Page
183
2.6 Specifications
2.6.1 Tow Lines and Safety Links.
Towlines and Bridle are made of Spectra 1000 or Dyneema (
UHMwPE). 1100# to 2200# due to the
dragging of the line during landing and taxi we use a more durable line. The small diameter and light
weight of the towline, allows it to maintain alignment with less effect from wind & gravity forces.
There is almost zero plasticity allowing all forces to get to the Safety Links rapidly.
CAUTION:
Never use twisted construction lines or rope. Always use Braided construction lines as
specified in Dragonfly Manuals.
NOTE:
Because of the durable size of the line, it is important to insure Safety Links are properly
installed. Refer to FIGURE 2 for proper tying and configuration
The Single Loop is used to fasten the Towline to the Glider being towed. (Point E in Figure 1)
Solo Glider
TUF LINE BRAIDED DACRON 130 LB. TEST
GREEN SPOT,
or
Tandem Glider
TUF LINE BRAIDED DACRON 200 LB. TEST
GREEN SPOT,
(200 lb. on
Single Loop only)
which can be purchased on the Internet.
The Triple Strength Link is used to fasten the Tow Bridle to the Quick Release. (Point B in Figure 1)
We use
TUF LINE BRAIDED DACRON 130 LB. TEST
GREEN SPOT,
2.7 Period of Operations of Release, TBO and Inspection Intervals.
Normally at engine change or rebuild, approximately 2000 hours or 6,000 tows, a complete and
thorough inspection of the release should be performed. There is no specific TBO. However, every
Annual or 100 Hour Inspection requires a thorough inspection to insure there are no problems with
wear or operation of the Release and all components in the Tow Release and System.
There are Releases in operation that are more the 20 years old and are still in good working
condition. Some older units had a zinc plated steel spring that eventually corrodes. But the newer
Stainless Steel Spring has shown no signs of problems. We have never experienced a broken spring in
20+ years, but it must be inspected every Annual or 100 Hour Inspection.
3. Checklists
3.1 Pre-Flight (second person needed)
1) Visually inspect all components and lines.
2) Inspect Release Mechanism
3) Without pressure on Bridle, insure Release Locking Arm on Release Assembly and Handle
return to Normal Positions.
4) With pull being applied to bridle, test that line releases properly and with smooth motion of
the release handle.
5) Insure that Safety Links are proper size, material and installed properly. Links are in good
condition. Both the Bridle Safety Link and Safety Links to be used on the glider end.
3.2 Pre-Tow
1) Insure that Pilots, Ground Crew and Helpers have the proper Ratings, Authorizations,
Waivers and Experience necessary to conduct Safe Operations.
2) Insure that all Ground and in-flight signals and communications between Tow Plane Pilot,
Glider Pilot and Ground Crew are agreed upon and everyone involved knows these signals and there
will be no confusion during operations.
3) Insure that Ground Crew and Bystanders are aware of the Safety Practices and Safe Zones
during Tow Operations.
Summary of Contents for 912 Dragonfly
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Page 79: ...Page 78 Wiring1 jpg Drawing 28a ...
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Page 81: ...Page 80 elecLights jpg Drawing 28c ...
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Page 92: ...Page 91 Appendix B Brakes Manual for BX1320 BX1000 Appendix B Page 1 ...
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Page 104: ...Page 103 Figure 1a Description of Display Pages ...
Page 105: ...Page 104 Figure 1b Description of Display Pages ...
Page 138: ...Page 137 Appendix C EIS 4000 912 914 ...
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Page 140: ...Page 139 Appendix C EIS 4000 912 914 ...
Page 141: ...Page 140 Appendix C EIS 4000 912 914 End Appendix C ...
Page 155: ...Page 154 Appendix E2 Powerfin Prop Page 2 ...
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Page 164: ...Page 163 Appendix E2 Powerfin Prop Page 11 End of Appendix E2 ...
Page 187: ...Page 186 By Memphis Soaring FIGURE 3 Common Signals ...