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Post by David Lawson on Jun 11, 2012 11:47:07 GMT -5
 This is a slot car I built in 2006. I used the A Russell-Black drawings from Model Cars magazine and a Profile Publication booklet by William Boddy as references.  This was the early stages of the carving.  Here are the various moulds and resin casts of the components  The shell prior to trimming but with the detail pieces removed from the sprues.  The very simple chassis I built and the completed shell.    A few views of the finished car  A screen grab from the DVD that Mac Pinches produced for Earlybirds 50 in February 2007 where my Napier Railton and Dave Jones Birkin Bentley had a bit of a dice on the practice day. David |
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Post by Mark Huber on Jun 11, 2012 12:00:28 GMT -5
David,
That book title wasn't an error was it.. 24 litre and not 2.4!
Very nice build.
Thanks for posting.
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Post by David Lawson on Jun 12, 2012 8:52:59 GMT -5
No Mark it is a 24 litre aero engine.
David
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Post by Mark Huber on Jun 13, 2012 13:19:06 GMT -5
That is a big car.. it appears to dwarf the Bentley. Did you race it at Early Birds or was the picture just used as a promotional piece by Mac?
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Post by EM on Jun 13, 2012 21:15:21 GMT -5
24 L it was! If you look at the exhaust manifolds (all three of them), they appear to be six branch manifolds or a total of 18 cylinders.
A displacement of 24 L among 18 cylinders yields 1333.33 cc per cylinder or very near the entire displacement of a half tonner engine in each cylinder.
Now these big aero engines did not rev very high – perhaps 2500 RPM but just think about starting and stopping a considerably larger than half-gallon piston/cylinder combination 40 times per second.
Makes one think, what?
EM
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Post by Mark Huber on Jun 14, 2012 10:10:40 GMT -5
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Post by David Lawson on Jun 14, 2012 14:07:19 GMT -5
The car had a Napier Lion aero engine that dated back to 1921, it gave 564bhp at 2,350rpm on a compression ratio of 6 to 1 and a maximum of 590bhp at 2,700rpm. The team declined the opportunity of installing either the 1927 Lion engine that gave 875bhp at 3,300rpm or the 1929 Schneider Trophy version that gave 1295bhp
He generally ran the car between 2,000 and 2,200rpm and holds the outright lap record at Brooklands of 143.44mph.
I've no information about 0-100 figures as the car was a long distance machine and I dread to think what the braking figures were like as it only had rear wheel brakes...
Out of interest to those of you in the USA, this car was driven at the salt flats in Utah in 1935 to a 24-hour world record of 137.40mph and an hour record of 152.70mph.
I often see the car when I visit Brooklands and have so much admiration for John Cobb's ability and bravery at taming this giant.
David
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