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ContinuousWave: Whaler Performance
ss prop- down on Pitch question
|Author||Topic: ss prop- down on Pitch question|
posted 11-09-2001 01:28 PM ET (US)
I run 14x17 Alum prop on my 115 Ficht.
5900 Rpm’s @ Wot. - perfect match
What effect will a 13 3/8 x 17 have on the Rpms?
posted 11-09-2001 09:26 PM ET (US)
Probably not alot. The smaller diameter should come close to making up for the heavier wheel.
posted 11-12-2001 12:30 PM ET (US)
posted 11-13-2001 03:30 PM ET (US)
sounds good to me. If too high and can't return have it cupped)better holeshot too).
posted 11-13-2001 04:21 PM ET (US)
Ah bigshot where ya been hiding?
The wheel is on the way
posted 11-13-2001 07:08 PM ET (US)
I flat out don't understand Outrageman's response about a "heavier wheel". Please educate me.
We reduce the diameter by about 5%. If the relationship between RPM and prop diameter were linear, it would suggest WOT rpm would be 6200 rpm. If it goes up by the square of the ratio (which I'm guessing it does), WOT rpm would almost be 6500 rpm.
He didn't mention he was changing materials or prop types. Certainly prop weight has nothing to do with max RPM. Am I missing something here?
posted 11-13-2001 07:10 PM ET (US)
Opps stupid me.
I looked at the topic. He was changing to a ss prop. I feel so stupid.
posted 11-16-2001 09:47 AM ET (US)
Got the prop. It is actually an SST II. What is the difference between SST I & SST II. Cupping?
part # 389948
posted 11-16-2001 11:29 AM ET (US)
SST 2 is double cupped.
posted 11-20-2001 04:36 PM ET (US)
ooh la la
posted 11-22-2001 10:42 AM ET (US)
What is the max RPM for the 115 Ficht. Isn't it 5750??
posted 11-27-2001 08:53 AM ET (US)
That's what the manual says, 5750. Engine will cut out 6050 per the dealer
posted 11-27-2001 10:24 AM ET (US)
I'd would guess that the changeover to the SS prop will lower the rpms a bit. SS can be cupped more than aluminum, which allows the prop to "grab" the water better. However, the greater cupping should lower the max rpm.
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