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i"ve just put a new ea81 engine in my single seater. it was previously set up with a rotax box the usual standard 2.62:1 ratio and 76 " prop.
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I always got Neil to supply a heavier flywheel to avoid these problems Tony.Aussie Paul.
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Neil Supplied me with a flywheel for my EJ200 box on my 2.5 as well.
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Go the heavy flywheel and the gearbox should be nice and smooth.
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yeah thanks guys. it was never supplied with one and has been designed with out.
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are you saying you got your gearboxes direct?
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When you say it"s designed without, your sort of right but the flywheel bolts direct onto the crank and isn"t in the gearbox.
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I am going back a few years but the first gearbox and and flywheel I got for an ej-22 was from Neil when he was still at Sub4. The alloy flywheel was unsuitable and I asked Neil to supply me with a heavier one, which he did, and I was very happy after that. FWIW I believe that a too light a flywheel eventually does enormous damage internally to an engine.
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dean, yes it just has a ring gear and thin plate for the ring gear which bolts onto an ally adaptor then to the crank. the do-nut bolts onto the thin plate and then the
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I purchased an autoflight G/box from Neil last time I was in Hamilton at least 4 yrs ago, and He didn"t mention a fly wheel. When it came time to build my Kruser cabin gyro I remembered all the problems with the rotax G/box on the ea81 with no flywheel so found an ej22 flywheel, machined the crap out of it, machined a ring-gear area, fitted the ej25 ringear and tapped threads in the cast iron flywheel for the drive. (Tim McClure gave me the confidence to do all these things years ago) Spun it with the air gun with a bearing in the hole and to my supprise there was no viabration. The whole system has done 4 hrs test flying and works beautifully. Sadly I can"t test it any more as Iv"e been locked out of the local airstrip. One of course requires a decent strip for test flying.
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dean, yes it just has a ring gear and thin plate for the ring gear which bolts onto an ally adaptor then to the crank. the do-nut bolts onto the thin plate and then the
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Yep, before I had a flywheel in my ea81, I used to crack an expensive drive dougnut every 50 hrs. and the G/box would move on the plate. I agree, with a G/box the prop. is no longer a flywheel, cause it"s no longer on the crankshaft.
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ok i was to take it up this weekend but it will now be put on hold, i"m sure with my luck some thing will go pear shaped, one of my origanial questions was can i use steel plate grade 250. i"m thinking by the time i check and modify an existing flywheel it might be easier.
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ok the i went out and pulled the auto flight off again. the steel plate is cut for the flywheel machining,
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new flywheel update, about 1 month ago i got the flywheel machined and sent away for balancing. went and refitted it to my machine. i took it up, very nervous too i might add, which i always think is a healthy thing. all very smooth and every thing seemed good. one thing i noticed thou. it seemed heavy on the stick to push over to the left. this concerned me a bit because i can"t remember it being like that 3 months earlier. i was concerned about the control rod ends being tight even thou i check them in my preflight. i stared to wonder and my question is , is that any thing to do with a heavier flywheel. at say 4200rpm than the lighter one spinning at the same speed .the torque i mean. is it constant once you have left the ground remembering my new gearbox spins a bit faster and i have changed the pitch from 17 degrees back to 14 degrees. or because of the heavier flywheel do i need to alter my horizontal stab or ???????????????? i"m not able to work that out.i only did 30 min above the strip. i checked all the controls and rod ends when i landed again and there is definetely nothing wrong there .once again any help would be greatly appreacated.
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