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Analysis of power-to-weight, Double deck types up to 27ft long, 1947-58 Note. In some cases dimensions have been rounded slightly. Some 30ft-long types included for interest but excluded from comparative placings.
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Operator
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Chassis
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Body
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Year new
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UW t.cwt.q |
Length x width |
Lts / bhp |
Bhp per cwt of UW |
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Double deckers
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up to 27ft long
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AEC Regt III (RT)
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Pk Royal etc
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I947ff
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7.10.0
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26'x7'6"
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9.6 ltrs/ Il5bhp*a
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0.77
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Daimler CVG5
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Brush H58R
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1947/48
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8.1.3
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26x8'
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7.0 ltrs/85bhp*b
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0.53
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Crossley DD42/6
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Crossley H54R
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1950
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8.6.2
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26'x7'6'
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8.6 ltrs/ l00bhp
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0.60
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Daimler CLG5
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Met-Cam H58R
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1952
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6.2.0*c
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27'x7'6"
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7.0 ltrs/94bhp
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0.77
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AEC Regal rebuild
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Saro H56R*d
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1953
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5.19.0
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27'x7.6"
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7.58 ltrs/90bhp
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0.76
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AEC Regent V
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Pk Royal H6IR
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1954
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6.7.3
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27x8'
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7.68 ltrs/ Il2bhp
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0.88
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Met-Cam H63R
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1954
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6.13.0
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27'x8'
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9.8 ltrs/ I25bhp
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0.94
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Daimler CVG5
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N Counties H65R
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1954
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6.17.0
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27'x8'
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7.0 ltrs/94bhp
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0.69
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AEC Rtmstr(RM)*e
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Park Royal H64R
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1958
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7.5.0
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27x8"
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9.6 ltrs/ 115bhp
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0.79
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Double deckers
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up to 30’ long
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Met-Cam H73R
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1958
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7.15.0
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30x8'
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9.8 ltrs/ I25bhp
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0.81
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Leyland PDRI*f
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Met-Cam H78R
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1962
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8.14.2
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30'x8'
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9.8 ltrs/ I25bhp
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0.72
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*a Engine derated
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*b Engine later modified to 94bhp
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*c One source states PMT Daimler UW 6.3.0 when in service.
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*d New body on rebuilt prewar chassis. Engine bhp not confirmed. |
If Later output of 98bhp,
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*e Integral construction. Production versions. Engine derated.
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*f May be compared with 1956 Leyland PDRI /Met-Cam H78F demonstrator 28ATC which had UW of only 7. 1 6. 1, giving 0.80 bhp/cwt and 0.50 seats/cwt |
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Analysis of power-to-weight, Single deck types up to 30ft long, 1950-56
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Operator
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Chassis
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Body
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Year new
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(UW (t.cwt.q)
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Length x width
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Engine ltrs/bhp
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Bhp percwt of UW
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W Alexander
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Alexander B35F*b
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1950
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6.10.2
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27'6"x7'6"
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7.4 ltrs/ l00bhp
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0.77
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Crossley SD42/7*o
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Roe B32F
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1950
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6.11.2
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27'6"x7'6"
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8.6 ltrs/ l00bhp
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0.76
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Demonstrator
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Leyland PSU I/ I3*d
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Brush B43F
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1950
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7.11.0
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30'x8'
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9.8 ltrs/ I25bhp
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0.83
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AEC Regal IV982I
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Net-Cam B39F*b
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1951
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7.15.0
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30'x7'6"
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9.6 ltrs/ I25bhp*c
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0.81
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Northern General
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AEC MC3RV*e
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Park Royal B44F
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1954
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5.8.0
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30'x8'
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6.75 ltrs/90bhp
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0.83
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Demonstrator
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Weymann B44F
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1954
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5.4.0
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30'x8'
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5.76 ltrs/90bhp
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0.87
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Dennis Lancet UF
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Davies B44F
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1954
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6.9.2
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30'x8'
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7.5 ltrs/ l00bhp
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0.77
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North Western
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Weymann B42F
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1957
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4.19.3
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30'x8'
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5.76 ltrs/94bhp
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0.94
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United Auto
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ECW B45F
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1957/58
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6.9.3
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30'x8'
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7.0 ltrs/94bhp
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0.72
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*a Forward-engined chassis. Others underfloor-engined
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*b Body classed as coach by operator
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*c One source states 120 bhp
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*d Royal Tiger
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*e Monocoach integral model
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*f Integral model
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*g Aberdonian. Engine as fitted to Leyland Tiger Cub and Olympian with increased power rating
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Comparison of some nominal chassis weights, 1952-54 period.
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Single deck, for 30'x8'
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Double deck, for 27'x8’
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AEC 1952 Regal IV 9822E
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4.15.2
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1952 Regent III 96 13E
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4.14.2
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1954 Reliance MU3RV
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3.13.0*0
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1954 Regent VMD3RV
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4. 5. 2*b
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Daimler 1952 Freeline CD650H
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5.8.0
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1952 CVG6
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4.13.2
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l954Freeline 6HLW
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5.8.0
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1954 CVG5
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4.10. 0*c
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1952 Guy Arab UF 6LW
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4.13.2
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1952 Arab III 6LW
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4.10.3
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1954 Arab LUF 5LW
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3.16.3
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1954 Arab IV 6LWIightwt
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4. 7.l*d
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4.13.0
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1 952 Titan PD2/ 12
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4.12.0
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1952 Tiger Cub PSUC I/I
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3.12.0
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1954 Titan PD2/20
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4.7. l*e
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*o AV410 or 470 engine
*b MD2RA with semi-automatic transmission: 2cwt heavier
*c CVG6:3cwt heavier
*d With 5LW engine: I cwt 3qtr lighter
*e
Lightened version with smaller tyres and fuel tank,
modified springs,
The above information extracted from an article by David Wayman.