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A "Universal" Filler Material. We've found a great "Universal" filler that can be used on balsa or foam, and can be diluted to either be a firm sticky paste, or a more liquid, brush-on type material. You can make it from two common hardware store ingredients. First is Durham's Rock Hard Water Putty. This stuff looks sort of like corn meal, and comes in a cardboard can. Like the name implies, by itself it cures to a Rock Hard configuration. It's way too hard.. and too heavy.. for our model airplane applications. But if you mix it with DAP brand Light Weight Spackle (about 50/50), you get a fast curing filler, that is strong, but reasonably light weight. As a bonus, you can thin it out with water, and it makes a brushable filler that can be used on foam, balsa, obechi sheeting, etc.

When man first tried to build a flying machine, he tried to copy the wings of a bird. Great idea, except that birds are constantly changing the airfoil, planform, angle of attack, and sweep of their wings. In the process, copying what appeared to be a highly cambered, very thin section airfoil just Didn't Work Out Very Well. Want to learn more about airfoils? Check out our "Everything You Always Wanted to Know About Airfoils" video. Click on the Products link above....

Soaring Stuff
Taylor Collins
email: taylor@soaringstuff.com
tel: (505) 898-8281