<< Previous Next >>


Photo Information
Copyright: Francisco Mello (Mello) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 140 W: 34 N: 480] (2419)
Genre: Animals
Medium: Color
Date Taken: 2010-01-31
Categories: Insects
Camera: Nikon D300, Sigma 105 F2.8 Macro.
Exposure: f/7.1, 1/200 seconds
Photo Version: Original Version
Date Submitted: 2010-03-01 5:14
Viewed: 3686
Points: 36
[Note Guidelines] Photographer's Note
Hello my friends,
Today I'd like to say thanks about the 2000th, but to much more thanks because you teach me a lot and as far as I know I learned a lot with you (I hope you can see this...hehe) and the points are only a little detail here.
I tried to take some shots yesterday to post today, but it was raining. So, I have to post this "old one" from my Odonata collection. I hope you like this one and this week I'll post my yesterday raining shots...

Read, it's cool...

How dragonflies use their four wings
By Roger Highfield, Science Editor
Published: 1:06PM BST 14 May 2008

Dragonflies operate each wing independently

Scientists have discovered how dragonflies use their four wings make flying more efficient and faster.

They may now look to use the same aerodynamic tricks used by the insect for 300 million years to help develop artificial insects for use on the battlefield.

Already some of the mechanisms are used by military aircraft with propellers, notably Russia's "Hokum" helicopter and its Bear (Tu95) bomber, say scientists from the Royal Veterinary College and University of Ulm.

While other flying insects have evolved one pair of wings, the dragonfly operates each wing independently.

The reason for this unusual design seemed even more puzzling when earlier work suggested that four wings are less efficient than two.

Dr Jim Usherwood and Dr Fritz-Olaf Lehmann used a specially designed robot dragonfly to examine the aerodynamics of four winged flight.

The findings, published today in Interface, a Royal Society journal, show that, as well as allowing backward, nimble and high acceleration flight, four wings can be more efficient too.

Dr Usherwood said: "We found that two pairs of wings can allow the dragonfly to produce higher forces, allowing acceleration and climbing, while, if the wings flap with the right timing, the lower wings are able to reduce the energy wasted."

In order to hover a dragonfly, just like a helicopter, has to push air downwards – this is referred to as the 'wake' or 'downwash'.

Any air motion that isn’t downward fails to support the body and is wasteful. But the dragonflies are able to use their lower wings to recover energy wasted in side to side air motion in the wake ­ if they flap their wings at right time.

Working with robot dragonflies they found that, while most of the flapping timings were less efficient than hovering with one pair of wings, there were some instances when flapping with two pairs was more efficient - by around 20 per cent - because it required less power to lift the same weight as just one pair of wings.


jhm, roges, rousettus, Juyona, maurydv, hansh, horias, siggi, flashpoint, Noisette has marked this note useful
Only registered TrekNature members may rate photo notes.
Add Critique [Critiquing Guidelines] 
Only registered TrekNature members may write critiques.
You must be logged in to start a discussion.

Critiques [Translate]

  • Great 
  • jhm Gold Star Critiquer/Gold Note Writer [C: 893 W: 0 N: 507] (1853)
  • [2010-03-01 5:21]

Hello Francisco,

Also in Belgium got we yesterday a lot rain and a heavy storm 120km/h.
Happy we see a very great macro picture with these head of the dragonfly.
Head and legs are very well taken.
Nice detailed picture. TFS.

Best regards,

  • Great 
  • foozi Gold Star Critiquer/Gold Note Writer [C: 2791 W: 0 N: 6696] (25839)
  • [2010-03-01 5:22]

Hi Francisco,
excellent capture in superb sharpness. The hairs surrounding the body is well seen and the thorns on the legs is really well featured.
Congratulations on your 2000th.


  • Great 
  • roges Gold Star Critiquer/Gold Note Writer [C: 957 W: 0 N: 1329] (6264)
  • [2010-03-01 5:32]

Hola Francisco,
una captura splendida.
Super composição você, parabéns.
E saudações aos 2.000 pontos quentes e reuniu muito sucesso no futuro.
Estes pontos são mais ou menos "espelho" do seu trabalho fotográfico.
Sim, você está certo, o progresso tem sido visto e ser visto.
Um dia e uma semana maravilhosa,

Ciao Francisco, congratulations for your 20.000 points on TN and thanks for all your splendid photo, great portrait of beutiful dragonfly, wonderful light and colors, fantastic details, lovely blurry BG and excellent sharpness, very well done my friend, ciao Silvio

hello Francisco
congratulations on your 2000 pts. I wish you many thousands. this is nice selection to celebrate and it is a great portraite work for beautiful dragonfly, with great focus, POV/DOF and composition. coloration also superb. but your notes also very nice and informative. nice to read them. thanks for sharing, best wishes

  • Great 
  • Juyona Gold Star Critiquer/Silver Workshop Editor [C: 2232 W: 10 N: 2971] (16891)
  • [2010-03-01 9:01]

Hola amigo,
sobresaliente trabajo,
impresionante macro,
con gran foco y detalles,

Hello Francisco,
a superb macros shot of this dragonfly taken with fine detail and marvellous colours, excellent POV, DOF and composition.
Best regards
Ciao Maurizio

This one is so impressive, Francisco, these "milky" eyes, the glittering nose, I love the colours and the sharpness, everything is perfect, thanks
Sabine - wishnugaruda

Hello Francisco,
Congratulations on your 2000 points! your work has been worth seeing. We have also learned much from your work and comments. Thank you very much for sharing!
The cut in this picture is superb, it is good as your technique provides fantastic performance, full of precise detail and balanced light. Good job!

  • Great 
  • PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5137 W: 166 N: 13121] (49139)
  • [2010-03-01 10:44]

Hello Francisco,
Fantastic macro to celebrate your 2000 pts. Excellent sharp details and beautiful natural colours. Nice contrasting OOF BG.

hello Francisco
great sharpness Macro shot with good pose and beautiful colours
congrat with the 2000 pnt.
greeting lou

  • Great 
  • hansh Gold Star Critiquer/Gold Note Writer [C: 277 W: 1 N: 741] (2762)
  • [2010-03-01 10:59]

Hi Francisco.

Congratulations with yoour 2k points and looking at this picture its understandble why you deserves them.
A very fine composition with splendid colors and well seeing details.
Thank you for sharing it and kepp going the good job.

Gr. Hans

  • Great 
  • horias Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 837 W: 58 N: 2084] (11033)
  • [2010-03-01 11:26]

Hello Francesco
Congratulation for your first 2000 points.
You deserve it abundantly!
Wonderful capture for this event!

Hello MF Francisco,
Congratulations for your 2000 smiles and for your interesting macro shots. You show us everyday fantastic animals from Brazil... and open the doors of a new world! Thanks my friend for all. This post is really amazing too, with fantastic colours, composition and sharpness! Cheers,

  • Great 
  • siggi Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3097 W: 109 N: 12399] (52850)
  • [2010-03-01 12:51]

very nice one Francisco,
the shot is a pleasure to look at, a very nice shot and with good details and colours, well done.Congratulations on your 2000 pts.
Best regards Siggi

Cioa Francisco. Best comoplimente for your 2000 pts. Interesting close up here with bright natural colours and intrigant playing of light. TFS Mf!


ciao Francisco!
a good cut to show this dragonfly blue eyes that stand out well against the BG neutral ... I also congratulate (a bit late)for the score of green faces!!!!
um abraço sERGIO

Hello Francisco
a fine macro shot of this odonata, and congratulations for your 2000 pts
beautiful POV and great focus on his wonderful green eyes
lovely composition
Have a good night

Calibration Check