My concern is with the lifespan of that joint. Composite materials don't have the ductile properties of something like steel they are more effected by the cumulative effects of stress. I'm not a naval architect but I feel you should add some kind of a stiffener to tie the 3 parts of the boat together while lessening the effects of wave action and loading of the boat.
@EvenNinegamingКүн бұрын
It might also be a good idea to put a few layers of fresh fiberglass mat over the joint aswell just to ensure the repair remains water tight.
@EvenNinegamingКүн бұрын
Additionally, I worry about the thought that this modification may be stronger than the original design. Well, I agree you ha e done some good math on this. You have to remember that no joint will ever be as strong as a whole piece of a material. Fiberglass being a composite does help a lot in this case, but even then, you are relying on the epoxy across the entire joint and not the individual fibers of fiberglass. The fibers give fiber glass its strength, that's the other reason I feel you should look at limiting torqe applied to that joint.
@drfranckyКүн бұрын
You are testing stretching (tension force) of the material but what you really need to test is bending. Bending is much more complex because it involves both tension and compression forces all together. The force required to break the plank in tension is not the same as the force required to break it when bent.
@tehpanda64Күн бұрын
If you want to make your 40 foot house boat 50 feet long I'd start by looking at how a 50 foot boat is made and see where the additional strength is coming from. And Alternatively talk to a 50 foot boat manufacturer to see what they recommend and why. I didn't pay attention to your actual lengths I was just giving examples.
@dfabeagle718Күн бұрын
WOW not what I was expecting when I clicked... to be honest, I'm not sure what I was expecting. :) Great video though, so I figured I would feed the algorithm. I think I'll go on and subscribe too. I had a place at Texans next to the VFW, miss it badly. Oh, sorry about the AI Dirtbag scam (more expletives deleted) situation. That hurts. Good on you for testing and mathing it out!
@pappydoc69Күн бұрын
I have been reading the comments I have lofted 100s of boats in my years of boat building all you need to do is repair the glass as you stated tie into your stringers and we're you join the hulls put bulkhead .
@Sidelinechatswithrobandtim2 күн бұрын
KZfaq algorithm did its job love this project and enjoyed your latest video keep up the great work
@Factory928AC3 күн бұрын
Yo this $#!+ was 🔥!!!! I’m saving this video 👌🏽
@mattmcgellin66073 күн бұрын
The algorithm bought me here, but Im an actual naval architect lol. Admire the hard work and dedication to testing but a few of your assumptions are a ways off w.r.t the calculation of stresses in the hull. Not that itll matter im sure if you just want to cruise around the lake.
@Motiv8Labs2 күн бұрын
Thanks for the feedback. If you or any NA you know ever wants to give any of the data a second look we’d love to have it! As right now the only thing I’ve got are two reports from these “freelance NAs” and the testing I’ve done.
@mattmcgellin66072 күн бұрын
@@Motiv8Labs if you send some basic drawings or measurements I can do some quick hand calcs that shouldn't take more than an hour or so lol. What I need is: - Basic arrangement including locations and weight estimates of all equipment/hull - midship section, showing glass thickness, location/dimensions of longitudinals. This should be the hull only, not including the superstructure unless it's very well attached (moulded) into the hull. This will give you a, hopefully correct, global hogging and sagging stress... But remember that on small craft local stresses are often a lot higher. Things like wave slamming can cause cracking which over time will create big problems.
@timeobserver82203 күн бұрын
You used a freelance website then are surprised why this outcome? lol
@ncikb20934 күн бұрын
Did you actually expect a proper answer from an online "expert"?
@watsisbuttndo8294 күн бұрын
Mr Pink was using KSI, not PSI. Not that it adds any to his credibility
@Waveluth5 күн бұрын
About 36 years ago I did a similar thing changing my 36’ cabin cruiser to a 44’ cruiser. I found that using the same math that I used when figuring out cantilevers in construction. It was a successful project and to my knowledge the boat is still going strong. I haven’t owned it for 20 years but it’s moored a half mile from my house in the southern shores of Massachusetts. I used 8 layers of West System with alternating layers of a very particular fabric ( cheap polyester fabric)instead of fiberglass mats. (Inside) and on the outside it was faired out with 6 layers of Mat fiberglass and then 2 finish coats and two additional layers of fiberglass roll over the ENTIRE HULL. After skarfing the joints, router out a 1/4”-3/8” of the hull and lay solid mats into the route. After they are at the same profile you can then start the West System and layers of fabric in and out. Why CHEAP polyester?? Because the West System essentially melts into the fabric and makes a surface SO UNBELIEVABLE STRONG it will shock you. I got the idea from a book written about building with West System and plywood. I hope it works for you. It worked for me. Good luck!! 👍🇺🇸
@Motiv8Labs2 күн бұрын
This is awesome! Thanks for sharing that story, because it’s tough to find many examples of people doing heavy modifications like this.
