Excelleron with OS 91FX in Intermediate ?

[Jeff Hughes]

Bob,
I'd be interested to know what pipe, header, lengths, props etc on the 90 two stroke. I'm building a CA models Zafiro with a 90 (Tower had a $25 off so I bought a super tiger 90 for basically $95!). And am thinking of piping it.
Jeff

  ----- Original Message ----- 
  From: Bob Pastorello 
  To: discussion at nsrca.org 
  Sent: Tuesday, December 21, 2004 10:26 PM
  Subject: Re: Excelleron with OS 91FX in Intermediate ?


  Forgot to add that I have # 2 here, and it is being configured with the 91 two stroke on a tuned system.  It will be interesting to be able to compare the two.

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


    ----- Original Message ----- 
    From: Bob Pastorello 
    To: discussion at nsrca.org 
    Sent: Tuesday, December 21, 2004 9:23 PM
    Subject: Re: Excelleron with OS 91FX in Intermediate ?


    The 1.20 class two-strokes in this airplane will probably provide the best power at the lightest overall weight.  The ST is overkill, and added about 8-9 oz overall more than should have been there, because it starts out at 31 oz, then add the exhaust system.  Most of the 1.20's, I think, are coming in at 31-33 oz WITH exhaust systems, and that reduces wing loading about 2 oz/sq.ft.

    I'm ready to test hop, awaiting the header, which is in process.  It is surprising to see this one design catch on so rapidly.  Was it price?  Performance?

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


      ----- Original Message ----- 
      From: Randy 
      To: discussion at nsrca.org 
      Sent: Tuesday, December 21, 2004 9:10 PM
      Subject: Re: Excelleron with OS 91FX in Intermediate ?


      I order a Tiger Shark 1.20 for my excelleron90.  Should be about right.
      Randy
        ----- Original Message ----- 
        From: Paul Horan 
        To: discussion at nsrca.org 
        Sent: Tuesday, December 21, 2004 6:37 PM
        Subject: Re: Excelleron with OS 91FX in Intermediate ?


        Bruce,
            Thanks, that's what I am concerned about.  The OS 91 FX most likely will require a pipe to do the job and the Excelleron
        is not set up for a pipe.  I may have to resort to a larger 2 stroke engine.  Bob Pastorello is using a Super Tiger 2300.
        Not sure I wish to go that big !
        Thanks,
        Paul
          ----- Original Message ----- 
          From: Pattrnflyr at aol.com 
          To: discussion at nsrca.org 
          Sent: Tuesday, December 21, 2004 5:22 PM
          Subject: Re: Excelleron with OS 91FX in Intermediate ?


          I have a scratch built Typhoon 909 that weighs around 8 to 8.5 pounds.  The "Littlephoon" has 909 square inches of wing, about a 70 inch wing span.  I fly intermediate at 5500 feet MSL.  The YS91 did not have enough to fly the Int pattern, because of the two maneuvers you mentioned.  I put a YS 110 in the Littlephoon, and now I have plenty of power swinging a 15X8.  I have no experience with the OS, but I would think the YS would be a little lacking. 

          See ya,

          Bruce 
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