SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Closed Thread
Thread Tools
Old Jan 08, 2009, 03:19 AM
Registered User
GryphonRCU's Avatar
United States, CA, SF
Joined Mar 2008
3,872 Posts
Thekid3418,

you said 28-37-1.5 on 6s. Is that right or do you mean 28-47-1.5 on 6S?
GryphonRCU is offline Find More Posts by GryphonRCU
Sign up now
to remove ads between posts
Old Jan 08, 2009, 04:11 AM
Registered User
USA, CA, San Diego
Joined Jan 2008
651 Posts
Um...I don't think you should be running a 2800kv motor on 6S, unless you're doing fan & blades or a SMALL prop.
hawkz is online now Find More Posts by hawkz
Old Jan 08, 2009, 06:41 AM
zoom zoom
gotboostedvr6's Avatar
USA, NJ, Mt Laurel
Joined Oct 2007
3,691 Posts
Numb used the 47mm motor on 6s with a small prop at around 2000 watts. not an ideal setup but it went 155 or so.
gotboostedvr6 is offline Find More Posts by gotboostedvr6
Old Jan 08, 2009, 07:42 AM
www.gobrushless.com
North Carolina
Joined Jan 2005
1,564 Posts
Quote:
Originally Posted by gotboostedvr6
Dan,

What is the resistance of this 2535kv motor? and the 2800 kv model?
calculated resistance based on standard copper wire resistance and wire length; .067 and .063 respectively.
my meter reads .03
i do not have the expensive instruments needed to measure low resistance accurately.
Dan
Micro Dan is offline Find More Posts by Micro Dan
Old Jan 08, 2009, 08:57 AM
Registered User
Joined Oct 2008
490 Posts
Fj Rip

I crashed. Badly. Nothing survived except motor and Eagletree. I was using NEU 1509/1Y with a 6X4 Sport. Pulled 110A on launch. I think I fried my turnigy 80A/90A esc (yeah - I know, serves me right)
When I play the flight back it shows throttle fluctuations and then Amps going to almost zero (volts stayed OK). Airspeed meter showed impact at 91mph

Ive ordered a new FJ, NEU 3S 5000mah and CC125. I plan to run it with a 6.5X6.5 and a WOT of 170A and around 2000W. This set-up is testing for a carbon speed plane Im scratch building but should make for a very F FJ.

Long term set-up will go back to MR 028-056-2800 with 3S 5000mah, 6.5X6.5 and around 120A - 1300kW. This is what I was using prior to using the NEU. Awesome torque and speed. I swear by a larger prop for the FJ.
War Machine is offline Find More Posts by War Machine
Old Jan 08, 2009, 12:47 PM
Registered User
elfwreck's Avatar
United States, CA, Oakland
Joined Dec 2002
2,352 Posts
Hey now,
Having played with a lot of pylon type and other high-pro models I generally swear at, not by larger dish props. The exception is F5B/hot liners.
Running the right combination of cells and motor I get as much if not more speed than folks using bigger props and I get a lot less launch torque with my small dish props.

The lag between letting go of the model and getting my hand on the stick is long enough that the torque roll effect can be disasterous.
My FJ runing a 5.2sq prop launches flat and gets on step plenty quick. Same with my Arriane P-5, Avionik D99, and Valenta Flash. The exception to this is my little HET Yak 1. Doesn't matter what prop I use it torques hard to the left on every launch. So these days I bungee it, still rolls, but with my hand on the stick it isn't too bad.

Now my Frankenstein hot liner, Avocet sloper wing, home built fuse and tail, torques out real bad, but then it's got a hot Hacker B-40 7L, 4.4:1 gear box and 14-9.5 RF folder on 5S TPX 3300s. You kind of expect it to torque out on launch, even at half throttle...

Of course this is all personal choice and limits of ability. If you're up for dealing with the launch torque, well by all means, do it up.

RobII
elfwreck is offline Find More Posts by elfwreck
Old Jan 08, 2009, 01:38 PM
The Kid
Thekid3418's Avatar
Detroit, MI
Joined Dec 2007
2,587 Posts
Yes gryphon, i ment the 47-1.5

War Machine, Do you have a current expander on your eagletree? Because im pretty sure they are only rated for 75 amps or something like that. So thats another part of your system you may want to look at when running such a high current system
Thekid3418 is offline Find More Posts by Thekid3418
Old Jan 08, 2009, 11:57 PM
They call me Supercrash
OBX NC
Joined Sep 2008
330 Posts
I just got my order from HC in and did some quick testing. Tried 3 props. I got a Turnigy temp gauge and most of the time the motor was around 130's F. What is too hot? I also noticed if I was slow on the throttle stick the motor would turn, then seize. If I immediately started out at half it was fine, Any ideas? i realize its cheap stuff but would like to have an idea.

My setup was 3s Zippy (11.5v at testing) 50A ESC 3000kv motor.

