power EVO30 3S 2,000 x2 ... we should be seeing about 43K RPM right on a 4.75 x 4.75? Hehehehee ... let her scream! On the other hand I still have my Zagi TAZZ ...
Dig the ECalc ... me likes ... me liking very much ...
05-07-2008 | 07:58 PM
#160
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From: Charlotte,
NC
RE: FUNJET
tIANci,
I'm fairly sure that you didn't notice that is a 7.5 o.z. motor. [)] .............................and $205
You can have 30%-60% more power than your chart from 3.9 o.z. MEGA 16/25/X $95 or NEU 1110 series $125 and they are 28mm unlike the 36mm diameter beast you found in ez-calc. (The 2Y wind version of your motor above is what was in that Stryker with CC 125A ESC)
Trust me, at very high speed you are better off with 5" to 5.5" prop (forget 5" for ULTRA speed). You can control prop size with your KV selection to get same watts from larger diameter prop.
You can swing a 7" prop if you want, but with 8" pitch, so RPM is not everything. Pitch speed is attainable in other ways with regard to thrust needed.
I'll send you a PM.
Gryphon
I'm fairly sure that you didn't notice that is a 7.5 o.z. motor. [)] .............................and $205
You can have 30%-60% more power than your chart from 3.9 o.z. MEGA 16/25/X $95 or NEU 1110 series $125 and they are 28mm unlike the 36mm diameter beast you found in ez-calc. (The 2Y wind version of your motor above is what was in that Stryker with CC 125A ESC)
Trust me, at very high speed you are better off with 5" to 5.5" prop (forget 5" for ULTRA speed). You can control prop size with your KV selection to get same watts from larger diameter prop.
You can swing a 7" prop if you want, but with 8" pitch, so RPM is not everything. Pitch speed is attainable in other ways with regard to thrust needed.
I'll send you a PM.
Gryphon
05-07-2008 | 10:12 PM
#161
Senior Member
RE: FUNJET
Gryphon ... I know its a 36mm just tongue in cheek ... hehehehe ... that is one lump of lead! I am sticking to my Mega 16/15/3 as it will happily take 3S and 4S and on 4S I can still mainting the 4.75x4.75 but need to be more disciplined on the throttle, if not I just swap props when I wanna fly 3S or 4S. Still very practical to me.
I think for the 6S set up I am going to get a new FJ. I just ordered some 28mm motors from Hobby City, I got 2 ... just in case 1 burns! I checked with the LHS and they are out of FJ for the moment, looks like me messing and zipping about has helped them move their stock.
I will up date you guys when it all happens.
I think for the 6S set up I am going to get a new FJ. I just ordered some 28mm motors from Hobby City, I got 2 ... just in case 1 burns! I checked with the LHS and they are out of FJ for the moment, looks like me messing and zipping about has helped them move their stock.
I will up date you guys when it all happens.
05-10-2008 | 01:38 AM
#162
Senior Member
RE: FUNJET
Okay ... went to the field this morning and tached her, I got about 34,000 RPM, that gives me a 150+ mph pitch speed. I wonder how much of that translates to the air speed. How does she fly on 4S compared with 3S?
Upon launch I can see that the higher wing loading is obvious, she wants to roll to the left now despite being launched at about 50% throttle only. Hence, launch air speed is lower. I can feel that the FJ is sluggish, I went for a couple of mins of easy flight then I opened up the throttle. You can hear the baby scream! Came in for a pass and I was disappointed, it was faster than the 3S set up but I estimate maybe an extra 15 mph max. In turns she is no longer as nimble as before, I am still on the ESky servos so I am rather careful but the higher wing loading now makes her sluggish. Flying slowly is different now too ... the wing was about to stall a few times on me, I cannot cruise as slow as on a 3S anymore.
I ran her for a few passes and I would love another 30 mph if possible. Increase in power is about 200W but increase in speed maybe only 15 mph. Sad man ... I wonder if I should bother with a 6S set up anymore ...
Upon launch I can see that the higher wing loading is obvious, she wants to roll to the left now despite being launched at about 50% throttle only. Hence, launch air speed is lower. I can feel that the FJ is sluggish, I went for a couple of mins of easy flight then I opened up the throttle. You can hear the baby scream! Came in for a pass and I was disappointed, it was faster than the 3S set up but I estimate maybe an extra 15 mph max. In turns she is no longer as nimble as before, I am still on the ESky servos so I am rather careful but the higher wing loading now makes her sluggish. Flying slowly is different now too ... the wing was about to stall a few times on me, I cannot cruise as slow as on a 3S anymore.
