Geriaviator,
The T'bolt was slightly smaller and lighter than the VV, but light-years ahead in performance !
My brief experience on them is described on Page 157, #3124 to #3131 on this Thread. They had the two-row Wasp Double: I never had anything to do with the "corncobs", I suppose four rows was as far as they could go before the air-cooling problem defeated them.
Danny.