Armstrong Siddeley cars with highest power to weight ratio

Most accurate predictor of acceleration is power to weight ratio. The more power engine can produce and the less mass it has to accelerate, the quicker the acceleration.

For low speed acceleration and acceleration from standstill, traction also plays important role. Aerodynamic drag takes over as dominating factor at high speed.

Everything in between is where power to weight ratio matters the most. Mid-range acceleration is also important for track performance.

#	make & model	Hp/tonne▼
1.	1961 Armstrong Siddeley Star Sapphire Mk II	132
2.	1958 Armstrong Siddeley Star Sapphire MK I	106
3.	1953 Armstrong Siddeley Sapphire 346	91
4.	1955 Armstrong Siddeley Sapphire 234	89
5.	1955 Armstrong Siddeley Sapphire 236	62
6.	1950 Armstrong Siddeley Tempest	53
7.	1946 Armstrong Siddeley Hurricane 18	53
8.	1945 Armstrong Siddeley Lancaster 18	51
9.	1946 Armstrong Siddeley Hurricane 16	49
10.	1946 Armstrong Siddeley Typhoon	46
11.	1945 Armstrong Siddeley Lancaster 16	45
12.	1936 Armstrong Siddeley 12 Plus	34
13.	1919 Armstrong Siddeley 30	15
14.	1936 Armstrong Siddeley 20/25	13
15.	1925 Armstrong Siddeley 18/50	12
16.	1949 Armstrong Siddeley Whitley 18	12
17.	1921 Armstrong Siddeley 18	12
18.	1928 Armstrong Siddeley 15/6	11
19.	1938 Armstrong Siddeley 16	10
20.	1935 Armstrong Siddeley Short 17	10
21.	1926 Armstrong Siddeley 20	10
22.	1927 Armstrong Siddeley 15	10
23.	1923 Armstrong Siddeley 4-14	10
24.	1935 Armstrong Siddeley Long 17	10
25.	1929 Armstrong Siddeley 12	9