Excelleron with OS 91FX in Intermediate ?

[Bob Pastorello]

In the few flights I put on this airplane with the new, muffled, 91 2-stroke, it was rapidly apparent that these guys had done their homework.  I was also nose heavy (the CG needs to be 7.25 aft of leading edge), so mine was a little 'heavy' on the stick in pitch.  However, it is a very solid airframe, rolls very cleanly, straight, didn't need differential.  Vertical line tracking was exceptional;  it would drop dead straight, no pitching.  Knife edge has NO roll couple, and only VERY slight belly pitch.

The wing lets it decellerate rapidly, and you can just drag it up to your spin entry, nose high, nearly stopped then = BANG, nose drops without a wing wiggle, and it will do a VERY nice rudder/elev only spin.  Exits on a dime!  Snaps are the same;  I didn't find a need to lead any control inputs for the up or down 45 snaps.  ANd the Reverse Avalanche is wonderful.  Airplane stops at the snap, throttle up, and finish the loop.... very cool.

It's a keeper, and certainly ended up being way more than a "knockaround" practice plane for me.

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


  ----- Original Message ----- 
  From: Paul Horan 
  To: discussion at nsrca.org 
  Sent: Tuesday, December 21, 2004 9:49 PM
  Subject: Re: Excelleron with OS 91FX in Intermediate ?


  Bob,
      For me it was need. Originally I wanted a "knockaround" pattern plane maybe a 3D twist, the response I got to that was a very polite "are you nuts!".  After rethinking my goals and listening to the responsed I received I decided on the Excelleron.
  Reasonalble price, good quality and I hope good performance.
      I am looking forwards to hearing about your experience with this plane.  Any caveats or advice on a 120 2 stroke, cost is 
  a concern but so is performance.
  Thanks,
  Paul
    ----- 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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