P-51 Mustang: A History, starting with the RAF

The P-51 Mustang: A History: Built to RAF specification

Every aircraft nut is familiar with the P51, mostly with the D model, which was the definitive production model. It played a great part in the final years of the war, providing fighter escort for long-range bombers.

Few people actually realise that the first aircraft were built to RAF specification:
From Wiki:

The North American Aviation P-51 Mustang was an American long-range, single-seat fighter and fighter-bomber used during World War II, the Korean War and other conflicts. The Mustang was conceived, designed and built by North American Aviation (NAA) in response to a specification issued directly to NAA by the British Purchasing Commission.

The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed and, with an engine installed, first flew on 26 October 1940.

RAF (309) Polish squadron Mustang Is with Spitfire Bubble canopy

The Mustang was originally designed to use the Allison V-1710 engine, which had limited high-altitude performance. It was first flown operationally by the Royal Air Force (RAF) as a tactical-reconnaissance aircraft and fighter-bomber (Mustang Mk I).

Western USA Model: P-51A-10NA

The addition of the Rolls-Royce Merlin to the P-51B/C model transformed the Mustang's performance at altitudes above 15,000 ft, giving it a much better performance that matched or bettered almost all of the Luftwaffe's fighters at altitude.

P-51A

The Merlin-engined P51B

P51C "Tuskagee Airmen"

Heart of the P51C and D: The Rolls-Royce Merlin

 The definitive version, the P-51D, was powered by the Packard V-1650-7, a license-built version of the Rolls-Royce Merlin 60 series two-stage two-speed supercharged engine, and armed with six .50 caliber (12.7 mm) M2 Browning machine guns.

RAF Mustang MkIII - note the Spitfire-type curved cockpit canopy

This one is from 19 Squadron

American style plain cockpit canopy and the" quarterlight" window, which was sometimes painted out

From late 1943, P-51Bs (supplemented by P-51Ds from mid-1944) were used by the USAAF's Eighth Air Force to escort bombers in raids over Germany, while the RAF's 2 TAF and the USAAF's Ninth Air Force used the Merlin-powered Mustangs as fighter-bombers, roles in which the Mustang helped ensure Allied air superiority in 1944.

 The P-51 was also in service with Allied air forces in the North African, Mediterranean and Italian theaters, and saw limited service against the Japanese in the Pacific War. During World War II, Mustang pilots claimed 4,950 enemy aircraft shot down.

At the start of the Korean War, the Mustang was the main fighter of the United Nations until jet fighters such as the F-86 took over this role; the Mustang then became a specialized fighter-bomber. Despite the advent of jet fighters, the Mustang remained in service with some air forces until the early 1980s. After World War II and the Korean War, many Mustangs were converted for civilian use, especially air racing, and increasingly, preserved and flown as historic war-bird aircraft at airshows.

Link to post-war SAAF Flying Cheetahs in Korea blog entry

NZ Navy buys reject Aussie Seasprite Helicopters

NZ Navy buys SH2-G (I)  Seasprites rejected by Australia



Fairfax News:


The navy is to get eight new Seasprite helicopters that were originally built for the Australians but rejected by them.

Defence Minister Jonathan Coleman said the Government had approved the purchase of the upgraded and expanded Seasprite helicopter fleet.

They will be bought from the United States company Kaman Aerospace for $242 million, which includes two spare airframes, a training simulator, missiles, and additional components.

"The Defence Force currently has five Seasprites which have been in service since the late 1990s and are due for replacement," Coleman said.

The new helicopters are an upgraded variant, the Seasprite SH-2G(I).

The larger fleet will allow helicopters to be placed on board the frigates Te Mana and Te Kaha as well as on the offshore patrol vessels and the multi-role HMNZS Canterbury, he said.

"These helicopters come with modernised sensor, weapons and flight-control systems and will be a major boost to our maritime surveillance and search capability," Coleman said.

"The helicopters will also ensure that our naval fleet is able to operate at its full potential."


