[NSRCA-discussion] APC 18.1 x 10W props

[Richard Strickland]

Don't get your picture taken with Harrison--he makes everyone else look fat.
Hi Mike!

Richard
  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Dr. Mike
Harrison
  Sent: Wednesday, November 15, 2006 4:26 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props


  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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