[AT] British Steam Tractor - WWI

[John Maddock]

Hello Charlie

>From one of my snouts in England:

"Catching them after the roundabout on pause shows its a Holt crawler and
googling "bovington tank museum holt" found this from a local to them
paper-

http://m.bournemouthecho.co.uk/news/11412285.Spot_the_gun_tractor__First_World_War_convoy_set_to_roll_across_Dorset/


The low loader looks like its a twin steer but they seem to be using it
with the rear bogie locked in the straight ahead position so the second
engine can only really push on the A frame- maybe the drivers were not
confident enough to steer/swing the it around- it would be bad enough on a
conventional truck to steer and control the throttle, but on a traction
engine with two "drivers" it would need considerable skill to read one
anothers minds and not over-egg the situation??

The front engine seems to start bucking just as she is pulling the bogie
round and I suppose those solid rubber/cast wheels can't deflect like
later pneumatic tyres so it must be a case of dragging each sideways a bit
as she turns, plus maybe the pusher up behind wasn't giving it as much as
he could to help??

rgds Peter"

JV

> John,   The reason I think that is that my pickup truck
> has a locker differential and sometimes when the
> wheels spin and the differential locks it then doesn't
> unlock as quick as it should.  When that happens the
> rear of my truck does the exact same thing when I turn.
> For example,  I'm coming out of a wet field, not in 4wd,
> and the rears spin.  The locker locks up but I immediately
> have to turn onto the paved road.  I think the truck needs
> to get up to 5 mph or so for it to unlock.  So when I turn out
> onto the road the rear end binds up and jumps and spins
> until I get straight in the road.
>
> Charlie
>
> -----Original Message-----
> From: John Maddock
> Sent: Saturday, March 21, 2015 10:07 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] British Steam Tractor - WWI
>
> Very good point about the diff Charlie. Had not thought of that.  I agree,
> unlikly to be one; probably one side (both sides?) chain drive.
>
> JV
>
>
>> John,  I'm thinking that bounce is a combination of torque and
>> wheel slip as I suspect that rig is pretty much "positive traction"
>> meaning both rear wheels turn together.  It might have a differential
>> in it but I doubt it.  Maybe someone here knows?
>>
>> Charlie
>>
>> -----Original Message-----
>> From: John Maddock
>> Sent: Saturday, March 21, 2015 6:57 PM
>> To: Antique tractor email discussion group
>> Subject: Re: [AT] British Steam Tractor - WWI
>>
>> Fascinating!  Especially the torque bounce of the lead traction engine.
>>
>> Also curious about the crawler.
>>
>> JV
>>
>>
>>> Leroy, Thanks for this video! Also enjoyed the following one "WW1
>>> narrow
>>> gauge railways in France" This is why I enjoy our site!   Joe
>>> HardiskyÂ
>>> Ryman Farm Dallas, PA
>>>
>>>
>>>      On Saturday, March 21, 2015 2:04 PM, LeRoy <lep3 at ptd.net> wrote:
>>>
>>>
>>>
>>>  I thought this was an interesting video that was passed on to me from
>>> someone at work and thought I'd share it with the group.  Not sure
>>> what
>>> make the Tractors are.
>>>
>>> https://www.youtube.com/watch_popup?v=huQhqXiB8O0
>>>
>>> LeRoy
>>>
>>>
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>>
>> It is good to have work.  It is even better to be *able* to work
>>
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>
>
> It is good to have work.  It is even better to be *able* to work
>
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It is good to have work.  It is even better to be *able* to work