hi Richard, Interesting idea. To my mind, in a roll over with a cage with floor mounts, the loads would be transferred in a direction generally along the cage legs, and distributed over the mount area normal to the legs in a compressive manner. Because the majority of the load transfer to the rest of the car would be in this manner, the affixing bolts arent put into tension or anything, and so would do little more than locate the mounts, and maybe some shear transfer due to force transfer not being directly along the cage legs etc.
However, in the same rollover scenario with vertical mounts, the force transfer from the cage to the car will be in shear as you pointed out, but limited by the capabilities of the bolts. Remember stress=force/area; a fat man lying on a bodyboard probably has more chance getting across a frozen lake than a small lady wearing high heels, because her small weight is distributed over tiny areas. In the worst case the transfer would only be through the combined small cross sectional area of the bolts (high stress concentration), best case would be this area plus some of the mount area (again limited by the bolts putting the mounts in tension). Just my thinking out loud - anyone got any views? Andrew On Fri, 5 Jul 2002, Richard Clough wrote: > Can anyone think of a reason why roll cage mounting brackets could not be > installed vertically along the inside of the door sills rather than on the > floor? > > My idea is to make a long mounting plate and weld it to the inside of the > sill, or inside the sill cavity when the outer sills are replaced. This > would allow for the forward bars in the footwell and the centre hoop to be > mounted off the bottom of the wall rather than to the floor. > > My feeling is that these vertical roll cage mounts would have some > advantages. They would be stronger than floor mounts in a roll over, as the > forces would be shear forces rather than flat fronted forces on a thin metal > floor pan. The full length side bars would stiffen the body. There are no > bolts protruding under the floor getting damaged, and no problems fitting > carpets or concealing holes in the floor if the cage is removed . > > Comments on this idea? > > ----- Original Message ----- > From: "James Morrison" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, 5 July 2002 12:30 PM > Subject: Re: roll cage in 1600, pedal locations > > > > my mates 1600 rally car has a full cage and stock pedal and yeh its pretty > damn close to the cage, could get annoying. You may wanna think about a > bluebird (i think) pedal and cable accellator. > > > > James > > > > --- JUSTIN FRIEDRICHS <[EMAIL PROTECTED]> wrote: > > >Guys, > > >Do you need to modify the position of the acc pedal > > >and brake pedal when a roll cage is fitted to a 1600. > > >Cos I think the cage legs need to be very close to the > > >acc pedal. > > > > > >Cheers > > >Justin > > > > > >http://www.sold.com.au - SOLD.com.au > > >- Find yourself a bargain! > > > > > > > _____________________________________________________________ > > Get Your free Ozdat Email Account > > ---> http://www.ozdat.com > > > > _____________________________________________________________ > > Promote your group and strengthen ties to your members with > [EMAIL PROTECTED] by Everyone.net http://www.everyone.net/?btn=tag > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
