Originally Posted by JohnnyMW
Hi everyone had my Vipermax ( with Suzuki DF140) on the water for the first time yesterday at New Brighton on the Wirral. Fantastic day but it raised a prop question. I've currently got a 14x21" aluminium prop and yesterday managed a WOT 5500rpm and speed of 35knts. I realise reducing the pitch will increase max revs but should I risk going to 14x18" to get theoretically 6100revs and increase speed or is this too big a jump?
With that engine/hull combo I'm sure there is more performance to be had.
I'd Try speaking to other VM owners to see what they run...and what performance you can expect before spending out!
Once your confindent of what May be achieved ...it might well pay to get a SS prop in the chosen size,and keep your present one as a spare