Hi George, I think you're on the right track, 10 oz for 230 sq"s will

work just fine for a TD .051. Barry Baxter's Wee Duper Zilch flew

great using a PAW .049; the WDZ has a 240sq" wing, and I believe

it weighed around 10 ozs also. I have flown several Ringmaster Jrs(195sq"s)

modified for the PAW .049 SBR diesel engine. my conclusion was that the

Ring Jr is too small for that engine. The Flite Streak jr will fly very well in spite

of a heavier wing loading; but it will be spectacular with a lighter wing loading. Good Luck;

Tony