By Ernest Preston Edwards
Этот определитель включает детальное описание для легкой идентификации всех мексиканских видов птиц. Описание включает английские, испанские и латинские названия, характеристику ареала, местообитаний, обилия.
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Additional info for A Field Guide to the Birds of Mexico and Adjacent Areas: Belize, Guatemala and El Salvador
Tightening the vang pulls the boom down, which tightens the leech and takes out twist. Easing the vang lets the boom rise a little, which loosens the leech and puts twist back into the sail. Similarly, trimming the mainsheet when the boom is close to the boat’s centerline—which is the case on a beat or close reach—puts a downward force on the boom, while easing the sheet lets it rise. In fact, on racing boats and performance cruisers, the mainsheet is regarded primarily as a device for controlling twist, not angle of attack.
60 percent of the way aft on this line. 54 THE BLUE BOOK OF SAILING Of course, this traditional method, while simple, is not as accurate as an in-depth calculation of the true aerodynamic CE of the two sails. In fact, the true aerodynamic CE will be a bit aft of the geometric center. Further, the geometric center fails to take into account the large headboards and roaches that characterize an increasing number of mainsails. It also fails to take into account the additional sail area in larger overlapping headsails, like genoas.
I say, give me a jib and main any day. CATCHING THE W IND 51 5 S C TH EAEPRTIENRG TW I TI LT EH YOUR SAILS And How the Keel and Rudder Lift You to Windward A M O N G M Y F O N D E S T mem- ories aﬂoat is the time my buddy Bob “Overboard” Oberbrunner and I delivered the 33-foot Tartan Ten Helldiver to Milwaukee from Sturgeon Bay, Wisconsin, after the 197-mile Hook Race. We were utterly exhausted, and Helldiver, being ﬁtted out strictly for racing, was without an autopilot. Luckily, we had great weather—moderate seas and a steady wind out of the west-southwest.