That mistake is a logical result, considering the long stroke nature of the .61 in MVVS's quest for low rpm performance.

OT?
I think this is the crowded population realm that Europeans are in for some years now, and American citizens still have to enter.
It takes some getting used to the idea of low rpm performance, because in the beginning, screaming noise is mistakenly considered synonimous to power. I did, and so did many others, until we compared old .60 Webras in good condition (16000 rpm, 11x7) with the low rpm setups as used on ST, OS (12000, 12x8) and the mighty MVVS @ 10000, (14x7)
The Webra hardly got off the grass, where the larger props had no problem at all. The Flight envellope was about the same.