Re: Anyone need to run drawbar pull on their tra

Posted by El Toro on October 29, 2006 at 08:34:40 from (64.12.116.65):

In Reply to: Re: Anyone need to run drawbar pull on their tra posted by Hugh MacKay on October 28, 2006 at 18:20:39:

Hi Hugh, I forgot to answer your question on your Super A. We wouldn't have used the M7 for drawbar pull on anything that small. We had several smaller mobile field dynanmometers for medium and small vehicles. The M9 was the medium
and would hold a vehicle that would pull 20,000 pounds or less. It looked like a bus and it had the electric drive too. It was powered with a 500hp Ford gas engine and it had a Reo truck engine that ran the cooling fans and the power steering pump. We had a small dynamometer known as the M8 and it was a 1954 F8 Ford truck for use on small vehicles.

A rule of thumb for 4 wheel drive vehicles is that they should pull around 80% of their weight on drawbar pull.

The M7, M9 and the 3 big trailers all had chain drive. This was taken from the WW2 Recovery vehicle known as the M26 Draggin Wagon. The electric drive and the Ford engines were used in the T23 electric tank and were used on both the M7 and M9.

These vehicles were made in CA by a company known as the Knuckey Truck Co. They built the M26 during WW2 and were awarded a contract in 1945 after the war was over. Another company in Seattle WA known as Pacific Car and Foundry also built the the M26's since there was such a demand for them. You can see pictures of the M26 and the T23 by clicking on "Keyword" and typing in M26
or T23 Tank. I was told Mr Knuckey didn't have an engineering degree, but he must of had some good ones working for him. I think GE was involved in the electric drive since they had a contract on T23. APG bought a new heavy field dynanmometer known as the M18 in the late 70's and it was powered with the 1600 hp EMD engine
that was part of GM at that time. It would tow an M1 tank 45 miles an hour like it wasn't on behind. Hal

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