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1652 G3, & 1756 Lowe tinnys
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777 Posts
Discussion Starter #1
I have a 1756 Lowe VT tinny. It has a manual Jackplate. Runs fine but I'd like to go skinnier.

Can I raise the engine even more if I add sponsons?
Can I raise the engine even more if I add a compression plate?
What if I add both?
Looking for answers from owners who have added one or both of these devices to their shallow water boat. thanks richg99
 

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Zephyr Cove is on FIRE!
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9,913 Posts
Yes and yes. I had Boyd’s Welding in Florida fab custom sponsons off plans I drew up and sent them and welded them on my hull and cut out a tunnel and fabbed that too. 1652 modified vee would run skinnier than it needed too. The pods will add stern lift and squeeze the water towards the prop and the compression plate will keep water around the prop, not cavitate and act as a big trim tab. You may also look at a Foreman heavy cupped three blade prop if you are serious. No sense in spending the money on just one mod, you need to do it right or you will not be happy in performance. Message me if you want to discuss more. This is firsthand experience, I did not hire a shop to design any of it and it all worked great. EdK fished off that boat a few times too. The transom mounted low water pickup is a Bob’s Machine Shop setup with a raw water filter I added to keep debris out of my motor. It was effective but I’d go with a Bob’s nosecone pickup if I did it again.
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1652 G3, & 1756 Lowe tinnys
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777 Posts
Discussion Starter #3
Nice work. From the pictures, it appears to me that you did not add a "tunnel" but rather a "notch" in your stern/transom area??? Is that so? The addition of the tunnel/notch is further than I think I want to go, but who knows? Would you mind sharing what it cost to do all of that? (notch and sponsons welded on)
thanks
 

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Forgotten Coaster
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2,365 Posts
Smackdaddy is a very experienced boater and rigger.

Another option would be to sell your Lowe as is and buy another metal (or glass) boat with tunnel/sponsons. There are a couple builders with that design. Might be more cost-effective in the long run.
 

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Zephyr Cove is on FIRE!
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9,913 Posts
Nice work. From the pictures, it appears to me that you did not add a "tunnel" but rather a "notch" in your stern/transom area??? Is that so? The addition of the tunnel/notch is further than I think I want to go, but who knows? Would you mind sharing what it cost to do all of that? (notch and sponsons welded on)
thanks
I did add a tunnel that was 2 3/4” tall and as wide as the area between the sponsons. I initially built this hull for an outboard jet but once I realized I needed a 115hp to run efficiently I just bought a jackplate and sold the 90/45 jet and bought a 90 with a prop lower unit and ran it for a couple of years. It wasn’t cheap but not as bad as if I had a shop fab it all. Sponsons were $460 including shipping from Florida to Texas, the aluminum for the tunnel was left over from the full hull modification. I had about $25k in that boat soup to nuts (new custom aluminum trailer too). All the little things add up, especially fasteners and fittings.
You can probably add a tunnel, hydraulic jackplate, sponsons and rigging for about $2k or so including welding labor. You’re probably better off selling yours and buying a hull with step pods and a tunnel.
 

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1999 Whipray, 2017 Tohatsu MFS50
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Yes and yes. I had Boyd’s Welding in Florida fab custom sponsons off plans I drew up and sent them and welded them on my hull and cut out a tunnel and fabbed that too. 1652 modified vee would run skinnier than it needed too. The pods will add stern lift and squeeze the water towards the prop and the compression plate will keep water around the prop, not cavitate and act as a big trim tab. You may also look at a Foreman heavy cupped three blade prop if you are serious. No sense in spending the money on just one mod, you need to do it right or you will not be happy in performance. Message me if you want to discuss more. This is firsthand experience, I did not hire a shop to design any of it and it all worked great. EdK fished off that boat a few times too. The transom mounted low water pickup is a Bob’s Machine Shop setup with a raw water filter I added to keep debris out of my motor. It was effective but I’d go with a Bob’s nosecone pickup if I did it again.
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Slightly off-topic, but if you follow Chittum on Insta or FB, they posted pictures today of a new Laguna Madre edition with a Yamaha 70 with dual transom mounted water pickups.
 

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Zephyr Cove is on FIRE!
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Slightly off-topic, but if you follow Chittum on Insta or FB, they posted pictures today of a new Laguna Madre edition with a Yamaha 70 with dual transom mounted water pickups.
No but I’ve seen them on a lot of boats. Jack Foreman’s old skiff has dual pickups on the tunnel with a 50 Yamaha. The problem is floating grass and small shell gets in the water pump and thermostat if you don’t use an in line filter and with the filter it will get full pretty quick and shut you down when you are running somewhere you don’t want to! Been there. They are great in clean water but as we all know most of the year there’s floating grass and all kinds of crap in the water. I’m going with a Bob’s nosecone on my Maverick HPX Tunnel/ Yamaha 70 2 smoker and I’ll put money down it will run where that Chittum will. It may not jump up where a Chittum with a Tohatsu 50 will because it’s swinging a smaller diameter prop and I’m running a 14”.
 

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Carpe Diem
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If you need sponsons, a custom tunnel, trim tabs, and a compression plate to run as shallow as you need, you'd probably do better to sell your hull and get one of these.

https://www.millersboating.com/2018-seaark-1872-mvt-inventory.htm?id=2177735&in-stock=1

Mine runs with the jack plate full up with no need for sponsons, trim tabs or a compression plate. On plane I draw about 6", maybe less depending on weight, water depth and bottom type.
 

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No but I’ve seen them on a lot of boats. Jack Foreman’s old skiff has dual pickups on the tunnel with a 50 Yamaha. The problem is floating grass and small shell gets in the water pump and thermostat if you don’t use an in line filter and with the filter it will get full pretty quick and shut you down when you are running somewhere you don’t want to! Been there. They are great in clean water but as we all know most of the year there’s floating grass and all kinds of crap in the water. I’m going with a Bob’s nosecone on my Maverick HPX Tunnel/ Yamaha 70 2 smoker and I’ll put money down it will run where that Chittum will. It may not jump up where a Chittum with a Tohatsu 50 will because it’s swinging a smaller diameter prop and I’m running a 14”.
https://bobsmachine.com/product/shallow-runner-nose-cone-kit-20-350-hp/

Is this what you're talking about? I'm intrigued and probably about to spend more of my kid's college money.
 

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Zephyr Cove is on FIRE!
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Yes I already bought the nosecone and kit, aluminum filler, zinc chromate primer, Yamaha paint, clear coat and I’m about to sand blast my lower unit and weld it on. Nothing will stop me but an oyster reef or stray duck blind after this! :D
I think I'm down for one as well. I'll be able to run on plane in my front yard on a wet day after this.
 

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You might check with Boatright marine. In 2001 I bought a Weld-craft 1854 with tunnel/sponsons and had Glen trick it out with hydraulic jack plate, rubber floor and poling platform. If Smackdady can do it, that sounds great too. I can’t say enough good things about my 16 yr old weld craft or working with Boatright. Back to your original question, my new Mosquito has sponsons, a foreman prop and now a Shaw Wing compression plate with no tunnel so we will see. Folks claim this set up will run quite skinny. If not, I’m going back to aluminum
 
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