Questions about AtoA Hardpoint & Turbine RPM

Hi...

I read manual, but I didn't satisfy actually.

1) You know, there's Air-to-Air missiles hardpoint select button on the collective. Manual says "no function". Well, obviously that's not modelled. But, wondering the reason.

Is that because there's no any airborn missiles but Vikhrs? (When I press the A-to-A button, weapon system selects Vikhrs though.)

2) Can anyone give more info about control selector for re-adjustment of the free-turbine (rotors) RPM governor. In which situations am I suppose to use it?

Thank you very much...

1) Planning for future upgrade, exactly like the IRIS switches in the AH-64A, they are there, but they don't do anything. And as it turns out, what they were meant to do never materialized.

2) Nominal is for most situations. Low RPM is for extended descents. It allows you to descend faster without overspeeding the rotor.

Thanks for reply AlphaOneSix.

I don't know anything about IRIS switches in the AH-64A. I'll research it. Thanks.

...Low RPM is for extended descents. It allows you to descend faster without overspeeding the rotor.

That's nice. I must try something... Is this some kind an engine-break that we know from our cars?

Thanks for reply AlphaOneSix.

 

I don't know anything about IRIS switches in the AH-64A. I'll research it. Thanks.

 

 

That's nice. I must try something... Is this some kind an engine-break that we know from our cars?

With regard to the IRIS on the Apache, it was just a possible future upgrade for an infrared imaging system that was never actually implemented. It is only relevant because, like the air-to-air hard point switch in the Ka-50, the switch was there for an upgrade that never happened.

Regarding the rotor RPM switch. The engines have governors (not the electronic governor that you switch on in the cockpit, bu the hydro mechanical fuel control unit) that try to keep the rotor at a preset RPM. During a descent, the rotor RPM will creep up and so the engines will reduce power to keep the rotor at the preset RPM. Once you get to a certain rate of descent, the rotor RPM will begin to rise above the normal setting due to autorotational effects, but because of the way the engine fuel control works, it wil not reduce power any more. The low RPM setting allows the fuel controls on the engines to use a lower preset for the rotor RPM, so when it rises in a rapid descent, it will rise into the normal setting instead of rise above the normal setting. This is really only useful in extended descents, because if you need to quickly add power to maneuver, it can take a couple of seconds for the engines to "ramp up" when switching back to the nominal setting. Once you experiment with it in the game you will see pretty quickly how it works.

There is an overrunning clutch where the engines input into the intermediate gearboxes. These clutches allow the rotor to spin freely if an engine dies without having to turn the dead engine. However, as long as the engine is producing power, you do not want the rotor to "overrun" the clutches, because any sudden decrease in rotor speed (which would happen if the collective were raised slightly) will result in "slamming" the clutch. During engine start, it does the same thing, but it happens very slowly, but having it happen in flight can cause damage to the overrunning clutches? By setting the rotor RPM switch to the low position, you effectively allow engines to try to keep the rotor at a low RPM so the rotor doesn't speed up too much and overrun the clutches. This is only a concern in a descent because the engines are running at very low RPM and it is not so hard to get into this situation.

It would be really great if there are some future features in the works... :thumbup:

Like this or the Mak MWS system.

Thank you again for information AlphaOneSix. :)

And, this is additional question.

Is there any plan about MWS Laser Jam Prot switch's functionaly in the future?

Thanks. :)

And, this is additional question.

 

Is there any plan about MWS Laser Jam Prot switch's functionaly in the future?

 

Thanks. :)

I started a thread about forgotten avionics and systems over a month ago:

http://forums.eagle.ru/showthread.php?t=92023

Some good info there.

Oh! I missed it.

Thank you.

 

2) Nominal is for most situations. Low RPM is for extended descents. It allows you to descend faster without overspeeding the rotor.

Autorotation as well? (i've been away so not quite sure if i remember)

No, the switch affects how fast the engines push the rotors. During autorotation, the engines are not pushing the rotors.