Page 6

Misc pics

Here is a pic of the steel root-rib and the rivet spacing. Print shows 1 inch vertical spacing on the 1/8th inch SS rivets, and 1/4 inch spacing from edges of steel ring and alternating the 2 rows accordingly. This spacing must be caculated and then laid out on spar as the measurement cannot be made after the ring is inside the spar tube. no rivets are placed in areas where the inside steel ring has fillet welds, which are at the 3 and 9 oclock position.

Rear boom tube ring and empennage assembly is attached with 3-16 rivets at a wider spacing, with a total of 8 rivets, 4 on each side called for. In below pic you can see a temporary AN bolt inserted in one of the upper holes. This assembly will be removed now that the rigging is done for a coat of epoxy primer on all chrome-moly parts (green)  

Ring inserted flush with boom tube

Above I have treated the Boom Tube with an alumadyne conversion coating after using a acid etch to clean it up. This will give a good base for the 2 part epoxy to adhere to. Directions call for a 5 to 7 min. soak and then wipe clean.

Here is the cage after 1st coat of 2 part epoxy primer. BEWARE...you need a good respirator to avoid burning your lungs with this stuff. How good the ventilation you have does not matter..This stuff is DANGEROUS. If you are going to use a top color coat of Aerothane...or another 2 part paint with polyisocyanides in the activator, you may as well get a remote supplied air right away, because there IS NO FILTER//RESPIRATOR that will protect you from this stuff. DON'T FOOL AROUND HERE, These chemicals will damage you lungs before you can spray a half a cup from a HVLP gun, and in the first sniff you get from a conventional Binks style spray gun.  I experienced this almost 18 years ago! Ask me how I know!.(or ask my doctor)