On Jan 15, 8:57*am, "Dan Marotta" wrote:

Really, how accurately can you measure 2.9 inches, mark it, and cut it?

I think that just on the far side of 2-7/8" would do just fine.

...it looks like 100:2.9 is an angle of 1.6618 degrees. *Will a
digital level get that accuracy? Is that accuracy really necessary?

Most digital levels will offer repeatable measurements to 0.1 degrees,
and I think that that is close enough. In this case I'd feel fine
about a reading of 1.7 degrees. For my fuselage, the exact tailboom
slope is 1.213 degrees, but 1.2 or even 1-1/4 degrees would be fine.

What's the good of a parallel surface if it's not accessible? *Why not make,
say, the arm rest parallel to the longitudinal axis? *Then you could simply
place a carpenter's level on the arm rest and, voila!

Thanks, the armrest trick is a good idea, I might adopt that; it would
be useful for people who have digital levels that beep when they're
actually level.

Thanks again, Bob K.