Wild_Bill_Kelso
Senior Master Sergeant
- 3,231
- Mar 18, 2022
The OK for 1940 supercharger but failed to improve supercharger over the next 3 years.
Well except for the 3,000 two speed merlin ones they made in 1942 and 43
Spitfire V used single speed supercharger and the Spitfire VI used a single speed, single stage supercharger (granted they didn't build very many of them)
The Spitfire VI had a pressure cabin, extend wings, 4 bladed prop, 364mph at 22,000ft and a service ceiling of 40,000ft. All with a single speed, single stage supercharger.
And how did the Spitfire VI perform at lower altitudes? Or the V for that matter? Superchargers, as you well know, could be tuned for different altitudes. With the Spit V they had the normal, LF with cropped impeller and (usually) cropped wings, and high altitude versions with the extended wingtips (which rolled like a Lancaster)
It was helpful to have a lighter airplane, but it didn't solve the need for an adjustable supercharger of some kind. As you well know.
But Hooker was already working on the two speed, two stage supercharger.
There was no real magic about multi-speed superchargers. But they needed to be big enough to get the job done. Using a small impeller was not going to get the job done no matter how many speeds you used.
Correct.
Nobody else was trying to use an 8300-8500lb fighter with a 1150hp engine.
That is a bit of an exaggeration, as you probably are aware. And it weighed less than a P-51A with the same exact engine.
Once it got above 12-13,000ft on the D-E-K s that is all the power you had,
and once of got above 17,000ft (in level flight) you had 1125-1150hp on the M & Ns.
This is for the stripped P-40N-1, 4 guns, no electric start, forward wing tank removed, etc.
you can put lipstick on a pig, The pig may be able to move pretty quick for a short distance. It is still a pig.
Except it wasn't 1150 hp at the lower altitudes, in fact it was over 1,500 hp
Which makes you wonder why that particular 'pig' was the 5th highest scoring US fighter, more than the F4U or F4F, more than the Spitfire in US use plus the P-39 combined.