Anti gravity anyone....

wes1001 · Post by **wes1001** » Fri May 18, 2007 11:28 am

Newtons law is officially debunked

http://www.break.com/index/helicopter-b ... oving.html

Blue406 · Post by **Blue406** » Fri May 18, 2007 12:05 pm

Freak FPS sync. Very neat though!

Post by **Welly** » Fri May 18, 2007 12:31 pm

Blue406 wrote:Freak FPS sync

You said what now?

mjb · Post by **mjb** » Fri May 18, 2007 2:07 pm

Welton wrote:
Blue406 wrote:Freak FPS sync
You said what now?

Helicopter (and prop-driven aeroplane) rotors never change speed - the pilot actually controls the amount of lift generated by pulling a lever (the collective pitch control) which alters the angle of the blades as opposed to the rpm of an engine like a car. Now imagine if the helicopter's roters spin at 300rpm. This means that each full rotation of the rotor will take 0.2 seconds. There's 5 rotors, so there will be a rotor blade pointing straight forwards every 0.04 seconds.

A video camera may record at (say) 25 frames per second, which is 0.04s between each frame.

See where this is going? Every 0.04 seconds the camera records a frame and all it sees is 5 rotor blades in the same positions as when it last took a frame. Since neither the camera speed or rotor speed is changing, it just looks like the rotors aren't turning at all... If you were to paint one rotor a different colour and view the video in slow motion, you would see each rotor in turn appearing to change colour.

Post by **Welly** » Fri May 18, 2007 2:25 pm

Who's a clever boy then

I did think it was something to do with shutter speed if you like, a bit like when you see wheels going 'backwards' on TV.

.......and FPS is 'frames per second' now I know what bluey meant.

Well done for such a consise reply, for a Friday

Me thinks you have some kind of electro/mechanico interesto?

wes1001 · Post by **wes1001** » Fri May 18, 2007 6:24 pm

Welton wrote:
You said what now?

LOL direct and to the point

mjb · Post by **mjb** » Fri May 18, 2007 7:04 pm

Welton wrote:Well done for such a consise reply, for a Friday

You mean concise? (YESSSSSS! GOTTIM!

)

You can't beat procrastination on a Friday afternoon...

Me thinks you have some kind of electro/mechanico interesto?

Ish. Interested in military aviation and electronics as well as a life-long necessity to know exactly how and why everything works the way it does

Captain Jack · Post by **Captain Jack** » Sat May 19, 2007 1:05 am

Cool

Post by **Welly** » Sat May 19, 2007 10:59 am

mjb wrote:
Welton wrote:Well done for such a consise reply, for a Friday
You mean concise? (YESSSSSS! GOTTIM! )

You can't beat procrastination on a Friday afternoon...

Bastardo!

Me thinks you have some kind of electro/mechanico interesto?
Ish. Interested in military aviation and electronics as well as a life-long necessity to know exactly how and why everything works the way it does

like your heated seat, for example

mjb · Post by **mjb** » Sat May 19, 2007 4:38 pm

Welton wrote:
Ish. Interested in military aviation and electronics as well as a life-long necessity to know exactly how and why everything works the way it does
like your heated seat, for example

You... Bastard...

A month. I'll have it fixed in a month, and you can hold me to it, unless of course it's the elements screwed in which case it won't be fixed while I'm still in this job cos I can't do upholstery. Hmm wonder what my mom's up to ;) But I'll definitely have an answer in a month. The problem with the seats isn't lack of understanding, it's lack of access. I'm pretty much going to have to take the seats out to sort this unless I can find a decent mirror and lighting.

jameslxdt · Post by **jameslxdt** » Sat May 19, 2007 6:14 pm

just take the seat out, its only 4 torx 40 bolts (i think) holding it into the floor

mjb · Post by **mjb** » Sat May 19, 2007 7:02 pm

jameslxdt wrote:just take the seat out, its only 4 torx 40 bolts (i think) holding it into the floor

Aye, I probably will tbh. I reckon I'll probably discover one of the heating pads is dead, in which case hopefully I'll just be able to do a little hack and cut the broken one out of the circuit unless they're both dead.