Here are some "off the cuff" thoughts, which could be developed into
something more serious:
Taking the concept of an H4 as the basis, make the roll bar a permanent
feature integral with the chassis and attach it also to a metal front screen
frame to form a permanent total roll cage to which the rear folding screen
could abut rather than to the targa top. This gives the basis for a far
more rigid / safer frame and the possibility of windproof seals for the
doors and windows. The frame could also be extended rearwards to take a tow
bar rather than having to bolt one to the boot floor. This approach would
allow the use of a smaller diameter tube along the sides (the current 6"
tubes are there to provide the requisite stiffness for an open car), which
would compensate for the extra weight elsewhere. This is starting to look
rather like a Cobra frame but would solve a lot of the safety problems
associated with passing IVA that I encountered with my Beauford! Seat belt
attachment is now required to be through at least 4 mm thick steel plate at
least 100 mm wide or 50 mm square tube - not that I could find it written
per se in the IVA manual but had to achieve to get a pass. What one might
term as an overkill to achieve an underkill?
The front frame should be narrower to allow the unrestricted use of 15"
wheels without the need for wheel spacers and the inner front wing space
should be larger to avoid tyre rub when on full lock and full suspension
travel - yes there are roads that create this situation around here!
Attachment of the fibreglass to the frame should be such that the sections
could be removed (to check for rust!!!) else treat the metal so that it does
not rust before bonding to the fibreglass, such as zinc plating, but not
powder coating, which in my experience always lets in water and promotes
rust under its surface. How well does fibreglass bond to zinc?
Hamish
----- Original Message -----
From: "Eddie" <[email protected]>
To: "Quantum Owners Group" <[email protected]>
Sent: Wednesday, October 06, 2010 10:54 PM
Subject: [Quantum Owners] What would you design.
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