Algodoo

Not sure if I understood.
The guns are phunlet-save and can be used in other scenes with ease. Most of them are cpu-friendly and shouldn't create much lag, even when used in large quantities. You can always reduce the laser fade distance and/or max rays in the script to make them a bit less flashy but even less laggy.

It's barely capable of walking at all

Hard to control, but funny

I don't see anything strange there

Very good idea!

Wow that's really useful! 10/10
I wonder why showing forces make them better computed.

It was made in 1.6.0, but I don't have any idea what in 1.7.1 might make it working different way

Epic!
10/10

I have used nearly identical idea in 20+ scenes arleady, but nice to see that other people try to invent things.
It's generally good way to make bomb, unless it explodes very close to something, creating enormously high repulsion. Moreover, heavy and light objects are blown away at the same speed.

The ghost car is unbelievable!
I agree with Cristianlol: I CAN'T COMPETE WITH THIS TOO.
100/10

I'm still thinking how to make it more real without putting scripts/attraction on the circles because that lags like hell.

well... high air friction multipier seems to do the same as hinging.

Great idea!
Maybe someone will build such thing in RL?

Good bow, but the invisible springs are a bit like cheating

With flyable planes, that could be really awesome
9/10

Thanks for feedback.
I'll try to make treb with smaller mass ratio. My goal is to reach supersonic speed with normal sized machine. I arleady archieved that but at mass ratio of over 8000.
I think this design is realistic in the way that parts have more or less realistic weight (but carbon composites could be needed ).

Nice explosion. But it could be better to add some engine to the missiles instead of launching them by spring.

really nice

I agree that wood cannot keep the forces, especially because arm is so light that it would be very thin when made with wood. But modern materials.. who knows? Carbon nanotubes have specific strength almost 100 times bigger than steel.

Wow, i'll try to build Merlin - I think that joining many slihtly curved polys to get smooth enough curvature might do the trick.
MR is very high, but at 400 m/s projectile has kinetic energy of 160.000 * mass, that corresponds to 16k times heavier counterweight falling 1m. In my machine it falls about 5-6m so I have 15-20% efficiency. Supersonic speed with MR of less than few thousand will need much space for CW to fall down.

Nice staging, but explosion needs some work, and should be a bit closer to ground I think. 9/10

without additional restrictions, you can throw as far as you want

Awesome 10/10

WOW. Very simple yet genius idea! Absolutely 10/10!

Laser with low speed is bent by attraction.
To make similliar explosions, create a 0 opacity circle, with high refractiveindex, and some attraction. Put laserpen on it that's slightly off-centered. Experiment with laser speed/color and circle refraction/attraction.

Funny, but that's 100% physics correct. One circle gains positive momentum/energy. Second one gains negative. Sum is zero. Conservation of momentum/energy is not violated.

explosion is too big and there's no way to reload. 7/10

Nice mushroom, but pretty big lag. (9% realtime on my 1.6 GHz)

Natural oscillation frequency is function of string length and speed of sound in the string, that depends on material density and tension.

wow 10/10