VINTAGE INDICATOR PERCENT MAC 721102 A130 PART #7B1688

Description

PART -
Vintage INDICATOR PERCENT MAC 721102 A130
We don't have the previous history of it and prefer to sell it "AS IS", "No return".
WL/139 AM/PC, Vintage R.A.F. Avro Vulcan B2A Altimeter indicator.
%MAC (Percent Mean Aerodynamic Chord) is a mathematical calculation that shows where the center of gravity is over the wing. The calculations is rather straight forward and the generic formula is the same for all airplanes. All one has to do is to figure out the numbers and plug them into the formula.
How is %MAC calculated?
Pilots, dispatchers or loadmasters will calculate the weight and balance with respect to the aircraft datum. Unfortunately, we need to change where the reference point is from the (datum) to the front of the wing called leading edge to mean aerodynamic chord (LEMAC). There is also a trailing edge mean aerodynamic chord (TEMAC) that is calculated. TEMAC - LEMAC = Wing width.
LEMAC and TEMAC are easy to calculate for straight wing aircraft. It is simply the measurement from where the wing starts and ends from the datum. For swept-wing aircraft it isn't that simple. As a result, aerodynamic engineers figure out where the average of the LEMAC by averaging the wing root and wing tip. The same process happens for calculating TEMAC.
%MAC is simply a calculation of how far the CG is from the LEMAC. If the CG is at the LEMAC, we can say it is at 0% MAC. CG at TEMAC means the CG is at 100% MAC.
In the picture below, we can eyeball the %MAC to be around 10% MAC.
Please take advantage of the zoom feature on the photos to judge cosmetics for yourself
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