correct as is MP: Throttle in lockout position @ high altitude generates too much power

[Hammer1-1]

Approaching 10k' altitude and heavy loadout (2x fuel bags, 8 AGM-114, full fuel), pushing the throttle past the lockout position gave me a 2000'/min climb rate. Basically had too much power to make a landing at that altitude, but when backing the throttle down below the lockout I kept getting an engine rpm low warning. I couldnt safely land with it engaged as I kept ballooning and I couldnt safely land without it engaged because I didnt have enough power.

 

https://drive.google.com/file/d/1xM-dt28JUrZg994jnuB7VrTqzjlId2md/view?usp=sharing

[Raptor9]

1) The aircraft isn't meant to be flown in lockout.

2) The aircraft isn't powerful enough to fly at those altitudes with such a loadout.

Essentially you are asking the aircraft to operate beyond it's flight envelope. Helicopters aren't jets. You can't simply max out the collective nor the power levers to make it go faster or higher.

[bradmick]

Because your maximum torque available dual engine at 10,000ft and 20 degrees is 86%.

This corresponds to a maximum allowable gross weight in ground effect of roughly 17,300lbs which equates to a hover torque in ground effect of 86%. Out of ground effect maximum gross weight is roughly 15100lbs.

If you're fully loaded like you say with 3 full bags + 2 external tanks, 8 HF and 300rds of 30mm your aircraft weighs 20,621 lbs. 20,621lbs is over the maximum gross weight for tactical flight of 20,260lbs by 361lbs.

This means you exceed the lift capabilities of the rotor system by 3,321lbs in ground effect and 5,521lbs out of ground effect. This is why you can't hover and keep drooping the rotor.

 

Whenever you take the engines to lockout, you disable the DECU, which for lack of better terms, regulates the main rotor speed (really it's keeping the power turbine at a set speed, which keeps the rotor rpm at a set speed). This means anytime you adjust the collective, the rotor speed will vary wildly. Reducing the collective reduces drag on the rotor causing the rotor to go high, and increasing collective increases drag on the rotor causing the rotor to go low. 

Moral of the story? Reduce weight, don't take the engines to lockout, and the aircraft is acting exactly as expected...because it's not designed to do what you're asking it to do.

Edited July 17, 2022 by bradmick

[Hammer1-1]

2 hours ago, Raptor9 said:

1) The aircraft isn't meant to be flown in lockout.

2) The aircraft isn't powerful enough to fly at those altitudes with such a loadout.

Essentially you are asking the aircraft to operate beyond it's flight envelope. Helicopters aren't jets. You can't simply max out the collective nor the power levers to make it go faster or higher.

I get the point not to fly in lockout...but when I did, I got those results: a 2000'/min climb rate past 10,000' with a full load. Thats my issue at the moment. Is that how its supposed to work? I understand not to do that...but...

 

Edited July 18, 2022 by Hammer1-1

[Raptor9]

When you place the engines in lockout, you are "locking out" the DEC from managing the engine RPM, which manages the rotor RPM like bradmick mentioned above; you also lose Np overspeed protection and TGT limiting functions that are otherwise normally provided by the DEC. Additionally, the engine throttle is opened to max because the power lever is now maxed out. So what you're doing is removing a critical function from your engine and telling it go full throttle without any regard to the rotor RPM. So either you lower the collective to maintain level flight and your rotor speed goes to plaid, or you pull in collective to add drag to keep the rotor within proper RPMs but that also means you're gonna climb.

The point is this. The engines are better at managing themselves than you are, because your hands are full flying the aircraft. If they don't give you any more power it's because they can't; at least not without melting turbine blades or over-speeding the engine, which results in catastrophic failure (hence the two black stripes on the engine nacelles; that's where the turbine blades will shoot outward).