On 7/11/2022 10:44 AM, Craig Williams wrote:
So I went and re-measured my ARMs this am, emptied the tanks and put her on scales.
Datum is 48" ahead of the firewall. So all measurements were taken from the
firewall and 48" was added.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Is the aircraft perfectly level when reading the scales? If you are
using 48" forward of the firewall as the datum then your CG range
should be 48" + distance from firewall to lead edge of wing + 8" to
14". If aircraft is not level your scales will not read correctly.
Don't forget you removed the weight of a nose wheel setup in the
repair. That will cause the CG to move aft some amount. Never, under
any circumstance, fly the airplane to see if the CG range is acceptable
without knowing the accurate CG and that it is within the range
specified in the plans. You can slowly test for aft CG handling a bit
at a time later in the testing. Your first flight is to determine if
the aircraft is controllable and the engine is reliable. Detailed test
come later. I know of at least one member on the net that had an aft
CG on the first flight. As them how much fun that was. If you numbers
indicate an aft CG condition, make sure the numbers are correct and fix
the situation before first flight.
Larry Flesner
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