HPA

The Mystery rubber-powered model is approaching the covering stage. I will use Mylar/tissue for the flying surfaces, which are open framework structures.

However, the fuselage is fully sheeted and I'm not sure whether to Mylar cover it first or just apply tissue.

My thoughts are that the sheet structure provides as much, if not more, strength to the tissue than Mylar so the question comes down to weight. In other words, will the weight of the Mylar and very little dope be more or less than the weight of the dope used on the sheeted structure. I suspect more dope will be used without the Mylar barrier, since it will not only soak into the tissue but also will be absorbed by the balsa.

I know that this is a clear case of over-thinking an issue, but does anyone have a view?

I think the fly in the ointment may be covering a sheeted surface with mylar. I can't speak from experience but covering sheeted surfaces with any plastic film requires careful temperature control and technique - perhaps the thin mylar may be easier to keep tight.

Perhaps a small test would be the way to go - good luck.

John

Quote from: Jmk89I know that this is a clear case of over-thinking an issue, but does anyone have a view?

Yes, my view is that you're clearly over-thinking the issue.

Soh-reeee - couldn't resist :D. Actually, I'm interested to see what befalls, being completely ignorant about Mylar and Mylar/tissue. Good luck with your covering.

Stephen.