Tony,
You might bring the pitch back to 19 deg. and see if it goes
away. I'm running 19 deg. (with a 912S) and get only 5700 on climb out.
You may have too much pitch. You might start at 18 deg first and then go
up in 1 deg. steps. I also have a Mono-
Jim
N15JN
writes:
> <tony.bale@virgin.net>
>
> Folks,
> We have just completed the first 2 1/2 hrs of ground
> engine running (912S Warpdrive @ 21deg XS mono) apart from a couple
> of starting problems which we think are fuel related, the only issue
> which we are concerned about is a vibration / resonance at 3200 -
> 3300 RPM.
> Could find nothing loose, re-torqued the blades and had a good poke
> and push around with all the bits and pieces, anyone any ideas /
> experience ? We have spent considerable effort in reducing throttle
> cable drag and balancing the carbs.
> The rev band the resonance occurs at is very specific, and goes as
> quickly as it starts, very consistent and repeatable, however the
> engine is smooth at all other speeds.
>
> I must say being a spam can pilot I was very impressed (not to
> mention releaved) at how controllable the aircraft was on the ground
> in some cross winds and up to high taxi speeds on grass
>
> Yours with blurrrrrred vision
>
>
> Tony.
>
>
> PS, I think CKT will be releasing an exhaust mod to prevent the
> manifold pipe (left rear) cracking some people have experienced.
> Also they were unaware of the tail pipe falling off some owners have
> experienced, they are developing a better clamping device.
>
>
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