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Old May 07, 2010, 06:57 PM
Slope Sauce
trees's Avatar
White Salmon WA
Joined Oct 2009
770 Posts
Discussion
Unofficial Bird (Animal) Wing Loading and Aspect Ratio Database

While sloping with birds or observing them in everyday situations I often wonder what their specs are, mainly wing loading and Aspect Ratio. I'm hoping, with your help we can compile a database of such figures. Once you post data I'll clean it up (if necessary) and add it to Post #1.

Disclaimer: Due to varying sizes of birds within each species, one must either have exact dimensions of a specific bird or use a rough average for that species to calculate wing loading, etc. The following database is intended to be fun and give ROUGH estimates of certain bird specs. Math is not my forte. If you see a figure that looks off and you feel confident that my calculations are inaccurate please feel free to kindly correct me and I'll update the information.

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Tools & References:

Wing Loading Calculator
Bird Flight

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If you add a bird to the database please provide the following details/averages (cut & paste into your post)...

Species:
Weight:
Wingspan:
Root Chord:
Tip Chord:
Average Chord:
Length:
Wing Area:
Wing Loading:
Aspect Ratio:

Wiki Link:

Notes:

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The Birds...

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Species: Red-Tailed Hawk
Weight: 36 oz.
Wingspan: 47
Root Chord: 7.25"
Tip Chord: 4.25"
Average Chord: 5.75
Length: 26
Wing Area: 270.25 sq/in
Wing Loading: 19.182 oz/sq.ft
Aspect Ratio: 6.48

Wiki Link: http://en.wikipedia.org/wiki/Red-tailed_Hawk

Notes:

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Species: Osprey
Weight: 73.6 oz.
Wingspan: 70"
Root Chord:
Tip Chord:
Average Chord:
Length: 26"
Wing Area:
Wing Loading:
Aspect Ratio:

Wiki Link: http://en.wikipedia.org/wiki/Osprey

Notes: Still searching for specs

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Species: Common Gull/Mew Gull
Weight: 20 oz.
Wingspan: 44"
Root Chord:
Tip Chord:
Average Chord: 3.18"
Length: 18"
Wing Area: 139.92 sq/in
Wing Loading: 20.583
Aspect Ratio: 13.8

Wiki Link: http://en.wikipedia.org/wiki/Common_Gull

Notes: A carnivore that loves French fries.

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Last edited by trees; May 08, 2010 at 08:29 PM.
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Old May 08, 2010, 12:14 AM
EPP Extrordinare
Mr. Combat Certain's Avatar
United States, CA, San Clemente
Joined Feb 2008
3,330 Posts
Red-Tailed Hawk specs:

Came across this after eading this thread, thought it was interesting,http://books.google.com/books?id=Ux2...page&q&f=false scroll down to page 8 for measurments, cant believe someone took the time to measure an entire hawk!

Wingspan: 43-57"

Length: 18-26"

Root chord length: 7.25" (proportional to size of bird, in this case it is porportional to a bird with a 47" wingspan)

Tip chord length: 4.25" (proportional to size of bird, in this case it is porportional to a bird with a 47" wingspan)

Weight: 1.5-3lbs.

Aspect ratio: 6.48
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Old May 08, 2010, 03:46 AM
Slope Sauce
trees's Avatar
White Salmon WA
Joined Oct 2009
770 Posts
The detail in that book is amazing! I might just ask for that as a birthday gift. Thanks for kicking off the thread with our first bird.
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Old May 08, 2010, 04:38 PM
Phil.T-tailer
Phil.Taylor's Avatar
Devon, UK
Joined Jun 2003
4,248 Posts
watching this with interest - haven't got any figures to add though - waiting for the "average seagull" post!

For the hawks - worth noting that the tip feathers increase the effective A/R dramatically - IIRC some work has been done on this for models & full-sized - "wing-grid" tips.

gotta get a Swift or Swallow in there too - awesome flyers

Phil.
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Old May 08, 2010, 05:24 PM
Slope Sauce
trees's Avatar
White Salmon WA
Joined Oct 2009
770 Posts
The data is harder to obtain online than I anticipated. It looks like I may have to go to the Library. Do those things still exist?

I do know the wing tips are significant enhancements but I have no clue how to figure that into the calculations at this point. I'm hoping a math nerd, Ornithologist, RC junkie chimes in with some magic formulas and figures.

Yes, Swifts and Swallows are way cool. I can't wait to see them on the list.
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Old May 08, 2010, 06:14 PM
Long to be flyin'
Antonsoarer's Avatar
Wirral, (UK)
Joined Dec 2003
3,056 Posts
Great thread idea

Trees,you have enough info on the gull above to get the loading:
Species: Common Gull/Mew Gull
Weight: 20 oz.
Wingspan: 44"
Root Chord:
Tip Chord:
Length: 18"
Wing Area:
Wing Loading:
Aspect Ratio: 13.8

So:

Span 44"
AR = 13.8
44/13.18 = average chord = 3.18"
3.18 x 44 = 140"
140/144= 0.97-sqft
Loading 20oz/0.97= 20.6oz-sq-ft

Tony.
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Old May 08, 2010, 08:29 PM
Slope Sauce
trees's Avatar
White Salmon WA
Joined Oct 2009
770 Posts
Thanks Tony!
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