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Foamies Talk about building, power setups and anything having to do with e-powered foamy planes!

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Old 04-08-2014, 08:19 PM   #1
abborgogna
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Default Foamy GeeBee

I am currently laying out a foam profile version of the GeeBee R2 for flying at my local park. My question is what is the best spar material for a 36 inch wing span and what is the best way to install it? I have seen everything from laying the spar on the foam and gluing it down to cutting completely through the foam and gluing the spar between the two halves. My guess is it really doesn't make much difference aerodynamically but from a strength and aesthetic point of view it does. Any opinions will be greatly appreciated. By the way I am using 6mil depron for the building material.
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Old 04-08-2014, 08:55 PM   #2
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Originally Posted by abborgogna View Post
I am currently laying out a foam profile version of the GeeBee R2 for flying at my local park. My question is what is the best spar material for a 36 inch wing span and what is the best way to install it? I have seen everything from laying the spar on the foam and gluing it down to cutting completely through the foam and gluing the spar between the two halves. My guess is it really doesn't make much difference aerodynamically but from a strength and aesthetic point of view it does. Any opinions will be greatly appreciated. By the way I am using 6mil depron for the building material.
Hi The best spar material is CF square tube, cut a slot so the 6mm CF lays flush in the wing, use some clear packing tape on one side to cover the hole, spread some 5 min epoxy on the CF, lay it in the cut out grove, then cover it with some clear Packing tape, that will make for a very very stiff and strong spar. you only need one spar brace, in the pic i used 2 braces because this was going to be a very over powered plane.

http://www.rcfoam.com/carbon-fiber-s...ube-p-838.html





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Old 04-08-2014, 09:01 PM   #3
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I painted the wing so you cant see the CF Brace on my scratch built Gee Bee


I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 04-12-2014, 05:33 AM   #4
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Thanks for all the help guys, today I started cutting out the parts. When I get them all cut I will post some pictures. I started with a design that comes from Igor Burger, he is the current world control line aerobatic champion. His design was for indoor C/L aerobatics. I took the basic design and reworked it for R/C. With a little luck it should fly well as a park flyer.
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Old 04-12-2014, 07:16 AM   #5
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I build a lot with 6mm depron.... and CF is not easy to come by where I live.... so I use BBQ bamboo / pine skewers laid into slots, same principle as above.

What I like about using wood.... is there is a limited amount of flex and when they do break - you can in fact glue together again unlike CF which splinters....

Nigel

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Old 04-12-2014, 08:07 AM   #6
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Dang Nigel You must crash your planes Hard I have never crashed a plane and splintered the CF brace on my planes LOL Take care, Chellie

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Old 04-12-2014, 03:58 PM   #7
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MS.Chellie ; Just a note to say Thank You for all the Great information you give out about the Hobby, I went back and checked out all your posts since 08 and really you should write a book . I have learned, so much from all your posts. I sure do hope you write that book about foamies and all your knowledge of all aspects of our hobby. Once again Thank You very much for all you do for the hobby!
All My Best Jerry aka FDNYJERY
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