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LeftSkidLow

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Posts posted by LeftSkidLow

  2. Posted

    Here is a short clip from a documentary where you see a Comanche in flight. It looks to be about the same size as the cobra, but I am not sure how much better it performs. But if you can fly sideways at the speed in the video, shouldn't you be able to turn from side to side with the tail rotor at the same speed?

    http://uk.youtube.com/watch?v=zkQJOsqV8rw

    You can fly sideways in an ArmA helicopter, up to around 180 kmph. It has to be initiated from a hover otherwise it wont work, but its more of a quirk in the flight model than a feature.

  3. Posted

    So what you are saying about heli throttle/collective input is that in a modern heli once the pilot spools up the engine and the rotor assemply reatches its correct effective that heli's avonics take over throttle control and adjust the engine's power to maintain rotor head RPM and overcome the drag from changing blade pitch? If that is the case then I was not aware they had become that complex yet, interesting.

    All turbine helicopters, modern or going back as far as 60's work that way and avionics doesn't have anything to do with it. Its just a governor that senses rotor RPM and adjusts the throttle to keep a constant RPM.

    Not really important to know, except a separate throttle would be pointless in ArmA. The problem is the collective as already said, seems take inputs that are either 0% or 100%, there doesn't seem to be much of an in between if at all. The other problem, since we are dealing with collectives and not throttles is the delayed reaction after collective input. I'm so used to it I don't even care anymore but yes, it is incorrect.

  7. Posted

    Quote[/b] ]Why oh why did they have to change the flight model since OFP? Definitely didn't follow the rule: If it ain't broke, don't try to fix it!!

    I think you have a gas leak in your house. The OFP flight model was most assuredly broken.

    The OFP flight model was freaking terrible, ArmA has come leaps and bounds since OFP. ArmA's isn't realistic or perfect, but it isn't that bad, for the most part I can get the helicopter to do what I want without noob restrictions. I have a feeling that most of the guys that say OFP had a more realistic and/or better flight model are using a keyboard and mouse. There are tons of players out there online that can fly great in ArmA now, but there are still a few incompetent ones that are pissed because they use to be the shit in OFP, now they crash all the time because there is no more noob-by-wire flight model.

  9. Posted

    from what I understand, the problem with helicopters and aerobatics has little to do with g forces and more to do with aerodynamic forces causing the rotor to strike the tailboom. This isn't a concern with semi rigid rotors. Also, g forces are only as high as you wish to make them in any aerobatic maneuver. The tighter and faster, the higher the gs. So, if you want to do a relatively low g loop, it's just going to be slow and wide... and there aren't any g force concerns in a rolling motion.

    It has to do with aerodynamics and g forces combined, specifically negative G's. Anytime a rotor disc is unloaded, below 1 and negative G's the blades tend to flap excessively which could take out the tail boom. A semi rigid is the worse possible choice for attempting to aerobatics with because not only is it susceptible to that excessive flapping in low and negative G situations, it is susceptible to mast bumping, there is no limit to how much the blades teeter in a semi rigid until they hit the rotor mast, which usually shears it 2 and separates from the helicopter. A fully articulated rotor head has a droop stop, which is basically a movable plate around the rotor mast that a drooping blade will hit before the mast. A rigid rotor head would be the most favorable in aerobatics because the blades themselves are composite and built to flex, feather, lead/lag, and flap without any hinges.

  10. Posted

    First of all, when a helicopter is in forward flight using your right or left pedals just to turn, (just pressing the x or c button to turn around) this would cause an instant stall. OR If you were flying in a MI24 Hind just applying too much pedal would cut your tail boom in half.

    Instant stall? what is going to stall? I know you aren't talking about retreating blade stall, so maybe LTE but that doesn't involve anything stalling. I don't know anything about Mi-24's but if you jam a legfull of pedal in a Hughes 500 at 100 knots its gonna fly out of trim, if slow down a bit more you can fly that sucker sideways. In ArmA the A/Mh-6's are cruising around 200 kilometers per hour which is about 108 knots and they will barely fly out of trim.

  11. Posted

    Are there any plans for future evolution versions to include an external load script for helicopters? It would work great to get crashed vehicles up in the the northern island by slingloading repair and refuel trucks under a UH-60 to the wreckage area because as we all know AI drivers wont cross the bridge at Corazol, and making two trips with a refuel and repair truck to Masbete could be an hour of driving.

  14. Posted

    Has anyone gotten POV hats to work? I combined a MS sidewinder with a Saitek Graphite (both their own POV hat switches). I'm only using the Saitek Graphite for the pedal axis, I ripped it apart to use one of the potentiometers to make my own pedals. Everything else is mapped to my Sidewinder and works when I go into the control panel except the POV hats.

    I've tried setting 1 and 2 POVs in PPJoy, Ive tried to get it to auto detect when I push buttons but it wont, Ive tested in the control panel and I get nothing. I don't know what to do PPJoyJoy doesn't have any settings for the POV hat switch.

  15. Posted

    The worse thing is people that sit at the ammo box selecting their load out all day. Some people are literally there for minutes and ask for me to wait until they are done, I don't have all day nor do the guys already waiting in my helicopter. Now I just say "mh6 is taking off in 15 seconds get in or walk" sometimes it works.

  16. Posted

    Quote[/b] ]The proportion of mass in a helicopter's spinning rotors is small compared with the amount of mass in its airframe so making analogies with gyroscopes in which all of the mass is spinning leads to huge over-estimations of gyroscopic effects.

    Yeah I think I agree, the most in depth training I've had about gyroscopes when flying helicopters has just been about precession, which would never come into play with ArmA. I'm guessing the problem here is in a hover the fuselage acts more like a pendulum and with significant forward airspeed the fuselage rotates around a different point. I don't even notice it when I'm flying I just do what needs to be done with the cyclic, this whole argument gets a little overboard at times but I'd agree something is a little strange.