@KhristianGillespie5 күн бұрын
I want to do open road race as well nice done with the run!
@Motiv8Labs2 күн бұрын
Thank you! It was a blast for sure.
@WattzTrappN6 күн бұрын
Did it make it to the lake🔥
@Motiv8Labs6 күн бұрын
Got an update video coming out soon! We failed of course.
@winningwithoutracing78117 күн бұрын
The biggest liability with extending a boat as you are isn't the addition strain that you're imparting on the joints but rather the additional stresses imparted on the vessel as a whole. Being that you're only adding a small bit and its a lake boat I'm fairly confident you'll be fine. I've long dreamed of stitching two smaller boats together to build a massive stepped hull 30+ foot vessel on the cheap. Provided the two hulls could be allowed to flex somewhat independently I suspect that the vessel would wind up weighing significantly less than similarly sized conventional hulls. The weight of boats goes up almost exponentially with length because addition length puts much greater moment loads on the hull as a whole.
@Motiv8Labs6 күн бұрын
Awesome, thank you for the feedback!
@winningwithoutracing78117 күн бұрын
I'm one minute in to the video and already confidant that you're extension will perform admirably. In actually taking the time to make sample coupons and evaluate the physical realities of what you're trying to accomplish a successful outcome is damn near guaranteed. I'm a degree mechanical engineer who passed his EIT and I can tell you with confidence that 95% of those that I graduated with (back when the degree programs were significantly more robust) have little interest or aptitude in the physical realities of what you're undertaking.
@DoRullings8 күн бұрын
I think you can easily make the joints strong enough. What I might have worried about is that the hull will now be almost 20% longer than it was designed for and that will both increase and change the load on the entire hull. Note: I am by no means a boat designer, just a guy who grew up by a fjord in Norway and has therefore been at sea a lot.
@Motiv8Labs8 күн бұрын
Definitely a good point. Nautaline had a longer version of this houseboat that was a 48’, so I think we are still in the ballpark for what might be normal on this type of design. We will see though!
@scotthogan45588 күн бұрын
Call the guy who made the flex seal commercial he cut a boat in half and was on the water all day with no leaks. I trust him more than any architect or engineer.
@Motiv8Labs8 күн бұрын
I’d definitely trust the boat if we flex sealed it together. Would probably need a loan to buy enough of it though.
@martinmiddleton62588 күн бұрын
Great series. Good tip on the primer tool, on GM inline engines. (Maybe others) However, GM V- engines use a groove in the distributor to cross the oil to the left side. One can be made from an old distributor or purchase a quality purpose made tool. Some Amazon comments mention some cheap ones don’t work.
@Motiv8Labs8 күн бұрын
That’s exactly what a buddies father had, a cut apart distributor to use as an oil priming tool. Never would have known about that if he didn’t show us.
@martinmiddleton62587 күн бұрын
@@Motiv8Labs I have an 84 VIP my dad bought new. I went with him to Vivian to pick it up from the factory. Most likely going to have to do the same as you to get her seaworthy.
@peterpapadimitriou77449 күн бұрын
Watching you down under- Great ideas for all of us on a boat budject no dought! Great to try a few possible remedies before spashing money on other possibilities- as we say in Australia - BOAT= Break out another thousand!
@Motiv8Labs8 күн бұрын
Thanks for the feedback! Hopefully us doing it wrong will help some people out.
@mtw12349 күн бұрын
Don't take a houeboat out into open water, they are for lakes or intracoastal waterway cruises.....also install all new stringer bow to stern gunnel to gunnel. Good luck, can't wait to take thís project on with yoú.😅
@Motiv8Labs8 күн бұрын
The intracoastal might be fun one day, but for now we will be lake bound once this thing is done. Unless one of us win the lottery. Thanks for the feedback!
@bimodo14729 күн бұрын
Old boats are fun, if you like this kind of sh** 😂 I restored a 16‘ 1972 Winner Wildcat over the winter and we tried it out in Croatia. Big fun and we only broke down once (steering helm came loose on the z drive) but were able to limp back on our own. Now I have an issue that the engine dies at idle but runs fine at higher rpms, probably a vacuum problem - lets see… Keep on going and tell us about the jet boat!
