THE PHYSICS & CALCULATIONS OF THE POWERSKIJETBOARD OF THE G-FORCE TURN

These calculations were made on a previous prototype using a 25 hp. engine.
Since the Igniter 330™ production model has approximately 45 hp., the physics of a G-Force turn are much more extreme which translates to more power through your turns.

THRUST AND SPEED
In order to achieve high-speed performance, the water jet pump in the current Powerski Jetboard™ must deliver enough thrust to quickly accelerate the jetboard to maintain its speed, preferably from 15 mph to, in excess, of 40 mph.

To overcome both the water's drag on the craft, and the air resistance of the combined rider and jetboard, both resistances, being proportional to the square of the speed, and the required thrust for achieving this range of speed, were calculated to be in the range of 130 to 330 lbs.

In tests of the jetboard, a speed of 32-35 mph was measured on flat water at a measured pump thrust of 240-265 lbs.

WEIGHT AND ENGINE POWER
The engine, as the primary power source, must have sufficient power to propel the weight, or mass of the craft and rider to the desired speed range of 15 mph to over 40 mph.

The required engine-delivered power depends on the energy consumed per second to move the combined mass of the rider and craft through the water at the desired speed.

This power is calculated from 1/2 the mass times the square of the speed, divided by the efficiency of the jet drive pump system.

For the desired range of speeds, and applicable range of rider plus jetboard with a combined weight between 250 lbs. minimum to about 400 lbs. maximum, engine power of at least 14 hp. to more than 55 hp. are required.

One attribute of the PowerSki Jetboard™, is that a jetboard and rider weighing a total of 350 pounds, can achieve a constant measured speed of 32-35 mph with an engine rated at 25 hp. output.

This relatively high weight requires high-powered engines that are 30-50% of the total weight of the craft.

That much engine weight requires precise placement within the hull in order to allow a rear-mounted rider to pivot the jetboard during turns without the use of a steering mechanism.