2 degree twist on longeron

[PrescottB787]

On page 29-3 the plans call for a 2 degrees twist on the longeron. With an angle measurement tool I can barely see two degrees let alone measure it once the twist is done. Any suggestion?

[rv7charlie]

What tool are you using? FWIW, most smart phone systems have free angle finder apps available that will resolve in tenths of a degree.

Another option is to do the trig calc for that angle over a significant distance (say, 12"), and measure linear distances. Similar to what many kits specify for setting wing angle of attack using a long straightedge & measuring height difference between leading & trailing edges.

Charlie

[rotoiti]

Originally Posted by rv7charlie

... do the trig calc for that angle over a significant distance ...

This is exactly what I did, and it worked out great.

[mciaglia]

I used a digital level. They get pretty accurate up to .1 of a degree.

[IMG]Untitled by mark ciaglia, on Flickr[/IMG]