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FUNJET

Old 07-12-2008, 11:21 PM
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Default RE: FUNJET

Guys,

There is a guy who wants to sell the following:

Stock F-27C Motor + prop adapter + 4 props: $45 shipped.
ESC: $35 shipped.

Combo: $75 shipped.

When his replacement F-27C from Horizon hobby arrived yesterday he tried to fly it and when during Maiden it hit the ground right after launch (not badly) he went mental......

Another guy bought the fuse and radio and such as far as I know.

The above is what he has left...everything is documented on a thread somewhere and I've been reading it.


If interested send me a PM and I'll put you in touch with him.
______________________

Testing has showed 500W on 4S by other guys on identical motor....different battery and ESC using APC E 6X5.5

Gryphon
Old 07-23-2008, 01:14 PM
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Default RE: FUNJET

Here is my FunJet on 6S, specs are as follows:

Motor - KB28-47 2100KV (from H0bbyCity)
ESC - HiModel 60A, onboard 5 cell AAA pack
Batt - Flight Power EVO25 3S 1,800 in series
Prop - 4.75 x 4.75
Servos - HS56

I don't think she is that fast, looks fast in the video only. Anyways, the video is kinda cr@ppy but maybe someone can use the doppler thingy to let me know how fast she is suppose to be doing. I think its no more than 95 mph.

http://www.youtube.com/watch?v=zYUMesHV6wI
Old 07-31-2008, 11:59 AM
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Default RE: FUNJET

tIANci,

Ever figure out how fast she was going? Any Doppler data? What was the Amp, Watt, RPM results (if you recall)?


Gryphon
Old 07-31-2008, 08:33 PM
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Default RE: FUNJET

I would think its doing more than 95, or at least would hope so. I can easily get 95mph on a 3s set up. hehe I always laugh to, when I see people running with the Funjet to toss it. I've had some pretty heavy Funjet's and just toss it straight and level like a javalin and have never had one hit the ground. I've had torque roll on the really high kv motors, but no more than about a foot of drop on small props. I've seen more wrecks with people trying to throw planes like the Funjet, Lynx, etc. at 45 degree angles and higher, just to have it head towards the ground. Air flow under the wing, not how high you can get it. I'm just hoping to save some planes by making this statement, not put anyone down.

Hopefully someone will dopler your video. I'm anxious to see how fast its going. If its not going over 100mph, I'll be shocked. Hard to see your plane in the video, but just from the sound of it, I'm saying easily over 100mph. I see, Gryphon standing by. Can't wait to see his comments. hehe WHAT'S UP GRYPHON!

Jim

Healing up nicely, should be flying in the next couple days.
Old 07-31-2008, 09:33 PM
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Default RE: FUNJET

Gryphon ... I got no idea about how fast she is going, will try to get someone to doppler it. Anyways, I feel its just slow and a FJ should be set up with 3S 2,200 or maybe 4S 2,200 only with something like a Mega 16/15/3 only. Anything else and you truly pay the penalty of a higher wing loading. Oh yes ... I went 6S again the other day to chase the 40 sized nitro pylon planes, 2 home made and 1 Sonic 500. I could give them a run for their money and did beat 2 of them. The fun part was I bloated my batts! I know they would bloat but who cares right? We are talking bragging rights here ... heheheehehe ...

Jim ... I know what you mean about launches, the love to throw it UP since planes should go UP. I dread it when that happens. Then you have those who feel the thrust and they give you a limp launch. I always tell my friends to launch her level, I can even bare if its slightly downwards but some seem to have the idea that UP is always better.
Old 08-01-2008, 09:03 AM
  #231  
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Default RE: FUNJET

Well it's been a while but, I'm back from the beach and so is the FJ.
Here is the latest FJ. If you look back you will see the first that I used as a test bed for the mods. Flys well. It does have a little wiggle due to wing tip vortex. Now I know why Multiplex added the wing tip tank look. Working on a solution.
The current plane is flying with a Micro Dan 2800kv outrunner. E-flite 60amp esc , timed at 20 degrees. APC 5.5x4.5 prop. Runs in the 80-90 mph with low amp draw. I have run APC 6.5x5.5 on it also runs low to mid 90's That's on 3 cells. Haven't tried 4 cell yet.

