Speaking of power

[David Lockhart]

I previously ran both the 17-12 and 17-12N on my 140EFI.  The 17-12 was 
only about 100 RPM less on the ground.  In the air, it was a very 
different story - the 17-12 actually unloads quite a bit more and is 
louder in the air.

The 15.75-13 3 blade - it is a little too much load for the 140EFI 
unless you run a lot of nitro.  That prop de-pitched to 11" turns right 
about 8,000.  Set rich, at 7,700, I think the last time I db'd with a 
good meter it was 89 db.  Very quiet and my favored prop for P03 and 
F03.

Dave Lockhart
DaveL322 at comcast.net



----- Original Message -----
From: wgalligan <wgalligan at cnbcom.net>
Date: Thursday, May 29, 2003 2:23 pm
Subject: Re: Speaking of power

> OS 1.40RX  17x12N APC 15% Cool Power on our own homemade c.f. 4 
> chamber pipe = 94 db    I think going to the regular 17x12 would 
> be quiter.   Lots of carb and prop noise at this rpm level.
> 
> Wayne
> 
>  ----- Original Message ----- 
>  From: Bob Kane 
>  To: discussion at nsrca.org 
>  Sent: Thursday, May 29, 2003 12:09 PM
>  Subject: Speaking of power
> 
> 
>  Has anyone measured the sound levels of the larger two strokes 
> turning the big props?  We measured a YS140DZ with ES pipe turning 
> a 17X12 APC and came up with 96dB, right on the limit.   Just curious.
> 
> 
>  Bob Kane
>  getterflash at yahoo.com
> 
> 
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