[C36IA] prop pitch and engine problem

[sprigman at optonline.net]

I have the same prop on hull 2010.  The setting is 18.  Has motored well for 7 years.  Sounds like the Tach.
Fred Sprigman

----- Original Message -----
From: Darin Duphorne 
Date: Wednesday, July 1, 2009 9:57 pm
Subject: [C36IA] prop pitch and engine problem
To: c36list at c36ia.com

> I'm post-survey, but still pre-purchase of a 2000 C36MKII with a 
> Max- 
> Prop 3-blade feathering prop. I've read enough of the forum 
> posts to 
> get an idea what rpm and hull speed I should be getting but it's 
> 
> really weird, and I can't tell what might be causing the issue 
> other 
> than prop pitch.
> 
> In the sea trial, I was only getting about 4.5kts under full 
> power in 
> flat lake conditions. Free rpm was around 2850 and loaded rpm 
> was 
> about 2800 (50rpm droop -- not enough).
> 
> We asked seller to repitch to confirm, and he's been having a 
> diver do 
> it with no success. Here are the things they've tried...
> 
> 15x18 4.5kts 2800rpm
> 15x20 6.7kts 1800rpm
> 15x18 6.8kts 1900rpm
> 15x16 7.0kts 16-1700rpm (yikes!)
> 
> It's weird! I can't imagine an engine related issue, or it 
> wouldn't 
> get to 2800rpm, I wouldn't think. Compression problems when loaded?
> 
> Any ideas?
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