Kula66 Posted December 1, 2008 Posted December 1, 2008 What situations should be avoided to not suffer this? I've ready another thread on the subject but this is more about the balde physics. A few times I'm been 'flying' without doing anything too dramatic (flying up a valley) and suddenly the blades seem to have come apart (no baad guys around). From the cockpit guages I can't see anything too bad - no over-speed, blade RPM ok etc. Any ideas? I'm obviously missing soemthing fundamental!
Acedy Posted December 1, 2008 Posted December 1, 2008 High-speed forward flight and violently kicking in right rudder. [sIGPIC][/sIGPIC] *** SERVMAN SERVER MANAGEMENT MOD V2 FOR DCS:BS V1.0.1 *** *** VERSION FOR FC2 ***
RapidFir3 Posted December 1, 2008 Posted December 1, 2008 What situations should be avoided to not suffer this? I've ready another thread on the subject but this is more about the balde physics. A few times I'm been 'flying' without doing anything too dramatic (flying up a valley) and suddenly the blades seem to have come apart (no baad guys around). From the cockpit guages I can't see anything too bad - no over-speed, blade RPM ok etc. Any ideas? I'm obviously missing soemthing fundamental! I'm not sure but could the problem be that the rotor blades get affected by ice and break. I have been couple of times so high that i got the warning light in cockpit suggesting using the rotot de-icing system to prevent any damage. Obviously i put it on so i dont know what happens if i dont. Callsign Lycanthrope79
Kula66 Posted December 1, 2008 Author Posted December 1, 2008 I'm not sure but could the problem be that the rotor blades get affected by ice and break. I have been couple of times so high that i got the warning light in cockpit suggesting using the rotot de-icing system to prevent any damage. Obviously i put it on so i dont know what happens if i dont. Could be ... I was in a mountain pass after 20mins flying time ... I'll track down the warning light! Thanks. Acedy, What counts as high speed 290kph or 200+?
Acedy Posted December 1, 2008 Posted December 1, 2008 Just tried it, flying straight and level at sea level with a fully loaded heli, 200kph is okay, 250kph is okay, but kicking in right rudder at 280kph caused the blades to crash. Note, this was still within speed limits, so no overspeed warning. [sIGPIC][/sIGPIC] *** SERVMAN SERVER MANAGEMENT MOD V2 FOR DCS:BS V1.0.1 *** *** VERSION FOR FC2 ***
Shrubbo Posted December 1, 2008 Posted December 1, 2008 It doesn't seem to be very happy with you pulling over 3g "air wolf" maneuvers either ;) i9-9900K,Z390 Aorus Master, 32GB GSkill Trident F4-3600 DDR4, ROG Strix RTX 2080 Ti, Oculus Rift S. Thrustmaster Warthog T&S, TPR Pedals.
Draco Posted December 1, 2008 Posted December 1, 2008 Are you sure Rotor RPM was good? Because I managed to replicate blade collision at high airspeed, low rotor RPM, and high Blade AoA regardless of Alt or Temp. As The RPMs decay there's less centripetal force holding the blades level allowing them to flap more. At high forward speed the rising advancing blade and the drooping retreating blade will come in contact with spectacularly bad results. I've also found that sudden left then right rolls will tear the blades off. But I don't have an exact explanation for this yet. Helicopters don't like to do anything fast... except crash.
Shrubbo Posted December 1, 2008 Posted December 1, 2008 Actually Draco reminded me of something else I did. In one of my custom "free flight" missions I had the turbulence and wind speed right up. On shutdown when the rotor rpm dropped way way down (Turbines were off, rotors were just about spun down) the blades collided and ripped themselves off. Centripetal force does seem to effect the blades as it would in real life, lol I love this sim:thumbup: i9-9900K,Z390 Aorus Master, 32GB GSkill Trident F4-3600 DDR4, ROG Strix RTX 2080 Ti, Oculus Rift S. Thrustmaster Warthog T&S, TPR Pedals.
Draco Posted December 1, 2008 Posted December 1, 2008 It's called "Blade Sailing." I seem to remember being told that in the helicopter I fly it can lead to blades cutting off the tail boom or coming into the cabin. Ooh! I've been meaning to try and get into ground resonance I'll go give that a shot... lets see how many ways there are to rip the blades off.
therion_prime Posted December 1, 2008 Posted December 1, 2008 Loopings and barrel rolls with high collective = bad :music_whistling: My DCS movies:
Tango Posted December 1, 2008 Posted December 1, 2008 Ooh! I've been meaning to try and get into ground resonance I'll go give that a shot... lets see how many ways there are to rip the blades off. Been there purely by accident; unable to replicate it! I'd like to know how you get into it! Best regards, Tango.
Walsh Posted December 1, 2008 Posted December 1, 2008 This explains everything! I think a few times I had trimmed with a lot of rudder and was trucking along, then SNAP! rotor blades flying everywhere. Thanks for clarifying this!
Kula66 Posted December 1, 2008 Author Posted December 1, 2008 Are you sure Rotor RPM was good? Because I managed to replicate blade collision at high airspeed, low rotor RPM, and high Blade AoA regardless of Alt or Temp. I'm fairly sure it was above the lower mark, but thanks for suggestion, I'll check the 'high blade AOA' next time.
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