Algodoo

This is the 3rd spring engine I conceived, loosely based (and improved upon) another engine, which required severe braking in order to handle the resonance.
My version doesn't need the braking at all, and only suffers resonance when exposed to a tough load, made all the less likely to happen by utilising several of these in tandem.
(I should specify that it's the engine itself that won't resonate, but when connected to, as an example, the wheels of this vehicle, once those wheels start resonating, so will the engine).

I've had this sitting around for 2 years, and upon attempting improvements with higher simulation frequency, I find this thing actually stops working; absolutely is optimised for 60 Hz.
- This is actually the engine in the Super Traccy, just without the sprung housing for the wood disc.

Controls:
- To get going, press F, V, R, then S.
F is the clutch, V the wheel brake, R the engine brake, and S the starter.
Emergency brake is on C.
- In order to change which direction this goes in, you need to fiddle around with timing your release of the S key., easy enough once you can read the force springs.

(I should note, that due to some weird choices by myself, the wheel brake is technically the output brake, and only stops the wheels when the clutch is on)

Driving this thing does take some amount of skill; no simple "push and go" as is the case with my more modern vehicles.
The engine will resonate, and effectively break itself, with heavy loads on it, so when going up a hill, use a mixture of engaged and disengaged clutch to get it up.
- A bit like driving a Manual in start-stop traffic. (Basically, just take the clutch off if the engine starts wobbling)

As for going downhill, at that point, the wheels will resonate. In that case, you'll just have to press R and let it roll off, relying then on ample use of S to get it spinning the right way again.
Probably could resolve this by including a gear clutch, but for the sake of preserving this, I'll omit for the time being.