Techno
11-25-2006, 10:04 AM
I didn't want to post this until I at least had working jets but just to clarify. whats being done heres it be.
http://i10.tinypic.com/2ci8f3a.jpg
Its pretty simple. A front shell that meets the transom at the correct angle. An intake section, impellor, stator, nozzle and reversing bucket controlled by a pneumatic ram. The bucket not only provides reverse but neutral with the motors still running... like a jet!
This is one of those its a my problem not a your problem. I have to travel through shallow water and am somewhat lousy at docking. I also don't like clunking my motor back and forth from reverse to forward or idling with it down channels to get to the lake. There are no ramps on the lake although one ramp is very close to it, the others are not. Shallow water means you trim the prop up so high your pushing the stern down anyway. Your prop is safe but your LWP are now vacuum cleaners sucking up mud or sand and it stays in the heads.There are also tiny ones like not smogging out a resturant as I'm pulling up to it. Or spraying myself by putting the thing in reverse.
And as a why not figured to use them while on plane to recharge the battery. I've dumped that idea since its too complex electrically. The motors would spin too fast and supply way too much amps too quickly.
This is the scooping idea for the jet. Much harder to make and more crap on the transom, not to mention the loading increase on the transom.
http://i15.tinypic.com/2w6dvn5.jpg
I began with the idea of using props but stumbled on using tiny jets instead.
With props they are fairly large and ugly but mostly need a very expensive speed controler a PWM, with reverse and x 2 drives at high amperage $$$$.
Jets on the other hand don't reverse the electric motor and speed is simply controlled by how much reverse bucket is hanging in the stream. And I can crab the boat sideways too.
2 are being used on the sponsons so the wide drive displacement is the steering. I was going to use 2- 2.5 hp 12v motors but gave that up as too hoggish on the battery.Besides they are heavy, almost as heavy as starter motors. Now am using 2- 1.5 hp motors so thats either .6 hp on 12 volts or 3 hp on 24v. A simple speed control just with that alone.
I don't expect the batteries to supply me with much time but if I want to take a slow cruise around the pond I should be able to do silently with no eye burning smog blowing past me... for a little while.;) After all how long can you take a few MPH?
BTW there are model jet drives for of course RC models. Most are tiny plastic peices of garbage but one is (was) made from aluminum and takes a much larger engine. What I'm making are not model jets drives since the intake is all wrong. They are auxillery drives for me, cause I like my cake and eat it too.:rolleyes:
http://i10.tinypic.com/2ci8f3a.jpg
Its pretty simple. A front shell that meets the transom at the correct angle. An intake section, impellor, stator, nozzle and reversing bucket controlled by a pneumatic ram. The bucket not only provides reverse but neutral with the motors still running... like a jet!
This is one of those its a my problem not a your problem. I have to travel through shallow water and am somewhat lousy at docking. I also don't like clunking my motor back and forth from reverse to forward or idling with it down channels to get to the lake. There are no ramps on the lake although one ramp is very close to it, the others are not. Shallow water means you trim the prop up so high your pushing the stern down anyway. Your prop is safe but your LWP are now vacuum cleaners sucking up mud or sand and it stays in the heads.There are also tiny ones like not smogging out a resturant as I'm pulling up to it. Or spraying myself by putting the thing in reverse.
And as a why not figured to use them while on plane to recharge the battery. I've dumped that idea since its too complex electrically. The motors would spin too fast and supply way too much amps too quickly.
This is the scooping idea for the jet. Much harder to make and more crap on the transom, not to mention the loading increase on the transom.
http://i15.tinypic.com/2w6dvn5.jpg
I began with the idea of using props but stumbled on using tiny jets instead.
With props they are fairly large and ugly but mostly need a very expensive speed controler a PWM, with reverse and x 2 drives at high amperage $$$$.
Jets on the other hand don't reverse the electric motor and speed is simply controlled by how much reverse bucket is hanging in the stream. And I can crab the boat sideways too.
2 are being used on the sponsons so the wide drive displacement is the steering. I was going to use 2- 2.5 hp 12v motors but gave that up as too hoggish on the battery.Besides they are heavy, almost as heavy as starter motors. Now am using 2- 1.5 hp motors so thats either .6 hp on 12 volts or 3 hp on 24v. A simple speed control just with that alone.
I don't expect the batteries to supply me with much time but if I want to take a slow cruise around the pond I should be able to do silently with no eye burning smog blowing past me... for a little while.;) After all how long can you take a few MPH?
BTW there are model jet drives for of course RC models. Most are tiny plastic peices of garbage but one is (was) made from aluminum and takes a much larger engine. What I'm making are not model jets drives since the intake is all wrong. They are auxillery drives for me, cause I like my cake and eat it too.:rolleyes: