Very low aspect ratio planes?

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henryk

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nikolai

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L/D= Cl/Cd=Cy/Cx =AK...(finesse)
L/D is short for the Lift to Drag ratio.
Thanks for the clarification.
I did not find any calculated or obtained data as a result of flight tests. It is known that the optimal take-off angle was about 15 degrees. At lower angles, the plane did not gain altitude. Also, the gliding speed was quite high 12-13 m / s. Consequently, the aerodynamic quality was rather poor.
There is very little information about Moskalev's aircraft. In addition, the Strela itself was destroyed after testing. Allegedly, the military leadership has lost interest in such aircraft. More like an order to "lose interest"
 

nikolai

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Okay. Now we are looking at exactly the aspect ratio of the wing. Let's take the diameter of the wing as its span. We get 5x5: 20 = 1.25 SAM-9 leading)
 

henryk

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We get 5x5: 20 = 1.25
Anatoliy писал=

"
Второй аналог.
Планер "Дископлан-1" Имеет аэр. кач. равное 7. Опять шасси не убираемое и фюзеляж не очень хорош с точки зрения обтекания (маленькое удлинение и недостаточно плавные обводы).
Третий аналог.
Планер "Дископлан-2". Не могу найти официального сообщения о его аэр. качестве. Но в юнности, когда о нем появились сообщения писали помню точно значение равное 10. У этого планера крыло имеет не очень удачный профиль (острая передняя кромка) "

=DISCOPLAN-2, L/D=10 ! (probably)...
 

nikolai

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Anatoliy писал=

"
Второй аналог.
Планер "Дископлан-1" Имеет аэр. кач. равное 7. Опять шасси не убираемое и фюзеляж не очень хорош с точки зрения обтекания (маленькое удлинение и недостаточно плавные обводы).
Третий аналог.
Планер "Дископлан-2". Не могу найти официального сообщения о его аэр. качестве. Но в юнности, когда о нем появились сообщения писали помню точно значение равное 10. У этого планера крыло имеет не очень удачный профиль (острая передняя кромка) "

=DISCOPLAN-2, L/D=10 ! (probably)...
We're discussing the smallest wing aspect ratio, right? Not aerodynamic. I am not a specialist in aerodynamics, I am just an aviation enthusiast. )
 

henryk

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=UFO (Useless Flying Objrct)

"
Very low aspect ratio planes
"
 

BJC

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The only Bumble Bee picture I could find. Judging by it, the aspect ratio of the wing is about 2 or more.
AR is not relevant to performance, span is. That Bumble Bee flew, but it couldn’t have been fun to fly.


BJC
 

Urquiola

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As I don't remeber if I added the document: 'Characteristics of Clark Y airfoils of small aspect ratios', NACA report 431. C H Zimmermann. I attach it now. The interesting info is an AR of 1 gives impressive better results compared to an AR of 2 or 3. Blessings +
 

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Urquiola

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=UFO (Useless Flying Objrct)

"
Very low aspect ratio planes
"
Dynafan is a 'Coanda effect' machine, lots of it appear in YouTube. Valeriu Dragan, at Bucharest University, published some engineering research about the Coanda concepts. Blessings +
 
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cluttonfred

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Neat stuff, delta, I like the faceted disk wing a lot more than the multiplane version. Personally, I am still drawn to the Piana-Canova rhomboidal planform which seems like the easiest to build, especially the PC.140 with Junkers-style control surfaces. I wonder if simple flat control surfaces would work for this application?

KN_Canova_PC140_1936.jpg640px-SIA_140_Piana_Canova_veivolo_ad_ala_romboidale_a_terra.jpg
 
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