Copyright Ian Wild

Potteries Motor Traction
1956
Daimler CVG6
Northern Counties L31/28RD

The above vehicle is one of a 30 strong batch delivered in 1956 – half with Metro Cammell H61RD bodies, the other half as shown.
These were delivered with Gardner 5LW engines and Twyflex Centrifugal Clutches (rather than the more usual fluid flywheels). Both features I suspect were down to the BET Group’s parsimony in relation to fuel consumption. The 5LW was never a match for the hilly Potteries area in these buses. Over the years, more than half were fitted with 6LW engines and one, H6656, even acquired a fluid flywheel as well. They were colloquially known as ‘Jumpers’ referring to their tendency to lurch when pulling away on an uphill gradient, something more common with the 5LW versions. Only three of the lowbridge variety kept 5LWs to the bitter end, L6664, L6666 and L6673. The photo was taken at Sandbach in May 1969 and shows Burslem (locally pronounced "Boslum") Depots L6676 on a Market Day extra from Hanley. Sandbach market was a popular attraction in the area in those days.

Photograph and Copy contributed by Ian Wild

A full list of Daimler codes can be seen here.

28/03/11 – 10:30

Apparently the Twiflex centrifugal clutch is still in production. To have lasted at least 54 years it must now be a judder-free product, though I know these things often depend on the installation. Fluid flywheels are reckoned to be only 96-97.5% efficient even at high revs/low load (where the engine itself isn’t particularly efficient) so I guess that allowing also for time spent in gear at traffic lights, with the engine on "heavy" idle churning the fluid round, the fuel consumption would be about 8% greater than that achieved with a clutch, whether plain or centrifugal. Two question, therefore:
1) Has anyone any comparative consumption figures?
2) Have any Twiflex-equipped buses survived?

Ian Thompson

25/01/13 – 18:10

There can’t have been many 27ft long lowbridge double deckers built with a top deck capacity of 31. It must have been achieved by an additional 4 seater row – I travelled on these quite frequently on the 46 to Blurton Estates but I don’t recall any particular problem with passing other seated passengers when alighting.

Ian Wild

26/01/13 – 06:38

Here’s a photo of a Twiflex Centrifugal Clutch, looking much like the shoe part of a drum brake, certainly simpler than a fluid flywheel. See //tinyurl.com

Chris Hebbron

27/01/13 – 07:55

That’s pretty much as I recall the Twiflex clutch except that the modern version seems to be hydraulically actuated (pipe to each segment). My recollection is that the shoe assemblies were on metalastic mounts which dampened the centrifugal force as the assembly was accelerated. It’s a long time ago-I may not have this quite right. interesting to see the design is now of Ukranian manufacture! I don’t recall having to replace one of these clutches whereas the fluid flywheel glands in Atlantean, Fleetline and Roadliner were commonplace failures.

Ian Wild

27/01/13 – 12:17

And to what vehicles do you recall these clutches being fitted, Ian?

Chris Hebbron

28/01/13 – 17:35

Chris-all 30 of the PMT Daimler CVG5s of 1956 were delivered with Twiflex clutches in place of fluid flywheels. I’m sure I’ve read somewhere (maybe elsewhere on this site?) that Walsall Corporation also tried them in the mid 50s.

Ian Wild

22/07/14 – 06:48

Walsall Corporation took delivery of 15 Daimler CVG6 buses with twiflex system transmission in 1956 and they were nicknamed "jumping jacks". Here’s a newspaper report from 1974 referring to these buses: www.flickr.com/photos/walsall1955/

Walsall1955

09/12/15 – 06:09

At Stoke Depot we did meal break duties on these on the 46 Blurton run. These ‘Jumping Jacks’ were hated to a man.

David Knight

Photograph by ‘unknown’ if you took this photo please go to the copyright page.

