[NSRCA-discussion] APC 18.1 x 10W props

[Dr. Mike Harrison]

Yeah, Yeah, Yeah.......

  ----- Original Message ----- 
  From: Gray E Fowler 
  To: NSRCA Mailing List 
  Sent: Wednesday, November 15, 2006 2:49 PM
  Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props



  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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