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Hot and High flight model


159_Archer

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Haven't read much here re the operating of the Hind in hotter temperatures, I have been dabbling with it to see what effects they have.

 

Generally, they seem sort of as you would expect, although I am finding that the tail-rotor authority seems very much affected -and trying to hover in a loaded Hind -even when you manage to stabilize your height, ends very quickly in the helo spinning leftwards uncrontrollably. I tried to find info on these things and not found what I was after as yet.

 

Obviously the main rotor won't lift as well and engines not produce as much power in H&H condtions -would the tail-rotor struggle so much that it lost the ability to control directional stability?

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Well, in hot air (especially at high altitudes where it's thin too), you need more power to stay up. More power - more torque - more right pedal needed.

At some point, you're gonna run out of the rudder authority.

 

Also, make sure you're doing this without the yaw stabiliser, I found that it's easy to run out of rudder authority even in -5 weather with that thing on in hover (after a flight, not right after takeoff, there it seems to work fine)

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11 minutes ago, 159_Archer said:

Haven't read much here re the operating of the Hind in hotter temperatures, I have been dabbling with it to see what effects they have.

 

Generally, they seem sort of as you would expect, although I am finding that the tail-rotor authority seems very much affected -and trying to hover in a loaded Hind -even when you manage to stabilize your height, ends very quickly in the helo spinning leftwards uncrontrollably. I tried to find info on these things and not found what I was after as yet.

 

Obviously the main rotor won't lift as well and engines not produce as much power in H&H condtions -would the tail-rotor struggle so much that it lost the ability to control directional stability?

Next time you are doing the hover under the same conditions (hot & heavy), have a look and see what the main rotor rpm is doing. If it drops, you can lose tail rotor authority. 

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The Apache and KA-50 will not do much better Hot and High.... but they will be a little better.

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