OS 91 Pipe Settings

[Ihncheol Park]

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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