The only web page dedicated to the US Army XM-571 / CL-91 Dynatrac.
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    		• About the XM-571 / CL-91

    I have gathered two articles that deal with the XM-571 / CL-91. These are barrowed articles from the sites listed at the end of each article. Please do not use these articles with out getting permission from the original site.

    While not "armored", the XM-571 Cargo Vehicle is an interesting "jointed" or "articulated" cargo carrier that has excellent flotation over difficult terrain. As shown here, it is light enough for air transportability both inside and under the CH-47 "Chinook" helicopter commonly used by the U.S. Army in Southeast Asia.

    With power provided by a modified Chevrolet Corvair six cylinder "pancake" engine in the front, or driver's unit, the XM-571 may be equipped with either one or two "trailer" units, which receive power thorough a flexible shaft which couples the unites together. This "coupling" shaft is sufficiently flexible to allow the trailing unites to conform to every fold of the terrain and still transmit power. While the "trailer" units carry the same registration numbers as the driver unites, they are interchangeable between different XM-571's for greater flexibility of use

    -http://www.twislotshop007.com/cargo.htm


    The Dynatrac (CL-91)
    The CL-91 was a multi-terrain, high mobility tracked vehicle consisting of two or three units connected by articulation joints which permitted displacement of the units up to 30 degrees from the centreline in any plane. A single 65-bhp General Motors Corvair air-cooled engine drove all units.

    The CL-91 could travel at up to 50 km/h (30 mph) over snow, mud and muskeg; and, thanks to its relatively lightweight construction and 20-cm (8-in.) freeboard, it could swim at 3 km/h (2 mph) with a 900-kg (2,000 lb.) payload. In deep snow, with a full payload, it could tow 12 ski troops or an 1,100-kg (2,400 lb.) toboggan, and negotiate a 60 per cent grade and a 40 per cent side slope.

    Of a total of 63 Dynatracs produced, 57 went to the U.S. Army, two each to the Canadian Army and the British Army. Two were used as test vehicles.

    -http://home.ca.inter.net/~rapickler/vehicles.html