[NSRCA-discussion] APC 18.1 x 10W props

[Gray E Fowler]

Good God almighty! Mike Harrison on the list! Can Art Wagner be far 
behind?



Gray Fowler
Senior Principal Chemical Engineer
Radome and Composites Engineering
Raytheon

nsrca-discussion-bounces at lists.nsrca.org wrote on 11/15/2006 02:41:42 PM:

> Thanks George!
> ----- Original Message ----- 
> From: george w. kennie 
> To: NSRCA Mailing List 
> Sent: Wednesday, November 15, 2006 12:03 PM
> Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props
> 
> Welcome to the list Mike!!!!!
> ----- Original Message ----- 
> From: Dr. Mike Harrison 
> To: NSRCA Mailing List 
> Sent: Wednesday, November 15, 2006 8:31 AM
> Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props
> 
> Peter,
> Hi,
> I am Mike Harrison, I worked with APC to develop these props.  Let 
> me tell you the goal of the prop design.  It is to fly at a moderate
> to slow constant speed under the noise limit but with good pulling 
> performance.  Therefore, regarding the rpm, the 8000 is about ideal 
> for that prop, turn it much more and you will be above the noise limit. 
> 
> I find it interesting that you determine whether a prop is adequate 
> by first tacking it.  I would think you would fly it first to see if
> it was adequate.  I would encourage you to do that first.  The OS 
> 140 turns it about the same and it flies very well. 
> 
> The whole purpose was to develop a prop that would fly at a 
> deliberate pace at about 150 meters to compete with the electrics. 
> 
> There is also an 18.5x9.5 which I fly and it turns about 7500 rpm. 
> I like it better than the 18.1x10.  I am working on a 19x9 at the 
moment.
> 
> Good luck
> Mike
> From: Peter Pennisi 
> To: 'NSRCA Mailing List' 
> Sent: Tuesday, November 14, 2006 5:48 PM
> Subject: [NSRCA-discussion] APC 18.1 x 10W props
> 
> 
> I recently purchased some 18.1 x 10W APC props for my DZ160. 
> Apparently there appears to be another version 18.1 x 10.1.
> 
> Could someone please tell me the difference between both?
> 
> I tried a quick ground run on this prop (stock) this morning but 
> could barely get 8000 RPM from the engine. I will take advice from a
> member on this list and lop 1/4inch of each blade. What RPM readings
> are people getting who are using either of these props on a YS DZ160 
engine?
> 
> 
> Regards,
> 
> Peter 
> 
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