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Old Mar 05, 2010, 12:34 AM
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Truglodite's Avatar
Carmichael, CA
Joined Feb 2007
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Holy Hurricanes, 57oz!!! Manuel was spot on!

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
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Old Mar 05, 2010, 02:07 AM
Have a nice day! Kristjan
kristjane's Avatar
Slovenia, Novo mesto, Šentjernej
Joined Jan 2006
774 Posts
I also re-winded motors, used same turns as timocharis on first page of tread.
Motors will be on my tricopter for AP.
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Old Mar 05, 2010, 10:37 AM
Dave North
timocharis's Avatar
USA, CA, San Jose
Joined Apr 2004
5,254 Posts
Quote:
Originally Posted by Truglodite View Post
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
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Old Mar 05, 2010, 11:00 AM
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manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
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Kev.

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

Manuel V.
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Old Mar 05, 2010, 11:10 AM
Dave North
timocharis's Avatar
USA, CA, San Jose
Joined Apr 2004
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Wow, that's nice looking work Kristjan. Have you rewound before?


Dave
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Old Mar 05, 2010, 12:09 PM
Have a nice day! Kristjan
kristjane's Avatar
Slovenia, Novo mesto, Šentjernej
Joined Jan 2006
774 Posts
@Dave
Thanks, I have done it in past. At least ten motors.

Kristjan
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Old Mar 05, 2010, 08:17 PM
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Truglodite's Avatar
Carmichael, CA
Joined Feb 2007
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Quote:
Originally Posted by manuel v View Post
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
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Old Mar 06, 2010, 01:24 AM
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Truglodite's Avatar
Carmichael, CA
Joined Feb 2007
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Don't need to dust my garage now...

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
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Old Mar 06, 2010, 02:23 AM
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manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
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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.
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Last edited by manuel v; Mar 06, 2010 at 02:36 AM.
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Old Mar 06, 2010, 03:28 AM
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Truglodite's Avatar
Carmichael, CA
Joined Feb 2007
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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
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Old Mar 06, 2010, 11:02 AM
I make bad look so good.
SteveC68's Avatar
League City, Texas
Joined Sep 2006
2,512 Posts
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.
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Old Mar 06, 2010, 11:16 AM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
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95C... that is waaay too hot.... you'll demag it if you keep that up.
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Old Mar 06, 2010, 11:57 AM
I make bad look so good.
SteveC68's Avatar
League City, Texas
Joined Sep 2006
2,512 Posts
Quote:
Originally Posted by Dr Kiwi View Post
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.
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Old Mar 06, 2010, 12:29 PM
Dave North
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USA, CA, San Jose
Joined Apr 2004
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Those 1260 HDs would probably be great. Only place I've seen 'em is United Hobby City King though.


Dave
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Old Mar 06, 2010, 01:03 PM
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Chattanooga, Tennessee, United States
Joined May 2003
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http://www.caliberhobby.com/propellers_reg.html [in 6-packs though]
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