TYPHOON PILOTS REQUEST PERFORMANCE DEPARTURES IN FROSTY, ICY CONDITIONS • ALWAYS BLUE SKIES UP THERE

RAF Coningsby Typhoon pilots request a "Performance Departure" (Performance Takeoff) in their Typhoon FGR4 in snowy, frosty and icy conditions. BUT, one thing is for sure, no matter the weather, it is always blue skies up there. The visibility is rather poor though.

The Eurofighter Typhoon is powered by Rolls Royce EJ200 engines which is a low bypass (bypass ratio 0.4:1) engine with 3 Low Pressure and 5 High Pressure compressor stages which compresses the air to 26 times! The EJ200 sits as far back as the last 20% of the fuselage, this means a long tube of air intakes. After the hottest part of the engine after the fuel injectors are, this is pretty much it for a conventional everyday jet engine which for the EJ200 produces around 15,500lbs of thrust. However, the powerful Rolls Royce Eurojet engines can blast out another 30% more power by whacking on the reheats (Afterburners) to deliver a total of 20,000lbs of thrust each with burners!

Whether the weather is less emotional or blue skies, when pilots are executing a PTO, from the moment of releasing the brakes with full reheats on, get to 180mph (not even past the arrestor gear) and pull into a 60 degree and vertical climb. Practice QRA's are also done like this but not always vertical. Not all PTO's mean that they go into vertical climb on departure, it's actually all about the climb rate and not the vertical climbing aircraft. It is max thrust to gain speed to get to where they need to go fast. This means coordination from an Air Traffic Controller because they have a fast moving aircraft in a short space.

Aircraft have to request a Performance departure, they are not allowed to execute it without the clearance from ATC. There are many reasons for PTO, such as a short runway, clear aircraft traffic, barriers, problems on runway, or even just to get to somewhere fast.

Both the Typhoon and English Electric Lightning had similar performance where the thrust to weight ratios of both aircraft were a 1:1 ratio, allowing the aircraft to accelerate vertically. The Lbs of thrust produced from the aircraft was more than the weight in Lbs of the aircraft. Of course, the more payload, the less acceleration, but with this sort of power, it doesn't bother them too much.

Reheats or Afterburners?
Both are the same thing but “Afterburners” is a US term and “Reheats” is a UK term.

RAF Coningsby, TED HQ, in Lincolnshire is one of two RAF Quick Reaction Alert (QRA) Stations which protect UK airspace. RAF Lossiemouth is the other. There is also a third out in the Falkland Islands at RAF Mount Pleasant which 1435 Flt protect the airspace there.

29 Squadron are based at RAF Coningsby in Lincolnshire, one of two Quick Reaction Alert (QRA) stations in the UK. During World War One, 26 of the pilots had achieved 'Ace' Status. Aircraft flown have included the Mosquito, Phantom and Tornado F3. Today, 29 Squadron are known as an Operational Conversion Unit (OCU) who train RAF combat air pilots on the Typhoon, ready for front-line operations.

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