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Celebrating the products of AEC Southall Ltd, most famous as builder of London's buses.

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PostPosted: Tue Nov 03, 2015 6:57 pm 
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Joined: Tue Jan 24, 2012 4:44 pm
Posts: 171
Dear All,

In the 1964-66 period there was a rash of UK designs for twin-steering tractor units; of these LMC ended up getting three to the launch stage; the Scammell Trunker II, The Leyland Frieghtline Steer and the AEC Mammoth Minor. After the 1966 show some sense prevailed and the Leyland was dropped, as LMC had two competing UK sales outlets at the time it gave both a product in this sector.

However, a source I've read says that the Mammoth Minor had unchanged steering geometry from the eight wheel Mammoth Major; whereas Scammell adjusted the ackermann angles of the Trunker II as compared to the Routeman. If this is the case wouldn't the Mammoth Minor have suffered quite a bit of tyre scrub?

Yours curiously

Stephen Allcroft
Cardross
Scotland

PS apologies to Cole Porter for the title.


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PostPosted: Fri Nov 13, 2015 4:53 am 
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Joined: Thu Jan 19, 2012 8:40 am
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Stephen, The Minor was twin steer at the front,same as a MM8.The Trunker,on the other hand, was twin steer with the second axle just in front of the drive.i.e. wider spread between the steer axles and so requiring slightly different geometry from the Routeman which was twin steer at the front,and similar to the MM8.


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PostPosted: Fri Nov 13, 2015 4:28 pm 
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Thank you for that.


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PostPosted: Sun Nov 15, 2015 8:15 pm 
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Joined: Wed Jan 11, 2012 7:29 pm
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:lol: Clever title to this thread!!


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PostPosted: Mon Nov 16, 2015 9:09 am 
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Joined: Sat Jan 14, 2012 10:24 pm
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On the face of it this would seem to be a strange thing for AEC to have done on a vehicle capable of 60mph +. The angles would have been originally related to the mid point between the two driving axles. Even the shortest 8 wheeler would have had a mid point longer than the distance to the drive axle on the Minor 6. Are all the relevant inter axle linkage part numbers the same? In practice the difference for the AEC (twin steer) would not have been great, however for the Trunker (rear steer) it was very considerable. A modern rear steer tractor unit's second axle does not apply very much lock at all.


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PostPosted: Tue Nov 17, 2015 12:58 pm 
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Joined: Tue Jan 24, 2012 4:44 pm
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Thanks CAV551, my thoughs on the matter comply with yours, there would be a mean centre on the major 8 between the two rear axles, and that would produce different steering geometry to the much shorter wheelbase of the minor. Still it would take the part numbers to prove the allegation, perhaps AEC felt the minor was not worth tooling up new parts for.


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