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  ss prop- down on Pitch question

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Author Topic:   ss prop- down on Pitch question
blackdog posted 11-09-2001 01:28 PM ET (US)   Profile for blackdog   Send Email to blackdog  
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?
OutrageMan posted 11-09-2001 09:26 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Probably not alot. The smaller diameter should come close to making up for the heavier wheel.

Brian

blackdog posted 11-12-2001 12:30 PM ET (US)     Profile for blackdog  Send Email to blackdog     
Thanks
Bigshot posted 11-13-2001 03:30 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
sounds good to me. If too high and can't return have it cupped)better holeshot too).
blackdog posted 11-13-2001 04:21 PM ET (US)     Profile for blackdog  Send Email to blackdog     
Ah bigshot where ya been hiding?
The wheel is on the way
newboater posted 11-13-2001 07:08 PM ET (US)     Profile for newboater  Send Email to newboater     
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?

Dave S.

newboater posted 11-13-2001 07:10 PM ET (US)     Profile for newboater  Send Email to newboater     
Opps stupid me.

I looked at the topic. He was changing to a ss prop. I feel so stupid.

Dave S.

blackdog posted 11-16-2001 09:47 AM ET (US)     Profile for blackdog  Send Email to blackdog     
Got the prop. It is actually an SST II. What is the difference between SST I & SST II. Cupping?
part # 389948


Blackdog

Bigshot posted 11-16-2001 11:29 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
SST 2 is double cupped.
blackdog posted 11-20-2001 04:36 PM ET (US)     Profile for blackdog  Send Email to blackdog     
ooh la la
stagalv posted 11-22-2001 10:42 AM ET (US)     Profile for stagalv  Send Email to stagalv     
Blackdog,
What is the max RPM for the 115 Ficht. Isn't it 5750??
blackdog posted 11-27-2001 08:53 AM ET (US)     Profile for blackdog  Send Email to blackdog     
That's what the manual says, 5750. Engine will cut out 6050 per the dealer
tbyrne posted 11-27-2001 10:24 AM ET (US)     Profile for tbyrne    
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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