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#71
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Winch Launch Safety Study
At 19:00 28 March 2009, David Chapman wrote:
A Yahoo groups forum on Glider Winch engineering. Some posts review tension control, ?? ....... http://dir.groups.yahoo.com/group/wi...eer/message/36 http://dir.groups.yahoo.com/group/wi...eer/message/38 and even one thinking about using battery power? http://dir.groups.yahoo.com/group/wi...eer/message/40 Did anyone get a electric battery launch before? There is a German made electric winch called the ESW2B that essentially runs on battery power, albeit an array of 12 volt lead-acid ones. They need to be constantly charged up while in use, either from the mains or a portable generator. I believe that you can't do too many launches per hour without boiling the battery acid. A winch needs at least 300hp or 230kW to launch a modern two-seater glider, so it's a bit too much for normal mains electricity! Derek Copeland |
#72
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Winch Launch Safety Study
On 22 Mrz., 03:24, bildan wrote:
And just as often I've challenged you to produce ANY engineering data to support your mere opinion. *You have not and I believe you cannot. That seems like elementary rigid body mechanics to me. In this case calculations trump measurements due to the well-understood nature of the physics and the inherent errors of any measurement. A simple longitudinal simulation model should be well sufficient to gain good insight into these types of accidents. Would be an interesting subject for a followup article. Best regards --Gerhard Wesp |
#73
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Winch Launch Safety Study
On 26 Mrz., 02:55, wrote:
What the initial tension, measured in G that you consider ideal on initial launch? Are you afraid to answer this question that I am now asking of you for the third time already? You can't complain about others not providing data (which is not true) if you refuse to even begin to do so yourself. So put up already. Ahem... Tension is measured in Newton, not in G. G == acceleration, or m/s^2. Yes, the forward acceleration of the glider in the initial takeoff run can be measured in G, but the connection between the cable tension and acceleration involves glider and cable mass and wind, so there's no one-to-one correspondence. Best regards --Gerhard Wesp |
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