P-47s

[ImpalerNL]

Originally Posted by ImpalerNL

It's a great airplane.

At 2.06 you can see that the supercharger doors are open a bit.
It means that the intercooler is warm so the supercharger is in use on this p-47.

[IceFire]

Originally Posted by ImpalerNL

At 2.06 you can see that the supercharger doors are open a bit.
It means that the intercooler is warm so the supercharger is in use on this p-47.

It's a turbosupercharger so... if the supercharger is in use does that mean by necessity that the turbo is also working?

[ImpalerNL]

Originally Posted by IceFire

It's a turbosupercharger so... if the supercharger is in use does that mean by necessity that the turbo is also working?

The supercharger is mechanically powered by the engine and the turbo is driven by the exhaust gasses so both are working anyway.

[ElAurens]

The exhaust smoke you see at the front of the aircraft on start up is coming from the waste gate outlet. It's the waste gate that bipasses exhaust gas to control the amount of boost that the turbo produces.

The turbo exhaust outlet is that bump under the rear of the fuselage.

One of the give-aways that the turbo is still installed and operable is exhaust smoke coming from that rear outlet. EVen with the boost pulled way back for start up, there would still be some venting from the rear turbo exhaust ports.

Remember that turbo units for aircraft from this period are absolutely gigantic compared to the automotive turbo-superchargers that most folks these days are familiar with. The only place with enough room for it on a P-47 is in the rear fuselage, it and it's ducting take up almost all the available space back there.

[ElAurens]

The technically correct name for a "turbo" is turbosupercharger. It's just an exhaust gas driven supercharger, and if equipped it does not necessarily mean that the engine has a mechanically driven supercharger as well.

If an engine does have both it is commonly called a compound supercharged engine.

At least that is how I remember it.

[Furio]

Originally Posted by ElAurens

If an engine does have both it is commonly called a compound supercharged engine.

At least that is how I remember it.

If I’m not mistaken, the turbo compound had turbines mechanically connected to the crankshaft, or a blowdown turbine. Just one type was ever produced: the Wright R3550. http://en.wikipedia.org/wiki/Wright_R-3350

[ElAurens]

Yes, that is the one I was thinking of.

[majorfailure]

Originally Posted by ElAurens

The turbo exhaust outlet is that bump under the rear of the fuselage.

One of the give-aways that the turbo is still installed and operable is exhaust smoke coming from that rear outlet. EVen with the boost pulled way back for start up, there would still be some venting from the rear turbo exhaust ports.

I think we can see this in this vid, at ~0:23:

http://www.youtube.com/watch?v=h5ch3zmZ9Zw

[ElAurens]

Yes indeed.

[SuperEtendard]

ElAurens i found a video where those P-47's Wicked Wabbit and Hun Hunter XVI fly together, and everything from Wicked Wabbit pilot's perspective, with a cam on his helmet!

Very interesting to know the cockpit and how it works from live inside