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Re: Jet drive outboards [Re: DWC] #6946366
07/29/20 12:24 PM
07/29/20 12:24 PM

O
Oh Snap
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Oh Snap
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I owned a Valco flat bottom boat and it had a 115 jet on it, no tunnel and went all over the place and never had a problem. That was before any forums or tunnels,
I now have a Woolridge with a small tunnel just big enough to smooth the water to the jet foot. With the jack plate I can fine tune the jet for the load and change out for a prop for lakes and ocean.

Re: Jet drive outboards [Re: DWC] #6946371
07/29/20 12:27 PM
07/29/20 12:27 PM
Joined: Jan 2007
Posts: 25,424
Georgia
warrior Offline
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warrior  Offline
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Joined: Jan 2007
Posts: 25,424
Georgia
Originally Posted by DWC
Originally Posted by warrior
JMO, but I would not shy away from jets. As a matter of fact if I ever do the river rat thing again I will build a jet rig with tunnel and pods.
In my reading there's much said of the negatives and there are a few but further research indicates jets run best on hulls specifically set up just for jets. Hanging a jet off a standard hull is going to give you almost all the possible problems one can have with a jet and it's my belief this is where much of the negative press comes from. Comments from those who have spent the time and money to fine tune their rigs indicate the main intrinsic downsides to be loss of top speed vs prop, loss of max payload vs prop, and lower mpg. All of this is a result of the impellers inability to convert engine hp to equal what a prop can.
So if you can live with those three items and are willing to tune your rig I don't see a problem with jets in the right water.


Would love the tunnel, just not in the budget. The particular setup im looking at is a 1548 G3 with a Yamaha 40/30 pump. Both the same year. It didnt appear to have a jack on it, and it looks as if G3 paired these up to sell new, at least according to their website from that time frame. Any idea if manufacturers fine tuned these when set up? Ive read that if youre off high by as little as 1/4 inch, you can cause cavitation or be more susceptible to hitting something if too low. Id be very leary of buying a mismatched boat/motor that someone just found used and threw it on a random flatbottom.


I don't know that specific rig. I would assume they paired it to run well but probably not fine tuned, maybe the dealer did. That would be the question for me, was the dealer familiar enough with jets to set it up right or at least the original owner.
Next would be condition of the pump and impeller. Pull the grate and eyeball the impeller are the edges chewed up, check the clearance, check the bearings. This is the heart of the foot if has been sharpened and reset fine but has been done till there's no more life left. Next I'd look at the linkage for the clamshell. Not as prone to wear but it is exposed and can sustain damage.
Back to the rig, I wouldn't worry to much about misalignment unless it's obviously off. The leading edge of the grate should tuck just above the bottom of the hull. The main thing is it should not hang down below where it can get caught. Next check the hull. The transom weld should be smooth and perfectly flat to allow water to flow as one flat sheet to the grate.


[Linked Image]
Re: Jet drive outboards [Re: ] #6946383
07/29/20 12:34 PM
07/29/20 12:34 PM
Joined: Dec 2010
Posts: 11,135
Armpit, ak
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Dirt Offline
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Joined: Dec 2010
Posts: 11,135
Armpit, ak
Originally Posted by Oh Snap
I owned a Valco flat bottom boat and it had a 115 jet on it, no tunnel and went all over the place and never had a problem. That was before any forums or tunnels,
I now have a Woolridge with a small tunnel just big enough to smooth the water to the jet foot. With the jack plate I can fine tune the jet for the load and change out for a prop for lakes and ocean.


We had some of the early tunnels back in '93. The tunnels were too wide. The boat squatted too much. Never hit the foot of the jet. Destroyed the back of the boats. Had boat plugs on both sides of the tunnel. They were destroyed first. smile


Who is John Galt?
Re: Jet drive outboards [Re: DWC] #6946419
07/29/20 12:59 PM
07/29/20 12:59 PM
Joined: Dec 2010
Posts: 11,135
Armpit, ak
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Dirt Offline
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Armpit, ak
FYI That G3 probably has a the high transom and a short shaft jet. Pretty sure you will not be able to convert to a prop. The transom is too high for a short shaft prop. if you can find one.


