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Author Topic: Plane for Cobra 2826/10 and /12  (Read 1534 times)

Offline Matt Piatkowski

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Plane for Cobra 2826/10 and /12
« on: October 04, 2015, 04:36:32 AM »
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
 

Offline Joseph Daly

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Re: Plane for Cobra 2826/10 and /12
« Reply #1 on: October 04, 2015, 07:17:27 AM »
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

Offline Joe Yau

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Re: Plane for Cobra 2826/10 and /12
« Reply #2 on: October 18, 2015, 10:18:27 AM »
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 :)

Offline Tim Wescott

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Re: Plane for Cobra 2826/10 and /12
« Reply #3 on: October 18, 2015, 11:33:55 AM »
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.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.


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