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A built Vario MD 900 kit (by Vario)
The real thing in UK Air Support Colours
October 7, 2009
How the days fly when your having fun...
I am now doing what I suspect is the hardest part of this
build, which is trying to "dry" assemble the various parts
of the NOTAR system. The tricky part is that you really do
have to ensure that the inner tube down which all that air blows is
centred perfectly in the main boom, and then fixed in there
solidly. The Vario Documentation simply shows three or four
screws holding it, which is definitely not going to be sufficient,
as the entire rotating tail cap is supported on the inner tube.
My plan is to use the special poly....... ring provided to
let the outer case slid neatly and smoothly to serve two purposes,
one to let the inner end of the tail casing slide on it, the other
to lock the inner tube securely into the boom. This is going
to mean locating and fixing this ring 1/2 way into the boom in such
a way that it cannot possible move, but will still give sufficient
support for the tail housing as well.
 |
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| The results
of today's efforts gluing and grinding and sanding. My arms
are quite sore after this lot.
Top left, the internal
part of the NOTAR with the curved F/G air duct fixed at the
bottom, but not yet at the top. This will help the air
from the fan curve out toward the vent you can see at the
bottom right. The hole you can see at the bottom is for the
servo to stick out through the F/G sheet.
The top right picture
is the outer tail cone alongside the camera/searchlight ball
that is nearly ready for final paint and fitting in to it'
housing.
The bottom right
picture is of the middle part of the boom assembly where
lots of important parts are mounted solidly at the right
point in time. You can see the support woodwork fibre
glassed into place. |
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Basically the entire NOTAR system will be supported by this
piece of the boom, which is then in it's own turn to be fitted to
the main boom in such a way that it can all be stripped down if and
when needed, such as replacing the tail servo which is buried right
down at the very back of the tail, and lubricating the tail cone so
that it continues to slide nice and easily.
The boom has also been finished to the exact length needed
to mount the NOTAR, and sanded and primed, so maybe soon I will be
able to assemble this lot into something that will really work &
control the tail as per the prototype. 
In fact, the only real difference between the Vario system
and the real thing is that on the real thing the air is pushed down
to boom tube by a large fan mounted that pushes it directly down,
and thus creates a spiral of air, which helps to get it out of the
ducting at the back.
October 8, 2009
Been pretty busy today, what with going to see a Bone
Doctor about my poor ole hips, and then moving forward with the
MD900 build 
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