Who is John Galt?
Re: Jet drive outboards [Re: DWC] #6946438
07/29/20 01:13 PM
07/29/20 01:13 PM
Joined: Jan 2011
Posts: 830
West coast of Iowa
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West coast of Iowa
Hovercraft grin
Dennis


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Re: Jet drive outboards [Re: DWC] #6946440
07/29/20 01:15 PM
07/29/20 01:15 PM
Joined: Apr 2011
Posts: 2,420
SE SD
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DWC Offline OP
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How long does it take u to switch out the jet to the prop?

Re: Jet drive outboards [Re: DWC] #6946511
07/29/20 02:12 PM
07/29/20 02:12 PM

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Oh Snap
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Oh Snap
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Couple of hours.
This is a early 90's tunnel on a Woolridge. Approximate size 16" wide X 12 inch taper.

[Linked Image]

Last edited by Oh Snap; 07/29/20 03:42 PM.
Re: Jet drive outboards [Re: DWC] #6946991
07/29/20 08:14 PM
07/29/20 08:14 PM
Joined: Jul 2007
Posts: 894
Arkansas
southerntrapper Offline
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Posts: 894
Arkansas
I have the g3 1548 vbw with a 40/28 Johnson jet runs good as long as you don't overload it . I've run this setup shallower than I should.


"We must all hang together, gentlemen...else, we shall most assuredly hang separately"
Re: Jet drive outboards [Re: DWC] #6947003
07/29/20 08:21 PM
07/29/20 08:21 PM
Joined: Mar 2014
Posts: 316
PA
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I am more than willing to sacrifice fuel efficiency for the ability to run through shallow water. I have a Yamaha 70 jet and a 30/40 Evinrude. As long as you don't back off the throttle you can run through very shallow water. Without a jet you simply can't get through a lot of areas on the Allegheny River. I can't imagine having trouble in a foot of water!

Re: Jet drive outboards [Re: southerntrapper] #6947218
07/29/20 10:33 PM
07/29/20 10:33 PM
Joined: Apr 2011
Posts: 2,420
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DWC Offline OP
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Originally Posted by southerntrapper
I have the g3 1548 vbw with a 40/28 Johnson jet runs good as long as you don't overload it . I've run this setup shallower than I should.


I have a catfishing buddy who is a pretty big dude. Once we get all our crap in the boat for an all nighter, will this thing move along ok?

Re: Jet drive outboards [Re: DWC] #6947241
07/29/20 10:56 PM
07/29/20 10:56 PM
Joined: Jul 2007
Posts: 894
Arkansas
southerntrapper Offline
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Posts: 894
Arkansas
How big a ole boy are ya?


"We must all hang together, gentlemen...else, we shall most assuredly hang separately"
Re: Jet drive outboards [Re: southerntrapper] #6947255
07/29/20 11:09 PM
07/29/20 11:09 PM
Joined: Jul 2007
Posts: 894
Arkansas
southerntrapper Offline
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Arkansas
The thing with jets is not only do you lose about a third of hp at the pump but they dont have the torque of a prop but for running shallow rocky rivers they are hard to beat just go as big as you can far as hp.


"We must all hang together, gentlemen...else, we shall most assuredly hang separately"
Re: Jet drive outboards [Re: DWC] #6947291
07/29/20 11:49 PM
07/29/20 11:49 PM
Joined: Apr 2011
Posts: 2,420
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DWC Offline OP
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Haha im not huge-225. My buddy has gastric bypass and is now around 280. When he was 440 he sat down a little quick one day in my old 16 footer and i did a back flip over the side into the river.

Re: Jet drive outboards [Re: DWC] #6947353
07/30/20 05:46 AM
07/30/20 05:46 AM
Joined: Jul 2007
Posts: 894
Arkansas
southerntrapper Offline
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Posts: 894
Arkansas
I'm around 250 and my dad is probably 220 it does pretty decent for us I would like to have a 60/40 or bigger, of course that means a bigger boat and that all means $$$$.


"We must all hang together, gentlemen...else, we shall most assuredly hang separately"
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