W&B Envelope

[jefferts]

I have a skybolt I bought (I didn't build it). It's an old one with short gear if that makes any difference. I have a W & B sheet that I got with the aircraft, but I am about to install a new propeller and tailwheel. Seems like a good time to weigh the plane and make a new sheet. My question is what does the "official" W&B envelope look like and what's the datum? (It seems that the firewall is the datum on the one I have, but its not 100% clear.)
Thanks in advance for the help!
Steve

 

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