GLIDER WINCH LAUNCHING FUN FOR LESS Chapter 1 The Big Picture

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GLIDERWINCH LAUNCHING FUN FOR LESS! Chapter 1
The Big Picture
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Sources

• Glider Flying Handbook FAA-H-8083-13 2003
• American Soaring Handbook, Ch 3,Soaring Society
  of America, 1967, 1980
• Private/Commercial Soaring Flight Manual
  Jeppesen/Sanderson 1996
• Private Pilot Glider Practical Test Standards,
  FAA-S-8081-22 4/1/99

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Subject Areas Covered

• Preflight Items
• Pre - Launch and Inflight Launch Signals
• Normal Launch
• Crosswind Takeoff and Climb
• Tow Speeds
• Climb and Release Procedures
• Safety
• Abnormal and Emergency Procedures

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The Big Picture

• Even though this program will result in a winch
  launch endorsement, it is Schweizer 2-33
  specific. All limits speeds are those of the
  2-33

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The Big Picture

• Even though this program will result in a winch
  launch endorsement, it is Schweizer 2-33
  specific. All limits speeds are those of the
  2-33
• If flying another glider on a winch launch, get
  additional type-specific training!

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The Big Picture
The airspeed gauge must be watched closely
throughout the takeoff
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The Big Picture
The airspeed gauge must be watched closely
throughout the takeoff
The glider becomes airborne VERY quickly. Be
switched on
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The Big Picture
The airspeed gauge must be watched closely
throughout the takeoff
Once a Safety Speed of 40mph is reached, rotate
in approx. 4 seconds to reach 45 degrees pitch up
by 200 feet
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The Big Picture
The airspeed gauge must be watched closely
throughout the takeoff
Above 200 feet the Schweizer 2-33 will require
full back stick, due to the nose hook and limited
elevator. Hold bank into the wind if there is a
crosswind. Signal winch operator if too slow or
too fast
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The Big Picture
The airspeed gauge must be watched closely
throughout the takeoff
When the cable is 70 degrees above the horizon
the winch operator goes to idle and the glider
releases soon after
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Towhooks
If a CG hook is used for ground launch it is
easier for the pilot to rotate the glider to
different pitch attitudes
C.G. Towhook
Figure 7-16
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Towhooks
If a nose towhook is used for ground launch, as
in the SGS 2-33, the downward pull of the towline
on the gliders nose limits both the- climb
angle, and the- release altitude
Nose Towhook
Figure 7-16
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Towhooks
The elevator control forces and structural
loading on the gliders tail are also somewhat
greater (but still within limits)
Nose Towhook
Figure 7-16
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The Big Picture

• Normally, to control airspeed on a winch launch,
  once above 200 feet, (especially with a CG hook)
  the pitch works backwards.

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The Big Picture

• Normally, to control airspeed on a winch launch,
  once above 200 feet, (especially with a CG hook)
  the pitch works backwards.
• Pulling back will increase speed, and pushing
  forward decrease speed. Why this is will be
  shown later

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The Big Picture

• The previous statement is not true for the SGS
  2-33 due to the nose towhook and the limited
  elevator.

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The Big Picture

• Once safety speed (40 mph) is reached and
  exceeded , and when above 200, the pilot should
  get the stick full back, then watch the airspeed
  closely. Signal the winch operator if there is a
  need to speed up or slow down (Signals covered
  later)

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Schweizer 2-33 G Load
80 mph
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Schweizer 2-33 G Load
Winch launching is well within the 2-33 G Load
range of 4.67 Gs and -2.56 Gs.
80 mph
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Schweizer 2-33 G Load
Winching speeds are low, performed between stall
speed and max winching speed of 69 mph
80 mph
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Schweizer 2-33 G Load
The weak link in the towrope line can only
sustain a maximum of 2 Gs before it breaks, just
like aerotow ropes
80 mph
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Schweizer 2-33 G Load
Normal winch launch puts approximately 1 to 1.75
Gs on the glider
80 mph
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Questions

• What is the best kind of towhook for winch
  towing?

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Questions

• What is the best kind of towhook for winch
  towing?
• The CG hook

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Questions

• What are the 2 disadvantages of using a nose
  towhook instead of a CG towhook?

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Questions

• What are the 2 disadvantages of using a nose
  towhook instead of a CG towhook?
• 1. The downward pull of the towline on the nose
  of the glider limits both climb angle and
  altitude gained, and

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Questions

• What are the 2 disadvantages of using a nose
  towhook instead of a CG towhook?
• 1. The downward pull of the towline on the nose
  of the glider limits both climb angle and
  altitude gained, and
• 2. The elevator control forces and structural
  loading on the glider tail are somewhat greater
  (but within limits)

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Questions

• What is the G rating of the SGS 2-33?

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Questions

• What is the G rating of the SGS 2-33?
• 4.67 Gs

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Questions

• What is the maximum G Load that can be put on the
  glider before the weak link will break?

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Questions

• What is the maximum G Load that can be put on the
  glider before the weak link will break?
• 2.0 Gs

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Questions

• What is the G Load during normal launch?

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Questions

• What is the G Load during normal launch?
• Approximately 1.75 Gs