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Old 12-21-2007, 03:02 PM   #1
Lone Rider OP
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2wd

Is Ural the only choice for 2WD?
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Old 12-21-2007, 03:06 PM   #2
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Quote:
Originally Posted by Lone Rider
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.
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Old 12-21-2007, 03:06 PM   #3
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No, there are some custom shops putting out 2WD.
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Old 12-21-2007, 03:09 PM   #4
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Quote:
Originally Posted by DustyJacket
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.
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Old 12-22-2007, 05:47 AM   #5
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how 'bout 3wd?

If you're gonna go custom, why not go for threed wheel drive?

http://www.2wd.nl/
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Old 12-22-2007, 09:01 AM   #6
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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.
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Old 12-22-2007, 11:20 PM   #7
zenben
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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.
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Old 12-23-2007, 03:01 AM   #8
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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.

http://www.mobec.de
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Old 12-23-2007, 01:06 PM   #9
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Quote:
Originally Posted by AceRph
Their website says a lot of other stuff. I can't read German.
http://www.mobec-international.com/index.php
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Old 12-23-2007, 01:36 PM   #10
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Wow. 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.
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Old 12-23-2007, 02:11 PM   #11
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Quote:
Originally Posted by larryboy
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?
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Old 12-23-2007, 03:49 PM   #12
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Quote:
Originally Posted by larryboy
Wow. 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.
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.

Left side?
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Old 12-23-2007, 05:12 PM   #13
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Quote:
Originally Posted by Lone Rider
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...


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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.
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Old 12-23-2007, 05:22 PM   #14
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Quote:
Originally Posted by gyroforce


I can read that!
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“We are turning into a nation of whimpering slaves to Fear—fear of war, fear of poverty, fear of random terrorism, fear of getting down-sized or fired because of the plunging economy, fear of getting evicted for bad debts or suddenly getting locked up in a military detention camp on vague charges of being a Terrorist sympathizer.” —”Extreme Behavior in Aspen,” February 3, 2003

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Old 12-23-2007, 05:23 PM   #15
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Quote:
Originally Posted by Frank Warner
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...
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.
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