Other Engines

Jensen Model 75

During the early 1950s the American manufacturer Jensen produced the meths (alcohol) fired model 75. This was the only meths fired engine ever put into full production by the company, most of their engines are electrically heated, and was only included in the Jensen product line for a fairly short period. Apparently Tom Jensen Sr. had concerns over the safety of meths fired engines and it was withdrawn. Such was his concern that he is said to have destroyed a number of model 75s over the years, as and when he could get hold of them.

Unusually for a Jensen engine of the period there is no chimney, the model 75 was never fitted with one. The distinctive vertically mounted double-acting oscillating cylinder re-appeared later on the Jensen model 70, an electrically heated engine that is still in production.

Sadly the original burner is missing, but I have a photo so I can make a replica, interestingly it is very reminiscent of a Bowman burner. Normally I steam the engine with a spare Mamod SE3 burner and it runs like an absolute dream.

Peake Engines No.3

Australian Ben Peake makes a range of interesting engines. The Peake N° 3 is particularly unusual as it makes use of the “Sun and Planet” gear instead of a conventional crank.

The “Sun and Planet” was patented in 1781 having been designed by William Murdoch, a talented employee of Matthew Boulton and James Watt. The story goes that Boulton and Watt intended to use a crank to enable a beam engine to provide rotary motion, however, the design was leaked by an employee and was patented by another party. To avoid the patent Boulton and Watt were therefore forced to find another mechanism to perform the role of a crank.

The "Sun and Planet" Gear works well and has a curious property of rotating the flywheel twice for every cycle (assuming the number of teeth on each gear is equal).

Crescent

Crescent Horizontal Engine No.1

Crescent toys were based in Cwmcarn, South Wales and in 1947 added steam toys to their range. These engines were manufactured in Japan by the Kuramochi Company, also known as CK Matsutoko.

The “Horizontal Engine No.1” was not a commercial success, although cheap these engines were made from very thin, lightweight materials. There were also questions over the design of the burner which had a combined filler tube and handle, the burner was prone to catching fire! Only about 1000 were made, production ceasing in 1948.