Hi,

I'm sure someone can suggest several ways to make a fuselage stronger, but you need to give us more info. Which super decathlon do you have and why you want to make it stronger. Because if you want to make it strong enough to survive a bad chrash, then you're out of luck. There's no way you can do that without making it too heavy.

Anyway, if you're trying to learn with a Super Decathlon without an instructor, I think most will agree that it's not the right way to learn. Decathlon might be a high wing plane, but it has little or no dihedral and it's wing loading is a little on the high side, so it is much more difficult than a trainer. I say this from experience (don't ask )

Serafim