Speaking of power

[David Lockhart]

Jon,

The APC part number is LP3157513 and it is available on the apcprop.com 
website.  The prop has actually been around for about (?) 3 years.  It 
has not gained much popularity (yet) as it is a pretty heavy load, and 
it is only a limited number of flyers seeking "more quiet" and willing 
to experiment outside of the currently popular 15.5-1#W, 16.5-12,13W, 
and 17-10,12.  I suspect more 3 and 4 blade props will be seen in 
future as the engines continue to get stronger (and louder if the RPM 
is not kept in check) and the ground clearance continues to get shorter.

Regards,

Dave Lockhart
DaveL322 at comcast.net

----- Original Message -----
From: Jon Uhler <juhler at jfmolloy.com>
Date: Thursday, May 29, 2003 10:40 pm
Subject: RE: Speaking of power

> David,
> 
> Where does one get a 15.75x13 3 blade prop?
> 
> Thanks,
> 
> Jon
> 
> -----Original Message-----
> From: David Lockhart [DaveL322 at comcast.net]
> Sent: Thursday, May 29, 2003 9:05 PM
> To: discussion at nsrca.org
> Subject: Re: Speaking of power
> 
> 
> 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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> >  Free online calendar with sync to Outlook(TM).
> 
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