Zenith Aircraft Builders and Flyers
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Rotax 912 looses power on takeoff
In the past there was a thread about a rough running Rotax 912 engine. The author had changed about everything: plugs, had the carbs reworked, etc.. In the end he found that the vent tube had been changed or re-routed and caused leaning when the aircraft accelerated - hence pressure affecting the delicate balance of bowl vs internal carb pressure reference.
I have been researching this phenomenon to advise a Rotax powered gyrocopter owner - same problem: runs fine on the ground but looses power as the gyrocopter accelerates building airspeed.
Would the owner of the thread please contact me off site at (madriver42@ gmail.com) or if there is a way to go back to this thread how do I do it??
Thanks loads - I already am aware of the problems caused by the re-route of the vent line I just need some facts to back it up in a real world situation.
Still grinnin
Phil Smith
CH - 701
Buhl, ID
Replies to This Discussion
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Permalink Reply by ray atkinson on
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That was john mazzoli that was having the problem. The rotax install manual addresses this. John is on here a lot is hangered at Arlington and very active.
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Marzulli sorry john
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Permalink Reply by Phil Smith on
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Thanks to all who responded - what I took away from all this is to be hyper critical on inspecting the carb to boot junction and also vent lines..
Wish I had the pictures to attach -but on closer inspection our local mechanic - found that the carbs were not fully seated on the carburetor rubber boot. I still want to see what was done to the vent lines.Xenon IV Sport GyrocopterRotax 912 ULST (add on turbo)Now the story is getting out - A mechanic, not local - had rebuilt and reinstalled the carbs after a forced landing due to a "worn clip" in the carburetor - still not sure whether or not they have looked at the vent lines. All I can do is make suggestions.The last frackus caused the engine to lose power during takeoff - I witnessed that one and the guy never got above thirty or so ft then turned into the wind - slight cross wind - and then downwind while hanging on a thread...you can imagine the results. The gear - Zenith type - was splayed out about ten inches and the nose wheel strut was bent and broken from the impact. Lucky he ran out of ideas and altitude over a dirt part of the airdrome.Believe it or not this guy owns a machine shop and the structure is all repaired the carbs bolted on and they - the local mechanic and some representative of the gyrocopter - are going to fly it tomorrow.All I can say is "film at 10 pm on your local news".Needless to say I think I would get some more professional opinions...all I can do is suggest.
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