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50' Spencer with Jet Drives

Old 08-25-2018, 06:05 AM
  #41  
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Originally Posted by peptide View Post
There's only one set of garages quite like that on the American side of Lake St. Clair, so it almost has to be Mac Ray. There's some other garages (I'm in one) but the inside of the roll down doors look different from those.
I thought those garage looked familiar. I'm originally from up that way. Definitely not the boat you'd expect to see every day up there, but really a sweet set up for all the shallow water.
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Old 08-26-2018, 01:34 AM
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Originally Posted by PowerYacht View Post
Jet Drives have always been more efficient to props. What is more efficient to a Jet Drive is a surface props especially if you go beyond 40 knots.
Ok, then please explain how come no one uses them in racing ............. the water after the impeller has a very high speed and it has to drag against the tube where the impeller is housed, its like if you put a prop inside a tube ( to make things worse the trajectory of the water is not sytraigh robbing more energy) does someone believe that this tube will not increase drag when compared to a bare prop ???, the only real advatages of a jet are safety for swimmmers and fauna and shallow draft ....... otherwise everyone would be using them and every outboard manufacturer would be implenting them in their designs and motors ........... things I do not see happening, with the prices of gas if they where an increasing performace way of transferring power to water, you should be able to see them almost everywhere ............ it is like flying donkeys ......... I do not see many around another thing of course is the will of the owner to have a safer for swimmers, shallower boat which of course is up to him to have hs toys like he wants to
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Old 08-26-2018, 05:02 AM
  #43  
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There are pros and cons to jet drives. Owned a Hamilton for a while. Boss has a Hinckley and swears by the joy stick. Assume he doesn't worry about fuel economy. Top fuel jet drag boat runs 155mph, they are raced.
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Old 08-26-2018, 07:17 AM
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Cool idea if your primary objective is yachting/cruising. Looks like the clearance in back would create issues for serious Tuna and Marlin fisherman that normal prop/shafts don’t.
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Old 08-27-2018, 08:40 AM
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It is Mac Rae Harbor up on Lake St Clair. I made the delivery trip from N.C. to Michigan and the boat ran great. We ran offshore to NYC at 35 knots burning 70 gph, and crossing Lake Ontario we ran a steady 40 knots and burned 95 gph. The Waterjets are MJP Waterjets with Controls and CAT 12.9’s. The owner was out fishing yesterday and caught some nice fish, and upon initial sea trial the boat was touching 50 knots and there are some new things coming down the pipline.
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Old 08-27-2018, 10:58 AM
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Can you back down on a marlin with jet drives? I realize this boat was purpose built...but let's say this owner gets bored in 2 years and wants something different. Put on a tower/bridge and chase marlin!
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Old 08-27-2018, 11:32 AM
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cool!
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Old 08-27-2018, 02:49 PM
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Originally Posted by sand key View Post
Can you back down on a marlin with jet drives? I realize this boat was purpose built...but let's say this owner gets bored in 2 years and wants something different. Put on a tower/bridge and chase marlin!
Then he is screwed ................ unless willing to make a very big refit of a conventional or Zeus like system ........ screwed also if one day he plans on selling that very unusual, unefficient "thing"
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Old 08-27-2018, 03:02 PM
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I see no reason why it couldn't back down on a fish. It goes in reverse just like any other boat and like I mentioned earlier I think the jet drive might even offer an advantage because you don't have to worry about a typical transmission. You can literally go from full throttle forward to full throttle reverse and not be concerned with destroying gears and what not.
Also, there aren't any wheels for the fish to get in to. No longer would you have to be as concerned with the fish getting under the boat and getting wrapped in the props. I bet that the swim platform on this boat would be less of a hinderance at the end of the day than having a traditional set of props to contend with.
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Old 08-27-2018, 03:12 PM
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Originally Posted by captaintilt View Post
It is Mac Rae Harbor up on Lake St Clair. I made the delivery trip from N.C. to Michigan and the boat ran great. We ran offshore to NYC at 35 knots burning 70 gph, and crossing Lake Ontario we ran a steady 40 knots and burned 95 gph. The Waterjets are MJP Waterjets with Controls and CAT 12.9’s. The owner was out fishing yesterday and caught some nice fish, and upon initial sea trial the boat was touching 50 knots and there are some new things coming down the pipline.
Thanks for the information - I'll keep an eye open for her on the lake!
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Old 08-27-2018, 05:25 PM
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Originally Posted by CANARIANFISHER View Post
Ok, then please explain how come no one uses them in racing ............. the water after the impeller has a very high speed and it has to drag against the tube where the impeller is housed, its like if you put a prop inside a tube ( to make things worse the trajectory of the water is not sytraigh robbing more energy) does someone believe that this tube will not increase drag when compared to a bare prop ???, the only real advatages of a jet are safety for swimmmers and fauna and shallow draft ....... otherwise everyone would be using them and every outboard manufacturer would be implenting them in their designs and motors ........... things I do not see happening, with the prices of gas if they where an increasing performace way of transferring power to water, you should be able to see them almost everywhere ............ it is like flying donkeys ......... I do not see many around another thing of course is the will of the owner to have a safer for swimmers, shallower boat which of course is up to him to have hs toys like he wants to
All true. Jet drives run an intrinsically lower propulsive efficiency due to passing a smaller volume (and mass flow) of water, and accelerating it more, both as compared to a propeller. The duct losses also detract. And reversing is much less effective. At lower speeds and reverse the jets are less efficient.

