[quote=“drake1storm, post:820, topic:42”]Foot crank powered bikes are easily the quietest vehicle.
That is all.[/quote]
Gas adds 25% of its power to noise, plasma 10%, batteries 3%, muscle 5%.
Meaning that by power to noise ratios, gas is loudest, muscles are 1/5th as loud, but batteries are quietest.
More relevantly, judging by numbers, electric motors are usually more powerful than a foot crank, and are therefore louder in practice.
Note that I have snipped a great deal of this code, the result of part_power§ * nc / 100; is applied to noise for every engine individually.
The effect of mufflers is based specifically on the engine in question, but 1 muffler per engine is ideal.
switch (part_info(p).fuel_type)
{
case AT_GAS: nc = 25; break;
case AT_PLASMA: nc = 10; break;
case AT_BATT: nc = 3; break;
case AT_MUSCLE: nc = 5; break;
}