@Motiv8Labs8 күн бұрын
I just looked up what a Winner Wildcat is. That’s a fun looking boat! I’ve been there with the boat not wanting to idle right, which makes coming back into the marina always fun. Thanks for the feedback!
@manfredfritz60689 күн бұрын
Love the boat, you'll get her going!!!!!
@Motiv8Labs8 күн бұрын
Thanks man I’m trying!
@mikecrawford73529 күн бұрын
I always wanted to put a ugh horn on my boat when I had one. About 10 years ago I sold a 1978 crestliner 15’ trihual I owned it for 2 years. 3 separate trips I had issues with it. I had battery issues, clogged fuel filters, and a fuel tank that wouldn’t prime.
@Motiv8Labs8 күн бұрын
Sounds about right. The fuel tank not priming is the same for me, if the fuel lines are empty sometimes have to get it running off starting fluid before it will draw fuel all the way through.
@mikecrawford73528 күн бұрын
@@Motiv8Labs all 3 times I was able to self rescue without needing to row. There were a few boats around that we probably could have waved down for a tow. One time I was in the middle of the lake first and only time going to this lake. It was 14.5 sq miles 39’ max depth makes for warm water and tall grasses. Any way we had been driving around letting the kids drive in the middle we broke down. While trying to figure it out and just after getting the kids and dog back aboard. No wind to speak of no boats anywhere the water was like glass, we got hit by a single wave about 2 foot high broad side. It came back rom the other direction as we got it fired up. I swear we saw that same wave 3 or 4 times after that.
@jenniferreeves71299 күн бұрын
Heyyy Kyle! TowBoat on Texoma is awesome - I should know 🤣 #projecthouseboat You'll get it!
@Motiv8Labs8 күн бұрын
First time dealing with them. They definitely were awesome. It’s probably time I finally get a membership. Hope you are doing good!!
@michelplourde98319 күн бұрын
Not a naval expert but the way we repair smc and fiberglass in structural autobody repair you need to bevel boat side of the fiberglass and fill with new fiber mat and resin by only patch one side you still have a breaking point at the joint. If you bevel both side it's almost impossible to broke at the repair area.
@Motiv8Labs8 күн бұрын
I’m glad to hear that. In some of our other videos I was talking about doing a double sided scarf joint, just like you mention. This is the plan, I’ll bevel back on both sides of the boat. Thanks for the input!
@RalphTempleton-vr6xs9 күн бұрын
I got into boats back in the mid-80s. There wasn't any old wreck I couldn't see the potential in, and I was willing to put in the work. Woodcraft, fiberglass, becoming a half-ass marine mechanic of necessity, and enjoying varying levels of success. From 15' to 23', I did it all. Built a couple from scratch using my designs, and others. Speedboats, and I'm talking 100+mph, and jonboats too. Enjoyed it, mostly, but then I got old, and it ceased to be fun! I just finished what will probably be my last boat, a 15' runabout with a 1971 seahorse. It'll do me just fine. Enjoy the journey, boys. The memories, and the mistakes, will last a lifetime
@Motiv8Labs8 күн бұрын
That is awesome! We are enjoying it over the years no matter what happens. Like you said will be good to have these memories one day. Glad you got another one built, it’s not an easy task that’s for sure!
@bobbyjefferson529210 күн бұрын
Hopefully your answer this question just curious is that just regular plywood because I noticed I think in your string as I seen plugs
@Motiv8Labs8 күн бұрын
It’s exterior rated plywood so it’s built with waterproof adhesive. It’s about as good as you can do before the jump to true marine grade plywood.
@bobbyjefferson52926 күн бұрын
Thank you
@seawench55510 күн бұрын
Puppy is gorgeous, please put a lifevest on her 🇦🇺🐶
@Motiv8Labs8 күн бұрын
Yessir we have one for her that you could see in a couple of the shots. Need to keep it on her more of the time though especially in that little boat.
@kenj715310 күн бұрын
order some quality parts this time! and at least act like you know what you are doing!
@Motiv8Labs8 күн бұрын
I’ll make an attempt
@pureroundcircle10 күн бұрын
I didnt read through all the comments so maybe you answered what was wrong, but as a 3L mercruiser owner and someone who has dealt with the pertronix and coils and such on these. Take a gander at the OHM rating of the coil and verify it is correct for your ignition system. IF you get it wrong the coil it can get hot, burn up the pertonix etc. and have issues very similar to what you were having. Another one to look for is the ignition/starter contactor on my boat it had a bypass and also a resistor circuit. While cranking it was in bypass and providing full 12v to the ignition, and while running it went through a resistor and reduced the voltage to the ignition. Took a bit to diagnose that my bypass was open and the boat wouldn't fire while cranking but would sometimes fire just as you let off the switch and would start.
