docholiday Posted December 14, 2011 Report Share Posted December 14, 2011 This little fella decided to have a bath just in front of me, now the shutter speed is 1/500 sec, enough to freeze a helicopter blade in flight. thats some speed he is shaking his head, you would think it would at least give him a headache !! Quote Link to comment Share on other sites More sharing options...
arjimlad Posted December 14, 2011 Report Share Posted December 14, 2011 Trying to make him go to rehab and he said.... ! Great pictures as always. Quote Link to comment Share on other sites More sharing options...
FalconFN Posted December 14, 2011 Report Share Posted December 14, 2011 (edited) Because I'm a science geek I worked out the rotational speed of the starling's head: I guessed the starling's head moved somewhere around 25 mm (0.025 m) in 500/1 s (0.002 s) so using the equation: speed = distance/time we get: Speed = 0.025 m / 0.002 s Speed = 12.5 ms-1 Speed = 28 mph Amazingly not that fast, despite the amount of blur. God, I'm such a looser. Edited December 14, 2011 by FalconFN Quote Link to comment Share on other sites More sharing options...
yankeedoodlepigeon Posted December 14, 2011 Report Share Posted December 14, 2011 So how fast is a rotor blade? Quote Link to comment Share on other sites More sharing options...
codling99 Posted December 14, 2011 Report Share Posted December 14, 2011 amazing pics,and cracking looking birds starlings. Quote Link to comment Share on other sites More sharing options...
-Mongrel- Posted December 14, 2011 Report Share Posted December 14, 2011 Because I'm a science geek I worked out the rotational speed of the starling's head: I guessed the starling's head moved somewhere around 25 mm (0.025 m) in 500/1 s (0.002 s) so using the equation: speed = distance/time we get: Speed = 0.025 m / 0.002 s Speed = 12.5 ms-1 Speed = 28 mph Amazingly not that fast, despite the amount of blur. God, I'm such a looser. Not seeing that mate, you don't see a car as a blur when it's moving at 28mph do you? Are you sure you haven't got the decimal in the wrong place and it's 280? Quote Link to comment Share on other sites More sharing options...
southeastpete Posted December 14, 2011 Report Share Posted December 14, 2011 it could have shaken its head half a dozen times inbetween frames...? Quote Link to comment Share on other sites More sharing options...
FalconFN Posted December 14, 2011 Report Share Posted December 14, 2011 Not seeing that mate, you don't see a car as a blur when it's moving at 28mph do you? Are you sure you haven't got the decimal in the wrong place and it's 280? You have to take into account the fact that a large car moving 25 mm won't appear to have changed position very much, but a small starling's head moving 25 mm will move (relative to it's origonal position) a large amount. I'll accept that I've guessed the distance the head moved and it could well be double that but certainly not 10 times faster. Anyway, great pictures - as usual. Quote Link to comment Share on other sites More sharing options...
andrewluke Posted December 14, 2011 Report Share Posted December 14, 2011 Not seeing that mate, you don't see a car as a blur when it's moving at 28mph do you? Are you sure you haven't got the decimal in the wrong place and it's 280? a boeing 747 is doing about 180-200mph just before take off but looks as if it's doing 30mph, andrew Quote Link to comment Share on other sites More sharing options...
straightbarrel Posted December 15, 2011 Report Share Posted December 15, 2011 (edited) Distance/scale is the main factor. Something travelling 28 mph 500 yards away gives the camera far more time to capture the image, try to capture something doing 28mph under your feet, very difficult. I'm not so sure that the calculation of 28mph is correct anyway. How can you possibly "guess the starlings head moved 25mm in 500/1's" Well you can guess, but that is about all you can do. Great pictures though, no matter what speed that stinkers head is travelling at! Edited December 15, 2011 by straightbarrel Quote Link to comment Share on other sites More sharing options...
FalconFN Posted December 15, 2011 Report Share Posted December 15, 2011 How can you possibly "guess the starlings head moved 25mm in 500/1's" Well you can guess, but that is about all you can do. It is a bit of a guess but the OP says 1/500th sec and the distance is a generous guess, it's probably less than that, you can tell by looking at the length of the blured spots on it's head and the beak blur. Quote Link to comment Share on other sites More sharing options...
straightbarrel Posted December 15, 2011 Report Share Posted December 15, 2011 (edited) It is a bit of a guess but the OP says 1/500th sec and the distance is a generous guess, it's probably less than that, you can tell by looking at the length of the blured spots on it's head and the beak blur. E=MC2...ohh and a beak blur Edited December 15, 2011 by straightbarrel Quote Link to comment Share on other sites More sharing options...
gluebeam Posted December 16, 2011 Report Share Posted December 16, 2011 Because I'm a science geek I worked out the rotational speed of the starling's head: I guessed the starling's head moved somewhere around 25 mm (0.025 m) in 500/1 s (0.002 s) so using the equation: speed = distance/time we get: Speed = 0.025 m / 0.002 s Speed = 12.5 ms-1 Speed = 28 mph Amazingly not that fast, despite the amount of blur. God, I'm such a looser. i would have thought that as its head is rotating and not moving in a straight line you would have to use the equation for angular velocity w= (v)sinθ/r Quote Link to comment Share on other sites More sharing options...
Bagsy Posted December 16, 2011 Report Share Posted December 16, 2011 i would have thought that as its head is rotating and not moving in a straight line you would have to use the equation for angular velocity w= (v)sinθ/r That's what I was thinking. Quote Link to comment Share on other sites More sharing options...
dastardlyandmuttly Posted December 16, 2011 Report Share Posted December 16, 2011 me and all if me calculator wasnt one of those solar powerd ones ad have worked it out tnite Quote Link to comment Share on other sites More sharing options...
garygreengrass Posted December 17, 2011 Report Share Posted December 17, 2011 To technical for me ,Nice pic Quote Link to comment Share on other sites More sharing options...
FalconFN Posted December 17, 2011 Report Share Posted December 17, 2011 You're right but I wanted the speed - as in the op - and not rpm (although the speed will differ the further you are from the axis). Quote Link to comment Share on other sites More sharing options...
gluebeam Posted December 17, 2011 Report Share Posted December 17, 2011 You're right but I wanted the speed - as in the op - and not rpm (although the speed will differ the further you are from the axis). yea so u would use velocity= w x r to find the tangential velocity of any point. Quote Link to comment Share on other sites More sharing options...
Mallard123 Posted December 19, 2011 Report Share Posted December 19, 2011 wow great pics Quote Link to comment Share on other sites More sharing options...
Actionpigeons Posted December 20, 2011 Report Share Posted December 20, 2011 (edited) To much free time on your hands all this working out, ...lol its a nice picture thow Edited December 20, 2011 by Actionpigeons Quote Link to comment Share on other sites More sharing options...
texas Posted December 22, 2011 Report Share Posted December 22, 2011 Good photo doc Quote Link to comment Share on other sites More sharing options...
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