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Winch launches

Winch launches. NEXT. Winch launches. Section 1 Ab-intio brief Section 2 Launch failures Section 3 Technical. NEXT. Winch launches (section 1). Overview Objectives of launch Preparation Ground run Acceleration/take off/transition Full climb Release Cross wind. NEXT.

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Winch launches

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  1. Winch launches NEXT DON PUTTOCK

  2. Winch launches • Section 1 Ab-intio brief • Section 2 Launch failures • Section 3 Technical NEXT DON PUTTOCK

  3. Winch launches (section 1) • Overview • Objectives of launch • Preparation • Ground run • Acceleration/take off/transition • Full climb • Release • Cross wind NEXT DON PUTTOCK

  4. Winch launches (section 1)(overview) Winches can vary considerably from site to site. You will need to be able to cope with the differences in power and drive systems. NEXT DON PUTTOCK

  5. Winch launches (section 1)(overview) • Ground run Climb Release • Acceleration • Transition NEXT DON PUTTOCK

  6. Winch launches (section 1)(objectives) • Attain a 45° climb angle while being able to recover safely from any position within the launch profile. • Maintain a safe speed throughout. • Not put the glider, yourself or anyone else at risk from the launch or the cable. • Achieve maximum height without compromising operations or safety. NEXT NEXT NEXT NEXT DON PUTTOCK

  7. Winch launches (section 1)(objectives) SAFETY is the concern of everybody, but:- • As the captain of the aircraft, you are in charge. • If it goes wrong its your fault. • If in doubt don’t launch NEXT DON PUTTOCK

  8. Winch launches (section 1)(preparation) Do not use soft (compressible ) cushions. During the acceleration phase you may move back and inadvertently bring the stick with you !! NEXT DON PUTTOCK

  9. Winch launches (section 1)(preparation) What is Vw (the maximum launch speed). Remember that it is reasonable to exceed this speed during the first half of the launch. So don’t panic. NEXT DON PUTTOCK

  10. Winch launches (section 1)(preparation) Before take off. • Know where the Airspeed indicator is located. • You may find yourself trying to figure out your speed using the wrong instrument!! ? NEXT DON PUTTOCK

  11. Winch launches (section 1)(preparation) Is your winch hook offset? • Offset hooks can cause the glider to turn at “all out”, so be prepared. NEXT DON PUTTOCK

  12. Winch launches (section 1)(preparation) • Know where the Release knob is and put your hand on it. • If you need it, you wont have time to go hunting. • In this aircraft it is also possible to block access with the stick!! NEXT DON PUTTOCK

  13. Winch launches (section 1)(preparation) The trim setting is important. Trim lever The trim is set for landing. NEXT DON PUTTOCK

  14. Winch launches (section 1)(preparation) Think about eventualities. What is your approach speed today? If you cant land ahead, which way will you turn? • These are the very last things you consider before connecting the cable. NEXT DON PUTTOCK

  15. Winch launches (section 1)(preparation) • Is the correct weak link being used, is it the correct hook? • Remember you need to check, people can and do make mistakes.. NEXT DON PUTTOCK

  16. Winch launches (section 1)(preparation) Is the cable laid out straight in front of you? The glider will initially follow the line of the cable. If its not straight the glider will swing, and that might be dangerous. NEXT DON PUTTOCK

  17. Winch launches (section 1)(preparation) If you are ready to go. Checks complete. Issue the instruction to attach the cable. • You have now authorised the launch crew to proceed. NEXT DON PUTTOCK

  18. Winch launches (section 1)(ground run) Waiting for “take up slack” • Relax. • Keep a good lookout • Hand on release • Hold stick firmly but lightly • Rudder central NEXT DON PUTTOCK

  19. Winch launches (section 1)(ground run) “All-out” • Keep the wings level with aileron. • Steer with the rudder. • Balance glider on its main wheel. The controls will go from ineffective to very effective as you accelerate. NEXT DON PUTTOCK

  20. Winch launches (section 1)(ground run) If a wing goes down or touches the ground despite the application of aileron. PULL THE RELEASE NEXT DON PUTTOCK

  21. Winch launches (section 1)(ground run) Keep the glider balanced on its main wheel When the airspeed is there, it will lift off DON PUTTOCK

