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FUNJET

Old 10-21-2008, 01:31 PM
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Default RE: FUNJET

I looked up your motor. Main issue is wght. 7.2 oz. If it's all you have then OK. If you can buy another, I like HET (Mega clones) get the EDF 2W-25 rated for up to 6 cells wght. 3.8 oz vs 7.2 oz............. higher kv = faster prop speed. Copy of the mega 16/25/2 I have one and I Know what it will do.

Lighter weight in a FunJet equals more FUN.

a quick motor calc on the smaller HET motor...
4 cell
APC 5.5x4.5 prop
Prop speed 140 +
est ground speed 120 +/-
Amps in the 50-55 range WOT
That's pretty quick !!!
5 and 6 cell is......... well just crazy fast!!!!!!!! Plus you'll have to get a 80 to 100 amp ESC ..........3200 plus ma battery........couple of pairs of clean under wear etc.

I guessing your turning 7 to 8 props on your current motor due to low kv ???

Oh Make sure you add Carbon fiber tubes nose to tail and wing tip to tip. A must with that monster size motor on it's butt.
CP
Old 10-21-2008, 01:59 PM
  #302  
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Default RE: FUNJET

so i should be looking for a motor with a kv of around 2600?i will be running it on 5s so i will check around,i just sold my het 2w23.it would have been a perfect fit.i still have a a 2w20 but its only good for upto 4s
Old 10-21-2008, 11:06 PM
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Default RE: FUNJET

i picked up a 2w25 for prett cheap so i will be goin with that,on a 4s 4400pak,wut servos should i buy for it,and do you have a link to a webiste thats sells the props i'm gonna need,i would like to get a couple of different ones to try them out
Old 10-22-2008, 08:49 AM
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Default RE: FUNJET

kreme.
I PMed you the info.
For everybody else...
Hobby lobby and Tower Hobby are the 2 largest. APC is the props I use. Also check into the pylon APC pops but watch the lengths as you can over amp on high kv motors.
Don't forget to balance all props. A prop spinning 28,000 + rpm out of balance will damage motor bearings quick.
CP
Old 10-22-2008, 08:51 AM
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Default RE: FUNJET

Servos
Hitec 65's drop right in. Look for metal gears if available. I am using "karbonite" with no issues so far and I'm over 100 mph.[X(]
CP
Old 10-26-2008, 07:16 PM
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Default RE: FUNJET

Do you need a folding prop with this plane? Doesn't the fixed prop break a lot?
Old 10-27-2008, 11:23 AM
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Default RE: FUNJET

mk1 spitfire

Nope no folding prop required.

You do want to have the brake on the motor OFF so prop will free wheel when landing. You will get some rough marks on the tips of the prop so buy 2-3 a a time.
make sure you balance your props.
Cp
Old 11-02-2008, 07:21 PM
  #308  
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Default RE: FUNJET

IS ANYONE ELSE HAVING PROBLEMS POSTING ON HERE
Old 11-02-2008, 09:50 PM
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Default RE: FUNJET

Guys, I thought i will add my two cents worth..I think I have heard every type combination possible,here, on what to use on a FJ! I have tried the Medusa V-2 motor, (as REP suggested)....to no real avail! I bit the bullet, and put a Mega 16/15/2/ with an APC 5.7x3 prop, and 3300 3S lipo...Now, This plane goes vertical, as fast as it goes in a power fly by! Radar is about 130mph! I tried an APC 4.75x4.75 also, and it hauls a.. in a power dive, but does not have the vertical "pull" that the 5.7x3 has. (the 4.75x4.75sounds bad as hell though, rpm wise)...I am drawing about 73 amps on full throtle, but the 54 amp thunderbird seems to handle it with no problem! My friend also has a FJ with a mega 16/15/2, and his is ballistic on APC 5.7x3...I'm going to experiment with more props.
I think that is the key, as i truly think I have the right motor! Thisw bird is FAST!!! Paul
Old 11-02-2008, 09:59 PM
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Default RE: FUNJET

