[dnr]

Results of my comparision demonstrate a marginal increase in performance of the 100 octane over the 87 octane Mk 1 Hurricane when using the boost cut out. There does not appear to be any increase of performance other than slight improved acceleration for the 87 octane when the boost cut out is pulled. What is demonstrated is that the 100 octane Mk1 is very prone to failure soon after employing the boost cutout. Works best at low altitude, but you have only 1 minute to engine destruction. At 20,000, the 100 octane will hold a steady at 210 mph +2.5 beyond 6 minutes whereas the 87 octane at +3 210 mph blows up after two minutes. Otherwise, you can run the 87 octane at +5.5 lbs all day at 240 mph. So my assessment is that the 87 octane is a better option for combat operations (e.g. very slight trade off in performance, versus substantial improvement in reliability)

Mk1 Hurricane Comparison between 87 and 100 Octane Rotol

100 Octane
87 Octane
Wind: 0 mph/0 % deflection
Boost Start 0 psi
Weight 3177 lbs
Fuel 100%
Start Speed 180 mph
Rad 100% Open
X engine failure

2,700 RPM SPEED & ACCELERATION
Altitude 1 min 2 min 3 min 4 min 5 min 6 min (BOOST)
5000 ft 240 mph 260 mph 260 mph X Goveror failure X +8
5000 ft 210 mph 230 mph 230 mph 240 mph 240 mph 240 mph +6.2

10000 ft 240 mph X Gasket failure X X X +8
10000 ft 220 mph 240 mph 240 mph 240 mph 240 mph 240 mph +6.1

15000 ft 220 mph 240 mph 240 mph 240 mph 240 mph 240 mph +7.2
15000 ft 230 mph 230 mph 240 mph 240 mph 240 mph 240 mph +6.1

20000 ft 190 mph 200 mph 210 mph 210 mph 210 mph 210 mph +1.5
20000 ft 200 mph 210 mph 210 mph 210 mph 210 mph 210 mph +3

3,000 RPM SPEED & ACCELERATION
Altitude 1 min 2 min 3 min 4 min 5 min 6 min (BOOST)
5000 ft 260 mph X Gasket failure X X X +8
5000 ft 220 mph 240 mph 240 mph 240 mph 240 mph 240 mph +5.5

10000 ft 240 mph X Gasket failure X X X +8
10000 ft 220 mph 240 mph 240 mph 240 mph 240 mph 240 mph +5.5

15000 ft 220 mph 240 mph 240 mph 240 mph 240 mph 240 mph +8
15000 ft 230 mph 240 mph 240 mph 240 mph 240 mph 240 mph +5.5
no BCO 220 mph 230 mph 240 mph 240 mph 240 mph 240 mph +5.5

20000 ft 190 mph 200 mph 210 mph 210 mph 210 mph 210 mph +2.5
20000 ft 200 mph 210 mph X Burnt intake X X +3

All engine failures were confirmed with a second test
All tests conducted with Boost Cut Out pulled

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