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Started By
Message
Inboard/Outboard Rotax Jet Engines
Posted on 5/25/15 at 1:45 pm
Posted on 5/25/15 at 1:45 pm
So I called today to ask about a Chaparral Vortex boat and the sales guy said the don't believe in them and the performance is terrible.
Any one want to explain why? I truly don't have any idea what could be wrong with them. I have seen many good reviews from Boattest.com and I am closing to buying a new boat and wanted to consider a Rotax jet.
Any one want to explain why? I truly don't have any idea what could be wrong with them. I have seen many good reviews from Boattest.com and I am closing to buying a new boat and wanted to consider a Rotax jet.
This post was edited on 5/25/15 at 6:13 pm
8
Posted on 5/25/15 at 1:59 pm to Vood
*edit* Never mind, I miss read the op.
This post was edited on 5/25/15 at 2:01 pm
Posted on 5/25/15 at 2:02 pm to Vood
What does he mean he doesn't believe in them?
It looks like it's basically the same thing as a sea doo or wave runner. Does he not believe in those?
I've seen that type of propulsion on a boat that was 125ft.
ETA: there are definite negatives to them but an in/out have negatives as well
If a rotax sucks up a rock or stick or anything like that it is done until you can get it out.
Same things can/will destroy a prop.
rotax can run in shallower water.
It looks like it's basically the same thing as a sea doo or wave runner. Does he not believe in those?
I've seen that type of propulsion on a boat that was 125ft.
ETA: there are definite negatives to them but an in/out have negatives as well
If a rotax sucks up a rock or stick or anything like that it is done until you can get it out.
Same things can/will destroy a prop.
rotax can run in shallower water.
This post was edited on 5/25/15 at 2:06 pm
Posted on 5/25/15 at 2:06 pm to Vood
What kind of idiot says they don't believe in a boat?
If it is properly designed, it'll be fine. I've never seen or ridden in one though
If it is properly designed, it'll be fine. I've never seen or ridden in one though
Posted on 5/25/15 at 2:42 pm to DownshiftAndFloorIt
So the guy was full of it? Buying a new boat is a much harder decision that I thought it was going to be.
I am going to using it on the lake in Madisonville and in the river. Would going salt to fresh water be a problem?
I am going to using it on the lake in Madisonville and in the river. Would going salt to fresh water be a problem?
Posted on 5/25/15 at 2:44 pm to Vood
Ten foe's dad has one, I think they have been very pleased with performance. You might need to bump this tomorrow.
Posted on 5/25/15 at 3:12 pm to Vood
Jets are very popular up in Northwest Arkansas in all of the rock bottom lakes.
Im not positive, but ozarkanglers.com forums might have some talk about them.
Im not positive, but ozarkanglers.com forums might have some talk about them.
Posted on 5/25/15 at 4:10 pm to wickowick
The boat in question is not an outboard. It's like a seadoo boat.
I've been in a big seadoo boat and it preformed pretty well. Nothing to make me not want to buy one. But just like jet skis, you need to be under power to steer it
I've been in a big seadoo boat and it preformed pretty well. Nothing to make me not want to buy one. But just like jet skis, you need to be under power to steer it
Posted on 5/25/15 at 4:13 pm to DownSouthDave
I thought we were talking about these...
Posted on 5/25/15 at 4:16 pm to wickowick
That's what I thought too, because the op is incorrect. Chapparal doesn't make anything that would have an outboard.
Jet outboards are awesome. I would like to have one.
Jet outboards are awesome. I would like to have one.
Posted on 5/25/15 at 4:32 pm to DownSouthDave
Regular jet drives are better than jet outboards.
True jet drives use buckets to direct thrust so you don't need a clutch and can get instant full power reverse. You can do a true crash stop with no worry of stalling the engine or tearing anything up because load is constant no matter what the bucket or the boat is doing. Real inboard jet drives (like a hamilton jet) are fantastic. Plenty of boats run them from small sea rays to giant crew boats.
The downside is they're expensive and not good for running in grass/slime/trashbags/etc
True jet drives use buckets to direct thrust so you don't need a clutch and can get instant full power reverse. You can do a true crash stop with no worry of stalling the engine or tearing anything up because load is constant no matter what the bucket or the boat is doing. Real inboard jet drives (like a hamilton jet) are fantastic. Plenty of boats run them from small sea rays to giant crew boats.
The downside is they're expensive and not good for running in grass/slime/trashbags/etc
Posted on 5/25/15 at 6:12 pm to DownSouthDave
quote:
That's what I thought too, because the op is incorrect
Thanks for pointing that out. I have corrected it.
Posted on 5/25/15 at 7:19 pm to Vood
Is there a port for access to the jet prop to clean it out should you suck something in?
I've seen that on the Yamaha and other jet boats but don't see where that port would be on this Chaparral...
