stunthanger.com
Electric Stunt => Gettin all AMP'ed up! => Topic started by: Matt Piatkowski on October 04, 2015, 04:36:32 AM
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Hello,
I am sizing the model for these motors: wings span, area, moments, tail configuration etc.
David Felinczak uses 2820 in his Legacy but he wrote that this plane was "heavy at 58.1 oz."
Cobra 2826/10 and/12 are a little more powerful than 2820/12 or/14 so the plane of Legacy size weighting, say, 54 oz. should fly well, I suppose.
As usually, I would be grateful for your suggestions and comments.
Regards,
Matt
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Matt,
The 28 series cobra are good motor, however they tend to run on the hot side when in a full fuse. I have found that the 35 series run cooler in full fuses and do not weight much more. I have used a 3515 on my rounder, which weights about 55ozs and has no issue pulling that plane and would easily pull a 60 oz plane with no issue. The motor runs a warmer then ambient even on really warm days. They also have 3 large bearing in them. The only draw back is they are wide, other then that it is a really strong motor.
Joe
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Hi Matt,
On my new Electric Legacy (weights 62.5oz w batt). It has an E-flite 32 on it, but after about 9 flights, it went bad (had bearing issue then burned up something inside) so I replaced with a Cobra 2826-12. using Igor's 11x5 3-blade on it. The setup with the changes was near 2 oz lighter then the previous with .4oz tail weight removed. I liked it better as it turns better. But it got a bit toasty.. had a temp reading of 182F degree :o just after a flight. so I end up replacing it with another 32. I would think something like a Vector 40 to maybe an Oriental Plus (600sq in) should be fine with the Cobra 2826-12 :)
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We really need more college- and high-school-age people in the group. I suspect that our knowledge of how to cool motors properly is exceedingly primitive, and a nice thorough study of how to implement good motor cooling in a stunter should make a good senior project for a college kid, or a dynamite science fair project for a high-schooler.
If anyone knows of published results I'd be interested.