Hello fellow aviators!
One of the things that helped me to understand this pitch change thingy
was to have Ian Williams remove the prop spinner and show me the little
centrifugal latch that holds the prop in cruise pitch.
From this I could see the approximate amount to pull the lever to give
the latch room to move outwards. Also, I realised what I was trying to
make happen, rather than blindly following a procedure for which I
didn't understand the reason.
I can see that if you increase the pitch too much (pull the lever out
too far) this reduces the rpm, which makes the latch less likely to move
outwards. Also, if you start with insufficient rpm that would also make
it less likely to move.
A further item is to check that the latch itself moves freely. A squirt
of CRC or WD-40 is what I use on mine. It needs to flip back and forth
quite freely. If it has been greased, or is running very dry, or has
grit or dust in it then any of these could make it more reluctant to
move into cruise mode.
It's a neat little mechanism really.
Cheers
Martyn
--
Martyn Cook
New Zealand
> On Sat, Oct 13, 2018 at 6:53 AM Jarek Steliga
<[email protected] <mailto:[email protected]>> wrote:
>>
>>
>> Hello,
>> I am quite new here (have owned Dimona for only 3 months).
>> Despite scrupulously folliowing the instructions regarding the
required RPM-s of between 1800 to 1900 at which the propeller pitch
is changed from START to CRUISE in midair, I have only succeedded
twice despite numerous attempts. Also pulling the pitch lever in the
cockpit results in scary vibrations which discourages me from
continuing my trial and error methods. Can someone please help?
>>
>> Best regards
>> Jarek
>>
