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  #21  
Old 04-28-2009, 05:32 PM
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But wait! There's more! Also included in the kit is a model of a Czajka-bis (chaika (seagull)) primary glider in the markings of the LOPP. That's in under the RWD.
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  #22  
Old 04-28-2009, 05:46 PM
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I was wondering if there was something like that when you posted "end of part one".
Chris
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  #23  
Old 04-28-2009, 09:47 PM
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A czajka is actually a lapwing, as far as I know.
http://republika.pl/blog_sw_4220248/...l_czajka_2.jpg

Looking really nice though, I love the landing gear.
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  #24  
Old 04-29-2009, 05:06 AM
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Great photo of a pretty bird, Kuba!

Mark -- Was the RWD meant to be the tow-plane for the glider?

Don
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Old 04-29-2009, 07:04 AM
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No, I think it's just supposed to be examples of 30's civil aviation.

Aerotowing a primary glider can be done, but is uncomfortable for all involved. The top speed of the glider - even with a pod fuselage- is so slow that the tow plane is near stall while the glider is screaming along at the top of the rope.

Primary gliders are usually bungee launched (gigantic bit of knicker elastic), ideally over a slope that falls away just a little more steeply than the glide ratio of the airplane.
Then all the cadets rush down the hill and drag the plane back to the top to do it over again.
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Old 04-29-2009, 07:05 AM
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Thanks for that info, Mark.

Don
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  #27  
Old 04-29-2009, 07:45 PM
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Kuba what a great bird! Shrike I think you have made a nice model of an aircraft completely foreign to me. (Vintage European birds are not something I have had the opportunity to study, unlike plovers) Daring to make it with stock paper, especially forming the delicate appearing cowling, but who's idea where those wings? Same school of thought as the Lysander?:D
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Last edited by birder; 04-29-2009 at 07:47 PM. Reason: same old same old
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  #28  
Old 04-29-2009, 10:15 PM
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Lysander, Stinson Reliant, PWS-10, any of the Pulaski winged PZL's, the list could go on. The tapered section of the wing has concentrations of lift were the stuts attach (or vise versa if your prefer), with reduced drag and weight of structure in the rest of the wing.

Just like eliptical wings -Spitfire, He112 et c. designers of the day were striving for the last little bit of aerodynamic efficiency as it was understood. Varying the thickness and planform of the wing in such away does bring about greater efficiency, but at the cost of greater complexity.

An elliptical wing is only slightly better than a simple double taper, but not enough to justify the complex forming of skins or the fact that no more than any two ribs are same throughout. The Spitfire is the only mass produced airplane i can think of that actually retained the elliptical planform past the prototype. (Although elliptical wings tips are common yielding many of the benefits at an acceptable cost)

A tapered section wing is more efficient than a straight one, but not enough to justify all the extra work. Certainly not at speeds under 200kts.
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Old 04-29-2009, 11:18 PM
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How about Heinkel's designs? - the He 111 has an approximation of an elliptical planform.

Regards,

Charlie
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  #30  
Old 04-29-2009, 11:46 PM
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Approximation, but after the initial true elliptical winged prototype, they changed to a multiple tapered wing for ease of manufacture.

I suppose we could add the He70/170, but I'm not sur if that could really be called 'mass-produced'
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