• Become a Premium Member today!

    Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Why become a Premium Member?

    • Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts.
    • Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    Become a Premium Member today and experience HomebuiltAirplanes.com to the fullest!

    Upgrade Now

rotax 503

Find deals on amazon
Advertise with us
Find deals on ebay
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. S

    Rotax 503 gear replacement

    Hi, For my motorglider I acquired a 58x36 2 bladed propeller. According to calculations I was given with it it should produce about 756N (roughly 165lbs of thrust). The engine will easily overrew if not monitored even on the ground. I was looking into official recommended prop sizes for my...
  2. S

    2 Seater Chinook Plus 2

    2-SEATER CHINOOK PLUS 2 • $3,000 Chinook Plus 2 (Birdman 2S converted). I bought her 7 mo ago and have only had the Rotax 503 dual carb air-cooled, electric start engine completely rebuilt at Aircore Aviation in Arlington, WA. It has not been broken in yet since rebuilt in July 2017. Includes a...
  3. T

    Rotax 503 w/ 2.58 gearbox for sale

    I have for sale a SCSI Rotax 503 with 2.58 (A) gearbox for sale, I bought it with no logs so the hours are unknown, it runs perfectly. comes with exhaust and Bing carb. $850.00 I bought this engine intending on using it on my Parasol experimental, I have since decided to use a Generac. I...
  4. C

    Christian

    I'm a new owner of a Rocky Mountain Ridge Runner II with a Rotax 503 single carb swinging a ground adjustable prop. The airplane and engine have less than 30 hours on them but are 8 years old. They've been hangar-kept all this time. Both had an annual recently and the engine's been run...
  5. cavelamb

    Wes is offering his finished parasol for sale...

    I'm passing this note along for Wes. Richard ================================================== ============ Richard, Thanks for the kind words . It brings you back in time and is a great plane with no bad habits. It stalls around 30 and cruises at 55 mph at 5800 rpm. the ASI is very...
  6. P

    Rotax 503, bench test run w/o gearbox?

    Hello All... I recently purchased a Rotax 503 that was rebuilt by an experienced UL instructor and Rotax mechanic. He was selling all his stuff before moving and I can't find him now so I'll ask you guys... Can I start and run this engine on my workbench without a gearbox or prop without...
Back
Top