I ran her for a few passes and I would love another 30 mph if possible. Increase in power is about 200W but increase in speed maybe only 15 mph. Sad man ... I wonder if I should bother with a 6S set up anymore ...
05-10-2008 | 01:51 AM
#163
RE: FUNJET
Hey Tianci...there are limits to the FJ anyway. Unless we're prepared to spend our hard earned on motors we're not gonna go much faster. I'm happy with the speed I've got. My recommendation is to go for a Mega motor as used by the chaps in the YouTube vid for 6S or get another more sleek moulded airframe.
05-10-2008 | 02:16 AM
#164
Senior Member
RE: FUNJET
Ditchit ... I will keep the 2 motors that I ordered, can use them in 90mm EDF for a 5S set up since they are about 2,300KV max. I think if I wanna go fast it has to be a slicker airframe ... can't imagine my current 4S set up on something like the FVK planes ... Boomerang on 4S ... the wings might fold! Hey why are you up so early on a Sat? Going to the field? I am stuck at a client's golf club handling their property fair, its so so so boring ... they won't let me fly a foamie on the course! FJ is in the car boot too ...
05-13-2008 | 09:18 AM
#165
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From: Spartanburg,
SC
RE: FUNJET
Hey All
I'll be attending the Joe Nall fly in this Friday - I'll be snooping the pits looking for fast foamies - I hope to do a lot of filming and will post over the weekend stay tuned and watch for
Chippedprop Videos on RCUVideos and maybe you tube.
I may even get to fly on site.
http://www.joenall.com/
If your going we may see each other
Later
CP
I'll be attending the Joe Nall fly in this Friday - I'll be snooping the pits looking for fast foamies - I hope to do a lot of filming and will post over the weekend stay tuned and watch for
Chippedprop Videos on RCUVideos and maybe you tube.
I may even get to fly on site.
http://www.joenall.com/
If your going we may see each other
Later
CP
05-13-2008 | 11:23 AM
#168
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From: wilmington, DE
RE: FUNJET
I have one of these that does 149 on 6 cells, it is the same one that is featured in the RC/U magazine .. mega 16/25/3 motor, 5.9x5.9 prop, glassed fuse.. it is a HOOT to fly and doesn't need Gyros! it DOES need a lot of EXPO what travelling at warp speed and a careful hand launch since there is a lot of torque that tends to twist the beast to the left until it gets up to speed whuih is very fast... I plan on enlarging this design (2X) and running it on a turbine someday I too will be at the NALL
!!!
!!!
05-13-2008 | 01:12 PM
#169
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From: Charlotte,
NC
RE: FUNJET
geh3,
This Friday I'll be at JOE NALL and will be meeting up with Chippedprop.
If you want to meet and hang out for a bit, send one of us some kind of contact info like a cell number, etc...
If interested, you can send a PM.
If you can, please post a pic of your plane, another pic from under the hatch would be the icing on the cake.
Have fun,
Gryphon
This Friday I'll be at JOE NALL and will be meeting up with Chippedprop.
If you want to meet and hang out for a bit, send one of us some kind of contact info like a cell number, etc...
If interested, you can send a PM.
If you can, please post a pic of your plane, another pic from under the hatch would be the icing on the cake.
Have fun,
Gryphon
05-13-2008 | 04:26 PM
#170
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From: Charlotte,
NC
RE: FUNJET
northchim,
Not sure how well the Gyro can handle hard landings and crashes.
I can tell you that the FMA Co-pilot part # CPD4 for $69 is the real deal.
Only drawback is its 1"X1"X1/2" infra red sensor that needs to be mounted outside causing some drag. And its performance gets weak over snow.
It works just as well in the pitch black night.
It was a deal at $125 for years till it became a steal for $69.
http://www.fmadirect.com/detail.htm?...489§ion=20
Lots of my friends and I have several each. It could be left on or toggled with on and off switch as you see fit.
If you like to see pictures of several Stykers with the Co-pilot sensor, let me know. PM will be o.k.
Gryphon
Not sure how well the Gyro can handle hard landings and crashes.
I can tell you that the FMA Co-pilot part # CPD4 for $69 is the real deal.
Only drawback is its 1"X1"X1/2" infra red sensor that needs to be mounted outside causing some drag. And its performance gets weak over snow.
It works just as well in the pitch black night.
