Gidday again,
For those in the early stages of construction I would like to offer a
painless way of locating exactly where the holes for the TP 13 bushes
should go in the tailplane root closeout. Sure you can butt the tailplane
up onto the pins and try and mark their centres but they have rounded ends
which makes them quite hard to identify their axis and therefore their
centre for drilling. From the hobbbyshop you can buy 1/4" diameter brass
tube which you cut into lengths nominally shorter than the Torque Tube
pins. Slide them onto the pins and push the tailplane home onto the pins.
Find a piece of offcut timber that will straddle from one pin location to
the other and rebate its lower side to go over the Torque Tube. Now
using your hot glue gun bond the brass sleeves to the timber offcut and
the offcut to the tailplane closeout. When you slide off the tailplane you
will have a perfect drill guide for your cordless drill armed with a 1/4"
drillbit. Drill through your brass tube guides and later crack off your
guide timber. Next get a piece of 1/4" white plastic ID tube supplied
---From the same hobbyshop and place it over your 1/4" drillbit removed from
your drill. Place it in your initial holes drilled in your closeout so
that it hangs loosely out of your tailplane , albeit it is angled
perfectly due to your previous setup. Rummage through your desk until you
come across an old pen that is nominally thicker than most, often it
will be a texta or marker, that has a 10 mm internal diameter. Your local
newsagent will definitely have one, plastic is the go. Spare this pen from
a life of suffering and give it a greater purpose in being. You will find
that the OD of the white plastic tube that is now sitting around your 1/4"
drill bit, is exactly the ID of your pen. Slide your trimmed down pen
casing over the white plastic spacer and hot glue it to your closeout. When
it has hardened remove the drill bit along with its white plastic spacer,
and drill down through it with a new 10 mm drill bit, and "Bobs your
Uncle"! Anyway this worked beautifully for me and a dry run found the
holes perfectly concentric with the tailplane pins.
Reg
Tony Renshaw
Builder No.236
Reg
Tony Renshaw
Builder No.236
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