Ok, who's going to explain this? Actually, the idea with the original Pico TM was to see how slow you could get it to fly. That added to the realism of flying a real Moth. Our forefathers in this thread taught us to respect the fact that the kit flew like the real plane. They also passed along a dreaded dislike for anyone flying the TM without a cowling.
I have one that is a rocket... but it was designed for that.... My other moths still fly on an IPS... I don't see a picture of the "Super Moth"... I'll have to find one and post it. If you want speed out of a Biplane this is it.
It would be even faster if I eliminated the top wing... but then it wouldn't be a Tiger Moth.