boats 35 jetdrive
One thing you probably noticed when you blew your bubbles was that no matter how far up or down the soda glass you put your straw, it still took the same amount of effort, right? Even as you got nearer and near the top, you probably were still breathing pretty hard, werent you?
At this point, you probably pulled your straw out of the soda a little way and blew bubbles again only this time you found something else out -- if you blew on the top of your soda not only would you be creating bubbles, but you could direct a stream of those bubble and their liquid in your soda at your pesty brother or sister. Are we right so far? If you think about it, youll probably admit we were more correct about it that you like to think about. (Nobody likes to think of themselves like that or at least no one weve met!)
With the straw and your soda, youve just demonstrated exactly how the jet drive of a personal watercraft works. The manufacturers found that they didnt have to weigh each of those water-bound snowmobiles (thats where they took their form and function) with a standard propeller and drive as well as all the other underwater equipment needed to make a standard screw function.
No, instead, the manufacturers found that if they blew a high-pressure stream of air down at the surface of the water or even just a little under water, the jet-drive personal water craft would take off at high speed in just about any conditions.
Barring low-speed trolling when a propeller is warranted -- for which a whole series of electric motors have been built -- jet drives are perfect for those highly maneuverable and fun-to-drive individual watercraft.
Just by blowing a high-speed stream of air from a compressor-driven high-speed air guide system, the manufacturers found they had craft that could turn on a dime and were good in fairly quiet water. Heavier seas tend to swamp these jet drives as they are not built to the same standards a jet drive for a go-fast, cigarette boat is built. After all, the go-fast is likely about six or seven times the size of the individual craft and weighs about as much as an NFL defensive lineman. Yes, the lineman is a big guy and its tough to move him, if, and only if, youre another player. However, if youre running in a sudden wind thats come up at you from 45 degrees off of starboard beam at 18 knots (about 23 mph), you may find that your suddenly maneuverable jet drive is next to useless. Its about this time you wish you had a screw in the water (Archimedes style, that is) because youll find that your little jet-driven rooster tail is next to useless i this type of wind.
And, if a big chop arises, youll also find that your little jet drive cranked over all the way to counteract the chop will likely just keep you holding place.The standard high-speed jet drive is little more than a form of high-speed jet engine that consists of an impeller that sucks water into the case, a compressor that increases the pressure of the water after it travels through a series of decreasing-sized galleries and a compressor blade assembly that forces the pressurized stream of water through another series of venturie galleries (centuries are pipes that start out wide and end up narrow and effectively increase the strength of a stream of water. Finally, the water is forced out the engine jacket -- through a hole near the water line that forces the craft forward.
In truth this is great for instant starts and quick turns in calmer water such as lakes, but when you hit the open ocean you need a boat or larger version of the jet drive boat to be effective. You might even need a standard screw-style prop to make things work correctly.