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#21
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Ian Strachan wrote:
Our vaches may not be very vicious but our roads (for retrieving) are But didn't the ``vaches folles'' (=mad cow) start out in the UK?? SCNR ;-) -Gerhard |
#22
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In article , Eric Greenwell
writes JJ Sinclair wrote: "There is a substitute for span, it's called skill, but you can buy span" OK, it's 7:00 PM, the sky has been completely overcast for hours, you have 5000 feet and your looking at a 50 mile final glide. Now SKILL your way home. You don't grasp the concept, JJ: with skill, the pilot is 50 miles out at 6 pm, not 7 pm, and gets home just before all the lift dies. Since I can't buy skill either, I bought a motor. Even better, a motor AND good L/D. Gap-crossing can be needed any time, not necessarily after 6 PM ! -- Ian Strachan Gap Crossing Country (UK) |
#23
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Eric wrote
Since I can't buy skill either, I bought a motor. Now, Now, Eric we don't want to start that *motor* argument again, do we? JJ Sinclair |
#24
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Iam wrote.
Even better, a motor AND good L/D. Gap-crossing can be needed any time, not necessarily after 6 PM ! Now, Now, Ian we don't want to start that *motor glider* vs *pure glider* discussion again, do we? JJ Sinclair |
#25
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In article , JJ Sinclair
writes Iam wrote. Even better, a motor AND good L/D. Gap-crossing can be needed any time, not necessarily after 6 PM ! Now, Now, Ian we don't want to start that *motor glider* vs *pure glider* discussion again, do we? I meant gap crossing by L/D, not by motor, as I am sure you knew! I only use the motor to avoid landing out, and that very rarely. This year, not at all other than self-launch. -- Ian Strachan Bentworth Hall West Tel: +44 1420 564 195 Bentworth, Alton Fax: +44 1420 563 140 Hampshire GU34 5LA, ENGLAND |
#26
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JJ Sinclair wrote:
Eric wrote Since I can't buy skill either, I bought a motor. Now, Now, Eric we don't want to start that *motor* argument again, do we? JJ Sinclair That was a *contest* argument, I think! And lest someone not understand the joking going on here, it's worth noting that span, motors, and skill aren't mutually exclusive, as Klaus Ohlmann and others flying in Argentina have shown them to be a potent combination. Regardless of our individual skills, we all face the challenge of finding that "sweet spot" combination of glider attributes (performance, handling, cost, span, motor, competitiveness, etc.) that will give us the most enjoyment for our money. The glider we end up with affects the social aspects (who we fly with, when and where we fly), and the social aspects also affect the glider we choose. -- ----- change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#27
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I don't see it on their web page..
BT "Paul T" wrote in message ... Here's the figures on the American DuckHawk (got to be one of the most awful names for a sailplane) from the promo sheet. Windward Performance LLC takes its advanced technology to the racing class. Specifications Empty Weight 300 LBS Gross Weight 900 LBS Wing Span 49.17 FT Wing Area 74.93 FT^2 Aspect Ratio 32.2:1 Length 20.6 FT Horizontal Span 6.8 FT Vertical Height 4.5 FT Structural Limits +11.0 / -9.0 g's Va, Vb = 165 KTS Vne = 200 KTS Performance At 500 LBS, 6.7 Lbs/FT^2 Best Glide 50:1 at 50 KTS Min Sink 94 FPM at 40 KTS Stall Speed 35 KTS At 900 LBS, 12.0 Lbs/FT^2 Best Glide 52:1 at 67 KTS Min Sink 122 FPM at 57 KTS Stall Speed 47 KTS (data for 900 LBS, 12 PSF) Airfoils Inboard 12.7 % t/c Outboard 10.2 % t/c The DuckHawk has the broadest wing loading range available, the highest maneuvering and redline speeds, and the lowest inertias for snappy handling. The lower flying mass within the 15m span constraint gives an induced drag advantage of 49% at 500 LBS and 33% at 900 LBS (span loading squared) compared to the competition Time will tell - my money is on the Diana 2 which is a development of the SZD-56-1 Diana. (Whose cockpit is bigger than a Ventus a!). Incedently at Leszno they were also talking about an 18m version and 22m Open class version. |
#28
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The info appears to be from a handout at the Sailplane Homebuilders
Association's Western Meeting at Tehachapi, CA, in September 2003. I can't find my copy of the handout, and the website only mentions the DuckHawk (Peregrine falcon, but maybe that name was taken, or more likely, to match with the SparrowHawk now being produced). BTIZ wrote: I don't see it on their web page.. BT "Paul T" wrote in message ... Here's the figures on the American DuckHawk (got to be one of the most awful names for a sailplane) from the promo sheet. Windward Performance LLC takes its advanced technology to the racing class. Specifications Empty Weight 300 LBS Gross Weight 900 LBS Wing Span 49.17 FT Wing Area 74.93 FT^2 Aspect Ratio 32.2:1 Length 20.6 FT Horizontal Span 6.8 FT Vertical Height 4.5 FT Structural Limits +11.0 / -9.0 g's Va, Vb = 165 KTS Vne = 200 KTS Performance At 500 LBS, 6.7 Lbs/FT^2 Best Glide 50:1 at 50 KTS Min Sink 94 FPM at 40 KTS Stall Speed 35 KTS At 900 LBS, 12.0 Lbs/FT^2 Best Glide 52:1 at 67 KTS Min Sink 122 FPM at 57 KTS Stall Speed 47 KTS (data for 900 LBS, 12 PSF) Airfoils Inboard 12.7 % t/c Outboard 10.2 % t/c The DuckHawk has the broadest wing loading range available, the highest maneuvering and redline speeds, and the lowest inertias for snappy handling. The lower flying mass within the 15m span constraint gives an induced drag advantage of 49% at 500 LBS and 33% at 900 LBS (span loading squared) compared to the competition Time will tell - my money is on the Diana 2 which is a development of the SZD-56-1 Diana. (Whose cockpit is bigger than a Ventus a!). Incedently at Leszno they were also talking about an 18m version and 22m Open class version. -- ----- change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#29
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Wil Schuemann achieved 50:1 with his modified ASW-12 (wings modified
and cut down to 15 m span). Very clear clean sink rate data on a very good calm day with as little airmass movement as one could hope for. This was in the early 80's with an aircraft that was old then. |
#30
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Earlier, Greg Cole ) wrote:
...Very clear clean sink rate data on a very good calm day with as little airmass movement as one could hope for. I'd like to see that data. Is it available online? Thanks, and best regards to all Bob K. http://www.hpaircraft.com |
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