                               

The choppers have had a chequered past but the purchase is seen as a bargain on this side of the Tasman.

They were originally built for the Australian Defence Force, but in 2009 the Australian government cancelled the contract and decided not to introduce them into service after questions about their suitability for Australia's requirements.

"The New Zealand Defence Force and Ministry of Defence officials are acutely aware that the Australian government decided not to fully introduce these aircraft into service after concerns about a range of technical issues," Coleman said.

"As a consequence, the Ministry of Defence has invested considerable resources into examining all aspects of this project over the last two years.

"This included commissioning an independent study by Marinvent Corporation of Canada.

"Ministry of Defence officials have advised the government this aircraft will prove a very capable purchase, meet all of the New Zealand Defence Force's requirements, and can be introduced into service."

Based on that advice and after looking at other replacement options the Government approved the project.

"The replacement Seasprites will have a multiplier effect on the capability of the navy and what's more, the price is very good with alternative helicopter replacements costing three times the amount," Coleman said.

This was first reported in the media (Naval Technology in June 2012):


Kaman is set to begin negotiations with the New Zealand Government for the possible sale of 11 SH-2G(I) Super Seasprite helicopters to the Royal New Zealand Navy (RNZN) following authorisation from the US Department of State.

The recent approval will allow New Zealand defence officials to seek better options for their future maritime helicopter requirements, although no investment decisions have been made yet by either party.
The possible sale includes a full motion flight simulator, training aids, spares inventory, publications and the introduction into service and through life support of the aircraft for the New Zealand Government.

The latest version of the multi-mission maritime helicopter of the SH-2G Super Seasprite, Kaman SH-2G(I) will boost New Zealand's vertical lift capabilities and replace its existing ageing SH-2G Seasprite helicopter fleet. In addition to providing exceptional performance and low operating costs, the SH-2G(I) aircraft will support the New Zealand Ministry's objective to enhance naval helicopter capabilities through to 2025.

Capable of operating from offshore patrol vessels, the new capability will also play a vital national role in extended reach, surveillance, and air-delivered weapons capabilities for the ANZAC frigates.

The SH-2G features fully-integrated, multi-mission maritime weapon system and has been designed to support anti-submarine warfare (ASW), anti-surface warfare (ASuW), over the horizon targeting, surveillance, troop transport, vertical replenishment, search and rescue, as well as utility missions.

In May 2012, the RNZN conducted Kaman SH-2G Seasprite helicopter flight trials from its new Protector-class offshore patrol vessel (OPV), HMNZS Otago (P148) in the Hauraki Gulf and the Bay of Plenty areas.
The RNZN currently operates five SH-2G Super Seasprite helicopters.

In 1997, Australia signed an $A 667 million contract with Kaman to purchase 11 upgraded SH-2G (A) “Super Seasprites,” with modernized avionics. This compact helicopter design was thought to be well suited to operation from the RAN’s ANZAC Class frigates, and even from patrol boats with helicopter decks. The first helicopter was unveiled in 2003, but by 2005 up to 40 deficiencies had been identified including inability to operate in bad weather and low-light conditions, and inability to meet Australian airworthiness certification standards. Placing modern avionics into a 1960s air-frame proved challenging indeed; the helicopters were restricted to “passenger and supply transport in good weather” in 2005, then grounded in May 2006.

                        

By 2007, the project was 6 years behind schedule, costs had risen over 50% to $A 1.1 billion (about $900 million) for 11 helicopters, and the program was being used as a case study in the Australian Defence College’s leadership and ethics course. It’s estimated that at least $A 45 million more and 29 months of work was be required to make them serviceable, with full operational status unlikely until at least 2010. In 2007, Australia’s Liberal Party government elected to continue the Super Seasprite program – but their successor Labor government reversed that decision, and come to an interesting agreement with Kaman. 

NZ has now purchased these aircraft from Kaman.

Original article and further info from Defence Industry Daily