And as poor Doug may well not be up with the acronyms

the SDDG4, sometimes refereed to as a SD4, is a prototype Shaft Drive version of the DG4, itself a Double Geared improvement of the Super Sentinel. The DG's and everything earlier were chain drive.

They brought in the numbers in about 1927 when they brought out the DG6 6 wheeler.

Its an interesting thing, basically the DG cab layout with the boiler out front, but what is basically an engine like the later 'S' types but fitted the other way around. So 4 cylinder single acting engine, rather than a 2 cylinder double acting engine like the earlier waggons. Obviously with 2 gears as the DG and later S

I seem to remember reading that at least one of the prototypes (probably a 6 wheeler) had what was basically a DG engine turned through 90 degrees, very like how Fodens did shaft drive with the Speed wagons.

Indeed it is - the corner of our old living van is just visible to the left of yours Bob.
I remember the Sentinel coming to the rally.

On a low loader as I recall, not common for a Sentinel at that time

Actually it wasn't that uncommon, there was plenty of talking a good run, then as now, but many Sentinels were owned by hauliers back then so transporting was fairly easy, I remember an event in Suffolk around 1981 with about 10 Sentinels only 2 of which steamed both there and away, mind you 1 was grounded on site by a tube going.

Thanks Hedd, you are right in that I am not that familiar with the intricacies of Sentinel production, just the generalities. I have not seen it before so I thought I would ask.


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Some more shots of the same Standard at Bishops Castle rally's See what or who you can spot please

athttp://www.tractiontalkforum.com/pic...ictureid=26996

http://www.tractiontalkforum.com/pic...ictureid=26995

http://www.tractiontalkforum.com/pic...ictureid=26993

http://www.tractiontalkforum.com/pic...ictureid=26994

Images from a very fine set of slides sent to the Society archive has anyone got any they would like to donate or let me scan
please