On Aug 6, 2014, at 9:06 AM, Roger Stockton via EV <ev@lists.evdl.org> wrote:
> Ben Goren wrote: > >> Very interesting! That exact design won't work, as I'm keeping the V8 -- >> but the basic geometry is very similar to what I have in mind. > > Understood; I was thinking that it might be easier to modify the combiner > output shaft to be double-ended so that one side attaches to the tranny > output and the (shortened) driveshaft attaches to the other, possibly with > the torque combiner bolting right up to the tranny much like some transfer > cases do. I'll have to think about that. Again, my initial thought is just to put the pulleys on some sort of custom-machined shaft that sits between the transmission output and the U-joint. >> Any chance you can tell me if I've at least got the right order of >> magnitude? If so, I'm not going to worry. Even if it only has a 10,000 >> hour lifespan, that's still over half a million miles at freeway speeds. > > Sorry; I'm an EE, not ME ;^> And I'm neither! > I suspect that it is not just the static load of the belt tension, but the > tension added to one side of the belt/chain when the motor is delivering > torque. That was my initial thought, too...until late yesterday evening when I was doing a bunch of research on it. And, if I'm understanding it correctly, all that putting a load on the system does is move the direction of the force, but not its magnitude -- and for a reason that makes sense: when you pull on the one side, you increase tension on that side...but you also _decrease_ tension on the opposite side by the same amount. So, instead of the (say) ten pounds being applied towards the axle of the opposite pulley, the same ten pounds is now applied on a different angle. > I would not use the peak torque load, but the typical cruising condition I started with that, but also figured that it wouldn't hurt to get pessimistic with the estimation. If even the worst-case scenario is acceptable, I should be in good shape. b& -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: Message signed with OpenPGP using GPGMail URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140806/beea463a/attachment.pgp> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
