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Old 27 August 2008, 09:22   #11
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Country: France
Town: Cannes
Boat name: midkat 550
Make: apoge
Length: 5m +
Engine: 2x50 Tohatsu
Join Date: Jan 2008
Posts: 126
On my Tomcat/Stingray 4.5m catamaran, I am running a SS Powertech SRG3 on a Merc 60-EFI, small foot (not the big foot), it is a 12.50 diameter, and the blade area is very close to that of big foot props.

The other standard props (diameter 10" approx.) aluminium, SS or composite like the 4 blades Comprop do not work well (they don't push, and they cavitate ...) on this hull because of not enough blade area and/or length/diameter.
The problem is for sure the diameter, because the Comprop has more overall blades area than SRG3.

I think there is no other prop of this size for 13-splines 50/60Hp matching its performance, and I have a spare one in 13"
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Old 27 August 2008, 09:35   #12
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Country: UK - England
Town: Brum
Boat name: UTV
Make: zodiac FR
Length: 3m +
Engine: 2 stroke 15hp
MMSI: 999
Join Date: May 2003
Posts: 379
I have a Michigan Rapture thats 11 3/4 inches x pitch of 15" and it fits my small gearbox 13 spline 60hp 2 stroke. Performance was limited by the max 4800 rpm achieved. I have also run a 17" pitch quicksilver. Settled on a 13" pitch quicksilver, which I started with . It runs to around 5300-5600 rpm and gets about 33 knots, quick hole shot with a full tank and 5 adults, 27 knots.
The gearbox ratio on this engine is quite high, 1:2.1. I think. The prop spins faster than most outboards hence the lower than expected pitch.
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