I've seen that on the Yamaha and other jet boats but don't see where that port would be on this Chaparral...
Posted on 5/25/15 at 7:44 pm to Vood
Pros of an inboard jet-drive:
1. Shallow draft.
2. Better maneuverability at speed.
3. Better acceleration
4. More resistant to debris damage. Pump will expel rocks and most things with little damage.
5. Packaging allows for more space in the hull (like a larger fuel tank) and more room on aft deck.
6. Safety, no exposed propeller.
Cons:
1. Noisier, they generally require more RPM and pump cavitation on the low pressure side will let you know it's running.
2. Less maneuverable in low-wake zones and at the dock.
3. Most don't have adjustable trim so cruise speed and fuel economy will suffer.
4. Eventual maintenance will require replacement of the wear ring in the impeller housing. Depending on model this can be a fairly significant expense.
5. With Rotax the oil changes are a PIA and you really need to use their full synthetic oil. Those a very high strung engines and they need the added EP additives.
1. Shallow draft.
2. Better maneuverability at speed.
3. Better acceleration
4. More resistant to debris damage. Pump will expel rocks and most things with little damage.
5. Packaging allows for more space in the hull (like a larger fuel tank) and more room on aft deck.
6. Safety, no exposed propeller.
Cons:
1. Noisier, they generally require more RPM and pump cavitation on the low pressure side will let you know it's running.
2. Less maneuverable in low-wake zones and at the dock.
3. Most don't have adjustable trim so cruise speed and fuel economy will suffer.
4. Eventual maintenance will require replacement of the wear ring in the impeller housing. Depending on model this can be a fairly significant expense.
5. With Rotax the oil changes are a PIA and you really need to use their full synthetic oil. Those a very high strung engines and they need the added EP additives.
This post was edited on 5/25/15 at 7:46 pm
Posted on 5/25/15 at 7:47 pm to cdaniel76
I don't know about the reliability of Rotax 4 stroke supercharged engines. I have owned some Rotax 2 strokes w carbs in Sea Doos and I had to work on them Mon-Fri. to ride Sat-Sun. Water hyacinth and lilly pads will shut you down with quickness.
Posted on 5/25/15 at 7:51 pm to Clames
quote:
3. Most don't have adjustable trim so cruise speed and fuel economy will suffer
That's not true at all. Hell, my 2002 SeaDoo RX had trim and that was 13 years ago.
quote:
With Rotax the oil changes are a PIA and you really need to use their full synthetic oil.
This is most definitely true! And don't think you can get away with using a non-rotax full synthetic marine oil either! I'm fairly certain this is what killed mine. Although I'll never know. My Rotax locked up on me on the first trip after I tried using non-rotax oil. Brought it to a shop in Chalmette. This was a week before Katrina... Never saw my seadoo again!
This post was edited on 5/25/15 at 7:55 pm
Posted on 5/25/15 at 7:52 pm to Clames
quote:
Pros of an inboard jet-drive:
1. Shallow draft.
2. Better maneuverability at speed.
3. Better acceleration
4. More resistant to debris damage. Pump will expel rocks and most things with little damage.
5. Packaging allows for more space in the hull (like a larger fuel tank) and more room on aft deck.
6. Safety, no exposed propeller.
Cons:
1. Noisier, they generally require more RPM and pump cavitation on the low pressure side will let you know it's running.
2. Less maneuverable in low-wake zones and at the dock.
3. Most don't have adjustable trim so cruise speed and fuel economy will suffer.
4. Eventual maintenance will require replacement of the wear ring in the impeller housing. Depending on model this can be a fairly significant expense.
5. With Rotax the oil changes are a PIA and you really need to use their full synthetic oil. Those a very high strung engines and they need the added EP additives.
this information is fantastic. Thanks Clames
Posted on 5/25/15 at 8:16 pm to cdaniel76
quote:
That's not true at all. Hell, my 2002 SeaDoo RX had trim and that was 13 years ago.
My brother's SeaDoo jet boat did not. The 18-footer Glastron's with the jet-drives do not while the same model with a standard outboard or stern-drive do. Jet-drive boats often don't offer trim adjustment because the impeller will start sucking air. That issue is part of why the hulls are designed to increase the wetted surface area on plane (that's also why their fuel economy and top speed suffers a bit). Another plus with the larger Rotax jet-drives is that they use a closed-loop coolant system that uses the pump plate as a large heat exchanger with the water.
Posted on 5/25/15 at 9:56 pm to Clames
I know most of the big boats don't have trim. It doesn't do much good anyway on a 200+ foot jet boat
I love jet drives. They're so much easier on motors than props and the full power crash stop capability is awesome.
I love jet drives. They're so much easier on motors than props and the full power crash stop capability is awesome.
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