Heavy equipment transporter
Commercial Heavy Equipment Transporter (C-HET)
1977 - 1992
United States - Oshkosh
At least 1.722 M911 built when production ceased
- UNIT COST
Limited production costs
Good mobility and speed on roads
Ability to recover vehicles using winches
Moderate reliability in off road use
Cannot transport loads over 60 t
The M911 CHET is a Cold War era heavy equipment transporter of US origin. It was acquired in the mid 1970's as a more capable and lower cost alternative to the M746 HET that had been developed only years earlier. The name CHET stands for Commercial Heavy Equipment Transporter. The design was bought of the shelf in order to keep the costs as low as possible and to start production as soon as possible.
The M911 is based on the commercial Oshkosh F2365 truck. This model was modified in a number of areas. Two winches were added behind the cab. The US Army models feature a lift-up non driven fourth axle located in front of the two rear axles. The M911 is a soft skin vehicle and does not feature any armor or other protective measures.
The M911 was to be used with the M747 trailer. That trailer was developed in the HET-70 program alongside the M746 tracktor truck that the M911 supplements. This combination allows for 60 t loads. Heavier loads such as the M1 Abrams cannot be transported. In foreign service other trailers are used with the M911. Most are capable of 50 or 60 t loads.
The M911 had better mobility than the M746 it was designed to supplement. The huge Detroit Diesel 450 hp diesel engine allows for speeds of 70 km/h on roads. The speed on dirt roads and offroad is much lower. When used in difficult offroad conditions or with loads exceeding 60 t the reliability of the M911 proved to be limited.
The M911 was acquired in quantity by the US Army and Saudi Arabia. Many dozens have been exported to various US allies. In US service the M911 was replaced by the M1030 HETS in the early 1990's. The M1030 is capable of hauling heavier loads and has a better offroad performance. The M911 remain in use in various nations around the world.
The M911 HET is a Cold War era tank transporter based on a commercial Oshkosh tractor truck. It can be easily identified by its distinctive 1970's cab and very large bonnet. The M911 is used in combination with the M747 four axle 60t trailer.
- M911 CHET
|Type||Heavy equipment transporter|
|Crew||1 + 2 (driver, 2 passengers)|
|Height||3.18 m (cab roof), 3.40 m (overall)|
|Weight||18.1 t empty, 39.5 t GVW, 102.5 t GCW|
|Wheelbase||Wheeled chassis, 6x6, 5.21 + 1.52 m wheelbase, 14R 24 tires|
|Turn radius||13.7 m (without trailer)|
|Engine||Detroit Diesel 8V92TA-90 V8 water-cooled 2-stroke diesel, 450 hp at 2.100 rpm|
|Power ratio||24.9 hp/t empty, 4.4 hp/t at max GCW|
|Transmission||CLBT-754 automatic, 5 forward, 1 reverse|
|Speed||72 km/h on road at max GCW, 23 km/h on 3% gradient|
|Range||1.344 km on road, 990 km at 86 t GCW at economic speed|
|Gradient||20% gradient at GCW|
|Remarks||2x 20 t winch, 5th wheel for trailers|