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  #1  
Old 01-04-2019, 02:53 PM
BigRIJoe BigRIJoe is offline
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Default Any Boost Glider Plans or Kits Using 1/4 Inch Thick Wings ?

I have two sheets of pre-airfoiled balsa from SIG. They are each 1/4 inch thick. One is 4 inches wide and the other is 3 inches wide. I'd like to build a glider from plans using the balsa or make a copy of the wing from a kit using the pre-airfoiled balsa
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Old 01-04-2019, 03:29 PM
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ghrocketman ghrocketman is offline
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Sounds wayyyyyyyy too heavy/thick for boost gliders.
Model aircraft use only.
Probably hard/dense balsa too, making it even worse.
That stuff is not for making wings; it is aileron stock for fun-fly type R/C aircraft.
Bet it has a fully symmetrical airfoil.
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Old 01-04-2019, 07:08 PM
astronwolf astronwolf is offline
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I built one of these using 1/4" thick balsa for C rocket glider. It worked very well, and eventually it thermalled away.
https://www.nar.org/wp-content/uplo...R-G-Vincent.pdf

For best performance Jeff's recommended balsa density should be used, but I wouldn't let that stop you if your balsa is a little denser.
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Old 01-04-2019, 07:57 PM
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BEC BEC is offline
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Quote:
Originally Posted by ghrocketman
Sounds wayyyyyyyy too heavy/thick for boost gliders.
Model aircraft use only.
Probably hard/dense balsa too, making it even worse.
That stuff is not for making wings; it is aileron stock for fun-fly type R/C aircraft.
Bet it has a fully symmetrical airfoil.


Those 3 and 4 inch wide pre-airfoiled sheets from Sig are not aileron stock but have a simple flat-bottomed airfoil. They come in 3/16 and 1/4 inch thick x 3 x 36 inch pieces and 1/4 x 4 x 36 as well. Probably medium density (it's been years since I've actually seen one in person). I figured they were long gone, but it turns out they are still available: https://sigmfg.com/collections/sig-...=12305562959950

Too heavy for boost gliders - maybe.
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Old 01-04-2019, 10:15 PM
astronwolf astronwolf is offline
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Quote:
Originally Posted by BEC
Too heavy for boost gliders - maybe.

My guess too... but you never know.
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Old 02-25-2019, 07:18 PM
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Ez2cDave Ez2cDave is offline
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Quote:
Originally Posted by BigRIJoe
I have two sheets of pre-airfoiled balsa from SIG. They are each 1/4 inch thick. One is 4 inches wide and the other is 3 inches wide. I'd like to build a glider from plans using the balsa or make a copy of the wing from a kit using the pre-airfoiled balsa


Here is one . . . The "EASY RIDER IV" , from March, 1975.

1/4" Balsa . . . For D12 motors !

Dave F.
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Old 02-25-2019, 08:55 PM
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ghrocketman ghrocketman is offline
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Regarding that above design, back during that era it was common for hobby shops to carry 4 and even 5 grades of Balsa- Soft, Medium, Hard, C-grain, and Contest (lightest).
Good luck with that nowadays...most all is too dense/hard in 1/4" thickness at hobby shops.
One would have to order specialty balsa thru a supplier or it most likely would glide like a manhole cover.
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Old 02-25-2019, 09:17 PM
astronwolf astronwolf is offline
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Quote:
Originally Posted by ghrocketman
Good luck with that nowadays...most all is too dense/hard in 1/4" thickness at hobby shops.
One would have to order specialty balsa thru a supplier or it most likely would glide like a manhole cover.

Negative Nelly hard at work...

When I want to stock up on balsa, I take my digital scale and sweep through all the local crafts stores and I usually come away with some choice pieces of balsa. You can find some pretty good wood this way. Or you can order from SIG.
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  #10  
Old 02-26-2019, 05:44 AM
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Jerry Irvine Jerry Irvine is offline
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Okay I will do something radical and post an on-topic response.

http://v-serv.com/crp/CRm/1-82/CRm.1-82.19.w.jpg

http://v-serv.com/crp/CRm/7-81/CRm.7-81.17.w.jpg
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