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jacques maurel	10/04/2020 09:02:24
84 forum posts 20 photos	Videos for the quarantine: LINK LINK LINK LINK
Howard Lewis	10/04/2020 09:22:54
7227 forum posts 21 photos	W O Bentley used three eccentrics to drive the overhead camshaft on his engines, rather than chain, spur or bevel gears. Very ingenious! I had the opportunity to study drawings of a transmission used in a fairly recent tank. Very effective, very ingenious, and capable of transmitting reliably, (very necessary ) a huge horsepower.. But could I fathom out exactly how it worked? Not really! These gear trains are a far cry from the unsynchronised gearboxes of early vehicles. On my PSV driving test, I had to demonstrate that " the quickness of the hand, deceives the ear'ole" by doing a "snatch" change on a hill. The unfortunate drivers of WW1 tanks probably had to do something similar with their lumbering monsters. How they would have longed for devices like these!. Howard
duncan webster	10/04/2020 16:04:21
5307 forum posts 83 photos	That variable eccentric grabber arrangement is not new, I think it was Roy Amsbury who made a 5"g petrol loco using the same principle, described in ME back in the 70's. He also built a working 1/12 scale Deltic engine to power one of his locos. This raises him to supehero status in my book, the sort of chap who makes you think 'why do I bother?'
Hopper	11/04/2020 05:30:24
7881 forum posts 397 photos	The NSU Max motorcycle of circa 1950s used similar eccentric straps to drive its overhead camshaft. Quite successful but it never caught on. Just too uncoventional i guess.

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