FS2004/FSX CA-15 experimental fighter
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Australia's CA-15 was one of the fastest the fastest Piston-Engined Fighter in the World. On the afternoon of May 25 1948 a silver aircraft flew over Melbourne at an unprecedented 502mph. This aircraft carried a number of innovative design features, performed very well, and was considered by many people to be the ultimate piston engined fighter. The brainchild of Lawrence Wackett, head of the Commonwealth Aircraft Corporation (C.A.C) it was totally Australian in design and manufacture. It was the CA-15, and was to be a long range, high altitude, high performance fighter.
By May an engine had been obtained and a mock-up constructed. This was shown to the RAAF and upon approval the design was frozen. By June, plans for development and production were rapidly advancing and the P&W R-2000-21 engine was decided upon as the powerplant.
During this period Lawrence Wackett was touring extensively in the UK and the USA examining in detail their aircraft manufacturing methods and design philosophies. Upon his return in mid 1943 he recommended that the P-51 Mustang be license built here, and the CA-15 be developed "...as an exercise to keep alive the spirit of design, rather than as a war weapon for urgent development." To this end, some of the most promising younger design engineers were put onto the project and the whole thing given a low priority.
Also as a result of this trip Wackett decided to redesign the CA-15 as a low altitude fighter around the P&W R-2800-10w engine. There were two main reasons;
Firstly, he had become convinced that a fighter powered by a radial engine, even a turbocharged one, was more suited to low altitude work.
Secondly, he saw no advantage in developing an aircraft in competition to the Mustang which CAC was soon to start building. This change meant a large re-think in design, and was expected to delay production by about twelve months.
In August 1943 the RAAF issued specification no. 2/34 which covered the CA-15, and work once again advanced rapidly. By the end of the year an engine installation mock-up had been built, and detailed specifications were issued down to the smallest item.
Early 1944 saw rapid progress in the manufacture of prototype components and preliminary construction. An R-2800 engine was obtained in March, and in April the last major design feature was finished. This was an innovative integrated radiator system that served both the oil system and the intercooler. Calculations indicated that this would give better results than any other radial engine installation in the world.
Then on May 15 a cable arrived from the United States informing CAC that the R-2800-10w engine was no longer being produced. The replacement chosen was the R-2800-57w. This was a high altitude version of the motor, and once again necessitated a redesign. Work continued until by August, 75% of the detailed tooling and 85% of the assembly jigs had been completed. Then, again on the fifteenth, disaster, in the form of another cable, struck. This cable baldly stated that R-2800-57w engine delivery could not be guaranteed.
After much deliberation the Rolls Royce Griffon 120 motor was chosen in September. Before any major work could begin however the project was cancelled by the Aircraft Advisory Committee. Despite this, CAC continued with development at a much reduced rate, whilst lobbying fiercely for the projects re-instatement. It was granted on December 12 1944.
By January 1945 the Australian government had become tired of the whole project and supported it in a very listless manner. In contrast the British Air Ministry upon looking at the design was greatly impressed, and immediately lent the project two Griffon 61 motors for use until the Griffon 120 became available.
The motors arrived in April, and were in place in the airframe and run in December. The decision to fly the 61 series motor came when the production of the 120 series was cancelled due to the end of the war.
February 1946 saw the beginning of taxying trials for the CA-15, an aircraft that "...must be regarded as the leading example in proven technique in fighter design..."
Then after a few minor adjustments, the first flight of fifteen minutes duration was undertaken by CAC, and the aircraft logged 16.75 hours in the following twenty three flights. During this period a number of RAAF test pilots flew the aircraft. One commented "... The aircraft is easy to fly and has no apparent vices...The engine installation is very good, being by far the best Griffon installation I have ever flown behind."
On July 2 the RAAF took charge of the aircraft, and began its test program at 1APU (Aircraft Performance Unit) Laverton. On December the tenth, whilst temporarily re-located at Point Cook, an hydraulic failure resulted in a wheels up landing.
Seeing it as a one off prototype with no future the RAAF reluctantly gave permission to repair the aircraft in April 1947. The job was given low priority and it was thirteen months before the CA-15 was again ready to fly.
