Thanks Jeff, Larry, Mark, Dan for all the good advise. Since I don't yet know
where the engine will be mounted, my best choices for the datum are the
firewall and a point some distance out in front of the prop independent of the
spinner. Calculations I have run using the later have yielded acceptable
results. I am going to re-run the calculations using the firewall datum and see
if they match. As a bit of info on the temporary motor mount that I build, the
"tray" that supports the engine is six (6) inches longer than WW version. With
the tray being 3" closer to 3" farther away from the firewall, I should be able
to find a suitable location resulting in a fwd CG. I'll run the numbers and
publish the results.Pete
> Date: Sat, 2 Apr 2016 07:37:43 -0500
> To: krnet at list.krnet.org
> Subject: KR> C.G location,
> From: krnet at list.krnet.org
> CC: flesner at frontier.com
>
>
>
> Mark and Jeff are both correct in saying the spinner is not the ideal
> place to choose as a datum to calculate W&B as that point could
> change in the future and cause self induced errors. I was addressing
> Pete's concern that using the spinner was giving him errors in his
> calculations. I was simply saying that the spinner is as valid a
> datum point as any other point he chooses for his calculations as
> long as his measurements and math are correct. It does add a small
> factor of complication to the process as the arm increases with each
> movement of the engine but with minds like ours that should not be a
> major hurdle. I would also suggest that Pete pick a more appropriate
> datum for the future aircraft records. I used the forward face of
> the 5 inch prop extension on the 0-200 and that is noted in the
> aircraft log as well as the W&B sheet in the aircraft.
>
> Larry Flesner
>
>
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