If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 2 of 2

Thread: 61fx or 75fx

  1. #1

    Join Date
    Oct 2008
    atchison, KS
    My Gallery
    My Models
    My Feedback

    61fx or 75fx

    Hi. I just purchased a Seagull 71" Decathlon. I have an OS 61fx that is nib. The plane is in the 7 to 8 pound range. Calls for a 75 two stroke. Would the 61 be enough motor or should I go with a 75ax. Also what is the hp difference between the two. One more thing, I want to run a pitts style muffler. Is there any hp loss or torque loss between this muffler and the stock.
    Thanks for any information on this subject

  2. #2
    Join Date
    Apr 2002
    Champaign, IL

    RE: 61fx or 75fx

    A .61 engine will easily fly a 7-8 pound airplane. In fact, it will fly airplanes up to about 12 pounds, depending upon the model type. The manufacturer may have recommended the .75-size engine because it will be a little better for aerobatic performance.

    Power output:

    .65 AX: 2.0 hp @ 16,000 RPM
    .75 AX: 2.4 ps @ 15,000 RPM

    ps is just about the same as hp. The 0.4 difference is when the engines are running at peak. You won't run the engines near that, so their power difference will be very much smaller.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
RCU Reviews
All times are GMT -6. The time now is 08:12 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.