I have a 72” ivo med. that I ran for about 200 hours on a stratus Subaru conversion (115 hp).
The prop was awesome ,easy to get the correct pitch ,quiet and trouble free.
i pulled the Subaru and won’t need the prop anymore. I have spacers and the spinner 11” .
gonna get rid of all of it . Subaru too if anyone is interested, firewall forward everything.
still running awesome going to a lycoming more HP.