Propellers for twin Honda BF75 - 2007?

pikeman59

Cadet
Joined
Mar 25, 2008
Messages
11
Hi, I have a 6,10m Center Console with Twin Honda BF75 EFI:s.

I am currently running Solas Rubex 3x13x19 at approx. 5800 rpm, 38 knots and the antiventilation plates is about 15-20 mm over the bottom line.
I raised the engines 1 more hole ( 20 mm ) before putting the boat away for the winter and was planning to testride next spring to find out what props/propsize to run.

Now I have the opportunity to buy Michigan Apollo propellers really cheap ( at least for in Sweden) and I dont know what size to buy?

I think I will gain about 200 rpm for raising the engines 1 hole and loose about 200 rpm when running a cupped steel propeller.
If my calculations are right I will stay with 3x13x19 size propellers.

I Think the 3x13x21 props will be too much or?

What does the propgurus have to say about it, any ideas?

Thanks,

Sven B aka Pikeman
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
I don't know much about twin setups but::Often it is suggested to decrease pitch 1" when going from al to ss.Without knowing your present results I would say 21 are too much.
 
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