Which Engine Should I use ???

[Larry Diamond]

Scott,

I tried a OS Surpass 91 w/Pump in an 8-1/2 lb plane (VMar Avenger - Not recommended for Pattern) to compete in Sportsman in 2001. The engine could not pull the 45 degree up line for the 1/2 reverse cuban eight. I replaced it with the 91FX and had no problem using the stock muffler, but again the weight was 8-1/2 lbs. More weight than that and you will need more power.


  ----- Original Message ----- 
  From: Dean Pappas 
  To: discussion at nsrca.org 
  Sent: Thursday, January 06, 2005 9:34 AM
  Subject: RE: Which Engine Should I use ???


  Hi Scott,
  tell us the pipe and length again.

  Dean Pappas 
  Sr. Design Engineer 
  Kodeos Communications 
  111 Corporate Blvd. 
  South Plainfield, N.J. 07080 
  (908) 222-7817 phone 
  (908) 222-2392 fax 
  d.pappas at kodeos.com 

    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Scott Anderson
    Sent: Wednesday, January 05, 2005 11:28 PM
    To: discussion at nsrca.org
    Subject: Re: Which Engine Should I use ???


    Hello,

    I use the OS91FX in a pattern plane and over the weekend Dennis Hunt from Zimpro had me do a test.. we ADDED lead to my 91 size viper and brought the dry weight up to 9.5 lbs and went and put a flight on it to see about the vertical ... And it went without a problem.. I'm running a APC 4 blade prop and 25% S&W fuel... also have added a perry pump to the set up last year runs great..

    scott
    nsrca529
      ----- Original Message ----- 
      From: Daniel J. Hamlett 
      To: discussion at nsrca.org 
      Sent: Wednesday, January 05, 2005 11:19 PM
      Subject: Which Engine Should I use ???


      I am going to be putting together an Exceleron 90.  I have 2 different engine options.  First is an OS FX91, second is an OS FS91 Surpass w/pump.  Both are NIB.  I have flow previous planes with a different 91FRX.  I am good with engines so I am not worried about any finicky engine issues with either one.  I have 2 two meter planes right now.  This plane is one that I want to be able to get home from work, grab it and go.  The 2 meter planes take a little bit more preparation to get them going quickly.  I want the plane to fly well with a good power curve.  I know that the 91FX will want to be flown a little bit faster, but how much I don't know.  Also would the FS91 II Surpass be enough to fly the plane well.  I will most likely be flying the intermediate pattern next year, so it doesn't have to be oh my God outrageous performance.  But I don't want tit to be a dog either.

      If there is anybody with any time on this plane that could shed some light on the situation it would be greatly appreciated.

      Dan
      Dst. 1
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