This combo flys great and the motor is only 55 bucks.
http://www.gobrushless.com/shop/inde...&ref=MD2505-SP
HERE"S SOME PICS>
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Old 08-01-2008, 02:40 PM
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Default RE: FUNJET

Looks great Chippedprop! I haven't tried the speed motor, but I do have the 5100kv and 2510 3D motor and they're actually pretty good motors. Hey, what's that long wire you got going under the right wing? Is that an antenna wire or you running something else in there?

Jim
Old 08-01-2008, 04:21 PM
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Default RE: FUNJET

would this be a good motor for the FJ?
KB28-47-08S 4900kv Brushless
Shaft Size: 3.17mm~12mm
Motor Dimensions: 28mm~48mm
Weight: 163g
Kv: 4900
Idle current: 2.8A
Resistance: 0.0095
Max Amp: 50
I do not know much about electrics, so please Help!
Old 08-02-2008, 09:22 AM
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Default RE: FUNJET

jimweda
yes I route the wire so it's in 2 directions on the plane. Make sure you DON'T route it thru the carbon/fiberglass tube as it reduces the signal strenght.
Old 08-02-2008, 09:37 AM
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Default RE: FUNJET

slick top

I'm thinking no.
Here's a choice of known motors>>tested to be tried and true:
Het - 4 turn 2200 kv about 60-65 $
E-flite 6 pole 2700kv 70-80 $
medusa research 28-40 2500kv V2 70-80$
mega motors 16-25 -2 2650kv 120 $

All of these will work and mount into the stock mount. You need a minium of a 60 amp ESC I use e-flite but you can use a quailty one NOT a no name brand one.
same on rec. you want to go with a top name brand. I have found that you get what you pay for. Plus if you crash an destory parts most top mfg. will replace for 1/2 price.
The next will be batterys. You need 20c minium 2200ma. the larger the c rating the harder you can push them. I am using 30c rated 2200ma currently. Again batterys are your gas tank and if they can't produce then everything else is a waste.

The table posted is one that I go by on the Stryker thread. All have been tested and info is correct. On a Funjet they perform even better due to reduced drag on the airframe.
Props can stay the same.
CP

Oh the current set with battery ready to toss weighs 20 oz
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Old 08-02-2008, 01:30 PM
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Default RE: FUNJET

Chipped~

Thanks for the info. It is a big help. I guess the high kv is not as inportant as I thought. Thanks agian.
Old 08-02-2008, 02:36 PM
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Default RE: FUNJET

slicktop
kv and low resistance is the key. Many think that the higher the kv the faster it will go. You have to include in the plan the amp draw. Ducted fan motors have huge kv to get high rpms to equal thrust. They draw big amps. You can still draw big amps with a prop but you also want a balance of amps and rpms and thrust.

Using the motors in this table will insure just that. You can run the mega within the specs. and easily turn 150's mph.
Promise
CP
Old 08-02-2008, 02:48 PM
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Default RE: FUNJET

So the KDA 28-47-15turn S is better than the KDA 28-47-09turn S. It seems the kv is higher on the 09 and the resistence is lower as well. The 15 lists it's max current at 27A and the 09 states a max current of 45A. I guess I still don't have this down yet. Workin on it!
Old 08-02-2008, 04:37 PM
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Default RE: FUNJET

slicktop

I understand the lure of a cheap motor..........cost. I can tell you that you won't be happy with those motors. You get what you pay for. I would stay away from those.
I would incourage you to use the motors of of the chart. Yes they cost more. In the long run they perform better,how,cheap motors run hot,heat is wasted power=slower plane. The less waste in heat = more power and speed. I still have the 1st motor I bought 3-4 years ago. Multiplex 480 6D still runs.

I can't state the difference between low cost and high end. If you can just want and save up. Check you Local hobby Shop...many have lay away...i use this a lot as I'm a low budget flyer. You will be much more happy for years if you purchase a quailty motor.
CP

If cost is really an issue PM me your budget and I'll shop for you.
Old 08-02-2008, 09:57 PM
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Default RE: FUNJET

OK! Last one. I just bought the Graupner spinner hub and a Cam speed prop for it. Do these need to be pusher props or can you wire them to reverse the spin. I know it is probably the stupidest question out there but I could not find and pusher that was the right length and pitch. SO......give it to me straight as a complete beginner.
Old 08-03-2008, 11:07 AM
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Default RE: FUNJET

slick ... nothing stupid about the question, I have glow pals who start out on the FJ and they done some of the most interesting things with the prop. The prop is put onto the motor with its face facing the nose of the plane, you then wire her up and see which way its rotating, if its wrong then change any of the 2 motor wires.

