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So do real world helicopter pilots


XarBat
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In the UH60, you do spool the engines before opening the cutoff valve. Think about it, jet engines ignite fuel through a mix of air and pressure, if fuel is sucked in before the compression is right for initial combustion there would probably be a big flame of unburned fuel coming out the back.

 

Hope this helps.

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Well, if they fly a Robinson R-22 (or 44) they don't. But that's because that thing's using a bog-standard piston engine, not a proper manly turboshaft. :)

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If this is about the Ka-50 the proper procedure is to open the valve switches before beginning the start up procedure (or at least for that engine) and controlling the initial fuel flow with the cutoff levers open at 20% Ngg. The starter will only go up to 20% RPM before given fuel so let it get there and stop for a second before opening up the fuel levers.

 

It's all as TL says, you want to have a good air flow and immediate ignition when fuel is introduced to prevent any pooling of fuel which could cause a violent ignition. At the very least a violent ignition is hard on the aircraft if not causing a flameout or even a safety hazard.

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Military jets use the same procedure. Engines spool up to around 15 or 20% before fuel is applied otherwise you get a "wet" start (which results in a spectacular flame out the back) Most modern jets have an autostart procedure which does this automatically, but older types such as Tornado Gr1, Jaguar, Phantom you have to open fuel at the right time, otherwise (as I said previously) you get a wet start.

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