COUNTRY CLUB JETTER
Posts: 6
Joined: 7/8/2008
From: PALM DESERT, CA, USA
Status: offline
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I have been reading the jetboat thread for the last few hours, and I'm really impressed with the stuff you guys have done. I do have some questions about this stuff, because I am about as new as you can get to any of this.
I have owned jetboats for years now, and am very familiar with how to set them up. A lot of what you guys are doing is so close to real world applications, that I am truly amazed at what you have all done. The 'trim tab' if you wanna call it that, is exactly what is used in full sized applications, only it's called a ride plate. The purpose is to trick the boat into thinking it is longer than it really is, which allows for more power, the motor being set back further than it normally would be, and ultimately with a better ride... ideally to eliminate porpoising. Encompassing a water pickup off the jet nozzle, or even off the suction housing for cooling purposes made me chuckle out loud because that is exactly how real jetboats work.
That being said, I do have a ton of questions.
1. I am looking at building a jetboat in the 24"- 36" range, mono hull. I don't have any idea who makes a good one, that can take a little abuse. I will not be running rapids or anything; I just don't want something that I will break in half in an afternoon. Fiberglass? Carbon Fiber? I have no idea. Is there a formula of sort that can help one figure out what drive / motor / hull won't porpoise, or not have enough power? What hull do you guys recommend?
2. I was looking at the swashdrive jets originally, but they seem to be indefinitely backordered. My next option was to get one of these.
I don't know if that's a good one or not, or if it's too big/small, and if the driveshaft can be mated up with any motor with a coupler or not. When it comes time to cut a hole in the hull for the pump, do I glass it in? They are thru-bolted in real life; don't know how you guys do it. What about the motor, do I glass that in? In a hull that sized, I could machine a little rail kit (again, how it's done in the big boats) and glass that in, and bolt the motor to that.
3. What motor to use? Brushless I imagine, but I don't know. I will be running a cooling system I'm sure, just like a lot of you guys have. I would like (if possible of course with a hull this size) to see some good speed, but I don't wanna burn out the drive because it is spinning faster than it oughta be. But, like most of us, I'd like to put a kick ass motor in.
4. Batteries. Is there a trick way to mount them, or are they just zip tied somewhere inside the hull? LiPo? Based on what motor you may recommend, is there a certain battery pack that I should definitely use? How long of a life can I expect for each run? Ten minutes or so, or maybe longer? I will most likely pick up a few packs and always have one ready to go.
I guess I better buy a dremel soon, and get this going. Never done it before, and honestly I'm really looking forward to monkeying around with this stuff. Thanks in advance for any advice you guys can offer.
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Jet Boat Question - 
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