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A built Vario MD 900 kit (by Vario)
The real thing in UK Air Support Colours
October 5, 2009
Well, the day dawned fine and sunny despite
the forecast for all day rain, but as I went flying yesterday, I
felt I ought to get on with this project today.
I have progressed further with the
camera/search light dome as shown below :
 |
This is the
actual hollow balsa ball that is going to have small
recesses cut into it for the reflectors etc, and these will
(hopefully) be covered with protective clear celluloid. |
The work on the NOTAR stuff has also been progressing...
 |
Here is the
outer casing of the NOTAR tail assembly with the exhaust
vent cut and shaped, standing alongside the outer shell of
the camera / searchlight ball. This casing is going to
be removable via 3 screws for added safety.
You also see the true
colour the helicopter is going to be - Midnight Blue all the
way up to the motor covers, yellow above that. This
midnight blue is extremely close to the colour used by the
UK Air Support helicopters |
| Here we
have the internal part of the NOTAR tail drive system, which
is basically a fibreglass tube with one end blocked.
You have to cut out the rectangular vent, an also mount the
rudder servo in exactly the correct place on the rear face,
(as shown), to ensure that the entire outer
"tube" (as shown above) will be able to turn
freely and centrally when mounted to this servo. |
 |
 |
I have to
say that this proved to be quite a fiddly task, as you even
have to guess at the shape required for a piece of square
fibreglass sheet that is inserted inside this tube and has
to be shaped to deflect the airflow through the vent in the
side.
It takes a bit of
careful cutting to eventually get it down to the shape
needed. |
So, all in all, quite a successful day, with several parts
of the build moving forward at one and the same time.
October 6, 2009
Well, another wet day has dawned, so I want to try to
finish the Camera/Searchlight module today if possible.
However, although I have progressed with that, I got
waylaid with the NOTAR assemblies, and decided too press on with
that and get them into a fully working state, which I managed.
One of the problems with this section of the build is
getting everything as perfectly aligned as you can so that it will
work nice and smoothly. This means that servo you can
just see sticking out of the end must be positioned so that the
shaft is exactly centred on the tail cone. You then have
to use very strong adhesive to fix a circular piece of quite thick
plywood to the outside tail cone. This means mounting the wood
on the large circular servo horn, then drilling some screw
holes in the right place to hold it there while you leave the
adhesive to thoroughly cure.
If you get all of this right, and secure the inner tube at
the front successfully and of course, centrally, you have got a tail
system that should work just fine.
You will see that I have already painted the grille in the
NOTAR, as I will not be able to get at it very easily afterwards to
do so.
One comment on the design by Vario of the NOTAR system is
that in the event of a crash where damage ensues to this area of the
aircraft, it will be very difficult to repair, as although you can
disconnect the servo quite easily, you will be hard pressed to
remove the plywood former that is attached to the servo horn
wheel.
I suspect that you may have to pay for new
fibreglass tail parts if this were to occur, so the moral here is -
don't break the tail on these NOTAR
helicopters. 
I guess only time will show how well I am going with it so
far 
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