[NSRCA-discussion] A5 --- rx 1.40

Tue Jan 15 14:10:58 AKST 2008

APC makes 18.1x10, 18.1x10W, and 18.1x11 (not sure what is listed on their
website).

All the 18.1 props run well.  Comparing them to the 3 bladers, the 18.1s are
louder and heavier.  On the ground the 18.1x10 is about the same load as a
15.75-11 3b, but the 18.1x10 will unload more in the air.  Depending on
throttle technique, drag of plane, pipe and pipe length, either prop might
be easier to fly constant speed - most guys find the 3b tends to be more
constant speed as it does not unload as much as the 2b.  Exception is when
the 3b is bogging the motor, and the plane slows in an upline (if any prop
is bogging the motor, reduce prop size, add nitro, or lengthen the pipe).
If the plane is a little quick now, the 15.75-10 3b will slow it down, as
will lengthening the pipe.  Reducing the nitro will also slow the plane
down, but the sweetspots for the needles will be a little narrower (I agree
with leaving the nitro in).

Dave

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
Sent: Tuesday, January 15, 2008 5:10 PM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] A5 --- rx 1.40

I don't see an APC 18.1 x 10W on the APC web site. Did you mean 18.1 x 11?
Or is it a custom prop?

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of wgalligan
Sent: Tuesday, January 15, 2008 2:25 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] A5 --- rx 1.40

Mike,

The props Dr Mike are talking about work really well with the OS 1.40.  Its
best to get the prop you feel comfortable with in speed and then trim the
airplane as different props can change certain trim attitudes.  If you trim
the plane and then change props be prepared to retrim.  I really like the
18.1x10W Apc. FWIW. run on 15% Cool Power or 20/20, Karl Muller header,
Aeroslave pipe set at about 26 inch from plug to baffle.

Wayne Galligan

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

From: Mike <mailto:shineyobject at gmail.com>  Robinson 

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

Sent: Tuesday, January 15, 2008 12:53 PM

Subject: Re: [NSRCA-discussion] A5 --- rx 1.40

Mike - 1/2 throttle is plenty with the set up that I have and the engine is
performing very well at all positions. I believe I could do a cuban 8
without getting above 5/8 throttle. I may try the 18.1 x 10 two blade when I
have the opportunity. At the moment I'm mostly doing some fine tuning on the
trim, mixing and balance. Plus my thumbs are used to the more classic
pattern ships like Daddy Rabbit, Intruder and Dirty Birdy. Flying this Focus
is so awesome and graceful --- well it should be once I get my footing! Ha! 

On Jan 15, 2008 1:02 PM, Dr. Mike Harrison <drmikedds at sbcglobal.net> wrote:

Mike,

I find the 18.1x10 or 10w or 11 to be the best performance prop out there.
Regarding speed, I consider speed the enemy.  Go for a very medium paced
steady flow with very good vertical.  The OS should give about 7700 rpm with
the 10 pitch.  Fly 1/2 throttle or less on straight and level.  If you have
transition issues with the engine, the pipe is too short.  The exhaust
should be almost clear, a very light amber.  If it is darker, too lean,
green is too rich.  I have 3 stock OS 1.4 with good bearings.  They all
transition effortlessly and smoothly.  They have unlimited vertical.  My
plane is big and weighs 11 lbs.

Mike

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

From: Mike Robinson <mailto:shineyobject at gmail.com>  

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

Sent: Tuesday, January 15, 2008 9:17 AM

Subject: Re: [NSRCA-discussion] A5 --- rx 1.40

My plane is equipped with an OS 140RX with the OS Stainless Steel sealed
rear bearing, Carl Mueller header and Greve pipe.  Motor mount is a Gator
soft mount.  Tru Turn 3 blade FAI spinner with an APC 15.75 x 11 3 blade
prop. (I have a 10 pitch prop also.) Using 25% Pro Pattern the plane will
cover a lot of real estate quickly!  I'm wondering if I use 15% Cool Power,
F plug and change to the 10 pitch prop would I be better off...? 

On Jan 15, 2008 9:58 AM, Dr. Mike Harrison <drmikedds at sbcglobal.net> wrote:

OS F, Make sure your pipe is long enough-Macs header, ESpipe, plus 2 inches.
20% pro pattern is plenty.  18.1x10 or 11 prop.

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

From: Mike Robinson <mailto:shineyobject at gmail.com>  

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

Sent: Monday, January 14, 2008 5:23 PM

Subject: [NSRCA-discussion] A5 --- rx 1.40

I'm running an os 1.40  inverted with 25% pro pattern and sometimes during
hot weather 30% heli. Is an A5 OS plug my best choice based on some of you
guys experience? 

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