Lengthened hull
 

Has anyone on here ever lengthened a hull before?

It has been done. Usually to make a mold, not run the boat. It would be a zillion times easier with 2 of the same hull so you didn't have to fab the extra length from scratch. But that would still be possible by pulling a mold off the hull either in front of or just aft of the cut point. Very large undertaking with good chance of you saying heck with this halfway through. What boat you starting with?

Sunsation did it, when they created the F4 from a Powerplay 38 remnant; which is NLA.

It's a 1988 GW Invader bravo 200SS. And my plan is to use this as a plug and make a mold from it.

Is there pictures of it I could look at or anything to read about it?

how much longer ? is there another model / brand that is that length already and would just need deck / cockpit mods ?
if you end up popping a mold for the part to cut and stretch the boat please photo document it and put up thread on here

i think this is the thread were the sides were cut off and changed and the boat was stretched (ive seen that thread / those pics on offshoreonly)
http://www.offshoreonly.com/forums/s...-pictures.html

[img]img 0264[/img][img]0260[/img]We took a 20 foot Bertram Center Console and stretched it to 22 feet just because we could and the customer wanted it.

So you want to turn a 20 gw invader into a mold to make 22 or 23 gw invaders? Are you making one for yourself, or planning on producing these? Aren't there enough 22 or 23 cuddy or bow riders out there? I know of a free 22 crownline in my marina in jersey. Just cuz it can be done doesn't mean it is a good idea...

Well obviously if I go through the trouble of making it longer and wider, I'm going to change the looks of it totally. I'll completely build my own deck and change the swim platform area as well.

Out safari that is exactly what I want to do. Take what I have and add my own style. Thanks for posting that.

where are you located ?
i say go for it if thats what you want to do, but
just as an example, if your wanting to cut up a boat and make a mold, as you said longer and wider, i would start off with a boat that was "that" already.
so w/ a 24 x 8 cuddy/ pocket cruiser

1. you have the beam
2. you have a high freeboard in which you could cut to achieve your desired profile (i think it's called the shear line)
3. if it's too long you can shorten it.
4. it would be cheaper and easier to buy big and cut down than to cut open to lengthen and widen
5. the bigger hull probably rides / performs o.k. as designed, the lengthened and widened one who knows unless your an astrophysicist
6. if your invader is a running boat you can take a break and hit the water.

like this one for 1500. to cut down and make / shape into your plug, Regal 1989 225 SC Sport Cuddy Mercruiser 5.7

i am not trying to discourage you at all, if you can't sleep at night because you want to build your "own" boat, build it and have something to be proud of

http://www.laniermarine.com/pre_owned_list.asp?sortsel=YH&GroupBy=&newused=U&T ypeID=73

I appreciate the input. This boat needs completely redone. Floor, stringers, and transom are gone completely. I have a couple other boats in use on a regular and I've always wanted to make my own. That'swhy I've thought about doing it to this one. I may say forget it and start from scratch. Don't know yet

I would agree that it is better to buy a bigger hull and cut it down. Either way is not that difficult with the correct planning and design. I built a saltwater flats boat by lengthening a 14' small runabout to 16' but the donor gull had great bottom design. It is fished constantly today by my friend that bought it in 2003. I built in 1995. I removed seven feet from the stern of my 35' Cigarette to make a 28' center console with an 8' beam. There is a thread on it in the Cigarette section. The hydrodynamics of a stretched hull may be a difficult design challenge. It is not something that you want to do by trial and error. It is very easy to make a one time mold, especially for a hull extension. You will need to be very careful to not build in in unintended rocker, and the bottom strakes will need to be adjusted also. The beauty of working in composites is how easy it is to alter surfaces. Let me know if I can help. Bob.

ren you have to post pics of the work that got you there, thats a nice job
http://www.offshoreonly.com/forums/f...onversion.html

i think there was another oso thread, someone else did this as well

Thanks Bob. I may message you for some advice if I decide to proceed with the project. You did an amazing job on your cigarette!

The pictures are on the thread in the Cigarette forum. Search 28' center console conversion. I am the only one crazy enough to do that so far!