[NSRCA-discussion] APC 18.1 x 10W props
Dr. Mike Harrison
drmikedds at sbcglobal.net
Thu Nov 16 09:24:21 AKST 2006
Matt,
Do as you wish, but customizing your own stuff brings on its own set of problems, I doubt you will be satisfied.
Mike
----- Original Message -----
From: rcmaster199 at aol.com
To: nsrca-discussion at lists.nsrca.org
Sent: Thursday, November 16, 2006 10:25 AM
Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props
Mike, how about a 20X9 so that we could do our own tweeking of pitch and dia??
Matt
BTW- A bit surprised you finally took the plunge but glad you did and hopefully you will stay awhile.
-----Original Message-----
From: drmikedds at sbcglobal.net
To: nsrca-discussion at lists.nsrca.org
Sent: Thu, 16 Nov 2006 10:53 AM
Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props
Ryan,
Yes, but you may need to go to APC online and request it.
Mike
----- Original Message -----
From: Ryan Smith
To: 'NSRCA Mailing List'
Sent: Wednesday, November 15, 2006 8:51 PM
Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props
Mike,
Is the 18.5x9.5 available yet?
-Ryan
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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 5:26 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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