On 9/22/2020 5:32 PM, Flesner via KRnet wrote:
When doing a conventional gear aircraft and ,using the firewall for
the datum, all scales are in the same direction and no "negative"
numbers are involved.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I should have added that this is true when using scales but if you later
want to calculate changes using math then items forward of the firewall
datum will be negative numbers.
Here is a problem for math experts. If I put my KR on scales and pick a
datum forward of the aircraft (X inches forward of the main gear contact
point or the firewall) , and I determine the distance from that datum to
the desired CG location, add in the "moments" for given pilot, passenger
and fuel, and I know the weight and center of mass of the engine,
would that no leave a single unknown, the distance of the engine from
the datum, that would be determined with the formula? It seem that if I
know that I want my CG to be at X inches from the datum with the pilot,
passenger, and fuel weight given, then finding the single unknown ( the
distance of the engine from the datum would be answered. I'm thinking
that the answer to an earlier question would be yes, you should be able
to calculate where to place the engine.
The thing is you have to decide on several items. Do you want the CG to
fall at the rear limit with a 200 pound pilot, 200 pound passenger, and
full fuel or some other combination. Then you must insure the CG stays
in range with the other extreme of light weight pilot, no passenger,
minimum fuel, etc.
It's early and this may be all bunk. Someone verify or point out the error.
Larry Flesner
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