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1. 07:07 AM - Re: IDLE RPM (lucien)
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Ok, thanks gents for the info.
I kind of figured the shutdown procedure was down in the noise of other factors
like the prop. For what it's worth, my 912ULS originally had a 3 blade IVO medium
on it which was a significant concern for me from day one. Fortunately, the
pitch change mechanism quit working right one day and that finally gave me
an excuse to get that monster off there.
It weighed so much I literally had to redo my W&B once I fitted my powerfin, which
was just under 10 lbs lighter! It was like dropping an anvil off the back
of the plane....
I did try a Warp Drive 68" on my plane first, but had to abandon it due to a harmonic
vibration problem that had nothing to do with prop itself. But even the
Warp Drive was like a feather compared to the IVO and the engine was much happier
below 2200 rpm with the WD than the IVO. And Daryl has told me that the WD
meets the MOI limits of the 912 gearboxes in probably all diameters. For sure,
my 912 ran/idled normally (that I could tell) with my WD fitted to it even
with a 3" extension.
When I did my GB preload check a few months ago it came out right in the middle
of the acceptable range, so I think I got the IVO off there in time ;). But there's
just no comparison in how nicely the engine idles and runs in general with
the Powerfin vs the IVO.
So the monster prop thing is definitely a contributing factor, IMO....
LS
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LS
Titan II SS
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