[NSRCA-discussion] APC 18.1 x 10W props

Wed Nov 15 04:31:45 AKST 2006

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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