It was a deal at $125 for years till it became a steal for $69.
http://www.fmadirect.com/detail.htm?...489§ion=20
Lots of my friends and I have several each. It could be left on or toggled with on and off switch as you see fit.
If you like to see pictures of several Stykers with the Co-pilot sensor, let me know. PM will be o.k.
Gryphon
05-14-2008 | 09:42 PM
#171
Senior Member
RE: FUNJET
I lost No. 2 due to glitching, the flight was everywhere so immediately brought her in for landing, on final she decides do her own thing, was not a bad crash, just that the fuse broke and was bent, decided to get a new one. I got a Turnigy 2845-2100 KV motor for a 6S set up ... tested her out last night and she can scream, was only pulling no more than 45A on an APC 4.75 x 4.75 CF prop. Gonna start to build No. 3 tonight and should be able to maiden her on Fri afternoon. I wonder how many RPMs will I get ... Also, I wonder how long before I burn the motor!
05-21-2008 | 09:19 AM
#172
Senior Member
RE: FUNJET
I got my motor/esc/servos in for No. 3. Only need to hook up a switch to the ESC from my 5 cell AAA pack and then sort out the aileron horns hook up. Then she is ready to fly. I am short of a spare switch and the CF strips so I am taking my time. I hope to get her up this weekend on 4S if I cannot get the CF strips in time, looks like all the LHS are out of stock!
Checked her CG and the placement of my ESC/rx pack is just right for 4S and 6S set up ... still have space to move the batteries in either 4S or 6S configuration. This is good! Still she does feel heavy compared with a 3S set up.
Tested the motor out and this is what I got on the watt meter:
Flight Power EVO25 4S 2,500 - APC 4.75 x 4.75 CF - approx 450W @ 28A
Flight Power EVO25 6S 1,800 - APC 4.75 x 4.75 CF - approx 950W @ 45A
I may go with a 5x5 for 4S since I am only pulling 28A, maybe with the 5x5 I can touch about 35A. I will test the system out maybe tomorrow to see how many RPMs the prop is giving me. Will update you ok!
Also I found out why I busted the last motor, initially I thought the prop nut was not balanced ... that is wrong, it was my BAD! I put on the collet the wrong way!!! The rough part that the prop sits in was facing the other way ... man am I stupid or what?!
Checked her CG and the placement of my ESC/rx pack is just right for 4S and 6S set up ... still have space to move the batteries in either 4S or 6S configuration. This is good! Still she does feel heavy compared with a 3S set up.
Tested the motor out and this is what I got on the watt meter:
Flight Power EVO25 4S 2,500 - APC 4.75 x 4.75 CF - approx 450W @ 28A
Flight Power EVO25 6S 1,800 - APC 4.75 x 4.75 CF - approx 950W @ 45A
I may go with a 5x5 for 4S since I am only pulling 28A, maybe with the 5x5 I can touch about 35A. I will test the system out maybe tomorrow to see how many RPMs the prop is giving me. Will update you ok!
Also I found out why I busted the last motor, initially I thought the prop nut was not balanced ... that is wrong, it was my BAD! I put on the collet the wrong way!!! The rough part that the prop sits in was facing the other way ... man am I stupid or what?!
05-21-2008 | 05:54 PM
#173
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From: Spartanburg,
SC
RE: FUNJET
[sm=thumbup.gif]TIANci
Well just remember your NOT the only one who has put something on upside down and backwards
The numbers look great
Let me know what you think of that motor.
How heavy are the end plates.
Bearings??
Over all construction good bad.
After you fly it couple of times is it still tight i.e. bearings holding up
My e-flite is just about shot and it got 50-75 flights on it
Can you shot some vids.
Include set up and talk us thru it
Flight vids. try to set camera to manual focus-pick a target at 3/4 of the camera total focus and dail it in
SMILE
CP
Well just remember your NOT the only one who has put something on upside down and backwards
The numbers look great
Let me know what you think of that motor.
How heavy are the end plates.
Bearings??
Over all construction good bad.
After you fly it couple of times is it still tight i.e. bearings holding up
My e-flite is just about shot and it got 50-75 flights on it
Can you shot some vids.
Include set up and talk us thru it
Flight vids. try to set camera to manual focus-pick a target at 3/4 of the camera total focus and dail it in
SMILE
CP
05-21-2008 | 10:19 PM
#174
Senior Member
RE: FUNJET
Chipped ... sigh ... walk through? Sheesh ... I closed the hatch and did not take any pics!!! Hehehehehe ... don't worry its simple for me ... 5 cell NiMH AAA rx pack (hump pack configuration) just for of the spa. RX is opposite it, fits snug.
