Globe Cargo

"Hi Fellow Polar air pilots, Here is another question if someone could help! Everyone hates that while on cruise you leave even for a while and return to find you are back at the original gate due to a overspeed crash. I do understand about how to save it especially long hauls, but the more important question is HOW TO AVOID the crash? Is it due to weather change, thus pushing the aircraft over it limit? Turbulence? If so, how do we view those changes if possible? and then avoid it from happening. I hate to just take off crash limit to avoid this! Any suggestions on your experience would be great. Thanks and Best <!--emo&:)-->[img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]<!--endemo--> Dennis <!--emo&:D-->[img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]<!--endemo--> 1050"

"According to the to Bernouli principle [I haven't learned physics in Enlish, sorry for calling a principle what is a law etc.], the lift force is proportional to squared velocity of the aircraft. So, if during a cruise a/c's velocity will change, the force acting on a/c hull will also change. If such a change is large and rapid, a/c hull integrity may be threatened. [Imaging holding a model airplane by its wingtips, and suddenly pullling it up. Done quickly enough will damage the model] A/c hull is designed to fly at certain speeds, so when the speed and therefore the lift force rises above critical values, its hull integrity may well be lost. Which in FS results as ""Aircraft overstressed"". [however, the mechanism is poor.] Speaking of the FS.. It is known, that in this simulator wind speeds change just like that. It is not ""as real.."" as it should/could be. However, the rate of change can be slowed down via FSUIPC or ActiveSky, or any other thing. Doing this makes it more real-life and helps avoid o/stress problems."

"<!--QuoteBegin-DennisM+Dec 27 2004, 06:11 AM--><div class='quotetop'>QUOTE(DennisM @ Dec 27 2004, 06:11 AM)</div><div class='quotemain'><!--QuoteEBegin-->Any suggestions on your experience would be great. [right][snapback]2594[/snapback][/right] <!--QuoteEnd--></div><!--QuoteEEnd--> Dennis, I had this haapen once or twice - particularly when I had ""real"" weather turned on - it seems to happen when a weather update occured with a major change of wind direction. So from (say) a tail wind of 40 knots suddenly get an instantaneous head wind of (say) 50 knots - not realistic and unless you act QUICKLY (throttle back & climb to drop speed) the wings fall off. I have used fsuipc to cut back allowable wind speed changes and direction changes to very low rates - since then I don't appear to have the symptoms of the problem but as they say ""absence of evidence isn't evidence of absence"" so maybe this change is just a coincidence. I have also turned the crash detection OFF - it was unrealistic - particularly on the ground when an AI aircraft pushes back in front of you when you are taxying. "

"Thanks Barry and unknown help, Yes, I agree with you on those causes, I will try to change the rate of change and hope it gets better. Yes, last resort is to turn off crash limit, but. Thanks again, and happy flying <!--emo&:D-->[img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]<!--endemo--> Dennis"

"Dennis: One other thing I can add is a program called FSMeteo will give you a winds aloft and temperature forecast which helps. Along with FSUIPC, it may help you anticipate any major weather changes. It's also great assistance for fuel planning and getting the weather for your destination airport in advance. Bob 1168"