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Discussion in 'Hacks' started by Lone Rider, Dec 21, 2007.
Is Ural the only choice for 2WD?
Pretty much, yes.
There is a similar model called Denper made in the Ukraine that has 2WD, but the factory is closed and they are not making new bikes anymore. Hasn't for a few years.
You could always take an old Ural or Dnepr and pop in a early 80's BMW R airhead engine. It does require some modidfcation to the Ural/Dnepr transmission.
No, there are some custom shops putting out 2WD.
Sorry. I thought he was referring to rigs that were already manufactured with 2WD, stock from the factory. My bad.
I supose anything is possible in a custom shop.
If you're gonna go custom, why not go for threed wheel drive?
I woke up this morning thinking of a way to build my own 2wd rig that can go faster than 55 MPH and here is this thread.
The R75 derivitave design of the Ural dates to the late 1930's.
Hardly modern, but probably durable. Without a limited slip, there is no use for it unless used on very loose surfaces.
I'll admit to never driving one, (soon to be remedied), but with 70 years of technological development to harvest, there surely must be a better way.
MOBEC Duo Drive
MOBEC Super Drive
This system has a reverse. The rear wheel is attached to and suspended from the sidecar frame.
Their website says a lot of other stuff. I can't read German.
Wow. :huh That is some nice stuff!! Seems overly complicated, but nicely done.
I think I'd go with a left side hack for a BMW and go with a small gear reduction electric motor for reverse if I was building my own.
Why Left side?
I think their setup cost is about 6 KLRs, no sht.
Wouldn't take long to burn up an elec motor in some knarly stuff, but I don't know sht about that.
Think you'd want a temperature sensor on the motor .. going back to the motor controller.. Even then the electric motor needs to be speed limited ... (you can get electric clutches .. so that can dissconect the eletric motor .. still leaves you with a reverse that way.)
Anyone know about using hydraulic motors ? I know the seals blow if the wheel stalls (stops) ... any other design considerations?
Left side is required in Australia for one. On the Isle of Man they get away with a right chair despite them driving on the left...
Other 2WD chairs .. go back to WW2 and bm made one .. possibly some others (Jawa?) too .. but my memory lets me down at the moment.
I can read that!
The temp sensor switched/controlled Warn winches used on our Mil vehicles blows rotten goat balls. You really, really don't want this kinda setup.
Hydraulics might be applicable for long-use winch operation, but not for practical vehicle drive. There's already a powerful gas motor on the rig. It just needs a reverse gear.
Easy to couple with the hub rather than some fancy thru the hub deal. It'd be easy to put a stub shaft behind the wheel and have the wheel hold it on and have a spud to hook the hack shaft to.
Jeez, only $10?
Something like a gear reduction high torque starte motor would be the ticket. Kick the bike into neutral and thumb the motor..2wd reverse with plenty of power..the nice thing about a hack is that there is room for a deep cycle. I've got a bazillion miles on a hack rig and have really only needed reverse a few times. Look at BeemerChef, riding all over without reverse.
Left side would couple easy with a BMW single sided swing arm.
I'll leave the lefty engineering to you. I ain't got a clue.
It depends on where you go. I'd install a winch on mine anyway. These are heavy fckers, especially with all the crap I'd carry with me. For me, there's no reason to have one and just run the streets. A roadable, highwayable 3-wheel ATV kinda thing that can carry a bunch of useless stuff I want to carry.
I won't venture into this black hole without some form of 2wd because I know what would happen. Also, I'd love using my '02 GS (needs new motor)as the driver, good power, air cooled, torquey, easy to maintain...and some other stuff. Needs lower rear gearing from an 80.
Yeah, an Optima yeller top or 2 onboard, good cooler setup, built in sleeves/tubes for the tarp poles, some kinda solar charging sht that jkam suggested...and some other stuff.
Way cool personal expedition vehicle, but...but....gotta be reliable.....
But still no limited slip.
A transfer case is old technology too. I'm thinking viscious couplings...
2WD on demand, on the fly, and through a LSD/reduction gearbox.