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>> No.1664969 [View]
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1664969

So ive performed some new test-fires and it still isnt self-sustaining.

I suspect its either the bearings or my balancing of the shaft is not good enough so ill rebalance it. With normal steel bearings properly lubricated with oil jet using car engine oil (viscocity at 40C 82.8mm2s-1) im only getting up to speeds of 8800rpm with oil and 10500rpm without oil. Ive tried replacing the bearings and changing the blade geometries at the back but that hasnt worked.

Thinking of getting full ceramic bearings now. Probably ZrO2 with a PTFE cage. This is mainly because they have lower rolling friction and dont require much lubricant under low loads as I will be using.

Opinions on this?



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