[NSRCA-discussion] A5 --- rx 1.40

[Dr. Mike Harrison]

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 
  To: NSRCA Mailing List 
  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 
      To: NSRCA Mailing List 
      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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