# Energy efficiency of Vickers Vimy plane

Updated Nov 5, 2020

The Vickers Vimy:

• flew around 0.025—0.050 m/kJ
• and moved mass at around 0.081 – 0.25 kg.m/J

Contents

## Details

The Vickers Vimy was a 1917 British WWI bomber.1 It was used in the first non-stop transatlantic flight.

### Mass

According to Wikipedia2:

• Empty weight: 7,104 lb (3,222 kg)
• Max takeoff weight: 10,884 lb (4,937 kg)

We use the range 3,222—4,937 kg, since we do not know at what weight in that range the relevant speeds were measured.

### Energy use per second

We also have:

• Power: 360 horsepower = 270 kW3
• Efficiency of use of energy from fuel: we did not find data on this, so use an estimate of 15%-30%, based on what we know about the energy efficiency of the Wright Flyer.

From these we can calculate:

Energy use per second
= power of engine x 1/efficiency in converting energy to engine power
= 270kJ/s / .15—270kJ/s / .30
= 900—1800 kJ/s

### Distance per second

Wikipedia gives us:

• Maximum speed: 100 mph (160 km/h, 87 kn)4

Note that the figures for power do not obviously correspond to the highest measured speed. This is a rough estimate.

### Distance per Joule

We now have (from above):

• speed = 100 miles/h = 44.7m/s
• energy use = 900—1800 kJ/s

Thus, on average each second the plane flies 44.7 m and uses 900—1800 kJ, for 0.025—0.050 m/kJ.

### Mass.distance per Joule

We have:

• Distance per kilojoule: 0.025—0.050 m/kJ
• Mass: 3,222—4,937 kg

This gives us a range of 0.081 – 0.25 kg.m/J

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