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Old May 31, 2001, 09:52 PM
Rhinebeck CD-99,00,01,02
Tom Smith's Avatar
New Bern, NC
Joined Mar 2001
3,079 Posts
Question about Astro 15 geared motor ?

I just swapped a friend an airplane for an Astro Cobalt 15G. It has a sticker on it that says 11T. I know that means it is an 11 turn motor but the Astro web site shows a 10T for the 15. This motor and box is brand new and I am sure it will be fine, but could anyone explain the difference. Example, why did they go to a 10 turn motor. Is it better. I am pretty well versed with the s400 and smaller can motors but when it comes to the # of winds and timing and all that I am lost. I plan to put this setup in a Gee Bee models Tiger Moth. It was originally to be 25 ic powered but will never see that setup. It has a wingspan of 48" with 650 sq in wing area and ic powered is supposed to weigh 4 to 4.5 lbs. I will build it lighter for sure. I have a 12 cell ncd pack for it and wish to swing an 11 or 12" prop. Slow scale flight is my cup of tea. Thanks for any light you can shed on this matter. Please don't get to techinical. It will go over my head in a flash. Please, keep it simple ! Tom Smith
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Old May 31, 2001, 10:28 PM
Registered User
Santa Rosa, Northern CA, USA
Joined Oct 1999
2,472 Posts
Tom,

Just ignore the 11T, and act like its a 10T.
That is pretty simple, and you will be just fine, really.

Slightly more technical would be the motor has a few less rpm, but more torque. This means you can use a slightly larger prop, or one more cell, vs the 10T.

The 11T motor is nice, I have one too!

Dave

BTW: The Astro 05 is the same motor as the Astro 15, except it comes with 7, 6, and 5 turns.

[This message has been edited by Daveairway (edited 05-31-2001).]
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Old May 31, 2001, 11:26 PM
Rhinebeck CD-99,00,01,02
Tom Smith's Avatar
New Bern, NC
Joined Mar 2001
3,079 Posts
Thanks D. It is reassuring to hear that I didn't get stiffed. That is just what I was looking for. Being able to swing a 12" prop at scale speeds for scale flight realism. Thanks again for the simple answer. You hit the nail right on the head. Tom
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