Estrella WarBirds Museum

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Estrella Warbirds Museum is one of the fastest growing museums in CA


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"Warbirds Over Paso" Air Show
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Armament & Ordnance


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Aircraft at the museum can be privately owned and on display, on loan from military organizations or belong to Estrella Warbirds Museum


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Welcome to the Woodland Family Automobile Display


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Note: In order to keep the displays looking fresh, some of the listed vehicles may be temporarily cycled out for maintenance, on loan, or to make room for other vehicles.

Missiles On DIsplay at Estrella Warbirds Museum


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Vehicles on display are frame up restorations. Got talent? We've got more to do.


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1942 Cletrac

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MG-1


Cletrac Towing Memphis Bell


The M2 High-Speed Tractor (HST) was manufactured by the Cleveland Tractor Company for the U.S. Army Ordnance Department. Termed an MG-1+ by Cletrac, 8,510 were manufactured during World War II, primarily for use on airfields as a tow tractor and maintenance vehicle. Powered by a 404cid Hercules WXLC3 engine driving a 4-speed transmission, the vehicle is capable of attaining speeds up to 22mph when the high rpm range is unlocked on the governor, allowing the engine to achieve 3,250 rpm. With the governor set at 2,500rpm, speeds up to 15 mph can be attained. Steering is accomplished through a Cletrac controlled differential that uses planetary gearsets to “downshift” one track when the corresponding steering lever is pulled. In this way, power is always being transmitted to both tracks making the steering action smoother and improving safety on steep slopes. Compared to the traditional “clutch and brake” steering found on most other crawlers of this vintage, the Cletrac differential has the disadvantage that it is not possible to lock one track and spot-turn around the braked track. Instead, the minimum turning radius is 10.5 ft. While this was a disadvantage for bulldozers, the controlled differential did prevent the tractor from tearing up pavement and turf, keeping the surface smooth for aircraft operations.


The M2 is equipped with a swinging drawbar designed for use in towing aircraft, as well as a second, swiveling pintle hook for towing ammunition, maintenance, & other types of trailers. Some testing was done to determine the suitability of the M2 as a gun-towing tractor, but it was quickly determined that it lacked the space to support the gun crews and carriage of ammunition and, as a 7-ton class machine, it was too light to pull the heavier howitzers and was eclipsed in this role by the M4 13-ton HST, M5 18-ton HST, and the M6 38-ton HST. However, with rubber tracks that were suitable for use on paved surfaces as well as grass and mud, the tractor performed well on the primitive airfields that were common in forward areas during the war.

For servicing aircraft, the M2 was equipped with a variety of equipment, including a 110 VDC 3 kW generator mounted on the right, front fender and a 2-stage, intercooled, PTO-driven air compressor mounted behind the operator’s seat. The compressor supplied air at 1,000 psi to an air receiver tank mounted on the left fender that had regulators & a booster pump to supply air at 1,500 psi, 1,000 psi, or 150 psi. The 150 psi tap was used for powering air tools, while the higher pressure sources were for charging the aircraft landing gear oleos. Likewise, the generator, which was driven off of a front-mounted PTO gearbox that also powered the 7,500 lb winch, provided the electricity to start the aircraft, eliminating the need for a separate “start cart.” The vehicle is also equipped with (3) spotlights—(2) forward, (1) rear—that double as driving lights, as well as blackout-type marker lamps.













As with most mass-produced items, several improvements were made over the production run. Later machines can be distingushed by the addition of a brush guard in front of the radiator, replacement of the early 2-cylinder, 2-stage air compressor with a 4-cylinder, 3-stage air compressor capable of producing 9.0 scfm @ 2000 psi, and a spring-loaded front idler instead of the manually-adjustable model on earlier machines.


Special thanks to Mark Van Klavern for all the photographs! This is the condition of the Cletrac as we received it at Estrella Warbirds Museum in August, 2011. Restoration will be done by a team of volunteers driven by the desire to preserve portions of our military history. The Cletrac is rather unique in that not very many of them were produced and even fewer survive today. Most have gone the way of the metal scrap pile to be melted down and forged into something new.


Cletrac
Weight:
13,500 lbs
Length:
166 inches
Width:
70 inches
Height: 68 inches
Ground Clearance: 19 inches
Tread: 52 inches
Contact Length: 63 inches
Ground Pressure: 8.5 psi
Max. Speed: 22 mph /16.75 mph
Max. Grade: 60 %
Trench Crossing: 5 feet
Fording Depth: 32 inches
Approach Angle: 45 degrees
Departure Angle: 41 degrees
Turning Radius: 10.5 feet
Engine: Hercules WXL C3
No. of cylinders: 6
Displacement: 404 cid
Bore: 4.25 inches
Stroke: 4.75 inches
Horse Power: 150 hp at 3,000 rpm
Torque: 312 ft-lb at 1,200 rpm
Governed RPM: 2500 and 3280 rpm
1st Gear: 2.37:1
2d Gear: 1.16:1
3rd Gear: 0.80:1
4th Gear: 0.49:1
Reverse: 1.92:1
Differential Ratio: 3.5:1
Steering Ratio: 1.8:1
Final Drive Ratio: 6.61:1
Sprocket Diameter: 25.468 inches
Max. Speed 1st Gear: 3.44 mph @2500 rpm
4.51 mph @ 3280 rpm
Max. Speed 2nd Gear: 7.05 mph @2500 rpm
9.24 mph @ 3280 rpm
Max. Speed 3rd Gear: 10.22 mph @2500 rpm
13.4 mph @ 3280 rpm
Max. Speed 4th Gear: 16.75 mph @2500 rpm
22.00 mph @ 3280 rpm
Max. Speed Reverse:

4.26 mph @2500 rpm
5.58 mph @ 3280 rpm

Fuel Capacity: 33 Gallons
Minimum Octane: 70
Width of Track: 13-5/8 inch
Track Pitch: 4 inches
No. of Pitches: 148
Clutch: 11 inch twin disk (dry)
Coolant Capacity: 37 Quarts
Compressor: Ingersoll-Rand Type 30 Model 41
Air Flow: 7.0 scfm @ 1,000 psig
Pressure Taps: 1,500/1000/150 psig 
Note: Later models had 2,000 psi air
Generator: 3 kW/27.3A/110 VDC
Winch: Gar-Wood 7,500 lbs
Max. Drawbar Pull: 7,500 lbs
Status: Currently under restoration
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