Build a Perseus-powered fighter for FAA alongside Skua, 1937

The Roc's Perseus engine gave roughly 905hp compared to the Gladiator's Mercury at 840hp. This was probably largely down Bristol's Board not allowing Feddon to take full advantage of the sleeve valves though. Had he been given free reign though is there any reason the Perseus 100 couldn't have been available?
 
Let's not make a conspiracy theory of it. Sleeve valves will not make small & light engines make big power, that is what supercharger is for, along with hi-oct fuel when available, high revs and hopefully low compression ratio. Britain was in no need for yet another 900-1000 HP engine in late 1930s, they were looking at 1500-2000.
The reason why Roc's Perseus gave more HP was because it's supercharger sucked less power, being geared for lower altitudes. Talk 905 HP at 3500 ft vs. 840 HP at 14500 ft on the Gladiator or Blenheim. The Mercury XI and XII, low alt versions, were making 890 HP at 6000 ft. All HP figures for 87 oct fuel. The Perseus weights 100 lbs more - bottom line there is no gain.
Conversely, the Perseus X, with supercharger geared for high altitudes (and the S/C was bigger?) was doing 880 HP at 15500 ft, now that version looks part, despite the higher weight? Take off power was lower, though - 750 HP.
Both Bristol's board and Fedden knew too well that bigger displacement will bring more power, hence the Taurus, Hercules and eventualy Centaurus. Whose cylinder dimensions were shared by Perseus 100.
 
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