This page created 03-04-2002 Last updated 10-11-2003
Changed Howard's e-mail address 08-13-2010
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Howard J. Thompson's
1/8 scale Sheridan tank
Click pictures for a larger view.
Photo 1001
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Photo 1002
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Photo 1003
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The above pictures taken at Ft. Irwin, CA on January 21, 2002
while visiting the Museum Curator Neil Morrison.
Photo 1004
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Photo 1005
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Photo 1006
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Photos of the original 'ARIZONA' in 1970 Vietnam. Plt Sgt Ramon B. Vega,
2nd Platoon, A Troop, 11th ACR was the TC of the 'ARIZONA'.
Photo 1007
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Photo 1008
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Hull under construction. Fabricated from 1/8th and 3/16th
5 ply aircraft grade birch plywood. Fiberglass and aluminum
sheet was used to reinforce all critical points.
Photo 1009
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Photo 1010
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Turret under construction. Fabricated by laminating 1/64th mahogany
plywood and 1/32nd thick aircraft grade birch plywood over a skeleton
of 22 shaped bulkheads of 1/8th birch plywood emanating as 15 degrees
from the center.
Photo 1011
Hull assembly with all suspension
components in place. Torsion bars,
shocks and idle wheel adjusters are
fully functional. Roadwheels are supported
by two ball bearings each. All parts
other than the hull are machined from
aluminum or steel.
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Photo 1012
Early hull and turret assembly in process.
Gun barrel is machined from aluminum as is
most other parts on the turret and hull.
Brass is used for some parts to facilitate
soldering hinges etc.
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Photo 1013
The bussel rack was fabricated from brass
channels and angles and steel security screen.
These large bussel
racks were fabrictaed 'in country' to provide
the troopers with much greater storage capacity.
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Photo 1014
The .50 cal cradle was machined from aluminum.
This photo gives some idea of the size differential
between full size and 1/8th size. That is a 6 inch
scale in the foreground.
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Photo 1015
The .50 cal armor shield was part of a M113 ACAV
Armor Kit and was adapted 'in country' to provide
some frontal protection for the Sheridan TC.
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Photo 1016
The rear deck is yet to be completed. The battery
cover houses the switch for the hull receiver. The
air cleaner cover houses the switch and charging
jacks for the main batteries.
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Photo 1017
Right side of turret showing cupola with the
side and back armor. The ACAV front shield sat
more vertical on the Sheridan than on the M113.
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Photo 1018
Left side of the turret with loader's hatch
open. In the hatch opening is the switch for
the turret receiver.
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Photo 1019
The front hull deck is incomplete as the flotation
surfboard is not in place nor are any of the
flotation barrier covers in place around the
top of the hull.
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Photo 1020
The operable flotation barrier step and the
fire extinquisher exterior actuating handle
can be seen in this left frontal shot.
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Photo 1021
All parts of the driver's hatch are machined
from aluminum. The hatch rotates on ball
bearings at the top.
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Photo 1022
Eventually there will be a driver in position.
Probably a TC up in the cupola as well.
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Photo 1023
The model is nearing completion, however, it
will probably be the winter of 03/04 before this
happens. The model was started in September 1997.
Nearly 4000 hours have been expended along
with many thousands of dollars for components
and materials.
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Photo 1024
The 204 track shoes are investment cast from
steel and then the track pin holes reamed.
Brass pins are used. The idlers and
sprocket drive axles are supported by ball bearings.
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Photo 1025
The dual range drive module operates on 24 volts
provided by two 7 amp hour sealed lead-acid
batteries. Steering, forward/reverse and
throttle are provided by a Vantec electronic
controller. Shifting between ranges is by a
standard servo. The final drives
are two .25 roller chain.
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Photo 1026
A 12 volt gear motor rotates the turret using
a .25 ladder chain. The driven sprocket is
fastened to the lower thrust plate that
sandwiches the hull flange to capture the turret.
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Photo 1027
The gun elevation is provided by a standard
servo and a slotted lever. The turret has its
own receiver and battery pack. Later a cupola
drive and sound cards may be added.
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The model is 31 inches long, 13 3/4 wide and 14 1/2 high over the .50 cal. It weighs 65 pounds. It travels at .65 mph max in Lo Range, which is equivalent to about 5 mph in the full size M551. It travels at 2.5 mph max in Hi Range, which is equivalent to about 20 mph in the full size. Although the full size had a max speed of 43 mph it would be very difficult to control the model when running at that equivalent scale speed. The model will operate for about 2 1/2 hours in Lo Range and about 1 3/4 hours in Hi Range before requiring battery recharging. It will climb a 60% grade in both Lo and Hi range. There is a receiver and antenna inside the hull, which controls the Vantec, the turret drive motor and shifting of the drive module. With a separate receiver and battery pack in the turret, sliprings between the hull and turret are not required.
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You can reach Howard Thompson at this email address:
hjtrcafv@charter.net
This page is currently maintained by
Jeff Sampson