[NSRCA-discussion] A5 --- rx 1.40

[wgalligan]

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 Robinson 
  To: NSRCA Mailing List 
  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 
      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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