Tommy Cookers wrote: ↑Sat Mar 13, 2021 10:22 amhttp://www.wwiiaircraftperformance.org/ ... ornet.html
proves that ....
look at Supplemental (list of items) ....
(item Merlin 130...Operating Warning Card)
the Hornet was on 100/130 initially limited to 18 lb boost - but this was raised to 20 lb
(item Hornet Pilot's Notes - Operating Data)
the Sea Hornet was (being always on 100/130) limited to 20 lb ..... and .....
(item Sea Hornet MkXX&XXI Leading Particulars)
so gave 1960 hp at 4000' ..... and of course other powers at other altitudes
ie 2030 hp widely stated eg by (former head of experimental flying) ace pilot Brown isn't inconsistent with the above
(btw the performance chart suggests that Max Combat power gave 50 mph more speed than Rated power)
an engine rating is a boost rating - not a power rating ....
for a given boost..... supercharger power consumption will vary with altitude and with (auto) throttling
so crankshaft power (within a given rating) will be different for every different altitude
(so many apparently different rated 'powers' - this usually concealed on charts as being a pointless complication)
It appears T-C, that you may be confusing an engine's 'type-tested' official horsepower 'rating'..
(It is indeed a horsepower figure, just as specifically defined in Wilkinson's book - albeit yes,
with output dependent on 'settings' levels as may be deemed 'permissible', in various operating
circumstances, & of course including fuel/boost/ADI/rpm/altitude/time-limit - particulars)
..with inflight instrumented engine 'operating data', as are listed under 'principal engine limitations'
in 'Pilot's Notes'...
It is worth checking the 'Service approval' letter in those Hornet 'supplemental' pages you linked,
as it specifically refers to 'Service Type tests' as an official source of 'ratings', from which 'limitations'
on permissible usage by pilots (& visible for them to monitor, in cockpit), are then delineated.
That the pilot of a Sabre-Tempest F6 could enjoy that 2165hp 'normal setting' (available for as long
as the fuel aboard allows) at a similar height to a Merlin making under 2,000hp (for 5mins max),
on 100/130 avgas, shows to advantage what Tempest units had in hand for pursuit of fast targets
such as V1 cruise missiles, 'rat catching' of Nazi jets, & even for realistic A2A training of RAF jets..