From this point only a very limited test program was run, the only significant flight taking place on May 25 1948 when Fl.Lt. J.Archer gently dived 4000 feet over Melbourne, levelling out at 5000 feet and at a speed of 502.2 mph.
With a level flight speed of 448mph, the CA-15 was one of, if not the fastest piston engined fighter in the world. It certainly outperformed the P-51 Mustang (which at that stage was our primary fighter). It also outperformed the Spitfire XIV in a number of areas, most notably load and range.
This was the last totally new piston engined fighter to undertake flight testing anywhere in the world. In that light, that it was arguably also the best fighter in the world is not surprising.
However the jet age had arrived, and for piston engined fighters this was the end of the line. So you ask, where is this marvellous Australian aircraft displayed? It isnt. With criminal short-sightedness, the decision was taken to scrap it in March 1950. This was done in May of the same year.
Specifications
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Length: 36 ft 2.5 in.
Height: 14 ft 2.75 in.
Wing Area: 219.4 sq ft.
Engine: Rolls-Royce Griffon 61 12-Cylinder liquide cooled Vee engine with two speed / two stage super charges.
Fuel: 260 imp gal.
Loaded Weight:10,764 lb.
Maximum Speed: 405 mph at see level; 495 mph at 26,500 feet.
Service Ceiling: 39,000 feet.
Rate of Climb: 4,400 ft min.
Armaments: 2 x .50 cal. Browning machine guns each with 250 rounds.
2 x 20 mm Cannon
Provisions for 10 rocket projectiles; two 500 lb bombs; two 1,000 lb bombs; under the wings.
Range: wing tanks only 1,150 miles at 5,000 ft.
With fuselage and drop tanks 2,540 miles.
CREDITS
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Special thanks to :
-GMAX for the drawing program and Microsoft for their makmdls.mdk.
-To Nicholas McColl, who created the original 3D mdl.
Installation:
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-Unzip "Ca-15" into a temporary file and move the "Ca-15" folder into the main Aircraft directory.
-Attention...the panel.cfg files are different for FSX and FS2004.
-For FSX,change the FSXpanel.cfg into panel.cfg and let it replace the first one.
For FS2004,change the FS9panel.cfg into panel.cfg and let it replace the first one.
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-Read instructions carefully when installing the gauges. Say YES...when asked if the gauges sources should be trusted. If you say no....most of the gauges are not going to work !
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-Leave the "instruments" map in your panel folder.
-Copy the effects and the 20can.wave into the Microsoft Games\Flight Simulator X\effects folder.
ATTENTION :
-For FS2004, change the FS9_Wing_Guns.fx into fx_Wing_Guns.fx
-For FSX change the FSX_Wing_Guns.fx into fx_Wing_Guns.fx
-If you don't like the mdl reflective, you can unzip and use the Noshine.mdl.
-Possible problem; In some FSX installations, all textures may not show when flying. This fault is due to the original 3d.mdl.
Effects
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-On startup there is automatic engine smoke.
-Then follow the exhaust flames with smoke.
-Wing vortex effect appears by default at 2.5g or quick roll rate.
-Continuous blue flames with smoke if engine is running .
-Wing cannon with flash, smoke and falling cartridges can be triggered with the standard Strobe key (O).
It is much nicer however if you put the FS2004 standard Strobe key (O) to the trigger from your joystick.You can change this in the Key menu.
It is a good idea if you replace the standard (L) key for lights by the L+CTRL, (normaly activating the landing lights only). This avoids you having to have all lights on when pulling the trigger.
LEGAL:
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The project is released as freeware. You may modify it and repaint it. You may upload this file to another website as long as it is not for profit.
You need the written permission of the original authors to use any of these files for commercial purposes, otherwise a simple credit would be nice. Non commercial repaints-remakes are welcome but I would appreciate very much receiving a copy of your model.
This file should not cause any problems with your computer, but I accept no responsibility if you think it does
Happy Landings!!
A.F.Scrub
August 2008
Email: af_scrubbypc@hotmail.com