But at and above a specific high planing speed (specific to each hull), the jets will prevail in efficiency due to the elimination of appendage drag (i.e. no lower unit in the water). Even this depends on the competing propeller drive system - as high-mounted or jack-plated outboards and surface drives reduce the appendage drag as well.
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Old 09-19-2018, 07:01 AM
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I was just on the boat again, and simulated backing down on a Marlin with the owner and some other people, and while it was calm, we were able to back up at 8 knots very easily without water coming over the transom, and still had more speed to gain in backing. We also didn't have any cavitation going under the boat, and very little if any vibration since we were just redeflecting the flow of water instead of changing direction of the props turning. Regardless, I can assure you that there is a lot of interest in jets being put into actual Sportfishing boats to start fishing tournaments.
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Old 09-19-2018, 07:41 AM
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Originally Posted by WaterDamage View Post
All true. Jet drives run an intrinsically lower propulsive efficiency due to passing a smaller volume (and mass flow) of water, and accelerating it more, both as compared to a propeller. The duct losses also detract. And reversing is much less effective. At lower speeds and reverse the jets are less efficient.

But at and above a specific high planing speed (specific to each hull), the jets will prevail in efficiency due to the elimination of appendage drag (i.e. no lower unit in the water). Even this depends on the competing propeller drive system - as high-mounted or jack-plated outboards and surface drives reduce the appendage drag as well.
This sums it up quite perfectly. There is a reason that almost all of the large fast ferries (35kts plus cruise) are powered by jet drives instead of conventional shaft drives. These vessels are meant to be continually operated at these high speeds. While in the mid 20 knot range conventional shafts will be more efficient
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Old 09-19-2018, 07:55 AM
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Originally Posted by CANARIANFISHER View Post
Then he is screwed ................ unless willing to make a very big refit of a conventional or Zeus like system ........ screwed also if one day he plans on selling that very unusual, unefficient "thing"
relax chief
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Old 09-19-2018, 08:04 AM
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Originally Posted by mmccull5 View Post

That's a nice rocket launcher for decoration!

May not be a dedicated fishing boat but I think it looks great.
That's not a rocket launcher, it's a cup holder! ;-)
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Old 09-19-2018, 08:15 AM
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Where are the windshield wipers? I also noticed a lack of wipers on the 57' blackwell. You think they are just relying on Rain-X? I think that would drive me crazy that my multi-million dollar boat didn't have some insanely efficient wipers. Sure are pretty lines on these boats from the gunnel down anyway.
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Old 09-19-2018, 09:26 AM
  #57  
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In S FL you keep the Sporty behind the house , up North ... in the Garage
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Old 12-17-2018, 05:52 AM
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Default well, found this video...

And what it shows about those jet drives is amazing. Gorgeous boat too...

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Old 12-17-2018, 06:13 AM
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Really Cool . 50+ ktns - Damn
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Old 12-18-2018, 05:30 AM
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Default F & S 64' with tower 51 knots

F & S has a 64 express hardtop with a tower that does 51 knots... for sale 4.5 mil
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