Gas-powered Motorcycles

Gallery opened 2 Mar 2020

Updated 28 Mar 2020

More on the gasbike
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This idea for running motorcycles from coal gas (town gas) which contained hydrogen, carbon monoxide, methane, and ethylene, surfaced towards the end of WW1, when petrol shortages were starting to bite. It's clearly a very unwieldy set-up, and whether more than one example was made is uncertain.

Left: Motorcycle with a gas storage bag attached to the sidecar: 1917

The gasbag was made of fabric, presumably made gas-tight by some sort of coating, probably rubber. Its capacity was allegedly 600 cubic feet. The fabric was restrained by external cords and a conical plate on the front stopped the front of the bag being blown inwards at speed. What sort of speed would be possible with a large amount of asymmetric drag is hard to estimate.

Note the supply pipe running from the bottom of the gasbag to the engine. The drawing looks like it was derived from a photograph, so apparently at least one of these outfits was built.

Some gas-bikes are being made today, running off propane as conversions from petrol bikes. For example Greenfly.

A chap demonstrates his LPG motorbike on YouTube.

And there are instructions on how to convert your motorbike using the MagicGas equipment on YouTube.

Thanks to all those who sent me gas-powered motorbike links.

Image from Popular Mechanics for Nov 1917, p641

I have received this assessment of the idea from Mr J Kreutz, to whom thanks:

"The gas powered motorbike would be rather dangerous: I evaluate the area of the gas container at about 2 mē. that means that with a lateral wind of 25 metre/s (not even 100 km/h) the drag might amount about 750 Newtons, the same force as the one exerted by gravity on a mean motorbike driver. Furthermore, the ratio of cantilever lengths of the center of the gas container, the hight of the motorbike seat, the length of the foot of the driver and so on let me suppose that this vehicle might have been rather dangerous and probably undrivable by bad weather conditions (wind gusts)... I consider here lengths by reference to the contact points of the tires with the road. I ride myself a motorbike (not methane powered!) and gusts with a speed of 100 km/h are still manageable, but require a lot of care of the driver... I cal also suppose that speed above 30-40 km/h might have been problematic."

Having pondered the issue, I too have concluded that this machine would be uncontrollable in any sort of side-wind.

Left: London bus with a gas storage bag on the roof: 1917

The American gas motorbike was inspired by the use of gasbags on London buses; Note the supply pipe running from the bag to the engine.

The placard on the front of the bus roof reads: "Eat Less Food" which does not sound as if it would help civilian morale; I suspect the artist may have made that up. The other placards are not legible. That there were food shortages is in doubt; see here, which a includes poster exhorting people not to waste bread. There is another good site on WW1 food shortages here. There were certainly posters saying "Eat Less Bread".

There is an excellent site on gasbag vehicles here.

Image from Popular Mechanics for Oct 1917

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