Re: IRS defined (not tax related)

[Robert Wilkinson <wilk@domain.elided>]

I have followed this thread with interest.  While I have no comment on the
issue of IRS "purity" with or without swaybars, etc., I submit that the
main advantage of IRS is a favorable sprung/unsprung weight ratio (see
examples below).  With this criterion in mind, De Dion is almost as good as
IRS, while giant I beams, etc. are not.  Fred Puhn makes this point in his
book on handling:

solid axle:  3.54
De Dion: 4.00
IRS:  4.55
De Dion, inboard brakes:  5.66
IRS, inboard brakes:  6.69

(all rear suspension with coil, not leaf, springs)

Note that this is a duplicate of an earlier post in which (sorry) I failed
to enter the subject line.

Bob Wilkinson
72 Spider
64 Corvair conv.
72 Jag XJ6
00 Audi A6
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