时间:2011-04-05 11:37来源:蓝天飞行翻译 作者:航空 点击:次
To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. The idea is to fly between 35-45 knots at about 5 feet along the "grain" of the crop (if you don't need penetration), at the end of the run pulling up and pivoting around to face the other direction on the end of the boom that is pointing into wind, so you start where you left off (the speed and height would be about 50 kts and 50 feet in forest blocks, allowing for obstacles). Thus, you turn into wind at the end of each run, progressing towards the wind direction. The trick when turning down wind is to pull up, turn halfway, then let the machine fall into the right spot, with maybe a little help from some backward cyclic. Hopefully, after each run, you can still see your load settling and can use it as an aiming point for the next one, so you could liken it to using a paintbrush, even to the extent of using pedals to twist the swath into the fiddly bits of forests. Expect to overlap about 10%. The reason for starting from a downwind position is so that you're not flying into your own spray. Before you start, however, make sure you have the right blocks, and you have the permits for them! Pesticides come in various forms, as solid, liquid or gas—in general, insecticides kill insects, herbicides kill plants (i.e. weeds) and fungicides make short work of, well, fungi, but even these classifications can be further broken down. With insecticides, a stomach poison must actually be ingested, while a contact poison needs merely to be touched by the insect. A systemic insecticide can be applied to one part of the plant from where it spreads by itself to the rest, although it may need to be applied in a particular way to be properly effective, such as at the root or on the leaves. |