As for your motor selection I have run the KD28-47 3,000 KV ... she is nice on 3S and a 5x5 prop. Only thing is the motor is heavy and you will be pushing your 3S 2,200 packs all the way to the front. If you are running a 3S 2,500 pack then it can sit further back. The 3,000 KV motor will pull almost 50A. I used this set up on 2 FJs for my pals, they are happy with it.

I am running the KD28-47 2,100KV motor for mine ... its a 4S set up and I am happy with it.
Old 08-03-2008, 01:11 PM
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Default RE: FUNJET

tIANci~

Thanks.....I was hoping that was the case because the Graupner prop I bought was not a pusher so I wasn't sure. I am putting a 3s 2500 so hopefully it will balance out well. I will glass the FJ first so I have some down time before the testing trials begin. Thanks agian all for the input and help. I need it!

Slicktop
Old 08-03-2008, 10:49 PM
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Default RE: FUNJET

Slickman ... why do you need to glass her? If you want to reinforce her then just do this ... I insert CF strips, vertically, into the wings and nose of the FJ. Here is a pic as to what I do and I am sure you will get it. Just slit, insert and CA only.
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Old 08-04-2008, 08:30 AM
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Default RE: FUNJET

slicktop
TIANci is right you really don't need to glass it. In the end it just adds unwanted weight. I replaced the stock white tube with the same size carbon fiber tube and extent it wing tip to wing tip. I also add a carbon fiber tube tail to as far front as I can get , but it's on the inside/floor of the plane. The outside bottom of the plane curves making it difficult to complete.
Takes a little work to install but really stiffens the entire plane.
CP
Old 08-04-2008, 01:14 PM
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Default RE: FUNJET

slicktop,

Looks like your PM to me about the 4900 KV motor was sent before your post here. I was out of town and I can see that you got great help from the very knowledgeable folks here.


*** I wrote up a reply (before seeing/reading this thread) but it would not go through.

It looks like you have your preferences set to not receiver a PM. You may want to check on that or change it so you can receiver PM(s).

If you still want it(my reply) sent, then enable your receiving of PMs. I have the reply saved on the computer of a relative where I am hanging out right now.


Have fun,

Gryphon
Old 08-04-2008, 07:21 PM
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Default RE: FUNJET

OK Gryphon my PM stuff is functional..............maybe! I thought that glassing it would make it more sleek.... aerodynamic and strong and I read that if you run the glass through to the control surfaces as well it will strengthen the hinge piont and the alevons or ailerator what ever you want to call them. Also for the added torgue to the motor area apply glass to strengthen. Plus you can put a kickin paint job on the fiberglass.

But after this novel I really do not know. Never dun it before etc. What you think?
Old 08-05-2008, 01:14 AM
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Default RE: FUNJET

Slick ... unless you wanna fly her on a 10S set up its unnecessary. You are talking a lot of work and weight but the power set up that you may be using does not need all the mods. I'd leave it as it is and use the CF strips or tubes to make the wings stiffer.
Old 08-05-2008, 07:53 AM
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Default RE: FUNJET

slick
if you really want to make a diff. start on page 2 a look at the pics. and read the text. The simple mods. will make a big diff. It really shows up when you go vert. as the plane will not slow down, due to the fact it's getting a full bite in the air. Lower amp draw>>longer flight time>>more speed>>better handling...what more could you ask for!!!
CP
Old 08-05-2008, 04:59 PM
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Default RE: FUNJET

I guess what you guys are saying is I shouldn't spend the time and effort, and comprimise the weight, to glass this FJ. I have assimilated the info. and it took. So I will buy some carbon instead. Tubes or strips? Which is easier.....better?

Thanks Guys!
Old 08-05-2008, 05:54 PM
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Default RE: FUNJET

I just put all my info on the flyDMa.com caculator and it seems my set up will run at @ 41467 rpm and prop speed of 196.7mph. Is this good. If not it will have to be for a while til the bank allows me to change it!

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