Thanks very very much Manuel! I've never seen that kind of fury on my test stand before; schtuff was blowing down from the top of my garage cabinets, planes came off their ceiling hooks... it was wild!!!

DT750-10Tx2-21awg-Y
APC 11x7e (29m/18.2C)
8556RPM/13.87V/27.43A/57.4oz/75.4%

That's already 94W heat, so no need to push any further trash my garage with a 1280hd. Efficiency was hanging in there pretty good at 380W though. A 12x6e is only slightly more load than an 11x7e at these RPM's, and that should make well over 60oz. I need to make a trip to my LHS for some more props now that I know this motor is a player. Also need to make something something big enough for this monster. Maybe a 90" 1/4scale slowfly, ROFL!

Kev

I also re-winded motors, used same turns as timocharis on first page of tread.
Motors will be on my tricopter for AP.

Originally Posted by Truglodite

Also need to make something something big enough for this monster. Maybe a 90" 1/4scale slowfly,

Uh oh. "Gotta motor now I gotta make a plane" disease. It's getting serious...

Good to see the results come in positive! Nothing like 4-1/2 pounds of thrust to let you know the test stand is well built.


Dave

Kev.

I have one foamie for your wind. (in construction)

Manuel V.

Wow, that's nice looking work Kristjan. Have you rewound before?


Dave

@Dave
Thanks, I have done it in past. At least ten motors.

Kristjan

Originally Posted by manuel v

Kev.

I have one foamie for your wind. (in construction)

Manuel V.

Now that's what I'm talking about, awesome Manuel!

I was thinking something like that, but out of FFF, since I have a stack of sheets sitting around.

Kev

Now that years of dust and cobwebs, from the top of my garage fluorescent fixtures, has been wiped off my bench:

DT750-10Tx2-21awg-Y
APC12x6e (29m/18.5C)
8370RPM/13.72V/28.73A/68.5oz/82.3%

That's no typo, it's 4.3lb, 394W, 70W heat, 4.9gm/W. That's from Badcock, DCalc SPC says 77.9%, which is 87W heat... right on the money for 1gm/W heat. The dt750 is finally showing it's cards. This foamie is going to have to be much bigger than I thought, LOL!

Kev

4.925 Watts /g for tork motor.

At this level of power, I would not trust the motor base.,
question would probably be to change the arrow and different engine mount.

Starting to look like a power motor more than a torque motor, isn't it?

Yeah, I was thinking the same thing, and those bearings won't last long at WOT, that's if the e-clip didn't pop off first.

Mounting it like that would take lots of load off the front bearing. I could just grind a new e-clip slot and flat spot for the grub screw on the stock shaft. So changing the shaft wouldn't be absolutely necessary; although I do hate the stupid threads.

Although, it would be cool to stick with the typical 3D foamy method so it looks just like a scaled up version. To do that I could just use a 4mm collet on the rear with the appropriate flat spots ground on the stock shaft.

Kev

Just reran my 1280HD with timing set to high. These are the numbers after the motor had been running about 1 minute.

GWS 1280HD
Volts: 14.71
Amps: 20.1
Watts: 292
RPM: 6518

I also took a temp reading after the motor was shut down. Highest reading was 204F.

95C... that is waaay too hot.... you'll demag it if you keep that up.

Originally Posted by Dr Kiwi

95C... that is waaay too hot.... you'll demag it if you keep that up.

Yeah I think the 1280HD is way too much prop at this kv on 4S.

Those 1260 HDs would probably be great. Only place I've seen 'em is United Hobby City King though.


Dave

http://www.caliberhobby.com/propellers_reg.html [in 6-packs though]