http://www.driving-fun.com/forum/viewtopic.php?f=19&t=1336 There are some good images of the voisin with it's clothes off , this car is great there seem to be. Number of recreations good and bad ,which makes research problematic it's easier doing the jappic as there are less details available The last recreation I helped with was the deemster we only had four of five pictures to work from
Yes! That's the type of info I've been after. It's going to be difficult to stay on track with the three-wheeler project now. Thanks much . . . Mike
Indeed. The Reliant Robin springs (or rather, er, tumbles) to mind. Do you have the formula for RAC horsepower? Bore² x number of cylinders / 1613. I wonder how much influence taxable horsepower ratings actually had, though, as the tendency was for thoroughly undersquare proportions even in places where such taxation did not apply. The lead given by Pomeroy's late-Edwardian "high speed" engines was taken up by manufacturers outside the UK, but these generally persisted with long strokes. One might say that the advantages of lightweight pistons, compact combustion chambers, and a short, rigid block outweighed considerations of mean piston speed when "high speed" meant something between 2500 and 3000 rpm. It is remarkable then that Delage returned to an emphatically undersquare engine (55.8mm x 76mm) in 1926 for the 15 S8 racing car, which peaked at 8000rpm, after their ever-so-slightly oversquare V12 of 1923. Of course, mean piston speed at any given rate of rpm is a function not of the bore:stroke ratio but of stroke pure and simple. That is why very underquare engines can achieve silly crank speeds as long as they are small engines. The above Delage 1½-litre straight-8 has the same stroke as a Chevy 283 of over three times the capacity (or rev-happy 302) but probably less than 20% of the piston mass. Had it been a road-going engine the Delage would have carried a RAC rating of 15½hp, which was not extravagant, yet it was a perfectly rational design of engine. Its actual output was nearer 180bhp.
Here are 2 interesting GNat pics.Both from Shelsley Special.One show gauges at zero.The other with gauges registering.Here is some abbreviated information regarding GNat from John Bolster's book "Specials". Started build in 1925 by E.G. Sharp. Shortened and lowered standard G.N. chassis. Wider front axle. The engine is a mixture of G.N. engine parts and J.A.P. parts. 2.75 " ground clearance. 40mmSolex carbies Ignition by 2 single cyclinder magnetos G.N. single plate clutch this was the first car to run at Shelsley Walsh WITHOUT body work.Eventually it obtained the "KIM" type front sheet metal. No front brakes and only one rear brake. This was good enough to travel 1000 yards in 50 seconds up the hill at Shelsley Walsh in the RAIN.
The Jalopy Journal
