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#1
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50+:1 15m sailplanes
'DuckHawk 15m racer announced at 2003 SHA Western Workshop.
53:1glide ratio VNE 200 kts' -from Winward Performance - anyone got anymore details? 'SZD-56-2, Diana 2: Newest 15-meter Sailplane.The technologically advanced SZD-56-2 Diana 2 will soar on new wings next summer. Bogumil Beres, chief design engineer of the Diana and owner of Biuro Projektowe 'B' Bogumil Beres, recently announced the design project of a breakthrough Diana 2, featuring a curved wing platform with a continuously varying airfoil and high-performance winglets. The original Diana fuselage will be retained, but with a lower drag fuselage-wing junction. The wing loading range will be 6.08 - 11.7 psf. Most remarkably, the Diana 2 will break the long-standing 15-meter glide ratio barrier of 50/1 with room to spa forecast performance includes a max L/D of 52/1. The prototype Diana 2 wings will fly next August. Diana 2's will be delivered in the Spring of 2005.' Have the Germans got something to worry about? |
#2
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Announcements are cheap...
-- Bert Willing ASW20 "TW" "Paul T" a écrit dans le message de ... 'DuckHawk 15m racer announced at 2003 SHA Western Workshop. 53:1glide ratio VNE 200 kts' -from Winward Performance - anyone got anymore details? 'SZD-56-2, Diana 2: Newest 15-meter Sailplane.The technologically advanced SZD-56-2 Diana 2 will soar on new wings next summer. Bogumil Beres, chief design engineer of the Diana and owner of Biuro Projektowe 'B' Bogumil Beres, recently announced the design project of a breakthrough Diana 2, featuring a curved wing platform with a continuously varying airfoil and high-performance winglets. The original Diana fuselage will be retained, but with a lower drag fuselage-wing junction. The wing loading range will be 6.08 - 11.7 psf. Most remarkably, the Diana 2 will break the long-standing 15-meter glide ratio barrier of 50/1 with room to spa forecast performance includes a max L/D of 52/1. The prototype Diana 2 wings will fly next August. Diana 2's will be delivered in the Spring of 2005.' Have the Germans got something to worry about? |
#3
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Well... I have heard exactly the same, and the designer is certainly a ki
nd of person who I can trust. In my personal opinion the price won't wary a lot from the price of the Diana I, but finally, drop an email into desi gner's mailbox, and maybe You'll know something more. The website is www.beres.com.pl Regards, -- Janusz Kesik visit www.leszno.pl - home of the www.css-leszno.it.pl |
#4
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I own an honest to god, 53:1, 15 meter ship. I'm not kidding, on several
occasions the GPS trace shows I am making 100 foot per statute mile. The only problem is, when I measure the wings, the tape reads 86 feet (ASH-25) JJ Sinclair |
#5
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Wax build up!
At 15:48 22 December 2003, Jj Sinclair wrote: I own an honest to god, 53:1, 15 meter ship. I'm not kidding, on several occasions the GPS trace shows I am making 100 foot per statute mile. The only problem is, when I measure the wings, the tape reads 86 feet (ASH-25) JJ Sinclair |
#6
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Wax build up!
