Honda high thrust props

Hi

I have a 2006 Honda BF20 and need a high thrust prop to push a 4ton 34ft sailing catamaran.

I'm reckoning on about 7 knots top speed so thinking a 6 or 7" prop is appropriate?

I have the option of getting a 10x6-1/2 high thrust prop cheap. It is taken from a bf9.9, prop is 58130-ZW9-B22 PROP (10X6-1/2 HT) (Honda Code 7371529). It looks to me like bf8, 9.9, 15 & 20 all have the same size 8 spline shaft, can anyone confirm this?

Is there any other reason why I shouldn't put a prop designed for a BF9.9 on a BF20? (ie built more lightly?)

Thanks for any help
Ben

 

They are the exact same props and shafts.

 

for high thrust you need blade area which usually means diameter. Get the engine with the best gearing to swing the biggest diameter prop.
Size does matter!

 

10" is the largest diameter prop you can get on that motor. To get more area choose a 4 blade prop, they are available in 7 and 5 pitches probably under a $100 new (Solas)

 

I've used the Solas 4 bladers on the 20's I use to push a 5 tonne cat in pairs. Your biggest problem with the Honda props is spinning the centre out of them. I got mine solid bushed. Driving a nail in will get you home.

 

Thanks for the replies.

I've bought the 4 blade 10x6-1/2 from the BF9.9, hopefully it won't blow it's centre out straight away!

Ben

 

Sundreamer, how do you solid bush a prop so it doesn't spin out?

 

Our local propellor manufacturer does it for me. Henleys Propellors.
They push out the hub and rebed it in resin. I and other multi guys using Hondas found the props spinning out almost immediately.

 

thanks for the heads-up on the problem, I might try drilling and pinning it