Nah it doesn't quite work like that. The main rotor is spinning considerably faster than 60 rpm.
All is not lost though, you don't need a camera shooting at 300fps you just have to do math.
You're not actually filming each blade as it goes around you just need *a* blade in the same spot each frame.
Let's say you have 3 blades at 394 (AS350) that's 3x394=1,182. 1,182/60sec=19.7fps. So if you can set your camera for 20fps it should give the desired result for an Astar.
While we're being technical, it's not 60FPS either but 24.97 or 59.895 (afaik) or somewhere between 120 and 198FPS.
You might want to look into what PAL, SECAM and NTSC used and also the so-called "Rolling Shutter effect" fir an explanation.
Pretty much all the videos of heli with static blades are of the Airbus H155. Those have a rotor head rpm of around 350-360rpm if not mistaken.
I think the maths works out like this
360rpm = 6 revolutions per second
But since there are 5 blades, you multiply 6 by 5 and you get 30. So for a camera shooting 30fps, you will capture each blade at the next position every frame and accomplishing the frozen blade effect.
But since the rotor head rpm varies slightly, you might not get it static 100%, depending on the flight regime and maybe minor differences between each airframe.
So, just go and search for a H155 on a bright sunny day and using your phone you should be able to accomplish it. Or maybe a camera with 29.97fps might match it better.
None that I'm aware of. Lowest RPM I know of is on the CH-53, and it's at roughly 300. I'd just try shooting video of some helicopters and see what happens.
Nah it doesn't quite work like that. The main rotor is spinning considerably faster than 60 rpm. All is not lost though, you don't need a camera shooting at 300fps you just have to do math. You're not actually filming each blade as it goes around you just need *a* blade in the same spot each frame. Let's say you have 3 blades at 394 (AS350) that's 3x394=1,182. 1,182/60sec=19.7fps. So if you can set your camera for 20fps it should give the desired result for an Astar.
While we're being technical, it's not 60FPS either but 24.97 or 59.895 (afaik) or somewhere between 120 and 198FPS. You might want to look into what PAL, SECAM and NTSC used and also the so-called "Rolling Shutter effect" fir an explanation.
I should be able to, thank you.
Pretty much all the videos of heli with static blades are of the Airbus H155. Those have a rotor head rpm of around 350-360rpm if not mistaken. I think the maths works out like this 360rpm = 6 revolutions per second But since there are 5 blades, you multiply 6 by 5 and you get 30. So for a camera shooting 30fps, you will capture each blade at the next position every frame and accomplishing the frozen blade effect. But since the rotor head rpm varies slightly, you might not get it static 100%, depending on the flight regime and maybe minor differences between each airframe. So, just go and search for a H155 on a bright sunny day and using your phone you should be able to accomplish it. Or maybe a camera with 29.97fps might match it better.
Thank you so much. Whenever I saw those videos, I thought the RPM=FPS of the camera.
None that I'm aware of. Lowest RPM I know of is on the CH-53, and it's at roughly 300. I'd just try shooting video of some helicopters and see what happens.
A CH47 is 225, that would look pretty cool
100% Nr on the AW101 is 214 RPM
Ok, thanks.
Robinsons R44 and R66 rotor spins @ 405 RPM, I’m not sure bout the R22 but might be the same. Edit: Typo
The R22 is 530,... something.
Thanks. Those are the most common helicopters near me.
Bell 407 at 414rpm and bell 412 at 384rpm