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Old Jul 29, 2010, 05:22 PM
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United States, AK, Anchorage
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Sorry Jurgen I meant to say that IT DID put down roughly the same numbers that you mentioned on the above setup. For someone just getting into FJ's I think its a great setup. The motor, battery and ESC all came down cool unlike my 3700kv setup. Motor and battery come down hot.
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Old Jul 29, 2010, 05:34 PM
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United States, AK, Anchorage
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Im sure ive posted the stats of my new funjet build, but now that its almost done I guess Ill show it while its still in one piece

Couple of things ive done to it:

Carbon spar
Extra carbon in wings and on trailing edge of elevons
Carbon Square spar down the full length of fuseloge
Arc 28 47-1.5 w/Heatsink
Turnigy 3000 40c 4c
100a CC Ice lite
18g Digital MG servos
Hatch lock in the middle and front to keep it together at higher speeds
A some duck tape here and there to make it more ridgid and stain resistant

Anyways all im waiting for are my APC props to come in, a nice day, and some courage to throw this heavy monster.

O I plan on using velcro on the bottom of the battery to hold it in. On my other FJ thats all thats needed to hold the battery in. Im wondering if I should ca some velcro battery straps in place just to be sure.
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Old Jul 29, 2010, 07:24 PM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
4,975 Posts
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Originally Posted by yellowcolorado View Post
and some courage to throw this heavy monster.
The lizzard ????
Are you crazy ???
DONT throw him, throw the FJ instead !!!!!
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Old Jul 29, 2010, 07:30 PM
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Joined Aug 2007
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here is how NOT to throw a jet
ParkZone Habu EDF BNF JET CRASH (0 min 55 sec)
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Old Jul 29, 2010, 10:39 PM
The "Foaminator"
mikeruth's Avatar
United States, CA, Los Angeles
Joined Mar 2007
2,111 Posts
Quote:
Originally Posted by yellowcolorado View Post
Im sure ive posted the stats of my new funjet build, but now that its almost done I guess Ill show it while its still in one piece

Couple of things ive done to it:

Carbon spar
Extra carbon in wings and on trailing edge of elevons
Carbon Square spar down the full length of fuseloge
Arc 28 47-1.5 w/Heatsink
Turnigy 3000 40c 4c
100a CC Ice lite
18g Digital MG servos
Hatch lock in the middle and front to keep it together at higher speeds
A some duck tape here and there to make it more ridgid and stain resistant

Anyways all im waiting for are my APC props to come in, a nice day, and some courage to throw this heavy monster.

O I plan on using velcro on the bottom of the battery to hold it in. On my other FJ thats all thats needed to hold the battery in. Im wondering if I should ca some velcro battery straps in place just to be sure.
Absolutely use a strap on the battery, you did good on making that canopy hang on tighter but I gaurantee if it comes off for any reason your pack will eject too, don;t ask how I know
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Old Jul 30, 2010, 01:59 AM
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Greece
Joined Jun 2007
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Originally Posted by yellowcolorado View Post
...I plan on using velcro on the bottom of the battery to hold it in...
using velcro to hold the battery is reallyy leallllyyy scary for me . This is what i do..


At the next photo i use a heatsink to help battery stay cool.


And this was my glassed beauty. Planning to paint my new one like this
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Last edited by petranf; Jul 30, 2010 at 02:05 AM.
Old Jul 30, 2010, 04:15 AM
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United States, WI, Evansville
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Originally Posted by Waverunner View Post
I am running a 3900 kv Turnigy and a 60 amp e flight speed control. I need to know the best prop to use for a three cell and a four cell set up.

Thank you,

Waverunner
Hello waverunner, I have the same motor and was planning to put it on my newly acquired FJ. The problem is that it wont take a prop greater than 4.5 x 4.1 or at the most 5x3. Have you put it on FJ? what are your results?
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Old Jul 30, 2010, 07:30 AM
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Originally Posted by Thekid3418 View Post
For the same price you can get the 2845 motors, which i would recommend just because they'll take a little more power. I have two of the 2845-2700 and i like them a lot! I think they would handle a 6x4 very well at about 45 amps on 3s. It would work perfectly with a 40 amp controller and net you some pretty high speeds (maybe in the 90's). That said i would get the 60 controller as it will give you much more flexability later on when you want to go faster, and i promise, you WILL want to go faster
Hi Nick, I am planning to go for the same motor. Did you go in for it for used 2835. Pl post your results.
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Old Jul 30, 2010, 07:40 AM
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How would be a HXT 2835-2700 with a 6 x 4 or 5 x 5.5 prop? What would give me a better flight - 4S or 3S with this?
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Old Jul 30, 2010, 08:16 AM
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Originally Posted by parambir View Post
In that case I guess 7x6 may be recommended. What sort of torque fight will I have to handle. ...
Let's say you have two motors producing 400W each. One spins a 5" inch prop at 20.000rpm, the other a 7" prop at 10.000rpm. With both motors having the same power, the torque on the lower revving motor is twice as high.

Jürgen
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Old Jul 30, 2010, 08:17 AM
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Originally Posted by parambir View Post
How would be a HXT 2835-2700 with a 6 x 4 or 5 x 5.5 prop? What would give me a better flight - 4S or 3S with this?
The HXT2835-2700 will give you a mild setup for 3s with a 5.5x4.5" prop. It won't survive 4s for long.

Jürgen
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Old Jul 30, 2010, 12:11 PM
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Originally Posted by Jurgen Heilig View Post
The HXT2835-2700 will give you a mild setup for 3s with a 5.5x4.5" prop. It won't survive 4s for long.

Jürgen
Ok so what do you feel about Turnigy 2836 brushless Outrunner 2350kv.
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Old Jul 30, 2010, 12:27 PM
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Originally Posted by parambir View Post
Ok so what do you feel about Turnigy 2836 brushless Outrunner 2350kv.
OK for 4s or the 3200kv version for 3s.

Jürgen
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Old Jul 30, 2010, 12:37 PM
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Originally Posted by Jurgen Heilig View Post
OK for 4s or the 3200kv version for 3s.

Jürgen
Phew

Atlast you agreed to something. You have been seeing I am looking for a motor for FJ for a long time now. With so many views out there, things can get foggy. Ok so we settle for 2836 - 2350. Now what prop do you recommend for 4S and if I run it at 3S. Also what speeds of FJ should I be expecting?
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Old Jul 30, 2010, 12:49 PM
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Originally Posted by Jurgen Heilig View Post
For those who are looking for a cheap drive set:

Hextronik 36A ESC plus Turnigy H2223-2900kV outrunner.

Measured performance:

No load: 12.2V 3.42A

With Cam Speed 5.5x4.3":

10.37V - 37.75A - 391.5W - 22848rpm (about 65% total efficiency)

For even more power, use a better than 20C/2100mAh battery and a higher rated ESC.

Jürgen
Ok, just a short test with a 3s/2200 30C battery:

11.54V - 44.88A - 517.9W - 24832rpm (approx. 102mph pitch speed).

And just for comparision to show what a better setup can do with that battery:

Kontronik BEAT 40-6-12, Hopf Viper Boridium 420/2 (similar to a MEGA 16/15/3)

11.35V - 45.57A - 517.2W - 26694rpm (approx. 109.5mph pitch speed)

26694rpm takes approx. 25% more power than spinning the prop at 24832rpm.

That's the kind of difference you can expect between a 65% efficient drive system and an 81% efficient setup. Same input power, but the difference in output power becomes very noticeable.

Jürgen
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Last edited by Jurgen Heilig; Jul 31, 2010 at 06:14 AM. Reason: more test data added
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