  22. Winch launches (section 1)(transition) Keeping the stick neutral, monitor the rotation into the climb Speed good and increasing DON PUTTOCK

  23. Winch launches (section 1)(transition) Keeping the stick neutral, monitor the rotation into the climb Speed good and increasing DON PUTTOCK

  24. Winch launches (section 1)(transition) Keeping the stick neutral, monitor the rotation into the climb Speed good and increasing DON PUTTOCK

  25. Winch launches (section 1)(transition) Keeping the stick neutral, monitor the rotation into the climb The speed is increasing because the aircraft is smoothly rotating into the climb If the speed starts to decay in the transition phase, abort the launch At every stage the glider is climbing but its attitude is never too steep to recover safely. NEXT DON PUTTOCK

  26. Winch launches (section 1)(transition) Slide courtesy of the BGA Drawing by Steve Longland Full Climb Transition phase Acceleration phase NEXT DON PUTTOCK

  27. Winch launches (section 1)(transition) Rapid rotation means you will be too steep too early, the chance of recovery in a launch failure is remote. If the launch fails, the deceleration will be about 8 knots per second!! NEXT DON PUTTOCK

  28. Winch launches (section 1)(transition) Chord The angle of attack is also dangerously high. Angle of attack LIFT Flight path This is because the wing is doing more work. Cable pull Drag Weight NEXT DON PUTTOCK

  29. Winch launches (section 1)(transition) Swift rotation = high lift load = high AofA Slower rotation = Lower lift load = Lower AofA Darker shading represents A of A Slide courtesy of the BGA Drawing by Steve Longland NEXT DON PUTTOCK

  30. Winch launches (section 1)(The full climb) • Too steep: • Better climb • Risk breaking weak link • More difficult to recover NEXT DON PUTTOCK

  31. Winch launches (section 1)(The full climb) • Too shallow: • Poor rate of climb • Risk overspeeding • Launch failures start lower and further into the field. NEXT DON PUTTOCK

  32. Winch launches (section 1)(The full climb) • About 45°: • Optimum climb • Safest recovery. How do you know you are climbing at 45° ? NEXT DON PUTTOCK

  33. Winch launches (section 1)(The full climb) • During the launch we need to know: • Our airspeed. • Our angle of climb. Airspeed trends are seen on the airspeed indicator Our climb angle is seen, by assessing the angle with the horizon. NEXT DON PUTTOCK

  34. Winch launches (section 1)(The full climb) • During the launch we need to know: • Our airspeed. • Our angle of climb. So we must continually scan between the wingtips and the ASI NEXT DON PUTTOCK

  35. Winch launches (section 1)(The full climb) ASI ASI ASI CLIMB ANGLE CLIMB ANGLE CLIMB ANGLE SCAN NEXT DON PUTTOCK

  36. Winch launches (section 1)(The full climb) Keep straight by:- Keeping both wings equidistant above the horizon. Pointing at a cloud straight ahead Keeping the same amount of ground on either side of the nose. NEXT DON PUTTOCK

  37. Winch launches (section 1)(The full climb) If the speed starts to decay: Progressively lower the nose until the speed returns. If the speed does not return by level flight, pull the release and abort. If the speed returns, cautiously return to the climb. Only accept one reduction in speed. NEXT DON PUTTOCK

  38. Winch launches (section 1)(The full climb) If the speed starts to increase: Check your climb angle is correct. Signal “too fast”. If the speed exceeds Vw on the 2nd half of the launch, pull the release. NEXT DON PUTTOCK

  39. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal DON PUTTOCK

  40. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal DON PUTTOCK

  41. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal DON PUTTOCK

  42. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal DON PUTTOCK

  43. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal DON PUTTOCK

  44. Winch launches (section 1)( Too Fast ) If the speed starts to increase: Give the too fast signal NEXT DON PUTTOCK

  45. Winch launches (section 1)(hunting) DON PUTTOCK

  46. Winch launches (section 1)(hunting) DON PUTTOCK

  47. Winch launches (section 1)(hunting) DON PUTTOCK

  48. Winch launches (section 1)(hunting) DON PUTTOCK

  49. Winch launches (section 1)(hunting) DON PUTTOCK

  50. Winch launches (section 1)(hunting) DON PUTTOCK

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