Well, given that i have 0 flight experience with the Byron f-16, you can get a copy of the manual from here

http://www.houstonhobbies.com/jets/b...6/byronf16.htm

but it states that it should be 3 1/2" 3 3/4" ahead of the engine former for the first flights.... this is where the spar is so it conflicts with what Dave Presta's experience is..... i'm in the same boat as i just finished setting up the tailerons and rudder and am up to setting the CoG

Thanks

dave