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Seversky/Republic AP series - AP-1 to AP-100

hesham

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Hi,

the AP-24 was YOA-15 aircraft developed from RC-3,powered by one 215 hp Lycoming O-425-5 engine,and not with XO-425-7.
 

Nico

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Googling-around for a research about Army Air Forces Very Long Range Escort Fighters I found these interesting documents:

http://www.wwiiaircraftperformance.org/p-47/p-47.html

confirming that
AP-16a was the P-47M
and AP-16b was the P-47N-5.
About that matter, I remain in doubt regarding the designations of previous main versions of Thunderbolt, as P-47B, P-47C and P-47D...

Nico
 

Stargazer2006

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Thanks Nico! Had the AP-16a but AP-16b is new to me.
The first THUNDERBOLT was the AP-10, so it is likely that the early razorback versions must have been AP-10a/b/c... while AP-16 was allocated to the bubble canopy versions. Just my two cents.
 

Stargazer2006

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Also an addition to the list:

AP-71 THUNDERCHIEF - RF-105B reconnaissance version.

Don't ask me where I found it, just realized I added it to my list a while ago, but surely it must have been from the web.
 

nugo

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I have long been seeking a designation of XF-12, but could not find. But I think that designation AP-41--original XF-12 designation not true. I think that this designation should be a modification. I think name of the XF-12 should be in the range of AP-25...27 or just another designation.
Will be interesting to your thoughts on this version and what can you say about my reasons ?
 

Stargazer2006

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Drawing for AP-41 proposal is dated 15 Oct. 1947, if that's of any help.

I do agree that with the YOA-15 Seabee (an RC-3 derivative) being the AP-24, it would make sense that the RC-1 and RC-2 should carry earlier numbers.

AP-17 seems too early, AP-20 more likely, but I have no information to prove this at present time.
 

nugo

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Hi All!
My friend Stargazer2006, first draft of the YOA-15, submitted by the military at the end of 1944 or at the beginning of 1945, was soon the development of RC-1 than the RC-3. First flight of the RC-1---30 November 1944 and first flight of the RC-3---1 December 1945.
You can see more information about this in wikipedia: Republic RC-3 Seabee.
If XP-72(Model AP-19) development began in late 1941 and early 1942, the development of AP-20 began no earlier than 1942, and the launch of the XF-12 began in late 1943 to early 1944 (By the way at the same time work began the RC-1 Thunderbolt Amphibian).
I think that XF-12 should be or AP-20 or AP-25...or we have not known the designation.
But if these two planes began to develop around the same time that the factory should be marked with one after the other.
 

Stargazer2006

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nugo said:
first draft of the YOA-15, submitted by the military at the end of 1944 or at the beginning of 1945, was soon the development of RC-1 than the RC-3. First flight of the RC-1---30 November 1944 and first flight of the RC-3---1 December 1945.
Thanks for the correction, nugo.

nugo said:
If XP-72 (Model AP-19) development began in late 1941 and early 1942, the development of AP-20 began no earlier than 1942, and the launch of the XF-12 began in late 1943 to early 1944 (By the way at the same time work began the RC-1 Thunderbolt Amphibian).
I think that XF-12 should be or AP-20 or AP-25...or we have not known the designation.
But if these two planes began to develop around the same time that the factory should be marked with one after the other.
This makes a lot of sense. If we consider that RC-1 was designed before RC-2, then logically RC-1 could be #20 and RC-2 could be #25 or maybe #26.
But as I was writing these lines it dawned on me that they just couldn't be AP-... because the "A" signified "Army". So that's one possible reason why our search for "AP-20" and "AP-25" has been unsuccessful so far...
 

Stargazer2006

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Ultimate online reference on the Seabee is http://www.seabee.info
According to the author, "The prototype [RC-1] had secretly been under development since January 1944," so it makes me wonder if AP-24 was not simply the sole designator for both the RC-1 and YOA-15...

