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#1
November 23rd 12, 04:45 PM
posted to rec.aviation.soaring
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Glider Wings on a 747?
On Friday, November 23, 2012 10:00:08 AM UTC+1, wrote:
Great responses Papa3 & BobW. For those wanting to quantify glide ratios, the Airbus A330-300 quotes a glide ratio of 18:1 with a double engine failure. This includes the added drag from the RAT, an emergency windmill that extends to provide hydraulic and electrical power in such a situation. Not bad for a 238,000kg machine  CaseyYeah but what is the sink rate? And at what speed? Kirk 66 
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#2
November 23rd 12, 07:21 PM
posted to rec.aviation.soaring
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Glider Wings on a 747?
At 16:45 23 November 2012, kirk.stant wrote:
On Friday, November 23, 2012 10:00:08 AM UTC+1, wrote: Great responses Papa3 & BobW. For those wanting to quantify glide ratios,= the Airbus A330-300 quotes a glide ratio of 18:1 with a double engine fail= ure. This includes the added drag from the RAT, an emergency windmill that = extends to provide hydraulic and electrical power in such a situation. Not = bad for a 238,000kg machine CaseyYeah but what is the sink rate? And at what speed? Kirk 66 Well lets do some Mathematics.... Estimated best L/D speed 160 knots Therefore vertical speed = 160 / 18 = 8.89 knots and that equals 8.89 x 6000 =53,333 ft / hr which equals 53,333 /60 = 889 ft/min. QED
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#3
November 23rd 12, 07:55 PM
posted to rec.aviation.soaring
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Glider Wings on a 747?
I would guess the best L/D speed to be in the 200-230kt range. So 1100-1300fpm.
On Friday, November 23, 2012 11:30:03 AM UTC-8, Peter Higgs wrote: At 16:45 23 November 2012, kirk.stant wrote: On Friday, November 23, 2012 10:00:08 AM UTC+1, wrote: Great responses Papa3 & BobW. For those wanting to quantify glide ratios,= the Airbus A330-300 quotes a glide ratio of 18:1 with a double engine fail= ure. This includes the added drag from the RAT, an emergency windmill that = extends to provide hydraulic and electrical power in such a situation. Not = bad for a 238,000kg machine CaseyYeah but what is the sink rate? And at what speed? Kirk 66 Well lets do some Mathematics.... Estimated best L/D speed 160 knots Therefore vertical speed = 160 / 18 = 8.89 knots and that equals 8.89 x 6000 =53,333 ft / hr which equals 53,333 /60 = 889 ft/min. QED
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#4
November 25th 12, 09:06 PM
posted to rec.aviation.soaring
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Glider Wings on a 747?
This makes them better performing than any sailplane I know of at this speed...
Ramy
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#5
November 24th 12, 06:04 AM
posted to rec.aviation.soaring
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Glider Wings on a 747?
On Friday, November 23, 2012 12:30:03 PM UTC-7, Peter Higgs wrote:
At 16:45 23 November 2012, kirk.stant wrote: On Friday, November 23, 2012 10:00:08 AM UTC+1, wrote: Great responses Papa3 & BobW. For those wanting to quantify glide ratios,= the Airbus A330-300 quotes a glide ratio of 18:1 with a double engine fail= ure. This includes the added drag from the RAT, an emergency windmill that = extends to provide hydraulic and electrical power in such a situation. Not = bad for a 238,000kg machine CaseyYeah but what is the sink rate? And at what speed? Kirk 66 Well lets do some Mathematics.... Estimated best L/D speed 160 knots Therefore vertical speed = 160 / 18 = 8.89 knots and that equals 8.89 x 6000 =53,333 ft / hr which equals 53,333 /60 = 889 ft/min. QED I believe U-2 best power out glide is 250knots. Yes quite different, but I know of two that flamed out 300 miles off the UK and returned, albeit not to homeplate.
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#6
November 25th 12, 04:45 AM
posted to rec.aviation.soaring
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Glider Wings on a 747?
At 200,000kg, 217-237kts IAS depending on altitude. Average rate of descent 1,300fpm.
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