My take on the motor is simple ... its hardly enough but I do not think she will take a lot of abuse for sure. Overall construction is good enough for sure. End plates look like they will hold up. The bearings are smooth but I doubt its heavy duty stuff. I will only be going WOT for low passes, use it sparingly. But then again, the motor is cheap, no more than USD30 a piece. That is why I got 2 pieces ... waiting for this one to knock off.
Okay the verdict of a cheap motor? Its CHEAP!!! Aaaarrrrgggghhh ... I only tached 35,000 RPM ... sad man ... so sad ... but for the price of USD30 ... what can I say?
I shall do my best to get a video in by next weekend, still need to get some CF strips and reinforce the wing!
My take on the motor is simple ... its hardly enough but I do not think she will take a lot of abuse for sure. Overall construction is good enough for sure. End plates look like they will hold up. The bearings are smooth but I doubt its heavy duty stuff. I will only be going WOT for low passes, use it sparingly. But then again, the motor is cheap, no more than USD30 a piece. That is why I got 2 pieces ... waiting for this one to knock off.
Okay the verdict of a cheap motor? Its CHEAP!!! Aaaarrrrgggghhh ... I only tached 35,000 RPM ... sad man ... so sad ... but for the price of USD30 ... what can I say?
I shall do my best to get a video in by next weekend, still need to get some CF strips and reinforce the wing!
05-22-2008 | 01:27 AM
#175
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From: Charlotte,
NC
RE: FUNJET
Comparison of $95 MEGA 16/25/3 and 16/25/2.
16/25/3 can take about 50% more voltage (more cells) while the 16/25/2 can take about 50% more amps (larger cells).
16/25/3 60A is O.K.
16/25/2 90A is O.K.
Power increases as you go down the list:
16/25/3 3S 8X8
16/25/3 4S 7X7, 7X8
16/25/2 3S 7X7 90A 138 MPH prop pitch speed. (147 pitch speed with 7X8 not recommended)
16/25/3 5S
16/25/3 6S & {16/25/2 4S APC 4.7X4.25 35,000RPM 46/47A on 4S-3850 25C}
16/25/3 7S
16/25/2 5S APC 5X5 37980 RPM, 180MPH prop pitch speed, 81.5A (not maxed out yet), TP 5S-3300 25C(barely under sized).
So it can clearly be seen that without going to High voltage ESC and 8S the 16/25/2 is a superior motor for Funjet as compared to 16/25/3.
16/25/3 9S & 16/25/2 6S Will be running props that are too small in diameter for good performance.
So max performance is somewhere between 16/25/2 on 5S and 16/25/3 8S. It is better to error on side of caution by running a bigger prop to make sure that a drag wall is not reached as far as thrust from prop compared to drag of airframe at ultra high speed.
Maybe 16/25/2 2650KV on 5S and APC E 5.25X4.75 for all around fun, acceleration, climbing and speed (when very high speeds are intended). CC80A ESC with 120A burst will work.
Gryphon
16/25/3 can take about 50% more voltage (more cells) while the 16/25/2 can take about 50% more amps (larger cells).
16/25/3 60A is O.K.
16/25/2 90A is O.K.
Power increases as you go down the list:
16/25/3 3S 8X8
16/25/3 4S 7X7, 7X8
16/25/2 3S 7X7 90A 138 MPH prop pitch speed. (147 pitch speed with 7X8 not recommended)
16/25/3 5S
16/25/3 6S & {16/25/2 4S APC 4.7X4.25 35,000RPM 46/47A on 4S-3850 25C}
16/25/3 7S
16/25/2 5S APC 5X5 37980 RPM, 180MPH prop pitch speed, 81.5A (not maxed out yet), TP 5S-3300 25C(barely under sized).
So it can clearly be seen that without going to High voltage ESC and 8S the 16/25/2 is a superior motor for Funjet as compared to 16/25/3.
16/25/3 9S & 16/25/2 6S Will be running props that are too small in diameter for good performance.
So max performance is somewhere between 16/25/2 on 5S and 16/25/3 8S. It is better to error on side of caution by running a bigger prop to make sure that a drag wall is not reached as far as thrust from prop compared to drag of airframe at ultra high speed.
Maybe 16/25/2 2650KV on 5S and APC E 5.25X4.75 for all around fun, acceleration, climbing and speed (when very high speeds are intended). CC80A ESC with 120A burst will work.
Gryphon