And of course, let's not forget the possibility that the RC- list was created OUTSIDE the AP- list precisely to reflect the commercial status of the projects. In that case, there would be NO AP- type designator for them...
 

nugo

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Hi All!
more...
XF-12---Model AP-2? or ?, beginning of the development in late 1943 or early 1944.
JB-2-----Model AP-22 or AP-2?, beginning of the development/construction in the second half of 1944.
MX-773---Model AP-3? (or AP-2?), beginning of the development in late 1945 or early 1946.
AP-41---development of the XF-12 (4xR-4360 VDT (maybe)), beginning of the development in 1947.
Information from the past:
New additions for the Republic Projects list.
Model AP-22 - Drone (apparently a version of the V-1 flying bomb).
AP-24 - Amphibious aircraft with XO-425-7 Franklin air-cooled engines, 1945.
AP-38 - Cargo and Personnel Land-based Transport.
AP-41 - The original proposal for the XF-12 Rainbow, drawing dated 15.10.47.
My friend overscan, if you can say about the sources of the AP-22 and AP-38?
 

overscan

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Nugo, the source is research by the author Tony Buttler as stated.
 

memaerobilia

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Another archive mystery? This time from Republic Aviation.
Just came across a long lost July 1944 Republic Aviation file book of Organization Charts, and there was a loose note page tucked in. So the info MAY of MAY NOT be from Republic, and could have been placed in there, much later.
It SHOULD have been easy to track down the design because it had FIVE engines (two tractor props at the front of each outer pod, and two smaller Pusher prop engines at the trailing edge of each wing-outside of each of the two pods. Then it had a four blade pusher prop engine at the rear of the short center pod. The general layout being similar to a P-38 shape with the twin-boom and twin tail. and center pod. Also very remarkable for being a giant sized airliner or troop transport, having (at least) 15 passenger windows on the inside and outside of each of the pods. The short center pod having fewer windows for two decks high. Do these unique features sound familiar to anyone? I have tried various Internet searches but came up empty. It was developed at LEAST to the model stage,
FIVE engines with 3 pusher, two tractor propellers
Very large size resembling giant P-38 general config./shape
airliner or troop transport
"possibly" from Republic.
 

nugo

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Hi All!
My friend memaerobilia, if you can show picture, then we say our opinion (maybe this project is the Seversky/Republic "Super Clipper" or its development).
 

overscan

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From Tony Buttler

Republic Project List

The following are known project numbers.

AP-1 Modified P-35 for trials 1937
AP-2 Lost out in 1937 pursuit competition. Featured flush retracting gear.
AP-3 Proposal with liquid cooled Allison V-1710 engine – abandoned in favour of AP-4.
AP-4 Adaptation of P-35. Order of 13 aircraft in March 1939 (YP-43) delivered in September 1940 as P-43 Lancer.
AP-4J 1400hp Pratt & Whitney R-2180-1 powered proposal. 80 ordered Sept 13, 1939 as P-44 Rocket. Order cancelled.
AP-4L Proposal with 2000hp R-2800-7-also not constructed. Some sources use the name "Warrior" instead of "Rocket".
AP-5 Single seat fighter.
AP-6 Single seat fighter.
AP-7 Speed record aircraft. In 1938 Major Seversky used this aircraft to establish a new transcontinental speed record.
AP-8 Never completed. Formed the basis for the AP-9
AP-9 Entrant in 1939 Air Corps fighter competition based on AP-8. Used improved airfoil. Air Corps turned proposal down in favour of Bell XP-39.
AP-10 Response to Air Corps circular proposal 39-770. Design submitted in August 1939 for a light weight fighter to be powered by a Allison V-1710 liquid cooled engine. Army placed an order as XP-47. XP-47A stripped version of XP-47. Contract signed January 1940. September 1940 all work on XP-47 and XP-47A was terminated. Full scale wind tunnel model handed over to Langley Field for testing. In same month contract placed for XP-47B - later to become the Thunderbolt.

AP-12 Republic answer to R40C. Highly streamlined design with engine behind the cockpit driving tractor contraprop in the nose via long shaft. Illustrations showing the design as the "Republic Rocket".

AP-16B F-47N version of Thunderbolt.

AP-18 Development of AP-12 "Rocket". Intended powerplant Wright R-2160. Design ordered as XP-69 in July 1941. Scale mock-up June 1942. Final configuration had long bubble cockpit. Cancelled 1943.
AP-19 = XP-72.

AP-21a Appears to be North American XT-28.
AP-22 Unmanned flying bomb drone project based on German V-1. Loon?
AP-23 Straight wing fighter project, 19.9.44. Became XF-84 Thunderjet fighter bomber prototype first flown 28.2.46.
AP-23X Preliminary design - March 1947 - for a sweptwing F-84. Not accepted by Air Force Material Command.
AP-23M Final sweptwing proposal . On the 10th November 1949 ordered as the YF-96.
AP-24 Amphibious aircraft with XO-425-7 Franklin air-cooled engines, 1945.