FYI I just listed one of my New spare unassembled FUNJETS on EBAY for $60+shipping if anyone needs a spare.
Old 11-02-2008, 10:00 PM
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Default RE: FUNJET

I HAVE MY FUNJET SETUP WITH AN HET 2W25 MOTOR ON 4S2200 OR 4S 4400 PACKS,I MOVES WELL BUT ITS NOT AS FAST AS I WOULD LIKE IT.I THINK IM GONNA RUN IT ON A 5S 3300 PACK WITH A 5.5X4.5 PROP,LEMME KNOW WHAT U THINK,ALSO WHERE CAN I BUY SOME 4.75X.4.75 PUSHER PROPS AT?
Old 11-02-2008, 11:06 PM
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Default RE: FUNJET

johnny five is allmost alive I have turned a funjet given to my buddy bret and me into a mold so i can make it out of carbonfiber and this will help us fast funjet fan's keep are wing's from getting riped off at high speed. all i have to do now is insert the plactic into the fuse like i have done with the rudder and canapy so i can pour plaster to get my negitaive mold hive me a few weeks and it will be done here's some pic have a look at my youtube channle under b1bman look for the birth of a b1b this will give you a better idea of how this plane is being built out side of a lot of hand shaping the b1b was very little hand shaping to do with the funjet so much easyer than the b1b was
I will have some more pics and video's of this build soon if you all are intrested
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Old 11-02-2008, 11:17 PM
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Default RE: FUNJET

mikec456, if I bid on and win your FJ on e-Bay, would you wave the shipping charges and allow me to pick it up? I live nearby (near French Valley Airport).
Old 11-02-2008, 11:24 PM
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Yes that would be great
Old 11-03-2008, 11:12 AM
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Default RE: FUNJET

kremechez

Try this prop. APC 6 x 5.5 cut the length down to 5.5 to 5.3.

5.5 is the sweet spot. Match the stock tip design to your cut down prop. BALANCE it !!! You may want to purchase 3-4 to get it right.

run on 4 cell. Post your thoughts.
I'll post a motocalc spread sheet when I get home.

If your running the APC prop, and the size/numbers are and should be facing the nose of the plane,you have no need for a pusher prop.
Cp
Old 11-03-2008, 11:23 AM
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Default RE: FUNJET

paul

Which Medusa did you purchase??

I think I could get you to go faster with less amp draw...interested ???
May involve a new motor,
Cp
Old 11-04-2008, 01:18 AM
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Default RE: FUNJET

ive had sum problems handlaunching my funjet by myself.the plane seems to bank hard left as soon as i lauch it even if its trimmed out.ive seen some guys launching there birds a little sideways.is ths the solution?
Old 11-04-2008, 02:06 AM
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Default RE: FUNJET

Dude ... it might be because you are not launching her right i.e. your hand is not level or perhaps when you stand you are listing to one side. That happens often ... heheheehee ... hey am just kidding! The plane rolling to the left is normal and this is because of the props rotation. It causes the plane to roll LEFT. So you have a couple of options:

i. have someone to launch for you
ii. use a bungee
iii. set up your radio with a mix so that there is some RIGHT aileron when you launch
iv. trim her with some RIGHT trim just before launch, trim it back when she has gained altitude
v. toss her really hard with maybe just 25% throttle
Old 11-04-2008, 07:11 AM
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Default RE: FUNJET

k.
It's due to torque roll...left wing rotates to the ground.
Ok let's give out some tips

1-launch with full power always. If your running a high kv motor 3000kv plus ...you're most likely turning a small prop = low thrust but high speed. Launches are very scary.
2-When you launch raise the left wing. Rotate the plane in your hand before you throw so you're not having to think about ....raise the wing.... throw firm etc.
3-I do know and have tried a diskus launch. I have a club memeber who can do this perfect every time. If I can get with him I will shoot a launch video.
I don't use it because I'm not 1100% sure of myself to not crash the plane due to a bad throw
4-Throw hard and follow thru...aim up about 20 deg.... On my Fj I can actually throw it straight up and it will go!!!

