OS 91 Pipe Settings

[Scott Anderson]

Bob,

I'm running a 13.8X10 (4) blade on my OS 91 Fx with a perry pump with 25% S&W fuel... using a macs pipe.. have a ton of power can make the plane go out of sight.. plane a Viper 91 (prototype) for the OS project..oh yeah 7-1/2 pounds!!!

scott
  ----- Original Message ----- 
  From: Ihncheol Park 
  To: discussion at nsrca.org 
  Sent: Sunday, December 12, 2004 1:55 AM
  Subject: RE: OS 91 Pipe Settings


  Bob,

  My 91SX-H (91FX) is at 21.5" (plug to baffle) with BlueBird 140 size pipe. 10500 rpm.  I ran this setup last summer with 20% or 15%. Prop was APC 15x8

  I still have to try Karl's header (wraparound) in the Explorer (Excelleron).  
  I may be able to get the approximate inside dimensions of the pipe so that you can compare with other pipes.
  let me know if you want.

  I am going to try 25" (plug to baffle) and larger prop. 15.5x12 that Nat runs.  Not sure if this is a 4-blade prop or 2-blade prop.  I actually try to run a larger diameter prop (16 or 17" dia) with lower pitch. 

  Ihncheol Park
    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Bob Pastorello
    Sent: Saturday, December 11, 2004 5:37 PM
    To: discussion at nsrca.org
    Subject: Re: OS 91 Pipe Settings


    Nope.  Just used OS as the header, figuring it would draw more info - NOT.  Flew the Exc. today four flights.  VERY good airplane, but needs the 90 on a pipe, I'm sure.  Plus CG was nose heavy.  Report is on RCU.
        Anyone have pipes with 90's ????

    Bob Pastorello
    NSRCA 199  AMA 46373
    rcaerobob at cox.net
    www.rcaerobats.net


      ----- Original Message ----- 
      From: Randy 
      To: discussion at nsrca.org 
      Sent: Saturday, December 11, 2004 5:34 PM
      Subject: Re: OS 91 Pipe Settings


      Are you changing out the TS 91 already Bob?  The rain stopped this afternoon.  Looks like the weather may be good enough to let me test fly my Excelleron90 tomorrow.  

      Randy
        ----- Original Message ----- 
        From: Bob Pastorello 
        To: NSRCA 
        Sent: Saturday, December 11, 2004 9:49 AM
        Subject: OS 91 Pipe Settings


        Anybody out here (besides Nat) have a conventional pipe setup on a OS 91FX ???  Measurements, props, rpm range, please?  Just need starting point... thanks!

        Bob Pastorello
        NSRCA 199  AMA 46373
        rcaerobob at cox.net
        www.rcaerobats.net

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