Brent I called Sensenich on the prop because so many people were concerned about it might be the wrong prop for the engine. They told be they had all the spec's for the Twinstarr and cuoldbuild me a prop anytime.
I ask them about my large prop. They told me they special made it for the Twinstarr. The lager blade the prop has makes it quieter in flight. I never paid much attention to it. but it does not make hardly any noise. Just the engine and the air moving. I really like it.