cobrabase Posted November 30, 2021 Posted November 30, 2021 Anyone mind troubleshooting my cold-start checklist? I am getting generator failure as soon as I get into the air. [sIGPIC][/sIGPIC]
Jansgi Posted November 30, 2021 Posted November 30, 2021 Couple of suggestions. 1. Try taking off without anti-ice turned on. 2. If heavy, do a rolling takeoff. 3. Avoid using excessive right rudder on takeoff. AMD Ryzen™ 5 5600X AMD Radeon™ RX 7800 XT G.Skill 64GB (4 x 16GB) Trident Z Neo DDR4 3600MHz
gazpad Posted November 30, 2021 Posted November 30, 2021 You are forgetting the fan Jokes aside, you are still rather fast on increasing rotor pitch. Give the governor a second or two to stabilize the rotor rpm every few degrees of rotor pitch, especially when you are becoming light on wheels. For the tail rotor, dont let a yaw develop. You need more power on the tail rotor to stop a developed rotation than just holding it steady. The moment you are pushing the right pedal hard, your rotor rpm drops to a level where generators are turning off. You are doing it right in general, just try slower and smoother!
admiki Posted November 30, 2021 Posted November 30, 2021 Also, make sure that your throttle is at 100%. Even with anti-ice and dust protection engines should be able to maintain RRPM at that pitch setting.
Boosterdog Posted November 30, 2021 Posted November 30, 2021 I can’t see anything wrong with the start up. Is that a self made mission? If so are you overweight? Anti ice and dust filters likely take a lot of power and reduce your overall max permissible weight by quite a lot. Certainly my experience from the mi8 and I presume they do the same on the hind. High fuel load? Weapons? Too much vodka in the back? I tend to listen for that tone drop when lifting the collective. Once it starts I stop and wait. MSI Tomahawk X570 Mobo, Ryzen 5600X undervolted on Artic Freezer E34 Cooler, RTX3080 FE, 32GB (2x16GB Dual Ranked) GSkil 3600 CL16 Trident Neo RAM, 2X 4th Gen M2 SSDs, Corsair RM850x PSU, Lancool 215 Case. Gear: MFG Crosswinds, Warthog Throttle, Virpil T50CM gen 1 stick, TIR5, Cougar MFD (OOA), D-link H7/B powered USB 2.0 Hub all strapped to a butchered Wheel stand pro, Cushion to bang head on, wall to scream at.
admiki Posted November 30, 2021 Posted November 30, 2021 Did a quick test. Dust protection doesn't affect engines much, but anti ice will drop performance quite a lot. If your load is mission critical, only solution is to do rolling takeoff and keep your eye on rotor pitch gauge.
cobrabase Posted November 30, 2021 Author Posted November 30, 2021 (edited) Thanks guys. I will try it without anti-ice tonight and see how it goes. What is the power draw on the generators from the various systems? Does air conditioning draw power? Edited November 30, 2021 by cobrabase [sIGPIC][/sIGPIC]
Rabies Posted December 1, 2021 Posted December 1, 2021 When you are pulling in the collective, watch your rotor rpm, it’s dropping to the point the generators are falling offline. As mentioned above, your are probably at max-weight or above, rolling takeoff is the way to go. You could share your mission file so we can replicate your takeoff.
admiki Posted December 2, 2021 Posted December 2, 2021 10 hours ago, Rabies said: When you are pulling in the collective, watch your rotor rpm, it’s dropping to the point the generators are falling offline. As mentioned above, your are probably at max-weight or above, rolling takeoff is the way to go. You could share your mission file so we can replicate your takeoff. Like I said, it tested it. 300 kgs ovet MTOW. With anti ice, I would lose generators. Without anti ice, no problems whatsoever. I might be wrong, but I believe anti ice system is the same as from Mi8, in other words it's electric heating of intake. That shouldn't cause that much of power loss. On the other hand, dust protection system is taking some compressor air from the engines to blow dust away from intakes. That will cause power loss on Mi8 , but has no effect on Mi24 whatsoever. 1
AlphaOneSix Posted December 2, 2021 Posted December 2, 2021 3 hours ago, admiki said: I might be wrong, but I believe anti ice system is the same as from Mi8 The engine anti-ice is the same. However, the anti-ice bleeds air from the engine compressor, so you'll lose some power.
SnuggleFairy Posted December 4, 2021 Posted December 4, 2021 @cobrabase there are a couple non essential switches you missed, but overall you're not doing anything wrong with the startup. Try this again and watch the blade RPM needle. If the needle drops below the bottom yellow line, the generators (they are tied to your main rotor) will not generate enough voltage and you'll get the failure warning. That happens if your engines don't generate enough power to overcome the load on your main rotor and keep the blades spinning. What's causing you specific situation is a number of factors: 1) Weight - even just at full fuel and no armament, you're pushing the engine limits in a hover. Hover take offs have very narrow power margins and i, personally, do rolling take offs like 90% of the time 2) Anti-dust eats minor power % from your engines 3) Engine Anti-ice eats a ton of power from your engines - this one is really a huge difference. But yeah basically you're fine, it's just the helicopter is struggling to get itself off the ground and you gotta find a way to help it. Like do a rolling take off, or reduce weight, or shut off deice On 11/30/2021 at 10:04 AM, cobrabase said: Thanks guys. I will try it without anti-ice tonight and see how it goes. What is the power draw on the generators from the various systems? Does air conditioning draw power? Air conditioning is supposed to draw power, but I don't believe it does at this time. Or the difference is just unnoticeable
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