stretching a hull

Bill

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just for sunday night conversation sake.I know there is a local 31 BHM that was stretched to 36..Are there any others out there? Besides having the rudder a few feet foward of where it originally was and the boat being a bit worse in a following sea is there anything else that would make this a bad decision?

00505_6b37fuAiWqL_600x450.jpg

00505_6b37fuAiWqL_600x450 stretched.jpg
 

Toolate

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There was a thread a couple weeks ago about stretching a Sisu 22 or 26- cant find it though. Slow Sunday around here for sure.
 

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Old Mud

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samhop

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hi Bill
if you got the skills and there is a good reason jest do it.
i made my RP31 into a 34 it made a huge + dif on the way the boat rode. but that boat was not designed to be a 31 the plug was a 35 and i don't know if it was Dicky and Jean that shrunk it down to a 31 or some one else but the set up i had handled better after adding 34 inches.

if you decide to streach aft of the rudder jest make shure you keep the transom in the water. bring the water line and the botom plain back till thay meet than come back in a little to keep the transom wet.

you will have to change the flange and scuppers. if you have a wet exost out the transom you will have some limits, or you can run out the side or into bottom some. HPIM1005.jpg HPIM1051.jpg HPIM1009.jpg

HPIM1005.jpg

HPIM1051.jpg

HPIM1009.jpg
 

BillD

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just for sunday night conversation sake.I know there is a local 31 BHM that was stretched to 36..Are there any others out there? Besides having the rudder a few feet foward of where it originally was and the boat being a bit worse in a following sea is there anything else that would make this a bad decision?

WOW !!!!! :confused:
 

Keelboater

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"......is there anything else that would make this a bad decision?"

Well, maybe if they made a reality TV show out of it........ :rolleyes:
 

MASTERENEGADE

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I have good friend who took a 1954 lapstrake 34ft rybovich and turn it into a 50footer. Took him 12 yrs in his backyard. went from 454's to 692(550hp) detroits, made her wider higher and obviously longer. He did a gorgeous job, but myself and all of his friends all thought he was nuts..The boat rides beautifully and level. Most sportfishermans(viking, bertram, etc etc) throw alot of spray and squat a lil bit.
With his now 50' boat, he extended the keel along with the stretch and added lifting rails. This boat when doing 20plus knts rides extremely level. I'll see if I can find photos for the porn hunters here :)
 

MASTERENEGADE

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Here is the boat now. I know he has a whole album of the extension at home i'll see if i can get over there and snap pics of the photos.

barefoot.jpg
 

MASTERENEGADE

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Twelve years a boatless man? I am not sure I could do that.

trust me he was never boatless. He was smart and had lots of friends with boats, he went out more on a boat then then i think he does now lol
 

MASTERENEGADE

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I love when we raft up his and my boat. his wife always has a hot meal waiting for me, and nice cold a/c in the hot summer months :) Everytime i say i should go bigger i just tie up next to him and stay on his boat lol.
 

hmscapecod

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Bill, all the ships I have been on that were stretched went faster after the conversion. Froudes Law basically says you approach infinite speed as you approach infinite length. All boats should go faster as they are lengthened with the original beam and original hp.
 

Bill

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i think it can be done.. i spoke with the guy who did the 31-36 bhm stretch.. he re worked his keel,extended the shafts etc. He did it by cutting off the transom and building off of that instead of making 2 cuts..he said he gets calls here and there for guys wanting to stretch their boat but declines because the amount of work. however in my boats case where the centerline of the rudder shaft is about 15" from the transom and since the boat is already 50% there as it sits now with the washboards and deck up it may not be that bad.. def gonna think about it more.. would love to add 2-3 ft if I could..

photo 3 (22).JPG

photo 2(2).JPG
 

Bill

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hi Bill
if you got the skills and there is a good reason jest do it.
i made my RP31 into a 34 it made a huge + dif on the way the boat rode. but that boat was not designed to be a 31 the plug was a 35 and i don't know if it was Dicky and Jean that shrunk it down to a 31 or some one else but the set up i had handled better after adding 34 inches.

if you decide to streach aft of the rudder jest make shure you keep the transom in the water. bring the water line and the botom plain back till thay meet than come back in a little to keep the transom wet.

you will have to change the flange and scuppers. if you have a wet exost out the transom you will have some limits, or you can run out the side or into bottom some. "

nice job sam.. any more pics of that job? how far forward did you cut your stringers forward of the seam?
 

Keelboater

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Bill - I believe the Webbers Cove 29 was a stretched 26 footer. I was told that the 26 handled better, and the 29 had some issues in a following sea. Without any first hand experience with these boats I can't say for sure, but you may want to take a look at these two boats to see exactly what was done for ideas in your size range. Then again, it was the mold that was stretched, not the boat itself, so it might not buy you anything at all in the idea dept. But sometimes all it takes is one good idea to lead you down the path with a sawzall.......
 

MDI45

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Bill,My friend had a 34 Webbers that he stretched to 38....she ran much better and gained 2 kts.....also it was better for gill netting because the prop and rudder didn't get snagged
 

samhop

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bill
cut between the ruder post and transom make it strate i used i lazer to shoot it than a skill saw. make a cradle mold by taking 4 sheets of plywood stack by 2 and screw then but on the 4' edge, lay your transom centered on on the 4' seem washboard to the top 16' edge, mark, cut, notch every 6' on the flat 3' on the tern for 1.5x1.5 (split 2x4) about 2" longer than the stretch. you can see a pic of the mold frame on one of the pics i posted. unscrew the ply and jest run 2x4 bottom and sides square it up put the 1.5x1.5 in line it with something that will release i used plastic coated Masonite. you can jack the cradle mold up under the boat after you grind taper in the cut. i cut the stringers out in the transom and went 6" past the taper running forward. taper will depend on thickness of existing glass nice to get 2' of taper for every 1/8 thickness. glass scheduled also depends hull thickness but look for 2' laps with 4' to 6' on the cover.

if you have a place to do it its a simple project your looking at 2 weeks to get it ripped apart and the cradle mold built, and the prep grinding (get a real full face mask). 1 week to basic glass, 2 more for stringers, flange and washboards, and 2 more for deck scuppers you might as well do that clean-out tube now also. so your looking at 2 months of work one month of FUBAR.

I spent 9 months on mine jan. to sep. in a tent but i was fishing Sea Scollops on 2 full time boats in NB at the same time.
32" stretch, clean-out, 2 - 50gal fuel tanks, lifting rails, re-do steering, rudder stops, and probably some other stuff i can remember.

if your really going to do it, pm me your number i will talk to you about it. if this is jest BS dont wast my time
sam
 

CCtuna

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We have a jarvis newman 30 that was stretched to a 34 by wesmac at school. Other than it being poorly powered and propped it seems to ride decent. One thing that stands out is it turns on an absolute dime at cruising speed. Mind you the keel/rudder/wheel were not moved and are almost amidships.

The seats in the cockpit were the original transom.

WESMAC - 34' SPICUS custom finished by Wesmac: One of a Kind
 
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