@Motiv8Labs8 күн бұрын
You are right on with that. The coil was the 3 ohm version with the built in internal resistance meant for that module without a ballast resistor required. They are both 10+ years old and from another engine, and the vibration of that engine might have killed it. I see they have an epoxy filled coil for marine and harsh vibration use, so that’s what I was going to buy next. Glad I’m not the only one that’s dealt with this before!
@TheStephenspann2710 күн бұрын
I may have mentioned it in a comment in another video, but I carry a 6hp outboard in my ski locker just in case I need it to get back to the ramp. I’m like you, I don’t want to ruin someone’s day and have them tow me back.
@Motiv8Labs10 күн бұрын
That is such a good idea man! I have those two 4 HP outboards from the micro jetboat, so I could probably rig something up to mount one of them to the swim ladder when needed. Might only go 3 mph and take 2 hours to get home but better than the $350 tow bill I paid.
@dontdiecurious10 күн бұрын
So you sandwiched ply to get that length?
@Motiv8Labs8 күн бұрын
Yessir that’s how a lot of these stringers get built. In the houseboat we are restoring the main stringer is 40’ long of sandwiched marine plywood.
@grahammedlock309410 күн бұрын
I like how positive the captain of the tow boat was. Super cool.
@Motiv8Labs8 күн бұрын
Same here, they were awesome!
@Smokkedandslammed11 күн бұрын
Just a couple more projects to finish before I can start working on my 82' Boston Whaler Revenge V-20 again. I want to clean her up and update her sooo bad. I've been working my ASS off for the last couple years and now I just want to chill on the bayou hahaha Gotta put in more work before that though 👍🏻👍🏻
@Motiv8Labs11 күн бұрын
That’s awesome. Yeah little at a time and one day it will be done. At least that’s what I keep telling ourselves about our projects around here.
@murraymadness467411 күн бұрын
Cutting thick stainless is a major task. I made a water cooled exhaust for a twin turbo rotary using some heavy ss plate and man that was painful. I still don't get how the 02 sensor can work with a cooled exhaust, it must be hot to work, still trying to figure out how to do mine (not using the rotary now using a 3.8 ford v6) For my boat its a family boat, but for yours I'd just run over the back headers no water cooling, it is WAY easier, and if nobody is sitting back there or climbing into the water just a couple guys in front, you should be good! and it sounds awesome with open headers.
@Motiv8Labs11 күн бұрын
The big marine exhaust manufacturers seem to have their build in O2 sensors in this area so I’m guessing it’s close enough to the engine that the exhaust temp is still hot enough. Might be interesting to put a pyrometer on it and see what the actual temps end up being, we’ll try and do that.
@JonFJ120011 күн бұрын
I traded for a tri hull in 1987 and totally restored it, however the Volvo Penta straight six with triple carbs needed no work. Last weekend on the Columbia River in Vancouver Washington after six hours of family fun my boat died and had to be towed….first time since restoration. A wire slipped its connection on the ignition condenser, 10 second fix
@Motiv8Labs11 күн бұрын
It’s crazy how a lot of times it’s some simple tiny cheapo part that takes the whole boat out. Jealous that you have a good navigable river like that one!
@goldenliver02311 күн бұрын
Hey how is the Amazon eva flooring holding up after a year?
@Motiv8Labs11 күн бұрын
It’s perfect on the boat, since it’s been in covered storage most of the time. But the better test is on the micro jet boat it’s been outside in the sun uncovered since last year. It faded just a tiny bit but still looks great. I guess they put some half decent UV protectant chemicals in that cheapo flooring.
@martinmiddleton62588 күн бұрын
My friend put Amazon EVA in his Bayliner. After a year, it would turn your feet, or whatever you touched it with, blue.
@Carhazy11 күн бұрын
Such a great storyteller! I had a similar experience with a pull cord. Looking forward to an update on the jet boat.
@Motiv8Labs11 күн бұрын
Thanks! Breaking down from a pull cord issue sounds rough, probably something that no one ever keeps a spare of either?
@mikecrawford73529 күн бұрын
I kept a pull cord for my electric start 2 stroke evinrude 75. I also had to use it a time or two. I love the back up option
@Carhazy9 күн бұрын
@@mikecrawford7352 If I had of realised my new aftermarket fuel line wasn’t quite aligned with the ball valve release, I probably wouldn’t have abused the pull cord in anger at the thing defying my order to start!