At 15:48 22 December 2003, Jj Sinclair wrote: I own an honest to god, 53:1, 15 meter ship. I'm not kidding, on several occasions the GPS trace shows I am making 100 foot per statute mile. The only problem is, when I measure the wings, the tape reads 86 feet (ASH-25) JJ Sinclair |
#7
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It's been a few years, but if memory serves Gerhard said that the 27
wing could manage a Finesse (best L/D) of 100, that is, if he didn't have to hang a fuselage off of it. However, most glider pilots like to fly their aircraft in the first person, so he compromised and got a Finesse around 46. The Diana, on the other hand, took the road less travelled by and decided that pilot comfort (or in my case, presence) were not critical marketing factors. Based on that philosophy, I wouldn't doubt that a determined engineer could achieve a Finesse of 50+ for a 15 meter glider. However, we've learned that best L/D is a poor means of judging sailplane performance. It is the flatness of the drag curves on both sides of the intersection that really determine the worth of your glider. A polar free of a low speed bucket and relatively flat increase of sink with speed make a great glider. Might the poles have found a new trick? A more stable high aspect ratio airfoil that needs less tail? A better fuselage/wing transition? Improved laminar control? Perhaps. Paul T wrote in message ... 'DuckHawk 15m racer announced at 2003 SHA Western Workshop. 53:1glide ratio VNE 200 kts' -from Winward Performance - anyone got anymore details? 'SZD-56-2, Diana 2: Newest 15-meter Sailplane.The technologically advanced SZD-56-2 Diana 2 will soar on new wings next summer. Bogumil Beres, chief design engineer of the Diana and owner of Biuro Projektowe 'B' Bogumil Beres, recently announced the design project of a breakthrough Diana 2, featuring a curved wing platform with a continuously varying airfoil and high-performance winglets. The original Diana fuselage will be retained, but with a lower drag fuselage-wing junction. The wing loading range will be 6.08 - 11.7 psf. Most remarkably, the Diana 2 will break the long-standing 15-meter glide ratio barrier of 50/1 with room to spa forecast performance includes a max L/D of 52/1. The prototype Diana 2 wings will fly next August. Diana 2's will be delivered in the Spring of 2005.' Have the Germans got something to worry about? |
#8
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There were 2 SZD56 flying in the worlds in Sweden in 1993. They
performed nice but not astonishing. One of them even had a minor midair. A year later or so we had one (modified) exhibited at the Annual Swedish Cliding Conference, and as Chris writes, the cockpit were not built for nice looking guys from the West, but supposedly for thin, starving pilots from the eastblock...... (now that has thank God changed!) Moffat once wrote: there is no substitute for span! If you want 50+ go for an 18m or larger ship, if you want nice handling, easy rigging etc, it is easy to trade in som finesse-point to achieve that in a 15m glider! Robert H304 Chris OCallaghan wrote: It's been a few years, but if memory serves Gerhard said that the 27 wing could manage a Finesse (best L/D) of 100, that is, if he didn't have to hang a fuselage off of it. However, most glider pilots like to fly their aircraft in the first person, so he compromised and got a Finesse around 46. The Diana, on the other hand, took the road less travelled by and decided that pilot comfort (or in my case, presence) were not critical marketing factors. Based on that philosophy, I wouldn't doubt that a determined engineer could achieve a Finesse of 50+ for a 15 meter glider. However, we've learned that best L/D is a poor means of judging sailplane performance. It is the flatness of the drag curves on both sides of the intersection that really determine the worth of your glider. A polar free of a low speed bucket and relatively flat increase of sink with speed make a great glider. Might the poles have found a new trick? A more stable high aspect ratio airfoil that needs less tail? A better fuselage/wing transition? Improved laminar control? Perhaps. Paul T wrote in message ... 'DuckHawk 15m racer announced at 2003 SHA Western Workshop. 53:1glide ratio VNE 200 kts' -from Winward Performance - anyone got anymore details? 'SZD-56-2, Diana 2: Newest 15-meter Sailplane.The technologically advanced SZD-56-2 Diana 2 will soar on new wings next summer. Bogumil Beres, chief design engineer of the Diana and owner of Biuro Projektowe 'B' Bogumil Beres, recently announced the design project of a breakthrough Diana 2, featuring a curved wing platform with a continuously varying airfoil and high-performance winglets. The original Diana fuselage will be retained, but with a lower drag fuselage-wing junction. The wing loading range will be 6.08 - 11.7 psf. Most remarkably, the Diana 2 will break the long-standing 15-meter glide ratio barrier of 50/1 with room to spa forecast performance includes a max L/D of 52/1. The prototype Diana 2 wings will fly next August. Diana 2's will be delivered in the Spring of 2005.' Have the Germans got something to worry about? |
