Balsa Sheeting Question
What is the standard thickness of balsa sheeting used for most standard 40-60 and 60-90 size ARFs, fuselage, wings, etc.? I notice some different thicknesses but was wondering what is pretty much standard across the board.
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RE: Balsa Sheeting Question
Determining a standard for all planes from 40 to 90 is a bit impossibl;e since s o much depends on type construction being used.
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RE: Balsa Sheeting Question
Tedmo hit the nail right on the head. How and where the sheeting will go has a lot to do with the thickness of the sheeting. I had one kit that had 3/32" sheeting that had to be wetted to apply on the turtledeck. The wood was hard and when it started drying out I heard a large "POW" behind me. The wood actually split violently as it dried back out. I removed the 3/32" and resheeted with a softer 1/16" sheet with much better results.
Let us know what application you are talking about and it'll be possible to give a better answer. Ken |
RE: Balsa Sheeting Question
Thanks for the responses. I have repaired a stick built Stik and a couple ARFs and I always seem to have what balsa I don't need on the shelf. One of the planes I repaired was an AeroWorks Extra 260 QB and it seemed to have 3/32 balsa sheeting on the wings, but I did not really measure it...just guessing.
What are wings normally covered with? Or does it just depends on the manufacter of the plane? I plan to order some more balsa sheeting and wanted the bulk of it to be standard so it would not be just keeping the shelf occupied when I do repairs. |
RE: Balsa Sheeting Question
1/16" and 3/32" sheet balsa are probably the most popular sizes. 1/16" is used on lighter smaller planes, but can be very tender when handling the plane as it's easy to put a finger through it. 3/32" is a bit more sturdy but adds weight.
Ken |
RE: Balsa Sheeting Question
The ARF wings are covered in Monokote, Ultracoat and a varied amount of other coverings, once again depending on who made it. Some of them have a stick on covering like shelf paper. As for sheeting sizes, I would stock 1/16 and 3/32 for the bulk of it and maybe some 1/8. Most wings in the 40 to 60 size range use that thickness sheeting. Good Luck, Dave
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RE: Balsa Sheeting Question
ORIGINAL: DavidAgar The ARF wings are covered in Monokote, Ultracoat and a varied amount of other coverings, once again depending on who made it. Some of them have a stick on covering like shelf paper. As for sheeting sizes, I would stock 1/16 and 3/32 for the bulk of it and maybe some 1/8. Most wings in the 40 to 60 size range use that thickness sheeting. Good Luck, Dave |
RE: Balsa Sheeting Question
ORIGINAL: Gray Beard ORIGINAL: DavidAgar The ARF wings are covered in Monokote, Ultracoat and a varied amount of other coverings, once again depending on who made it. Some of them have a stick on covering like shelf paper. As for sheeting sizes, I would stock 1/16 and 3/32 for the bulk of it and maybe some 1/8. Most wings in the 40 to 60 size range use that thickness sheeting. Good Luck, Dave |
RE: Balsa Sheeting Question
Contest Grade Balsa is wood that weighs in at 4 to 6 lbs per cubic foot.
It's quite soft, very light, more money and it's getting harder and harder to come by these days. |
RE: Balsa Sheeting Question
4 to 6 pound wood is practically a myth. But you can find, with some effort, good wood in the 6 to 8 pound range for wing skins and general building. Even at this weight, grain selection is important for sheeting that needs to bend. "A-grain" wood is very flexible, while "C-grain" is very stiff. Here is a link to what Sig has on the subject:
http://www.imperialrcclub.com/pdf/Mi...ood%200205.pdf While balsa can be very dense, I seldom use anything above 12 lb stock and only very limited amounts in high stress areas. That's what birch aircraft plywood and spruce are for. |
RE: Balsa Sheeting Question
Thanks for the very good info. I definitely will research this subject more intensely now. If a minimum amount of additional cash for better grade balsa can make a plane stronger, then to me that is a good area to invest in.
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RE: Balsa Sheeting Question
3/32 turns out to be the most useful but the suggestions on having 1/16 and 1/8 for certain applications are right on. Contest grade is hard to find, does ding a little easily but is an absolute pleasure to work with. If you get stuck with a rock hard piece of heavy balsa either throw it away or save it for a special use. I too have used both BUSA and Lone Star and although I've had some minor disappointments they try hard and are pretty good. Wish they would find something other than balsa to fill those giant wind turbine blades with. Heck, one blades' worth is enough balsa for one average modelers lifetime!
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RE: Balsa Sheeting Question
ORIGINAL: Augie11 3/32 turns out to be the most useful but the suggestions on having 1/16 and 1/8 for certain applications are right on. Contest grade is hard to find, does ding a little easily but is an absolute pleasure to work with. If you get stuck with a rock hard piece of heavy balsa either throw it away or save it for a special use. I too have used both BUSA and Lone Star and although I've had some minor disappointments they try hard and are pretty good. Wish they would find something other than balsa to fill those giant wind turbine blades with. Heck, one blades' worth is enough balsa for one average modelers lifetime! |
RE: Balsa Sheeting Question
I have used 1/32" sheeting successfully on framed wings as a part of an integrated structural design when I intended to cover the wing with a traditional doped silk/silkspan type covering. With a Nitrate dope prep and the covering fused down to the sheeting, the net result winds up being about as sturdy structurally in the air as 1/16 or 3/32 covered with plastics.
Obviously, such an integrated design depending on the covering to provide some strength is designed to fly, not crash :D |
RE: Balsa Sheeting Question
ORIGINAL: Gray Beard ORIGINAL: Augie11 3/32 turns out to be the most useful but the suggestions on having 1/16 and 1/8 for certain applications are right on. Contest grade is hard to find, does ding a little easily but is an absolute pleasure to work with. If you get stuck with a rock hard piece of heavy balsa either throw it away or save it for a special use. I too have used both BUSA and Lone Star and although I've had some minor disappointments they try hard and are pretty good. Wish they would find something other than balsa to fill those giant wind turbine blades with. Heck, one blades' worth is enough balsa for one average modelers lifetime! |
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