For each engine type - a certain displacement, cylinder design and configuration - the fee is $24,000.
This double cylinder design raises a safety issue.
For the 18 cylinder design, it was possible for firing events to be interlaced over all six banks.
It should be noted that the 9 cylinder design, having three banks of cylinders, has its crankshafts rotating in the opposite direction.
It had an even better cylinder design than the Class 14, with larger and straighter ports that resulted in a very sharp, free exhaust.
The revolving cylinder design, while popular with pistols, did not work well for rifles.
Another solution was to use a revolver with a detachable cylinder design.
Because of this, many modern large caliber hunting revolvers tend to be based on the fixed cylinder design.
The three cylinder design fitted to the class gave it a distinctive off-beat exhaust sound when climbing upgrade.
Nevertheless Gilman pressed ahead with the cylinder design, building a "paper project" V-12 engine.