M. Klein Heerenbrink

OxfordAnimalFlightGroup - birds, flight, aerodynamics

[M. Klein Heerenbrink @MarcoKlH]

Yay!
https://t.co/GGc2mC67B4

[M. Klein Heerenbrink @MarcoKlH]

@ThomasEvans @EvansSre It's very close to the surface... Don't know about their wingbeat amplitude, but wouldn't the wing tips be in the water if it were flapping? I often see birds do decelerating glides over the water surface...

[M. Klein Heerenbrink @MarcoKlH]

@mcmahok @EvansSre @SofiMinano Definitely in ground effect there. That dramatically reduces the (drag) cost of producing lift as the downwash immediately 'hits' the surface.

[M. Klein Heerenbrink @MarcoKlH]

Science works! Exceeding windspeed downwind powered by the wind.
https://t.co/u8YzKWQ9y5
(After the previous video, I spent a day working through the physics before I was convinced...)

[M. Klein Heerenbrink @MarcoKlH]

It's #notahornet It's a giant horntail
Probably came from the wood they were laying in the garden...
@hulllive
https://t.co/R1oOSzqTPf

[Vroege Vogels @VroegeVogels]

We could hardly believe it when we got a message from Jos Baart telling us that Europe's biggest owl, the Eurasian eagle-owl, had made a nest in a planter in front of his window. Not only that, she had also hatched three giant chicks!
#vroegevogels #springwatch #owl

[M. Klein Heerenbrink @MarcoKlH]

@sankey_dan Glad I could help ^_^

[M. Klein Heerenbrink @MarcoKlH]

@sankey_dan Hi Dan, the variable you called 'power' you defined as the sum of all the non-flapping drag components, so it is actually a force. If you multiply it by the flight speed the result should be closer, except for the effects of flapping wings. Hope this helps

[Massimo @Rainmaker1973]

An impressive visualization of the vegetation intensity variations in Africa during a solar year https://t.co/ehTi7zft3J [more info about the Normalized Difference Vegetation Index (NDVI) https://t.co/mtgmvXZS8m] [data source: https://t.co/RyV1eBI9WM]

[M. Klein Heerenbrink @MarcoKlH]

Lesson in critical thinking: https://t.co/v27fVEEE6h

[Anders Hedenström @HedenstrmAnders]

Mechanical power curve measured in the wake of pied flycatchers indicates modulation of parasite power across flight speeds https://t.co/7dkfV1Swtt

[M. Klein Heerenbrink @MarcoKlH]

Fascinating story about pyromaniac birds... But beak of cover photo bird looks a bit unhealthy... Must have missed a few rostricure appointments
https://t.co/7cfXzWXMN8

[Emily Shepard @ELCShepard]

Calling flight researchers! Post-doc available and deadline timed so it's after the epic looking #SICB2018 @SICB_SPDAC https://t.co/MsLNvyVWcf

[M. Klein Heerenbrink @MarcoKlH]

@angelsharpmedia Nice pictures!
But... I think it should be Oxford Flight Group (@OxFlightGroup ) instead of Wytham Flight Dynamics

[Angel Sharp Media @angelsharpmedia]

Waggle Waggle Friday Feels... a clip from our Wytham Flight Dynamics shoot today!
@OxZooDept @WythamWoods1 @MarcoKIH @LucyLarks

[M. Klein Heerenbrink @MarcoKlH]

Anyone knows how to extract the 75k answrs from a fb post? I think 2250 of them should be correct...

[Dr. Kristen Crandell @kriscrandell]

This looks cool (&open source!): "Flowtrace: simple visualization of coherent structures in biological fluid flows" https://t.co/m9A8WeX5Tj

[M. Klein Heerenbrink @MarcoKlH]

They're getting lazier by the day...

[M. Klein Heerenbrink @MarcoKlH]

Our paper on aerodynamic power of moths is out (Warfvinge et al. ^^): https://t.co/KJgOOjT9Rn

[BirdLife International @BirdLife_News]

WATCH: the unbelievable mating display of the Hooded Grebe is caught on film for the first time https://t.co/h6MQQTsMKq