#9
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Just to keep stuff straight, while Mr. Moffat has certainly expessed
from time to time his fondness for span, I believe "there is no substitute for span" quote comes from Michael Bird ("Platypus") who used to "tinsfos" us quite regularly in S & G (Brit mag) from across the pond .... Of course I could be wrong .. BJ Robert Danewid wrote: There were 2 SZD56 flying in the worlds in Sweden in 1993. They performed nice but not astonishing. One of them even had a minor midair. A year later or so we had one (modified) exhibited at the Annual Swedish Cliding Conference, and as Chris writes, the cockpit were not built for nice looking guys from the West, but supposedly for thin, starving pilots from the eastblock...... (now that has thank God changed!) Moffat once wrote: there is no substitute for span! If you want 50+ go for an 18m or larger ship, if you want nice handling, easy rigging etc, it is easy to trade in som finesse-point to achieve that in a 15m glider! Robert H304 Chris OCallaghan wrote: It's been a few years, but if memory serves Gerhard said that the 27 wing could manage a Finesse (best L/D) of 100, that is, if he didn't have to hang a fuselage off of it. However, most glider pilots like to fly their aircraft in the first person, so he compromised and got a Finesse around 46. The Diana, on the other hand, took the road less travelled by and decided that pilot comfort (or in my case, presence) were not critical marketing factors. Based on that philosophy, I wouldn't doubt that a determined engineer could achieve a Finesse of 50+ for a 15 meter glider. However, we've learned that best L/D is a poor means of judging sailplane performance. It is the flatness of the drag curves on both sides of the intersection that really determine the worth of your glider. A polar free of a low speed bucket and relatively flat increase of sink with speed make a great glider. Might the poles have found a new trick? A more stable high aspect ratio airfoil that needs less tail? A better fuselage/wing transition? Improved laminar control? Perhaps. Paul T wrote in message ... 'DuckHawk 15m racer announced at 2003 SHA Western Workshop. 53:1glide ratio VNE 200 kts' -from Winward Performance - anyone got anymore details? 'SZD-56-2, Diana 2: Newest 15-meter Sailplane.The technologically advanced SZD-56-2 Diana 2 will soar on new wings next summer. Bogumil Beres, chief design engineer of the Diana and owner of Biuro Projektowe 'B' Bogumil Beres, recently announced the design project of a breakthrough Diana 2, featuring a curved wing platform with a continuously varying airfoil and high-performance winglets. The original Diana fuselage will be retained, but with a lower drag fuselage-wing junction. The wing loading range will be 6.08 - 11.7 psf. Most remarkably, the Diana 2 will break the long-standing 15-meter glide ratio barrier of 50/1 with room to spa forecast performance includes a max L/D of 52/1. The prototype Diana 2 wings will fly next August. Diana 2's will be delivered in the Spring of 2005.' Have the Germans got something to worry about? |
#10
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In article , Bob Johnson
writes Just to keep stuff straight, while Mr. Moffat has certainly expessed from time to time his fondness for span, I believe "there is no substitute for span" quote comes from Michael Bird ("Platypus") I do not think that Plat would claim credit for this saying which, regarding straight performance, has been extant in gliding since I started in the 1950s. It refers to the "easiest way to increase performance" (max L/D I suppose), contrasting the relative simplicity of adding span compared to the complexities of adding flaps, new airfoil sections, new configurations, etc. In my own case I remember the Grunau (about 13m I think), good in a thermal but not in a glide, a sort of ancient PW-5. After the Grunau, I progressed through the 15m Meise (well the UK Olympia version anyway) to the Skylark 2 (laminar 15m) to the Skylark 3 & 4 (18m) and finally through various syndicates from 15 to 18m to the Nimbus series, starting at 22m and now 26 in the Nimbus 4DM, twice the span of the dear old Grunau. As far as I am concerned, "there is no substitute for span". In UK soaring conditions, anyway, if you wish to avoid landing "aux vaches". Our vaches may not be very vicious but our roads (for retrieving) are ........ -- Ian Strachan Lasham Gliding Centre UK South |
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