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I use Bekra16 all the time.
Have 2 Hypers, one flown for nearly 10 months, no problems
The other flown less than 20 flights, and already have had to replace
the rear bearing,
I have done a lot of homework on this subject, and have found some interesting ideas on anotheRR forum which shall not be mentioned.
There is a theory that putting a very slight preload on the rear bearing will prevent premature failure. The theory of the failure is that in some engines the loads on the bearing are quite low, which causes the balls to "skid" in the race causing premature failure.
The recommendation is to try 2 shims (the thickness of coke tin) between the crankcase and rear bearing.
I have done this on my rebuilt engine, and am currently testing.
So far have had about 10 flights with no problems at all.
Pete
Have 2 Hypers, one flown for nearly 10 months, no problems
The other flown less than 20 flights, and already have had to replace
the rear bearing,
I have done a lot of homework on this subject, and have found some interesting ideas on anotheRR forum which shall not be mentioned.
There is a theory that putting a very slight preload on the rear bearing will prevent premature failure. The theory of the failure is that in some engines the loads on the bearing are quite low, which causes the balls to "skid" in the race causing premature failure.
The recommendation is to try 2 shims (the thickness of coke tin) between the crankcase and rear bearing.
I have done this on my rebuilt engine, and am currently testing.
So far have had about 10 flights with no problems at all.
Pete
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