[NSRCA-discussion] APC 18.1 x 10W props

Wed Nov 15 12:58:25 AKST 2006

Jimbo – I’m really not sure about the fuel consumption.  I run a 20 oz tank
with a 2.0 oz header tank.  One time I flew P07 and ½ of F07.  The plane
reacts a little different between the 2 and 3 blade props, but the advantage
in velocity control is worth the other small changes.

Jim

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
jivey61 at bellsouth.net
Sent: Wednesday, November 15, 2006 4:48 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props

Jim

How was the fuel consumption with the DL prop?

I saw a marked increase with the standard 15.5x12 apc.

I stretched the Throttle curve in the midrange to tone down the power
acceleration,with my 18.1x10W.  I am considering lowering the top end rpm
and spreading out the stick sensitivity.

This will work except for windy days then I go back to normal throttle.

Jim Ivey

----- Original Message ----- 

From: Jim <mailto:jim.woodward at schroth.com>  Woodward 

To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, November 15, 2006 2:02 PM

Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props

Mike – Glad to see you on the list.  

With the 18.1x10.1 and YS 160 launching around 8100, the speed changes of
the plane nearly follow the throttle stick movement.  At full tilt, the plan
can still accelerate away from you, however, at ¼, 1/3, 1/2, ¾ stick
positions, the plane changes speed as you move the stick.  Very nice.  I
tried the DL 15.75x10 3 blade this weekend on the YS 160.  This prop is very
quiet, the overall speed was a tad less than the 18.1x10.1., At the top end,
it did not accelerate away from you, and overall, it was a bit easier to
shape the pattern.  Plane speed definitely changes with stick position.
With the 18.1 I find myself changing power settings on uplines and such –
requires quite a bit of throttle stick work to not “explode” through
maneuvers.  With the 3 Blade, it was easier to hit a consistent pace.  

3 Blade enough power?  I went through F07 too with it had more than enough
power to handle the Rolling S, top hat with ¾ point up,  4-point up.  This
prop is right in the sweet spot of the YS 160.  I did not tach this prop.
It was about 85 degrees in Miami.

Jim W.

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of george w.
kennie
Sent: Wednesday, November 15, 2006 1:03 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props

Welcome to the list Mike!!!!!

----- Original Message ----- 

From: Dr. Mike <mailto:drmikedds at sbcglobal.net>  Harrison 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

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 <mailto:pentagon.systems at bigpond.com>  Pennisi 

To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>  

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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