Make a Movie: Make your scaled model car fall and flip like real car

[SiBongJu]

I wanna make a movie with my car models, actually, Many people on youtube like using car models to make small movie.
However, there's a problem: How can you make your scaled model car fall and flip like real one.

As we know, gravity g=9.8m/s^2 or 32.174ft/s^2.

If a car's length is 4.9m, then it takes 1 second to fall from a "1 car length" height.
However, you scaled model is smaller (my paper model is 1:29.65), so it only takes 0.18 second.
It looks like "super-heavy gravity".

h=1/2*g*t^2
h/29.65=1/2*g*t'*2
29.65^0.5=5.4452, so t'=t/5.4452
You need to slow the video playback speed as 1/5.4452.

Here I don't think stop-motion is the best choice, because you have to take 25 pics (if 25 fps). And you need to use Photoshop to erase the bar which support the car in the air.
I suggest you use a high-fps video camera. 100 fps is not perfect, but acceptable. 200 fps is perfect.

I use 100 fps video to take a 3-second video (then the video file in the memory stick is 11s24f), and I slow it down to 16s8f, which makes the final fps is like 18.32fps. It's not so perfect, but acceptable.

You can see my dippy paper model falls and flips in this video. It looks like real.
If we just use normal fps and playback speed, it'll look like "super-heavy gravity".

It's just an experiment. The lights are not good, and I use my hand to flip the car model.
I'll do more research, calculation and experiments on lights, background, etc.

Sorry for my poor English.

Here's the video, you can see the model car falls and flips like real car.

[Kevin WS]

Thank you - very interesting.

Thinking about it stands to reason that scale gravity effect is needed. This never occurred to me though before.

[whulsey]

Interesting, had never thought about the scale gravity effect either.

The movies don't always get it right either on some of those, having seen my share of wrecks and been on my head a couple of times.