Mark The Droner
Second Officer
Flight distance : 2917 ft
United States
Offline
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In many ways, it depends on your flight. You might fly out several miles with a 20 mph head wind with complete confidence because you can ride the wind back home. OTOH, if you ride a 20 mph tail wind out and pass the edge or range, your Phantom will RTH in its very slow RTH speed, and it may be a very long wait before you can take control because it will be fighting that strong head wind with limited AC speed. In fact, it may never get back into range. Strong cross-winds are dangerous too because they tend to drain the battery and also blow you off track. You really need to plan your flight very carefully when the wind gets over 15 mph.
You also have to make sure you have an ACCURATE wind forecast.
This is the main weakness of uavforecast. I do like uavforecast, but sometimes the wind direction is forecast incorrectly because it uses NAM exclusively, and the trouble with NAM is it doesn't give wind forecasts for 400 feet elevation. NAM will give you the surface wind, and it will give the 300 meter wind. But nothing in between. So if you are using uavforecast and you want a 400' wind forecast, uavforecast will estimate the wind speed between the surface and 300 meter. But they will use the NAM surface wind direction exclusively. This is okay most of the time, but sometimes the wind at upper elevations is a completely different direction than at the surface. It could be a 60-90 degree difference, and I've learned this the hard way. That is why I couple uavforecast with windytv.com. Windytv.com allows me to see forecasts in the EURO, GFS, and the NAM. And both EURO and GFS will give a wind forecast for 100 meters, that is, 330' which is a lot better than a surface wind forecast. And it will be more accurate than the NAM. So with all three models, I can make a better assessment of what the wind will be before I make a run. |
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