AP-31 Proposal for high performance research aircraft and day interceptor, 1.46. Competition won by Convair XP-92 but AP-31 design ordered as prototype XF-91 Thunderceptor. XF-91 first flew 9.5.49 but no production.

AP-41 XF-12 Rainbow initial proposal dated 15.10.47.
AP-42 Heavy USAF bomber, c1944/45. Follow up/replacement design for B-47.

AP-44A Mach 3 all-weather high altitude interceptor, early 1948.

AP-46 Development of F-84F fitted with turboprop engine as XF-84H and first flown 22.7.55. Apart from wing and cockpit, pretty well all new aircraft. No production.
AP-47 Mixed-power ground support airplane proposal, 9.48. Radial piston engine, jet in rear fuselage, general configuration fairly similar to Ryan Fireball.
NP-48 Proposal for US Navy interceptor based on XP/XF-91, c9.48. Probably to OS-113.
NP-49 Proposals for US Navy interceptor with V-tail & underwing engine nacelles, c9.48. Probably to OS-113.
NP-50 Naval bomber, late 1940s. Competitor in OS-111 competition won by Douglas A3D.

NP-52 Twin-engine anti-submarine aircraft, early 1950s.

AP-54 Single engine swept wing all-weather interceptor fighter study with F-91-style wing and large tip fittings, late 1949/1950. One of submissions to ‘1954 Interceptor’ requirement MX1554.
AP-55 Twin-boom inverted V-tail lightweight fighter/interceptor project, early 1950. Later believed in competition with Lockheed F-104. Several versions drawn, one also as submission to ‘1954 Interceptor’ requirement MX1554, none built.

AP-57 ‘1954 Interceptor’ proposal and full development into Mach 3 XF-103, 1951. Three prototypes ordered but project cancelled 8.57 before had flown.

AP-?? All Weather Fighter-Bomber Study to MX1764, c1950/51.

AP.60 Four engine turboprop bomber aircraft based on XF-12 Rainbow. 1949.

AP-63 Swept wing fighter bomber, 1951 onwards. Numerous layouts covered by designation. Eventually design AP-63-31 built as F-105A Thunderchief to WS.306A. First example flew 22.10.55.

AP-71 RF-105B/RF-105C version of Thunderchief.

AP-75 Long range interceptor to WS.202A, c5.54.
AP-76 Study to requirement won by NAA X-15. Also in competition with Douglas project.

AP-85 Two-seat swept-wing development of F-84F Thunderstreak, c1955.

AP-95 ASM ballistic missile to fit inside F-105 weapons bay.
AP-96 Man in space vehicle.

AP-99 Strategic ASM ballistic missile.
AP-100 V/STOL fighter-bomber proposal with three large lift fans mounted in centre of wide fuselage, 1959/60.

AP-106 Parametric studies for VTOL aircraft.

TFX Believed Republic undertook Tactical Fighter studies to TFX requirement, 12.61. Competition won by General Dynamics/Grumman F-111.

FX Proposals for new fighter, 1965 onwards. One possibly designated FH-100. Studies included v-g wings but final fixed-wing proposal of 1968 rejected for McDonnell Douglas design that became F-15.

FR-150 V/STOL fighter design proposed for Sea Control Ship, 30.12.71. Lost to Rockwell XFV-12A.

AP-183 Helicopter.
 

hesham

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Hi,


here is an info about AP-90,it was a VTOL utility transport aircraft aircraft competing with the
Lockheed Jet Star and North American Sabreliner.


AP-90 source is; Air Pictorial Feb 1958.
 

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Stargazer2006

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Most likely a typo. Not only the designation SEV-4 is not known to have been used, but the number in these early designations indicated the number of seats (SEV-3 for three, SEV-6 for six, etc.) so it is very unlikely that the SEV-1XP could have been a "SEV-4"...
 

hesham

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Thank you my dear Skyblazer.
 

burunduk

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Dear Colleagues!

According to the "Army air forces statistical digest, World War II", published 12.1945, tab. 75, p.117
USAAC purhased from Republic during 1940-1945
272 P-43
9006 P-47
AND 160 "others": 151 in 1940 and 9 in 1941.

60 "others" may be easily found: they are P-35A, or EP1-106, the second part of Swedish order, requisitioned by USAAC 24.10.1940.

But what are 100 more? I have no idea. Couldn't you help me?
 

hesham

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From Le Fana 387,

FRC-225 was T-46.
 

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AP-24 Thunderbolt amphibian, later Seabee as noted by Skyblazer in an earlier post.
 

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