Bouncing Carriage
For Mystery of the Yellow Room we had to build a carriage that would bounce along as 4 people rode on it. The director wanted a little more than the benches, but it had to bounce with out the actors doing the bouncing. The solution, motorcycle springs.
With two platforms separating 6 springs we were able to make 800lb bounce just like the horse was pulling. A crew member would hide behind the contraption making it bounce and also allowing it to roll on and off without a complicated automation system.
