... and to the Republic for Which We Stand ...

nigel richards said:
Everyone has a natural working rythm and a personal approach to details.

Don't apologise for the awesome work you're doing Sir.

In the words of the wise American author - Maurice Grenville Kains ('Five Acres and Independence);

"Make haste, STEADILY!"
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LOL Nice quote. Mine is simple, "Focus forward".
 
Wow! You have made a lot of progress with so many details; it's amazingly coming to life before our very eyes! :applause:
 
LOL! Thanks very much guys. :salute:

It is definately thick through the mid-section but they had to cram a lot-o-stuff in there to keep it cool and make it go fast, technically speaking that is!

Jet age driver you say! This thing could pass most of the 1st gen jets like they were backing up! :icon_lol:

I could be wrong, but I believe it set the record for first recip to achieve 500+ MPH (?) in level flight.

But seriously, I would imagine that will be taken care of at the proper time.

:running: :running:
 
The XP did exceed 500 mph in level flight with an off the shelf R2800 and four blade prop. The more sophisticated H did not, though it was expected to once its experimental Chrysler engine was able to achieve full power.

T
 
fliger747 said:
The XP did exceed 500 mph in level flight with an off the shelf R2800 and four blade prop. The more sophisticated H did not, though it was expected to once its experimental Chrysler engine was able to achieve full power.

T
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That is impressive, given the time period, Tom. An off the shelf XP47 with it's R2800 Pratt would give some of the most highly modified air racers of today a real run for the money.

BB686:USA-flag:
 
fliger747 said:
The XP did exceed 500 mph in level flight with an off the shelf R2800 and four blade prop. The more sophisticated H did not, though it was expected to once its experimental Chrysler engine was able to achieve full power.

T
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Tom, BTW, I have some new specs for the H when you are ready to take a look at her FM.


Thanks
 
During the war, many outstanding projects were not brought to service just because of the delay in ongoing production that their adoption would have entailed. One example was the P38K, which used a Hamilton Std hydromatic prop, instead of the electric Curtis models. Greatly improved performance, but the spinner was bigger, requiring new cowlings. Would have caused a two week delay in production.

The P47M was enough of an improvement that the large modifications of the XP were not considered worth the ensuing production delays.

Milton:

Looking fwd to any new info you have turned up for the H!

Cheers: Tom
 
fliger747 said:
During the war, many outstanding projects were not brought to service just because of the delay in ongoing production that their adoption would have entailed. One example was the P38K, which used a Hamilton Std hydromatic prop, instead of the electric Curtis models. Greatly improved performance, but the spinner was bigger, requiring new cowlings. Would have caused a two week delay in production.

The P47M was enough of an improvement that the large modifications of the XP were not considered worth the ensuing production delays.

Milton:

Looking fwd to any new info you have turned up for the H!

Cheers: Tom
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Thanks Tom. Package sent. :)
 
fliger747 said:
During the war, many outstanding projects were not brought to service just because of the delay in ongoing production that their adoption would have entailed. One example was the P38K, which used a Hamilton Std hydromatic prop, instead of the electric Curtis models. Greatly improved performance, but the spinner was bigger, requiring new cowlings. Would have caused a two week delay in production.

The P47M was enough of an improvement that the large modifications of the XP were not considered worth the ensuing production delays.

Milton:

Looking fwd to any new info you have turned up for the H!

Cheers: Tom
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I believe you're referring to the XP-72, when referring to the XP, correct? As the P-47J also reportedly achieved 500mph in flight as well. I guess Milton will have to add an XP-72 to his list, a ways down, along with an XR-12 Rainbow.;)

Great work Duckie, that looks fantastic!
 
There were two "XP's" one was the XP-47, and the other, the "Superbolt" was the XP-72. The XP-72 had a 3 blade contra-rotating prop, the XP-47J used the standard 4 blade, other than that.. their overall shape was very similar. Both were fast and agile... but due to time factors in development, and budget constraints as stated above, neither plane made it to active service.

