Basing of necessity of joint motor and cross-country vehicle (JMCV) manufacture
Nowadays on conditions of lack of good roads mainly we use crafts on air cushion (CAC), caterpillar cross-country vehicles and wheel cross-country vehicles on doughnut tyres.
Basic lacks of such cross-country vehicles:
Impossibility or difficulty of moving on the motor roads of general-purpose.
Low economy because of heavy operational casts
Caterpillar cross-country vehicles are faulty, especially in regions of Western Siberia and Extreme North.
From operation experience wheel cross-country vehicles also have low flotation on the soft ground (bog) and deep snow, and low speed (5… 10 km/h).
Caterpillar and wheel cross-country vehicles meet problems for moving in water and need placing of special water engines and operating system
Joint motor and cross-country vehicle on air cushion (JVAC) excludes all above mentioned lacks and excels CAC on many items: speed 60 km/h and more, ecological cleanness, economic, rough-terrain performance (water, bog, snow), and exclude such lacks as directional and lateral instability, specially if it`s windy or snowy. Also JVAC excels CAC in speed on general-purpose roads what is 80 km/h and more.
Attempts of producing similar machines as «Terraplan» were taken in France by Berten Company in 1961-1971 and in Latvia by the Riga Institute of civil aviation «Aerojip» in 1987.
Tumenecotrans made a pre-production model of JVAC in 1997 and excluded all lacks of CACs with using of drive wheels. In 1998-1999 Tumenecotrans successfully held JVAC `s running and ground tests on motor roads and lack of roads. At that the vehicle experienced operational development and test of different variants of design solutions, for example, by soft barrier type: snowy and «skirt», by method of air injection into AC space: using fan blower and by air bleeding from mid-flight propeller facility (MFPF), and by quantity of MFPF (one or two).
Tests showed that more efficient for fully loaded mass of JVAC in 2 tons was use of snow scheme soft barrier, use of two fan blowers and two MFPF. At that elastic inflatable pneumatic ski was set on the floor of body along the full its length. Rear wheels were driving from motor engine which also provided который также обеспечивал fan blowers drive during the movement along AC.
Everything mentioned above helped to move easily in deep snowdrift, water and on the motor roads. On the base of drawn tests Tumenecotrans offers to introduce this new JVAC into production run.
Otherwise if there is a necessity of less speed on conditions of lack of good roads (10… 20km/h) with simultaneous increase in carrying capacity, there is an opportunity to realize a variant of JMCV with removable chain tracks instead of wheels. At that there is a chance to replace AC by pneumatic ski with air smearing. It will let greatly simplify the construction in comparison with JVAC, also decrease noise, installed power per employee and accordingly fuel consumption. Model of JMCV is showenbelow on the picture.