Average route winds

[Guest Edwin]

Hi, I'm using Build 174 and I think there may still be a problem with the average route winds calculation. See below for a flight plan from VHHH to WSSS. The winds seem to be mostly from the W, then S and then SE. And yet, the average route winds are 328/40 - the NW. Seems a bit strange.Thanks,EdwinVHHHPORPA 7.1 79 77 265 85 -39.5 450 534 1Fix01 2.4 128 135 265 85 -39.5 450 510 1BREAM 31.9 181 191 265 85 -39.5 450 436 4PERCH 17.8 206 215 265 85 -39.5 450 402 2SANDI 67.4 190 200 265 85 -39.5 450 423 9EPDOS 84.4 188 198 265 85 -39.5 450 425 11ENBOK 26.8 188 196 266 71 -39.9 450 431 3EPKAL 51.8 217 223 266 71 -39.9 450 401 7EGEMU 64.2 218 224 266 71 -39.9 450 400 9EXOTO 121.3 216 223 266 71 -39.9 450 401 18VEPAM 103.2 216 218 281 19 -41.3 450 441 14KARAN 93.0 212 214 281 19 -41.3 450 442 12PTH 121.2 211 212 277 15 -41.2 450 443 16ELSAS 56.5 213 214 269 11 -41.1 450 443 7CS 100.2 212 213 269 11 -41.1 450 443 13ESPOB 121.8 211 212 269 11 -41.1 450 444 16ENREP 149.5 211 210 192 8 -41.1 450 442 20VEPLI 60.6 188 187 136 7 -41.3 450 445 8EGOLO 33.1 188 187 136 7 -41.3 450 445 4VMR 56.9 188 187 136 7 -41.3 450 445 7VJR 42.2 200 198 113 12 -41.4 450 449 5JB 14.8 158 156 113 12 -41.4 450 441 2SJ 18.7 152 151 113 12 -41.4 450 440 2FF02L 4.4 85 86 118 16 -41.5 450 436 1WSSS 7.8 22 24 118 16 -41.5 450 451 1 ----- ----- 1458.9 193m 3.22HAverage Route Winds for 37000ft: 328/40

[Guest Edwin]

Nobody has any ideas? Or perhaps it's because the table isn't aligned so it's hard to see what I'm talking about? I'll try to make things easier below:(Format: Waypoint - WDIR WSPD)PORPA - 265 85Fix01 - 265 85BREAM - 265 85PERCH - 265 85SANDI - 265 85EPDOS - 265 85ENBOK - 266 71EPKAL - 266 71EGEMU - 266 71EXOTO - 266 71VEPAM - 281 19KARAN - 281 19PTH - 277 15ELSAS - 269 11CS - 269 11ESPOB - 269 11ENREP - 192 8VEPLI - 136 7EGOLO - 136 7VMR - 136 7VJR - 113 12JB - 113 12SJ - 113 12FF02L - 118 16WSSS - 118 16Any ideas would be much appreciated.Many thanks in advance.Edwin

[Vulcan 14]

Edwin,If you reduce those winds to 2 components you get an approximation of 269@55 and 130@11The SE winds are 1/5 the strength of the Westerly winds so I would expect something in the region of 240 degrees not 328You can do a vector diagram using rule and protractor to get a closer approximation.See my earlier post on average winds for a link to a web site on how to construct vector diagrams.HTH

[Guest Edwin]

Thanks Vulcan. That confirms my suspicion.Jim, could you please get Damian to look again at the calculation?Thanks again.Edwin

[JSkorna 137]

Hi,Will do. Keep in mind that he has some real-world stuff happening in the next few days.Hope this helps,JimActiveSky Supporthttp://www.hifisim.com/images/as2004proudsupporter.jpg

[Damian Clark 1,239]

Hi all,Well we had quite a few success reports in B174 for average route winds, but it is apparent the calculations aren't sophisticated enough to handle all situations. Indeed, the wind speed is not correctly considered in determining the displayed average, and this is throwing things off especially when you have large variations in speed.We will re-design this but it may take a little time, as we are currently deep into final coding of the next major version upgrade, and as Jim mentioned, I have some other personal priorities that will keep me busy over the next couple days.Vulcan and those who have been testing this, please send me an e-mail in about a week, I will send you a build with the re-designed calculation and we can test it a good deal before providing an official update. Your help is much appreciated!Thanks all..