PROPS

[SC31]

BERTRAM 31 WITH YANMAR 315's . ANY ADVICE ON BEST PROPS FOR THIS SET-UP ?

[dougl33]

I won't know either way, but you need to post the transmission ratio.

[Pete Fallon]

SC31,

Buddy Boy 1973-2004 31' FBC with 315 Yanmars ZF 2:0 ratio gears, 4 blade Michagan DXQ nibral Port 20x24, Starbord 20x 23 #4 cup.

Zero Cavity 1965-2007 31 FBC with 315 Yanmars ZF 2:0 ratio geas, 4 blade Michagan Dyna Quad nibral both 19x23 unknown cup.

Both boats were total redos with clean fared bottoms, Capt. Patrick's oversized rudders, 1-1/2" shafts. Bruce and I did both sea trials and both boats did 31-32 knots wide open throttle.

[Tommy]

Island Girl: Yanmar 6LP-STE 315 HP with 2:1 gears swings 20X23.5 four-blade props and performs exceptionally well.

[charlie falkenstein]

this is from capt. pat when i was in the process of repowering PLAYPEN


trans gear ratio-- 2:1
shafts -- 1 1/2'' (prefer Aquamet22)
props -- 20x 24 4 blade

i cruise at 28 kts 3200 rpm
wot 34 kts
cruise 1.6 miles to 1 gallon

performance is incredible

[Ric]

1975 F.B.C exceptionaly heavy and loaded but weight distribution proportionate and balanced
Yanny 300's turning 2 to 1 zf's 4 blade 20 x22 light cup
exceptional smooth performance and handling,,,,,,,,,,

[ed c.]

I'm with you guys on the 20x23's.
I have to tell you I ran into Richard Mastery at the Miami boat show. He was adamant in telling me that everyone is wrong. They should be 20x21 he said, then he went into a tirade about how much more he knows about the 31's and Yanmars then anyone else. He had a bad morning. I guess business is slow.

[CaptPatrick]

Ed,

Got a chuckle out your encounter with Richard. Believe me, I've had the same conversation with him.

Br,

Patrick