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Robert Johnson...Thunderbolt



 
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rothman
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Joined: 23 Jan 2014
Posts: 204

PostPosted: Sun Oct 27, 2019 1:29 am    Post subject: Robert Johnson...Thunderbolt Reply with quote

Not to be confused with the great blues singer. .but a harrowing survival tale..

https://ytcropper.com/cropped/fA5da25cdebdc52


Last edited by rothman on Mon Mar 23, 2020 8:11 pm; edited 1 time in total
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greyMike
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Joined: 20 Oct 2019
Posts: 9

PostPosted: Tue Oct 29, 2019 4:09 pm    Post subject: Reply with quote

That must be a impressive plane that time.
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rothman
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PostPosted: Wed Oct 30, 2019 12:26 pm    Post subject: Reply with quote

Startup cycle..


Link


Smaller, more common junior engine:

https://youtube.com/watch?v=A5WLCNYc6Is
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greyMike
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Joined: 20 Oct 2019
Posts: 9

PostPosted: Wed Oct 30, 2019 6:06 pm    Post subject: Reply with quote

rothman wrote:
Startup cycle..


Link


Smaller, more common junior engine:

https://youtube.com/watch?v=A5WLCNYc6Is


That is one incredible engine! Must be built for more efficiency.
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rothman
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PostPosted: Mon Nov 04, 2019 11:27 pm    Post subject: Reply with quote

greyMike wrote:

That is one incredible engine! Must be built for more efficiency.


From what I've read, it's regarded as lackluster, less than efficient....until it got up high, with a unique supercharger setup.

" Under 5000 ft, you're a meat shield.
Under 10,000 ft, you're at the mercy of any German plane.
At 15,000 ft, the turbo-supercharger kicks in.
At 20,000 ft, you are competitive.
At 27,000, the engine performs best. You have offensive power vs. anything German at this height.
At 30,000, where bombers flew, you fly faster and out-turn German planes.
Your ceiling is 43,000 ft!!!! Nothing the Germans had, even the Fw-190D was a match flying this high.

- Climb first. The P-47's most abusive ability was high-alt performance. Etch 15k ft and 20k ft into your mind, because that's when the engine starts showing.
- The plane is heavy and gigantic. Use flaps to help turnfight - but this is a last resort.
- Instead, the -47 is excellent at rolling. Fake your turn direction through roll.
- You can take damage if necessary. The engine is a piston aspirated monster. Losing pistons is survivable.'
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Don Herman rev2
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Joined: 03 May 2005
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Location: Monument, CO

PostPosted: Tue Nov 05, 2019 12:19 pm    Post subject: Reply with quote

I read long ago that a late-model change in propeller design made it much better closer to the deck...
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"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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rothman
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PostPosted: Tue Nov 05, 2019 11:40 pm    Post subject: Reply with quote

Don Herman rev2 wrote:
I read long ago that a late-model change in propeller design made it much better closer to the deck...


In England, when British pilots saw the bulk of the 47 the first time, they communicated and warned it would end up a 'sitting duck'. Which might have happened, but when pilots learned better how to fly the plane, the Germans suffered heavy casualties, avoiding encounters with it. Johnson went from white knuckle green pilot, to diving onto a group of Fw-190 alone.


Last edited by rothman on Mon Mar 23, 2020 7:58 pm; edited 1 time in total
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rothman
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PostPosted: Wed Nov 06, 2019 12:36 am    Post subject: Reply with quote

image difficulty.

(edit)

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rothman
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PostPosted: Mon Mar 23, 2020 8:24 pm    Post subject: Reply with quote

Late to the party...

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