Cp
Old 11-04-2008, 09:09 AM
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Default RE: FUNJET

funjet body free
molding clay 4.00
minwax polycrylic 10.00
plaster 30.00
carbon fiber and cevlar 100.00
epoxy 30.00
and a all carbon fiber funjet priceless
Old 11-04-2008, 09:19 AM
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Default RE: FUNJET

the 100mph + night flyer funjet
[link]http://www.youtube.com/watch?v=lQwD32yJxME[/link]
Old 11-09-2008, 12:43 PM
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Default RE: FUNJET

Hey Paul,
Do you seriously think your Funjet is going 130mph with a 3s set up on your Mega? You might want to have the radar gun used calibrated because you can't get that kind of speed on a 3s set up regardless of the prop you use. Even a motor calculator program says you'll pull about 98amps and pitch speed of about 108mph. I'm not knocking your set up but you don't want to misguide anyone new to these birds. I have plenty of Mega motors and I think they are one of the top motors out there including Neu, ARC and Hoffman Magnetics to name a few, which I do own. Unless you go to a 4s or 5s set up and a bigger motor you will not see 130mph on the Funjet. You're probably more like in the 95mph to low 100's on a 3s. Try the bigger can 16/25/x series on 4s and 5s if you want 130mph and faster. If you still think its going 130mph shoot some video and have someone doppler it. Getting the Funjet to go 130mph+ is harder than you might think, but definitely possible as others have already done it.

Jim

ORIGINAL: paulfrmphoenix

Guys, I thought i will add my two cents worth..I think I have heard every type combination possible,here, on what to use on a FJ! I have tried the Medusa V-2 motor, (as REP suggested)....to no real avail! I bit the bullet, and put a Mega 16/15/2/ with an APC 5.7x3 prop, and 3300 3S lipo...Now, This plane goes vertical, as fast as it goes in a power fly by! Radar is about 130mph! I tried an APC 4.75x4.75 also, and it hauls a.. in a power dive, but does not have the vertical "pull" that the 5.7x3 has. (the 4.75x4.75sounds bad as hell though, rpm wise)...I am drawing about 73 amps on full throtle, but the 54 amp thunderbird seems to handle it with no problem! My friend also has a FJ with a mega 16/15/2, and his is ballistic on APC 5.7x3...I'm going to experiment with more props.
I think that is the key, as i truly think I have the right motor! Thisw bird is FAST!!! Paul
Old 11-09-2008, 12:47 PM
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Hey b1b, how's your carbon Funjet project coming along. I'd be interested in a fuse or two if it all works out well. Definitely need a strong reinforced bird for the speeds we're wanting to take this thing. I'm hoping to catch up to numb_thumb with his, I believe 154mph if not faster Funjet. I'm still not all that excited about building planes, so if yours works out that will take out all the glassing and extra steps to make it capable of handling 150mph plus. Thanks.

Jim

ORIGINAL: theb1bman

johnny five is allmost alive I have turned a funjet given to my buddy bret and me into a mold so i can make it out of carbonfiber and this will help us fast funjet fan's keep are wing's from getting riped off at high speed. all i have to do now is insert the plactic into the fuse like i have done with the rudder and canapy so i can pour plaster to get my negitaive mold hive me a few weeks and it will be done here's some pic have a look at my youtube channle under b1bman look for the birth of a b1b this will give you a better idea of how this plane is being built out side of a lot of hand shaping the b1b was very little hand shaping to do with the funjet so much easyer than the b1b was
I will have some more pics and video's of this build soon if you all are intrested
Old 11-09-2008, 08:20 PM
  #324  
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Default RE: FUNJET

sound's good stay tuned more work to be done here's some more pic's
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Old 11-10-2008, 01:20 AM
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Default RE: FUNJET

Yesterday we gunned our funjet experiment at 128mph with a bushnell Speedster. 2W20 running on 2200 4s1p 25c packs with a wee baby prop Runs about 800 watts, the commentary is all in kmh, fastest pass was 206kmh.

http://media.fpv-rc.com.au/pp-sun-9t...et.mov.flv.php

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