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Old 09-21-2014, 09:11 PM
Heli Hacker Heli Hacker is offline
mechg
 
Join Date: Nov 2008
Posts: 14
Default Rocket Glider from Thermic 20

Did anyone else build a rocket glider from the Thermic 20 ?

http://www.google.com/imgres?imgurl...start=0&ndsp=20
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Old 09-21-2014, 10:12 PM
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Jerry Irvine Jerry Irvine is offline
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Yes but I think it was about 1970! Boost gliders are best with slightly less wing span or area or with lower thrust motors. However Estes motors of the time had a high thrust initial slug. The closest motor was the B4, but that had one too.

That said, stick one on the side of a Saturn V which flies slow anyway and you have something (weird).

Jerry
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Old 09-22-2014, 05:24 AM
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GuyNoir GuyNoir is offline
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I've built a bunch of these. I used polyhedral wings, not dihedral, and you obviously have to put the rudder on the bottom to clear the exhaust. Otherwise, they were stock. They fly fine on a B4-2.

If you got with a C6-3, they'll need strengthening with a more robust boom (spruce), denser balsa and tissue or silkspan covering.
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Old 09-22-2014, 10:27 AM
Heli Hacker Heli Hacker is offline
mechg
 
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Yeah, it was around '71 or '72 when I built one as a dihedral. On a B motor it stayed aloft for a couple of minutes.
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Old 09-22-2014, 02:00 PM
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Questor Questor is offline
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Model Rocketry magazine Jan/Feb 1972 had a article about usng a Thermic 18 as a b/g.
http://www.ninfinger.org/rockets/Mo..._(01-02)-72.pdf
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  #6  
Old 09-22-2014, 03:37 PM
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Jerry Irvine Jerry Irvine is offline
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I just find it notable Guy (MB) and Jerry have something in common!

Quote:
Originally Posted by GuyNoir
have to put the rudder on the bottom to clear the exhaust
Unless you are just fine indeed with blast damage!
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