@goldenliver02312 күн бұрын
What brand of epoxy are you using? Im trying to figure out what epoxy resin to buy. Thanks
@Motiv8Labs11 күн бұрын
Bought it in bulk from USComposites online. There might be cheaper or better places, but I haven’t found any yet.
@lectro8812 күн бұрын
Man it sucks to be broke down anywhere, but especially the water, and Worse yet the Ocean. I am going old school too, because I am leery of the 4 strokes that you need a lap top and program to add fuel and oil. I also have a 70's something year Pisces TriHull 15' that I started a resto on but got a 69 Mako dream or nightmare that took over my spare time. Like 5 years now, but I did shatter a ankle so I call medical leave for 2 years. lol. Good luck. comment # 5 and 300 th view.
@Motiv8Labs11 күн бұрын
Old school is nice for troubleshooting and fixing, only a few wires and parts, so I do like that. There is something nice about the fuel injection that just starts right up every single time whether it’s hot or cold. They both have their pros I guess! Good luck with yours.
@FreezyAbitKT7A12 күн бұрын
We scrapped a tri-hull. Best thing ever we ever did. Terrible in rough water. They were designed for those ding-dongs that try to stand up in a kayak and cast for fish. Because they identify PFDs as violating their rights and unmanly, often times they take a permanent nap .
@Motiv8Labs11 күн бұрын
Yeah only benefit is the tri-hull is pretty stable when sitting still, which it seems to be doing a lot lately.
@binjimmyly342312 күн бұрын
Thanks for posting, your vids helped me along my rebuild and kept me motivated. -Jimmy from Canada
@Motiv8Labs11 күн бұрын
Thank you sir!
@dougmasters387512 күн бұрын
I feel ya!! The Mini konked out last Sunday on a drive, apparently the alternator had died and it ran until the battery was too dead to run. There probably should have been an idiot light to tell me, but there wasn't... $600 tow back to my house.
@Motiv8Labs11 күн бұрын
$600!?!! We are in the wrong business.
@oldseabee293812 күн бұрын
You know, if it wasnt an old project boat, it wouldnt be an adventure. I'm on the 4th engine in my 1971 Land'N sea. Finally broke down and got a more modern fuel injected 454. Just posted a video of me installing it. Looking forward to seeing what went wrong with yours. lol
@Motiv8Labs11 күн бұрын
That’s awesome! There’s nothing like new fuel injection on the water, just turn the key and it starts whether it’s 110 degrees outside or 50 degrees. The old carbed engine just can’t quite pull that off.
@nancydwyer458312 күн бұрын
Nancy's guy Frank here.... when I was in college, back in the late 60's, a fellow I knew bought one of the King Midgets new (he said it was the only thing he could afford), and he drove it to the college every day. One morning I was driving into town to get to school on the "interstate" AND believe it or not... I saw him pull onto the road just ahead of me. I recognized his car right away... how could I miss it... anyway I pulled in behind him and followed him into town. He said it had 12 HP... I think his model was a '66 or '67. I was surprised that he could get that little car up to 55 miles an hour... just barely mind you. He had told me it would run 55 but I didn't believe him until I followed him that morning. He always had the canvas top up, with doors and windows too (he said better MPG and less wind resistance). It had a radio also, and he seemed to be able to always find a parking spot.
@Motiv8Labs11 күн бұрын
I can’t imagine driving that car on any highways or freeways nowadays or even back then with big 1960s cars on the streets! It’s awesome that you actually knew someone with one.
@user-nb3bi7fo5x14 күн бұрын
With all of your testing and math, I retract my comment that I won't go on the maiden voyage of the rebuild......I absolutely want an invite now!
@ps3dropzone18717 күн бұрын
I would literally run me to I beams in the subfloor on the bottom of the hull I would do your 20 degree bevels fiberglass all that and then fiberglass the i-beams to the floor as much as you can and that should give you a lot of support you know Brian down into the stuff for a little bit when are you fiberglass your I beam send
@doublem602718 күн бұрын
What oil did you guys end up using on this ol ski
@Motiv8Labs17 күн бұрын
I still just run Quicksilver brand two stroke oil or sometimes even knockoff Walmart brand two stroke PWC oil. I know a lot of old Seadoo guys are die hard Seadoo brand oil only but any rando PWC two stroke oil has always worked ok for us.
@mazdarx788719 күн бұрын
But If you want info with numbers , contact Mads on Sail Life , He'll point you engineers he knows. Also Andy on Boatworks Today is very good