Questions asked and two halves joined
Lionel gave me a call and inquired on a few things on the build that I had not covered.
So here a a few answers to cover those questions that others may be wondering about.
When planking the fuselage I was in somewhat of a rush, trying to get the
model completed for last years Black Eagle PSS Event, which in the end proved
somewhat futile as I now enter the 350 hour mark, more or less, on this build.
So I chose Cyno to attach the planking. This done by applying the planking to the
4 “corners” of the structure first, much the same way you would tighten up a wheel
on a car. This was to ensure that there was no torsional pull to left or right,
specifically in the tail area.
Then I worked back to the center of each quarter and cut planking to
suit the ever diminishing plank width closest to the tail and nose.
Some would argue that cyno is a more brittle bond than wood glue,
but it is quicker, and at that stage is what was required from a time point of view.
The very best solution would probably have been to glue and pin the planks to the structure
and leave overnight to dry as wood glue will have a wee bit of give.
I applied the wood to one end of the formers at the fuselage join,
applied cyno to each of the stringers as I cam across them
and then finally wicked cyno into the joints lengthwise.
Once the lightfill was added and the elbow grease applied with 80 grit sandpaper,
the cyno joins quickly disappeared.
With the structure not being too much of a curve, the 20mm x 2.5mm planking bent
very nicely over the curves so no need to wet the wood as the cyno held the balsa well.
So now to the joining of the two halves, the wing saddle and the wing fairings
Two halves joined together for look and feel
Staring down the ass of the beast
Wing saddle area covered with 1mm ply, to take the shape as created by the formers
Note the bolts holding the two halves together
Rear saddle area added and holes drilled for the wing bolts to attach
to the pre-0attached claw grip bolts in the fuselage.
Two front ones still to be done. One invaluable lesson I learnt
from Steve who has been building for years, is that sometimes
an electric drill can be your worst enemy…
so my preferred method of making holes nowadays is to take a hollow
brass or aluminum tube of the right diameter, sharpen the opening
with a fine file and then use a model knife to make small “teeth” in
the sharpened end. Use this to rotate your way through foam, balsa and thin ply,
and walla, you get neat, controlled openings/holes just where you require them.
No muss no fuss and most of all looks neat.
Just couldn’t see getting this thing into a drill press!
Finally, the two sides joined with epoxy and the bolts on each side of the fuselage
and joint sanded in with lightfill to cover the join. Believe me, you can hold this by the tail
and wield it like a baseball bat, it’s that strong.
The fillet for the wing fairing being formed onto the 1mm ply that was
sticking out from the wing saddle in the last photo. Solid balsa at the front, planking in the middle…
and these solid balsa back fairings that lead to the wing trailing edge.
That took some serious work and reference to the real thing to work out
Literally hours on each one….
and there we have the wing fairings/fillets prior to lightfill and completion
More and more like the real thing, fillets sanded in and complete
Tuna! and that’s all till next post