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To add to Bill's explanation, control rods through
belcranks is the simplest. Some older gliders used cables and pulleys. Some early glass gliders used complex gearboxes to convert linear into rotary movement and modern gliders with flaperons have mixer arrangements. All have one thing in common they are directly mechanical. In most modern gliders the stick forces are very light, frightening so in something like a Discus. Some of the older gliders did get heavy at speed, for instance at 80kts the ailerons on a Sedbergh (Slingsby T21) are set in concrete requiring two hands or even four if available, not to mention the foot behind the stick to relieve the need for forward pressure on the stick. DJ At 15:30 25 February 2005, Bill Daniels wrote: wrote in message roups.com... I note that some gliders are controlle with a joystick which makes me curious as to how the control surfaces are powered. Assuming these are useable by people who lack the forearms of a truck driver, how are they powered? Do these systems use electric servos with a battery recharged on the ground? Do they use vaccumm assist from a venturi? Just asking? -- FF You really need to visit the nearest gliderport and take a ride. Assuming you are in the USA, check www.ssa.org and click the button 'Where to fly' to find the nearest location. One of the great beauties of gliders is their simplicity. Usually, the only 'power' in the glider is a small battery to power the radio and a few instruments. Everything else is powered by the pilot. The control forces in modern gliders are small enough that pilots can fly with their finger tips most of the time. If you see a glider pilot with 'truck driver forearms', it's from assembling the glider, not flying it. Bill Daniels |
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