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klubko 11-06-2012 05:25 AM

New prop - periodic engine vibrations
 
Hi,
we've got a new prop (3-blade, fixed) and we have observed that the engine trembles slightly cca every 5 seconds. The vibration is very light and it's constant across all rpms. What might be the reason? Too small pitch? This propeller should be a copy of our old one, but probably not a 100%.
Many thanks for any insights!

Azzarac 11-06-2012 04:38 PM

Did you only begin to notice the vibration after changing the prop? Do you still have the old one? You may want to try swapping them back and see if that alleviates the problem. It's odd to occur thru the whole range of rpm.

PorFin 11-06-2012 05:35 PM

Re: New prop - periodic engine vibrations
 
Petr,

You may want to check your fuel delivery circuit, since from the description it sounds like something's momentarily interrupting the flow. Could be filters, could be an air bubble, could be something else entirely.

Just a thought...

trantor12020 11-07-2012 09:16 AM

Re: New prop - periodic engine vibrations
 
Cutlass bearing wore?

klubko 11-07-2012 06:06 PM

Re: New prop - periodic engine vibrations
 
Thanks all. Fuel should be fine. Cutlass bearing seemed ok, when I checked.


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