From: Patrick Jankowiak (eccm@swbell.net)
Date: Thu Jun 12 2003 - 09:33:42 PDT
Speaking of 'no batteries', Stewart and Stevenson has a new military
truck which has an electric drive, and a 400KW generator attached to
the engine. It uses no batteries, but instead uses 'ultracapacitors'
also known as supercapacitors, which have very high capacitances. The
rep told me that you start the truck off of the charge stored in the
caps. On top of that, if the truck is dead, you can start it from 13 D
cells. I thought this was preposterous until I did the math. 13 amp
hours per D cell. 780 amp-minutes. No you can't take this directly
from the cells, but after the cells discharge themselves into the
capacitor bank, it spins the diesel just fine. Their video shows the
truck driving up to an electrical outbuilding, and being connected to
power runway lights. 400KW 3 phase power and a big bad cargo truck.
(DROOL!)
Jim Newton wrote:
>
> Hi All...
>
> A while back I saw a write up on an experimental HMMWV being evaluated
> by the military that was fitted as a hybrid...electric generator
> connected to the diesel engine, and a powerful electric motor at each
> wheel.
>
> Since there were no drive lines or drive axles, all four wheels could
> mechanically steer, and they could steer really tight...all the way to
> 90 degrees each way! This was great for parallel parking!
>
> The really cool part was that it could also pivot about its center
> like a tank by reversing the motors on one side and forwarding the
> motors on the other. It just spun right around with the wheels all
> pointed straight!
>
> I believe it had the same standard 6.5 diesel engine connected to a
> generator instead of the transmission and transfer case. No batteries
> were needed that I can remember, so the weight was comparable to a
> standard HMMWV.
>
> I just looked on Google and found this one, but I think it is
> different than the one I saw but similar specs:
>
> http://www.pei-idt.com/hmmwv1.htm
>
> I don't see anything on GL right now. ;)
>
> >> But seriously, whether somebody has tried it or not, it might be much
> >> easier to do on a HMMWV than on the typical truck, because the rear wheels
> >> are already mounted on ball joints with CV joints on the half-shafts, and
> >> are held in place by adjustable radius rods, which could hypothetically be
> >> attached to some sort of steering mechanism instead of directly to the
> >> frame. Maybe a hydraulic steering cylinder, slaved off the front steering
> >> system in some fashion, would be a way to do it.
> >
> >My point exactly. And thinks about the reduced turning radius and diagonal
> >parking. I've seen a movie of a hmmwv with 4ws at www.amghummer.com, but
> >that seems to be a "2 steering wheels" implementation.
> >
> >Now that some of the new GM trucks have 4WS, I would imagine there'd be some
> >newly-inspired interest in it.
> >
> >Vadim.
> >
> >
> >===Mil-Veh is a member-supported mailing list===
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>
> --
>
> Jim "Ike" Newton
>
> o 1984 M1007 CUCV Military Suburban
> 6.2 Liter (378 CID) Turbo-Diesel Engine
> 5/4 Ton Cargo Capacity, 4WD
>
> o 1971 M35A2 Military Troop/Cargo Truck "Deuce and a Half"
> 478 CID Turbo-Diesel Multi-Fuel Engine
> Air Shift Front Axle
> 2 1/2 Ton Cargo Capacity, 6WD
>
> See These Trucks at www.CUCV.NET
> Keyword Searching of 22,000 Electronic TMs at www.MILDOCS.com
>
> ===Mil-Veh is a member-supported mailing list===
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> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
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