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-   -   Any Boost Glider Plans or Kits Using 1/4 Inch Thick Wings ? (http://www.oldrocketforum.com/showthread.php?t=17669)

BigRIJoe 01-04-2019 02:53 PM

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

ghrocketman 01-04-2019 03:29 PM

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.

astronwolf 01-04-2019 07:08 PM

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.

BEC 01-04-2019 07:57 PM

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.

astronwolf 01-04-2019 10:15 PM

Quote:
Originally Posted by BEC
Too heavy for boost gliders - maybe.

My guess too... but you never know.

Ez2cDave 02-25-2019 07:18 PM

1 Attachment(s)
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.

ghrocketman 02-25-2019 08:55 PM

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.

astronwolf 02-25-2019 09:17 PM

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.

:rolleyes: 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.

Ez2cDave 02-25-2019 09:36 PM

1 Attachment(s)
http://www.modelaviation.com/balsa

http://www.modelaviation.com/images...lsa-density.pdf

https://sigmfg.com/collections/specialty-balsa

https://sigmfg.com/products/sigb454...36-contest-wood

http://www.specializedbalsa.com/pro...alsa_sheets.php

https://www.nationalbalsa.com/Aero_..._p/116348ct.htm


Jerry Irvine 02-26-2019 05:44 AM

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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