Register

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

  1. #1
    Bill Fleming's Avatar
    Join Date
    Apr 2005
    Location
    Eagle, ID
    Posts
    94
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    OS 300 twin upgrades available?

    I have a OS 300 twin that was purchased new approximately 15 years ago. They hadn't been out long and I suspect mine was one of the first. I am finally getting ready to put it in service. My question is: Are there any upgrades/improvements available that I should consider? Better bearings, stronger rods, etc.

    What RPM at WOT should I expect with a 20x10?

    Tx, Bill

  2. #2
    Moderator
    Join Date
    Apr 2002
    Location
    Champaign, IL
    Posts
    18,033
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 300 twin upgrades available?

    Between the earliest of the O.S. FT-300 engines and the current ones, only the connecting rod has changed. They went through a few iterations in the early few years because the rods were seizing to the crankshaft. The main problem was oil and breakin, but they decided to change the alloy in the rods.

    The engine should be broken-in with fuel that has about 18% oil content. Fuel with some castor oil in it is good. You want to run the engine as rich as possible and still run at full throttle. Run the engine this way for 20-40 minutes before you start to lean the engine. Lean gradually. You should be able to have the engine running at full throttle and leaned to just rich of peak RPM by about an hour's total running time. Then adjust the idle.

    At this point, it's a good idea to replace the glowplugs and then go fly.


    With an APC 18 x 12 prop, we normally see an idle of about 1,700 RPM, and full throttle running of about 7,300 RPM. If you add an on-board glow plug battery, idle can be reduced quite a bit lower.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 12:58 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.