On 28 Dec 2007 at 10:47, M D Nugent wrote:
> - a 2" reduction of free length will result in a 2" drop in ground
> clearance, and...
For any given weight, the loading within the spring is the same
everywhere. Regardless of the free length (and assuming a linear
spring), if the spring compresses an amount X and original length Y,
that compression will be linear within the spring. If it compresses
a fractional component Z = X/Y, then the new length will be shorter
by Z times 2in, not shorter by 2in.
To put it an other way, you must distinguish between the compression
modulus of the coil as a material and the effective compression
constant of the actual spring as a unit. The effective spring
constant is the compression modulus (dimensionless w.r.t. length)
times the spring length. If you shorten the spring its effective
rate goes up so a given load compresses it less that you'd expect.
> - reduction of front weight by 40% would require a spring with 40%
> lower rate for "same as stock" performance.
Wow! How does one reduce the front weight by 40%? Install a 2-
cylinder engine?? Cut the Spitfire engine in half, factor in the
lightened frame, suspension, and brakes, move the battery to the
trunk, remove the alternator, lights, horn...
--
Jim Muller
jimmuller@rcn.com
'80 Spitfire, '70 GT6+
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