ou simplement si vous aimez les belles mécaniques
un pote des States vient de m'envoyer ceci.....
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I wonder how many gallons of oil they lost in the two minutes. The sound of the starter motor made my hair stand up. How many batteries? No wonder the ex-F4U guys walked funny, torque on take-off from a carrier must have required a wood leg, even with a smaller (somewhat?) engine.
Pratt & Whitney R-4360-20 first start
Below, you will finda great test stand video of the Pratt & Whitney 4360 Wasp engine introduced in 1944. Basically, the engine was28-cylinderfour-row air cooled radial engine. Each row of pistons was slightly offset from the previous, forming a semi-helical arrangement to facilitate efficient airflow cooling of the successive rows of cylinders, with the spiraled cylinder setup inspiring the engine's "corncob" nickname. A mechanicalsuperchargergeared at 6.374:1 ratio to engine speed provided forced induction, while thepropellerwas geared at 0.375:1 so that the tips did not reach inefficientsupersonicspeeds. Initially, it developed 3,000 horsepower, later models gave 3,500 horsepower.
The 4360 powered the B-50, successor to the B-29 and later the B-36, to name a few. And although reliable in flight, the Wasp Major was maintenance-intensive. Improper starting technique could foul all 56spark plugs, which would require hours to clean or replace. As with most piston aircraft engines of the era, thetime between overhaulsof the Wasp Major was about 600 hours when used in commercial service.
Why am I sending this to you?Because it looks and sounds neat.That's all. Just a test stand video of a newly restored engine. But turn the speakers all the way up. Bask in the roar of twenty-eight cylinders belching the sound of freedom. Also, the sound will most likely clear out the cat, your wife and any other extemporaneous people not accustomed to military sounds and the glorious roar of a Pratt & Whitney "round" engine.As the Warbird people say, "Jets are for kids."
visionnez donc cela sur le lien ci-dessous
bon allez, pour le plaisir des yeux; juste une 'tite tof'