ah, who knows?

I had stock muffler. I had like 3/4oz on the tail to maintain inverted 45 degree up line, tried a full ounce but found it wanting to climb out at the top of a loop. But everyone's different, as is every plane. 3oz is a lot though. i dunno.

i'm glad this thread is still going. the Venus is a really great plane to fly. i was pretty attached to mine. easier conversion to electric and I'd probably still have it.