Thekid3418,

you said 28-37-1.5 on 6s. Is that right or do you mean 28-47-1.5 on 6S?

Um...I don't think you should be running a 2800kv motor on 6S, unless you're doing fan & blades or a SMALL prop.

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.

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

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.

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

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

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

which ESC?

amps look normal

Ive got the 150A Eagletree version (with the two Deans connectors).
But - what is a current expander ? Will it work with the 150A ET ?

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

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.

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!

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+.

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.

Um i wouldn't run 4s on that motor, Try to get a 28-47-2.

3s is too much too IMO