BB686:USA-flag:
 
Regarding the XP47J Performance

The fastest version of the Thunderbolt was the XP-47J, which was proposed in November 1942 as a lighter-weight version of the Thunderbolt designed to explore the outer limits of the design's basic performance envelope. The XP-47J was fitted with a 2800 hp Pratt and Whitney R-2800-57(C) housed inside a close-fitting cowling and cooled by a fan. The ventral intake for the CH-5 turbosupercharger was separated from the engine cowling and moved aft. The four-bladed propeller was fitted with a large conical-shaped spinner. The wing structure was lightened and the armament was reduced from eight to six 0.50-inch machine guns. The contract was approved on June 18, 1943.

The XP-47J was a completely new airframe and not a conversion of an existing P-47D. The serial number was 43-46952. The XP-47J flew for the first time on November 26, 1943. On August 4, 1944, it attained a speed of 504 mph in level fight, becoming the first propeller-driven fighter to exceed 500 mph. At one time, it was proposed that the J model would be introduced onto the production line, but the advent of the even more advanced XP-72 resulted in plans for the production of the P-47J being abandoned before any more could be completed.

A proposal to adapt the XP-47J to use contrarotating propellers with an R-2800-61 engine was dropped.

Maximum speed of the XP-47J was 507 mph at 34,300 feet, range was 765 miles at 400 mph, 1070 miles at economical cruising speed. An altitude of 15,000 feet could be reached in 4.5 minutes. Service ceiling was 45,000 feet. Weights were 9663 pounds empty, 12,400 pounds normal loaded, 16,780 pounds maximum. Wingspan was 40 feet 11 inches, length was 33 feet 3 inches, height was 14 feet 2 inches, and wing area was 300 square feet.

From http://www.geocities.com/pentagon/qu...485/P-47M.html :

The "J" was fitted with a high output version of the P&W R-2800. Specifically, the R-2800-57. This engine made 2,800 hp @ 2,800 rpm at 35,000 feet. This is in War Emergency Power.

The aircraft actually attained 507 mph at an altitude of 34,300 feet. 2,800 hp is 133% of rated power. At military power (100%), the XP-47J could sustain 470 mph. 435 mph was attained at 81% of its rated power (1,700 hp). All performance figures were obtained at 34,300 feet.

The "J" model was an especially good climbing fighter too. It had a climb rate at sea level of 4,900 fpm. At 20,000 feet, it was still rocketing up at 4,400 fpm, and got there in 4 minutes, 15 seconds. Time to 30,000 feet was only 6 minutes, 45 seconds. Now that's an interceptor! Yet it had a usable range of 1,075 miles. Rather impressive, don't you think? No, this was not a stripped down hotrod. It was fully armed and carried ballast in the wings equal to 267 rds per gun. The aircraft was flown to a height of 46,500 feet and was capable of a bit more.
http://www.ww2aircraft.net/forum/aviation/what-plane-do-you-wish-had-sawservice-913.html
 
Very interesting reading. Impressive numbers when you consider that the XP-74J was a fully loaded warplane at the time it achieved those results.

"No, this was not a stripped down hotrod. It was fully armed and carried ballast in the wings equal to 267 rds per gun. The aircraft was flown to a height of 46,500 feet and was capable of a bit more".

BB686:USA-flag:
 
I never realized the J made it that high. That's impressive performance. It's also good to see at what power rating it achieved its speed. Even when it was just cruising it was fast. Also, with regard to the "full blown" aircraft reference, I believe that is stated because Republic actually flew a razorback with the necessary aerodynamic mods of the J before they actually flew the J model and some people think the pics of it are actually of the J. Like the pic of the aerodynamic test bed landing that many think is a pic of the J landing. It's in Walter Boynes book on the P-47.

That said, I'm really psyched that Milton is making these great fighters.
 
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