I have an impressive drill bit in my office. Diameter is 8mm (that is
0.32"), and length is... 2100 mm! (Yep, that is 82.7"!). Was made specially
for my KR2. Understand why?
The idea is: I am preparing to get inspected by the French authorities. The
French law makes no provision for an imported homebuilt, so I had to
persuade them that there would be no difference with a new project. They
agreed to give it a try, provided I find a way to make my spars inspectable.
So, the proposed solution, as suggested by our Austrian builder (Christan
Kogelmann), is to drill a hole along the spars, right in the middle of the
spar spacers, and inspect with a borescope.
Now, for those who didn't follow the story, I am now living in Tunisia, and
my poor KR is in France. So, I will have to take that drill bit along with
me when I go there. What is the airline going to say about that, I wonder...
Anyway, the critical thing is to drill those holes very straight, especially
in the aft spar.
My intentions are:
1 - Make two wooden drill jigs (wood blocks with a hole through them), one
for the front spar and one for the aft spar, matching the spars side
section;
2 - With wings removed, clamp the jig between the WAFs
3 - Starting with a short drill bit, slowly drill through the first spacers;
4 - Take the long drill bit, then finish the job.
Since I cannot see the aircraft, I checked the construction manual to find
the dimensions of the spars side section. When I add the spars dimensions
and the plywood, What I get is:
OUTER WING FWD
Caps Ply Total
H 7.28" (184.9mm)
W 2.031" (51.6mm)
OUTER WING AFT
H 4.03" (102.5mm)
W 1.03" (26.2mm)
Could somebody check these dimensions for me?
Serge Vidal
KR2 ZS-WEC
Tunis, Tunisia
E-mail: [email protected]
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