Datum position of the firewall for an RV-7

[eddieseve]

Hi Guys

Could someone tell me what the datum position of the firewall is relative to the Vans specified datum of 70 inches forward of the wing Leading Edge?

I am trying to calculate the difference changing the weight of my battery will make.

Cheers

[Neal@F14]

Take a tape measure along the outside of the fuselage from the leading edge of the wing to the firewall ( or wherever the center of your battery lies) and subtract that measurement in inches from 70 and then you've got the "arm" value you need to calculate the W&B adjustment for your new battery. I'm about to do the same for my RV6's new battery.

edit: Google for the "Aircraft Weight and Balance Handbook" by the FAA for a pdf of a good booklet for doing W&B calculations. The knowledge in that book works equally well south of the equator too :-D

[eddieseve]

Thanks Neal

I was hoping someone might have the info available, I won't be out at the airport till Saturday, otherwise I would not have asked the question :-)

Cheers