In October 1944 it conducted field tests of two M-73, one had a engine valve side M-72 series production and another had a engine experimental upper valve "M-75". The main feature of the machines was that they had a drive of wheels of a sidecar differential, and the aim of the test was to see if such a design was reasonable in practice.
Also a series of masses M-72 participated in field tests for comparison. As a result, the traction to the wheels of the sidecar no differential is considered impractical, although the machines did not have a bad performance out of the way.
After the war, the project M-73 was returned and the tests of the machines improved is carried out again in the years 1947-48. None of M-73 survived until today.
Seventy years later, a team of restorers from Riga, Latvia, made a copy of the motorcycle by using design schemes that were left.
The motorcycles were built at the request of the Museum of Motorcycles in the name of V. Sheyanov, Samara.
Prototype IMZ И7Д (I7D)
The prototype И7Д (I7D) was created by IMZ and was based on M-72, also sometimes referred to as the M-73, but it differed in that, in addition to the traction on the sidecar, saw the introduction of the gearbox the speed reducer. that significantly increased the performance and stability of the bike in terms of road muddy.
The I7D remains a prototype and is on display in the museum in Irbit.
The motor M-75 was further developed for racing sports. Today it is a machine very rare. This was restored by Aleksey Popov. M-75 is made 1947-1951. An improved model M-75M was made 1952-1954.
There was another motorcycle heavy soviet-made sidecar with drive to the wheels, the TM3-53, 1942, a gigantic 1000 cc with frame and gearbox surprisingly similar to that of a BMW R75. For now, just a couple of photos of TMZ-53, you will find more information in other pages of these pages.
KMZ Dnepr also produced wheel-drive models of sidecar as the MT-12 and MT-16, although these models used a ratio of the power transfer of 70/30 to the rear wheel and sidecar.
The Urals modern are available with a 2WD snap optional for those sticky situations.
Sources of information:
Max Rodin, Alexey Popov, Steve Wiggins, Encyclopedia of Russian motorcycles, YouTube, files B-Cozz