4.5x4.5 APC- 40A @410W

5.5x4.5 APC- 50A @510W

4.5x4.5 Graupner- 41A @405W

Thanks in advance
Erroet is offline Find More Posts by Erroet
Old Jan 09, 2009, 12:05 AM
zoom zoom
gotboostedvr6's Avatar
USA, NJ, Mt Laurel
Joined Oct 2007
3,691 Posts
which ESC?

amps look normal
gotboostedvr6 is offline Find More Posts by gotboostedvr6
Old Jan 09, 2009, 12:55 AM
Registered User
Joined Oct 2008
490 Posts
Ive got the 150A Eagletree version (with the two Deans connectors).
But - what is a current expander ? Will it work with the 150A ET ?


Quote:
Originally Posted by Thekid3418
Yes gryphon, i ment the 47-1.5

War Machine, Do you have a current expander on your eagletree? Because im pretty sure they are only rated for 75 amps or something like that. So thats another part of your system you may want to look at when running such a high current system
War Machine is offline Find More Posts by War Machine
Old Jan 09, 2009, 11:40 AM
Registered User
Xnaron's Avatar
Joined Feb 2003
3,759 Posts
Quote:
Originally Posted by Erroet
I just got my order from HC in and did some quick testing. Tried 3 props. I got a Turnigy temp gauge and most of the time the motor was around 130's F. What is too hot? I also noticed if I was slow on the throttle stick the motor would turn, then seize. If I immediately started out at half it was fine, Any ideas? i realize its cheap stuff but would like to have an idea.

My setup was 3s Zippy (11.5v at testing) 50A ESC 3000kv motor.

4.5x4.5 APC- 40A @410W

5.5x4.5 APC- 50A @510W

4.5x4.5 Graupner- 41A @405W

Thanks in advance
temperature is fine...try setting different timings on your esc to see if you can get rid of the start up stutter.
Xnaron is offline Find More Posts by Xnaron
Old Jan 11, 2009, 09:51 PM
Ook!
skaffen's Avatar
New Zealand
Joined Aug 2007
1,496 Posts
Hi guys

Can anyone suggest a prop for my FJ? I'm running a ARC 28-37-2 on 4S 2350 mAh batts with a 60A ESC.

My watt meter hasn't arrived yet, and I'm dying to get this bird airborne, I've got gottafly fever!
skaffen is offline Find More Posts by skaffen
Old Jan 11, 2009, 10:04 PM
Registered User
Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,206 Posts
Quote:
Originally Posted by skaffen
Hi guys

Can anyone suggest a prop for my FJ? I'm running a ARC 28-37-2 on 4S 2350 mAh batts with a 60A ESC.

My watt meter hasn't arrived yet, and I'm dying to get this bird airborne, I've got gottafly fever!
Do you intend to stick within the specs for the motor or go for broke?

With just a 4.1x4.1 APC E @ 11v, my 28-37-2 drew 33.2A/363W which is well above the 35A/300W max suggested by www.lightflightrc.com. Unless you go to a 3" toothpick prop, on 4s you'll be pushing 40A-45A and 550W+.
Dr Kiwi is offline Find More Posts by Dr Kiwi
Old Jan 11, 2009, 10:05 PM
Gone Flying.
ChrisWNY's Avatar
Western NY
Joined Nov 2006
2,401 Posts
Quote:
Originally Posted by skaffen
Hi guys

Can anyone suggest a prop for my FJ? I'm running a ARC 28-37-2 on 4S 2350 mAh batts with a 60A ESC.

My watt meter hasn't arrived yet, and I'm dying to get this bird airborne, I've got gottafly fever!
Start off with a 5x4.5, 4.5x4, 4.1x4.1, or 4.75x4.5 APC (or Graupner CAM Speed prop), something around (4" diameter and pitch would be the best start) that size since you're dealing with a hot wind motor designed to spin a smaller prop at high RPMs. That should keep the Amp consumption under control. The 5.5x4.5 would really push the Amp limits. As Dr. Kiwi already mentioned, the motor is rated for 35 Amps, best to stay within spec.

I run a 28-37-2.5 ARC on one of my FunJets on a 4.5x4.5 Graupner CAM speed prop, and it draws over 40 Amps WOT on 3S. Your motor will draw even more current on a 3S with the same size prop.
ChrisWNY is offline Find More Posts by ChrisWNY
Old Jan 11, 2009, 10:07 PM
zoom zoom
gotboostedvr6's Avatar
USA, NJ, Mt Laurel
Joined Oct 2007
3,691 Posts
Um i wouldn't run 4s on that motor, Try to get a 28-47-2.

3s is too much too IMO
gotboostedvr6 is offline Find More Posts by gotboostedvr6
Closed Thread


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Wanted Multiplex funjet ouluckydogu Aircraft - Electric - Jets (FS/W) 7 Jul 24, 2006 05:01 PM
Sold Multiplex Funjet NIB bruff Aircraft - Electric - Airplanes (FS/W) 4 Jul 06, 2006 05:46 PM
Video Multiplex FunJet - Full video (20 MB) Jeremy Z Electric Plane Talk 0 Jun 28, 2006 02:27 AM
Video Multiplex FunJET Indoor Jurgen Heilig Electric Plane Talk 2 May 01, 2006 07:31 AM