  18. Posted

    OK, incontrovertible proof.

    So, here I am flying along in my HueyCobra at speed over Rahmadi, when, oh shit! I accidentally pushed the "dump fuel all at once" button!

    "Good golly cap'n," quips my gunner, "it's a good thing nasty ole Suma and co. programmed this thing with autorotation abilities! And heck, even in the 1.7 beta!"

    "Damn straight," I say as I straighten my trucker's cap, setting the chopper up for a flare and emergency landing.

    Autorotation Video - v1.7 BETA - size, about 6MB.

    Very weird technique but it worked, I've been trying to do them the way they are done in the real world and it doesn't always work. If you did an auto the way you do in the real world, it would still auto rotate all the way down but everyone would die, when you hit the ground. You are doing 0 airspeed autos, which basically use a much higher rate of descent to maintain the same upflow required to keep the rotor RPM in the green. They are only done with very high power recoveries because there is no way to arrest the enormous rate of descent required, well except for hover autos but thats not quite the same. Anyway I have to remember this is Arma and you have to do what works in ArmA not real life, I'll try to get a youtube of the way I'm doing them in a little while.

    Edit: can you upload the fuel script somewhere I get tired of flying for 20 seconds waiting for the fuel to run out.

  19. Posted

    Apparently, gyroscopic precession has been disproven as a primary factor in helicopter flight, and the weirdness of helicopter flight has much to do with the fact that the rotors are semi-free to flap around on hinges. What was previously thought as precession forces are now thought to be just a product of the blades accellerating and flapping around.

    Precession isn't really what Suma was talking about I don't think, for the most part precession is countered by off setting the pitch horns on the rotor head by 90 degrees so that cyclic inputs aren't 90 degrees off. There are areas where precession does affect the cyclic inputs by the pilot but they aren't simulated in ArmA. I think he is mostly referring to the gyroscopic property of rigidity in space, the gyro tends to resist any deflecting force. Its the same reason why attitude indicators (artificial horizon) tend to stay level with the horizon.

  20. Posted

    I managed to get a 180 degree auto from 200m just a min ago, but its all screwed up how rotor RPM builds in arma, I had to do almost the opposite of what you said and slow down my rate of decent with aft cyclic through the turn while bleeding off airspeed and it still almost decayed to the point of no return. This was the only way I could get it to work. In a real auto as soon as you crank in the turn your rate of decent increases because you now are using some horizontal component of lift and not all vertical, as the rate of decent increases more upflow is introduced to the rotor disc and you have to actually check some collective to keep the rotor RPM from exceeding the limits. As you roll out of the turn and begin the flare you have this excessive rate of decent from the turn coupled with exposing the rotor disc to even more upflow from flare itself and just tons of RPM to work with to put it down safe. In arma it just bogs down down down almost too much, then you flare and you are on the deck hard, and thats if you are lucky.

  21. Posted

    it was in 1.05 and only worked for the blackhawks, but then bis commited suicide by releasing 1.07 beta and apparently the autorotation went bye bye.

    plus you need to be going straight for some reason in order for it to work. oh well

    I don't know about the Blackhawks but I was doing autos in the MH-6 last night with 1.07, I did try to do a 180 auto and it just isn't possible your rotor RPM will decay in a turn (which is the opposite of what happens in a real auto).

  22. Posted

    I think quite a few of your suggestions are indeed a bit beyond the scope of a combat sim and more appropriate for a flight sim. On the other hand, anything that increases the value of a player who can actually fly peeps around is great.

    Of all of your excellent suggestions one is sorely and immediately needed: autorotation.

    Please BIS, I don't want a few hits in the engine to be a death sentence for everyone in my chopper. I've tried it dozens of times in the editor, and as other mentioned in other threads, it's near impossible to put a disabled chopper down without exploding on impact. confused_o.gif

    You can auto if you immediately reduce your airspeed to about 110 kmph and bottem the collective. Just ride it down at that speed all the way to about 10 ft off the ground and go full collective, DO NOT FLARE!!! it does nothing in this game. Just slide it in at 110, I know it feels way wrong but its the only way it works and you will damage the helicopter, so if its already badly damaged you are better off ejecting.

    To the original poster, you are right about the collective and rotor wash at flat pitch. And damn it how many people does it take to convince them you have tail rotor authority at higher airspeeds, just tonight I was crossing midfield over an airport and I flicked on the landing then used the pedals to aim the light and find the windsock. The other stuff you mentioned is going a little far though, ETL.... meh maybe, overtorque and overtemp is really going too far though.

  24. Posted

    It's black magic. Some one needs to burn at the stake for this.

    Doesn't the rotor speed change as more collective is added or less collective?

    No, there is a governor that keeps the rotor RPM constant, or at least pretty close. You can see in the video a few times where the main rotor blades appear to move a little, there is a slight delay in the governor as it reacts to collective inputs that increase or decrease drag on the rotor system.

    Some smaller piston helicopters such as a Hughes 300, only have a correlater, which helps increase or decrease the throttle with collective inputs, but some throttle manipulation is also required by the pilot to keep the rotor RPM in the green.

  25. Posted

    I agree to all the reasons (how can I disagree they are factual) the whole Iraq invasion was unfortunately bad timing though, Iraq probably wasn't an imminent threat as far as terrorism is concerned, but now after the invasion the country is a spawn for terrorism. The US probably could have let it go for a for a few more years, but now there is Iran which seems much more hostile and capable than Iraq ever could have been. In reality the whole region is unstable and would love to kill me and all other Americans, all I can say is that hind sight is 20/20 and you have to deal with the situation at hand, which is what the US is trying to do.

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