Hello everybody,
in order to finally get a real idea of the size of such a
Propel Motor in my
scale (1/160), I have tried just for the fun of it to scratch such a motor from plastic, and have quickly realized what a midget it is.
For the base body of the motor I've used an
Evergreen profile 4,8 x 6,3 mm, which I've cut on the narrow side with the precision saw on
approx. 5 mm.
Then I've drawn the octagonal shape of the motor housing onto the front side,
and afterwards I have filed down the four corners, whereby I had to be very careful not to take away too much.
On this
approx. 7 mm long octagonal base body I have glued on the two
disks (part 3) for fixing the
retaining plate (part 5) for mounting the brake shoes of the
brake disc (parts 9/10).
Source: Micro Artwork, Mischa Klement (cyana)
Then it was the turn of the front
brake disc shaft and the rear
drive shaft.
For the retaining plate I've used
Styrene 0,15 mm and for the brake disc
Styrene 0,3 mm,
which were then glued, as well as the two rear
ventilation openings (part 33) and the
cable box (part 35) on the inside of the (left) motor.
The ending was formed by the four small
feet (parts 20-23) made of
Styrene 0,15 mm, which were glued to the underside of the base body, wherewith I then wanted initially let it go at that.
And there he lies now, the (unfinished) proud midget that I fiddled around with for a few hours,
the one with
approx. 14 mm length has place on my
Euro Cent coin,
and whose brake disc with
Ø 5 mm, as already announced, stands comfortably on the globe of the coin.
Here one can see for comparison the
original Propel motors in the older version, relevant for my
STS-6 Crawler,
Source: Library of Congress (HAER FL-8-11-C-3)
as well as here after upgrading and modernization of the Crawler Transporters for the
SLS Program, which can be easily recognized by the stronger blue brake shoes.
Source: NASA
Because I now know the amount of hand work involved in crafting one motor,
I hope all the more that we can get right a printable 3D model for a
Set of 16 + 2 reserve motors.
