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HeliTorque :: View topic - Power check while flying before going into a confined area.
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HeliTorque Forum Index » Flight Dynamics

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Power check while flying before going into a confined area.
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raffski
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PostPosted: Wed Sep 07, 2005 1:59 am    Post subject: Power check while flying before going into a confined area. Reply with quote

Can someone explain to me how to do a power check, before attempting to go into a confined area. I was shown this once, and it didn't stick in the brain, but there was a lot going on at the time. Is it R22/R44 specific, or is the mechanism the same for all types?
Thanks,
pete.
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Ascend_Charlie
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PostPosted: Wed Sep 07, 2005 10:08 am    Post subject: Reply with quote

Fly past the CA at minimum power speed, straight and level, and see what your power is. Then check the placard for the alt/temp and see what your max allowable power is. Then pull that power to confirm you can get it. If the margin is 6" MAP, you can hover OGE. 5" is an easy IGE hover, 4" is getting iffy. If 3" or less, forget it.

These numbers only work for a piston engine - turbines have further factors with N1, torque and TOT limits, so rules of thumb don't really apply.
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PostPosted: Wed Sep 07, 2005 10:09 am    Post subject: Reply with quote

May I suggest you ask an instructor!

However...

It's the difference between the bottom of the power curve (X knots) and the max power available. Slow down to the speed for the bottom of the curve and note power in use (manifold pressure). Now in the CBi you pull the collective to see what power the engine can produce (whilst pointing the nose down to keep level) and note that. So it takes 20" to fly at X knots and you can actually produce 27" of manifold pressure before you over-pitch, so you have 7" of power available - enough for any landing you like. However on a hot, high day you might only have, say, 4" in hand which means you will have to do a zero speed landing...

Bassically:
7" = OGE hover
6" = normal IGE approach
5" = low hover
4" = zero speed
less than that = run on landing

(Edit: Ascend Charlie beat me to it by a minute!)
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raffski
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PostPosted: Wed Sep 07, 2005 1:01 pm    Post subject: Reply with quote

Thanks for the replies. I'm in Kazakhstan for the next three weeks so I don't exactly have an instructor to ask. I thought I'd use the power of the interweb to get the answer to something that's been bugging me. I wanted to have it clear in my head before I did it next, which will be with an instructor.
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