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Unread 07-10-20, 08:03 PM
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WHere to find stations for nose and main gear

Hi all,

If I'm reweighing my Skymaster, where do I find the stations for the nose and main gear? I can't find it in my 1970 T337E manual anywhere.

I found the W&B for the last time my plane was weighed. It had the most bizarre formula. It was

87 - (NGW x 96) / GW + 65 = 137.08

That's my published c.g: 137.08 inches.

There's no mention of where the 87, 96 or 65 came from.


NGW = nose gear weight, 500.0 lbs
GW = gross weight, 3218.0 lbs.

Can anyone explain this?
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Unread 07-11-20, 01:45 PM
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I found the answer, though a combination of the Skymaster repair manual and a set of Piper instructions on how to weigh a single engine plane without published stations for the gear.

65.00 is the station of the firewall, from the Skymaster repair manual.

87 is the measured distance from the firewall to the ground contact point of the main gear.
96 is the measured distance from the ground contact point of the main gear to the nose gear, parallel to the longitudinal axis of the plane (aka "wheelbase.")

Neither the 87 nor the 96 have any fractional components, so if the weighing was sloppy it's possible that my c.g. could easily be off by an inch, maybe even more.

BTW, If you have a cg app for the skymaster, put in a c.g. of 137.08 and a GW of 3218. You'll notice you can't carry full or empty tanks with two 170lb occupants in the front seats. You're out of c.g. forward in both conditions - that's what made me think my c.g. was wrong. It doesn't fly like a super-forward c.g. plane.
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