Gfeldman Posted June 28, 2020 Report Share Posted June 28, 2020 Hi All, I'm hoping that you can help me solve the following issue. Two days ago at 10:00am on a 35 mile flight in my Phoenix the Rotax produced >5000rpm on before roll started on takeoff. On my return flight I noticed a max rpm of 4800rpm even after leveling off. I thought the density altitude could explain the difference as it was about 10 degrees warmer on my return flight. Yesterday I did a static runup on the ground in cooler air and found max rpm to be 4700-4800 rpm. There was the expected mag drop and increase when each mag was tested separately at 3000rpm. I plan to check for possible fuel contamination. Do you guys have any other thoughts? Thanks George Feldman N33GF Quote Link to comment Share on other sites More sharing options...
Registered Eric Greenwell Posted July 14, 2020 Registered Report Share Posted July 14, 2020 Was the engine running smoothly at the reduced RPM? I've have the RPM drop 500 rpm a few times, but there was always extra vibration. Could it be the RPM is correct but is being indicated incorrectly? Try asking on the Rotax Owners group, too: https://www.rotax-owner.com/en/forum Quote Link to comment Share on other sites More sharing options...
Gfeldman Posted July 14, 2020 Author Report Share Posted July 14, 2020 Eric thanks for this tip. After my last post I flew the Phoenix around our pattern 1x and found that on the takeoff roll I was getting 5050rpm substantially higher than the 47-4800 I got on static run up. No discernible vibration at or below 3000 today when I flew 45 miles to my A&p for its annual. I will have him sync carbs and ck them. George Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.