London Transport
1945
Daimler CWA6
Brush H5?R

An Austin 12/4 Low Loader taxi fronts this Regent Street evocative scene. Many of these were commandeered by the London Fire Brigade to haul portable pumps during the Blitz, a task for which they were greatly under-powered!
The bus to the left is STL 2345 of November 1937, an AEC Regent I chassis with LT-designed Park Royal bodywork, which was withdrawn from service on 13th March 1951. Note the downstairs rear window is now in two parts, a common modification when glass was in short supply during the war.
The centre bus is D 54, a Merton-based Daimler CWA6 chassis with Brush utility bodywork delivered in Spring 1945 and withdrawn on 7th September 1953, one of 100 to be sold to Belfast Corporation and re-bodied with an attractive Harkness body. It lasted until 1970.
The bus on the far right is STL 2077, delivered May 1937 and withdrawn on 22nd March 1950.
There is another STL in front of it on the right edge of the photo, in post-war livery.
Were it not for the Daimler, this could easily be a pre-war scene!

Photograph and Copy contributed by Chris Hebbron

———

20/03/11 – 15:51

A wonderful picture, taken at a time of great hope and unity when everyone was pulling together in the recovery from The War. In front of STL 2345 (rather nice run of consecutive digits) is a suitably humble new RT which seems to say "I’ll keep out of the way and let the old ‘uns have their day in this picture."
The Daimler is interestingly on a short working of service 88 to Clapham Common – the normal southern terminus of this route being the lovely rustic sounding "Mitcham – Cricketers" – I can smell the new mown pitch and the cucumber sandwiches already.

Chris Youhill

———

23/03/11 – 17:35

It was interesting that, of all the utility buses London Transport possessed, only the Daimlers penetrated into the very heart of London and you can’t get more central than Piccadilly Circus!
The Cricketers Arms was a very attractive pub which overlooked a cricket green which had its own cricket pavilion, too. It was an little oasis of green in an otherwise built-up area. Sadly, the pub closed last year.
Not too far away was another bus blind terminus Mitcham Fair Green, where an annual fair took place every year. Again, a more rural event taking place in a built-up area, but sadly, since 1996, just a memory.

Chris Hebbron

Copyright ‘unknown’ if you know please get in touch

Sheffield Corporation
1952
AEC Regal IV 9821S 
Roe B44F

Sheffield quickly tried out underfloor engined single deckers when they became available with three Leyland Olympics in 1951 and three of these Roe bodied AEC Regal IV in 1952. Notably, all were for the A fleet although I recall the Olympics in particular being regular performers on the C service 48 to Manchester despite their bus seats. The Regal IVs always seemed to be out of the limelight certainly later in life being used on workmens services to the east end of the City. Of particular note is that these three were owned initially by ACV Sales being purchased by Sheffield in 1954. This photograph shows the legal owner as the Secretary of ACV Sales at 49 Berkeley Square in London. The Sheffield coat of arms is displayed but without a fleet name. Notable is the City of Oxford like vee shape on the front panel which was retained throughout their lives except for 213 which later had an all cream front panel probably as a result of accident damage repairs. There is a substantial semaphore trafficator arm behind the entrance doors. It is hard to imagine what an impact these vehicles must have made being so different from the then standard half cab single decker and with ten more seats. The photo is taken outside the Roe factory in Leeds.

Photograph and Copy contributed by Ian Wild

A full list of Regal IV codes can be seen here.

———

16/03/11 – 10:05

AEC? Roe? Perfection? …..and yet these beasts eluded me in my Sheffield childhood. I was a regular passenger on the back-loader Leylands, though. Fascinating about the early ACV ownership – presumably as demonstrators.
I love the Regal IV, especially the RF, but these were a minority with synchromesh gearboxes. Contemporary SUT RegalIV/Windover coaches had a of majority pre-select gearboxes – but even these had a minority of synchros.
As a "heavyweight" man, I never bought into the "over-engineered" tag given to the Regal IV (and Royal Tigers). The heavy Reliance and Leopard righted this wrong but we had to go through a period when I thought vehicles were under-engineered – especially when Tiger Cubs had 0.350 engines.

