97' Sylvan SE Center Toon Addition

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   Hey all

My father and I purchased a 1997 24ft long Sylvan pontoon two years ago. It gets most of it use up on Lake Geneva in Wisconsin which can be quite wavy, especially on the weekends. So this year we decided we were going to add a third pontoon for more flotation and a better ride. I figured I would post everything up in case it could help someone with their conversion in the future.

This is the best photo I have of the boat. Since then, We have redone the seats, electrical, outboard, lighting, added a staircase to the trailer and started revamping the playpen skin.

IMAG0021 by scott011422, on Flickr

And a mockup:
Untitled by scott011422, on Flickr

Had the Donor toon delivered from Great Lakes Skipper. Its a Bemmington 25.5ft oval toon.

Untitled by scott011422, on Flickr

Untitled by scott011422, on Flickr

This toon is off a canceled special order. You can order any 2 toon boat with optional 32" oval logs. However, being its for a 2 toon boat, no integrated transom. So I purchased myself a TIG welder and am teaching myself to TIG Weld. Going to make my own transom. Since I'll be cutting off the back of the toon, its a good time to add a larger fuel tank too. We will be removing the factory 26 gallon tank off the deck which then gives us more storage space, and mounting a 49 gallon in the toon. To get the most out of this tool i am designing the transom to be 100% sealed for maximum flotation. All said and done, this should add roughly 1400 pounds of flotation on a normal outing with a maximum of 4000lbs when fully loaded. Here are my current designs:

Untitled by scott011422, on Flickr

Untitled by scott011422, on Flickr

Untitled by scott011422, on Flickr

I will be using 3/16 Aluminum plate for the outer skin and 2"x 4" 1/4 wall tubing backing that up. I'll also have 3 1/4 thick plates that will be welded into the tubing and outer skin that will be welded onto the skin to help take up the stress from the outboard thrust.

Edited by Scott011422 - 05/16/2018 at 12:53pm

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Scott011422 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04/23/2018 Location: Sycamore Status: Offline Points: 4	Post Options Post Reply Quote Scott011422 Report Post Thanks(0) Quote Reply Topic: 97' Sylvan SE Center Toon Addition Posted: 04/23/2018 at 5:55pm
	Hey all My father and I purchased a 1997 24ft long Sylvan pontoon two years ago. It gets most of it use up on Lake Geneva in Wisconsin which can be quite wavy, especially on the weekends. So this year we decided we were going to add a third pontoon for more flotation and a better ride. I figured I would post everything up in case it could help someone with their conversion in the future. This is the best photo I have of the boat. Since then, We have redone the seats, electrical, outboard, lighting, added a staircase to the trailer and started revamping the playpen skin. IMAG0021 by scott011422, on Flickr And a mockup: Untitled by scott011422, on Flickr Had the Donor toon delivered from Great Lakes Skipper. Its a Bemmington 25.5ft oval toon. Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr This toon is off a canceled special order. You can order any 2 toon boat with optional 32" oval logs. However, being its for a 2 toon boat, no integrated transom. So I purchased myself a TIG welder and am teaching myself to TIG Weld. Going to make my own transom. Since I'll be cutting off the back of the toon, its a good time to add a larger fuel tank too. We will be removing the factory 26 gallon tank off the deck which then gives us more storage space, and mounting a 49 gallon in the toon. To get the most out of this tool i am designing the transom to be 100% sealed for maximum flotation. All said and done, this should add roughly 1400 pounds of flotation on a normal outing with a maximum of 4000lbs when fully loaded. Here are my current designs: Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr I will be using 3/16 Aluminum plate for the outer skin and 2"x 4" 1/4 wall tubing backing that up. I'll also have 3 1/4 thick plates that will be welded into the tubing and outer skin that will be welded onto the skin to help take up the stress from the outboard thrust. Edited by Scott011422 - 05/16/2018 at 12:53pm

curtiscapk Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01/30/2013 Location: OP KS \Truman Status: Offline Points: 959	Post Options Post Reply Quote curtiscapk Report Post Thanks(0) Quote Reply Posted: 04/23/2018 at 10:05pm
	can't wait to see this! Great stuff!
	Craig n Paula THE FLOATER Rebuild 94 Party Barge 24' 115 merc 22mph OP KS Truman Lake

gerard143 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07/20/2017 Location: NY Status: Offline Points: 53	Post Options Post Reply Quote gerard143 Report Post Thanks(0) Quote Reply Posted: 05/13/2018 at 4:56am
	ya excited to see where this goes.... keep us posted!

Bansil Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11/03/2016 Location: TN Status: Offline Points: 4	Post Options Post Reply Quote Bansil Report Post Thanks(0) Quote Reply Posted: 05/14/2018 at 8:56pm
	I guess I am #3 to this party

Scott011422 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04/23/2018 Location: Sycamore Status: Offline Points: 4	Post Options Post Reply Quote Scott011422 Report Post Thanks(0) Quote Reply Posted: 05/16/2018 at 12:48pm
	Enough of the Fuel tank mount is designed, material ordered. Going to weld a frame to the bottom of the tube. There will be a lip sticking down on the far side of the tank mount that will slide under the tank frame so I can slide the mount onto the frame and then either bolt or weld the aft section of the mount to the frame. Untitled by scott011422, on Flickr

Scott011422 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04/23/2018 Location: Sycamore Status: Offline Points: 4	Post Options Post Reply Quote Scott011422 Report Post Thanks(0) Quote Reply Posted: 11/14/2018 at 12:37pm
	So i finally got to work some on my toon. Was able to remove the engine and transom. Then slid the centertoon in for some mock ups before i cut her open. Some creative strapping and a chain hoist make easy work: Engine comes off by scott011422, on Flickr Engine comes off by scott011422, on Flickr Engine comes off by scott011422, on Flickr Engine comes off by scott011422, on Flickr This is about how far it will stick out: Engine comes off by scott011422, on Flickr

curtiscapk Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01/30/2013 Location: OP KS \Truman Status: Offline Points: 959	Post Options Post Reply Quote curtiscapk Report Post Thanks(0) Quote Reply Posted: 11/14/2018 at 9:37pm
	Nice where'd you get the tube?
	Craig n Paula THE FLOATER Rebuild 94 Party Barge 24' 115 merc 22mph OP KS Truman Lake

curtiscapk Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01/30/2013 Location: OP KS \Truman Status: Offline Points: 959	Post Options Post Reply Quote curtiscapk Report Post Thanks(0) Quote Reply Posted: 11/14/2018 at 9:38pm
	Never mind helps to look up!
	Craig n Paula THE FLOATER Rebuild 94 Party Barge 24' 115 merc 22mph OP KS Truman Lake

Scott011422 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04/23/2018 Location: Sycamore Status: Offline Points: 4	Post Options Post Reply Quote Scott011422 Report Post Thanks(0) Quote Reply Posted: 02/19/2019 at 4:11pm
	It has finally warmed up around here long enough to get some initial cutting done. After removing some of the factory brackets, we laid out lines every 10 degrees to measure back from to get our cut lines. Then shot a line laser from the side to make sure there were no glaring errors. Time to start cutting. Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr Untitled by scott011422, on Flickr Also mostly finished the fuel tank design: Untitled by scott011422, on Flickr

curtiscapk Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01/30/2013 Location: OP KS \Truman Status: Offline Points: 959	Post Options Post Reply Quote curtiscapk Report Post Thanks(0) Quote Reply Posted: 02/21/2019 at 9:07pm
	Nice!
	Craig n Paula THE FLOATER Rebuild 94 Party Barge 24' 115 merc 22mph OP KS Truman Lake