David Oldfield

———

17/03/11 – 06:58

I used to go to the Sheffield Depot of Independent TD Alexander (Greyhound) on a Saturday afternoon. There was a fitter there who worked for Sheffield Transport at Greenland Road Depot (apparently Sheffield knew of this arrangement) where the three Regal IV were based at that time. He told me one day that they had sent all three out as Peak District extras on the preceding Bank Holiday Monday – and all three had to be towed back with clutch faults! I seem to recall a fair bit of trouble with the hydraulic clutch operation on the PMT Reliances, probably 214 et all had the same equipment.

Ian Wild

———

17/03/11 – 18:22

Notwithstanding their frailties, the longevity of these three buses amounting to 16/17 years service was no mean feat in Sheffield terms and compares favourably with the Leyland Olympics of the time. Perhaps their mechanical shortcomings were outweighed by the fact that they were bodied by Roe who had impressed the Department with the quality of the nine PD2’s of late 1951 for the Fulwood – Malin Bridge via Hunters Bar tram replacement.

John Darwent

———

17/03/11 – 19:22

I can empathise with John’s comments about the Roe bodywork, but would the clutch problems possibly be connected to the gearbox problems experienced by AEC and, subsequently Sheffield, with the early synchros?
I believe it was Classic Bus which carried an article about a catalogue of problems with the early AEC synchro boxes which Sheffield helped ACV to sort out. The OWE Roe/RegentIIIs, and possibly the 1953 RWBs, had crash boxes and all their synchromesh gearboxes were retrofitted.
The pre-select had been designed for the 9.6 engine in the RT; the crash was a pre-war box for the 7.7 engine. Mixing manual box and bigger engine took longer to sort out than expected. Even the giants with a reputation for quality could get it wrong; but they survived by eventually sorting things out.

David Oldfield

———

19/03/11 – 07:49

The OWE batches of Regent III delivered with Roe bodies in 1952 had 9613A chassis numbers ie constant mesh gearboxes as built. The PSV Circle notes that synchromesh gearboxes were fitted to these buses in 1953. The 1953 batch of RWA registered buses had 9613S chassis numbers ie synchromesh gearboxes as built.
The three Regal IV were withdrawn in 1968, ie 16 years service. The Olympics were withdrawn 1966/67/68 (2) ie 15,16,17 yrs of service. My recollection is that the Regals did relatively light duties (58 to Thorpe Hesley and 106 to Brookhouse Colliery – both Colliery/Works services – being typical). The Olympics were used latterly on the well loaded and hilly service 31 to Lower Walkley. probably due to CoF expiry dates Olympics 11 and 26 outlasted the rear entrance ‘crush loader’ Royal Tigers on this service. My notes at the beginning of 1968 show that at this time 26 was the oldest bus in the fleet and its last repaint was in December 1960 – ‘it looked rather shabby’. By comparison 11 (the ex Demonstrator) had been repainted in June 1966 and ‘had a full set of retrimmed seat cushions’.

Ian Wild

———

19/03/11 – 17:16

Thanks for clarification, Ian. I lived on the 31 until I was 5, when I moved to Greenhill. I do remember the Regal IVs being 58/Thorpe Hesley regulars.

David Oldfield

———

04/10/11 – 21:01

That AEC OWB 14 was a regular performer on route 40, Sheffield – Bakewell and was also used on the Bakewell school run via the Hope Valley, been on it many a time when I was at Lady Manners School 1953-56. I also recall another single decker RPA 221 which was a Surrey registration, but I can’t recall if it was a Leyland or AEC. Other AECs I remember on that route started with TWJ — reg at that time.

Chris Webb

———

05/10/11 – 06:38

Chris RPA 221 was an ex demonstrator Leyland Olympic, the registration a Surrey one, local to Weymann at Addlestone. The AECs you mention were the C fleet integral AEC/Park Royal Monocoaches

David Oldfield