MaxCorvette

This part is a lot of work to get it right. I see you used the grain of the wood to your advantage [8D]. The nose section I used the grain in length orientation, gave me better control to get the nose right.
Keep the pics coming, this topic will be a nice guide for future builders.

Marcel

MaxCorvette

Don't want to hijack Harold's topic, so only a short message on the subject of kits.
There are 2 not completely finished kits at the moment, a tested and running 28" [720mm] MaxCatV2-S that has all formers and even wood for the hull, but no canopy yet, only the one I have.
And a non tested/build 57" MaxCatV2-L that has only ribs and stringers. I am going to build the first one this summer.
[link=http://www.rbckits.com/shop/index.php?act=viewProd&productId=389]MaxCatV2-S[/link] [link=http://www.rbckits.com/shop/index.php?act=viewProd&productId=393]MaxCatV2-L[/link]

The V1 Cat Harold is building I have running for 8 months now, so still fairly new. But seems to run better then first expected. 58mph at the moment.

Marcel

Andspeed

Hi
I tried to download the zip file, but it led me to an expired webpage. Is it still possible to get a copy of the plans for the MaxCatV1-L, please.

Thanks

build4less

For the kit, are the stringers in the MaxCatV2-L on one sheet of wood, meaning they are not cut in half and have to be pieced together? Where can I find a piece of 3mm or 4mm wood sheet that is at least 57 inches long? The longest piece that I can find was only 48 inches and would require me to piece the stringers together, which I do not want to do. Thanks.

KD0EM

I got the last two pieces of the bottom epoxy on this afternoon, just waiting for the epoxy to set so I can plane and sand to shape, then I will be finishing the back of the hull and starting the side sheeting.
Harold

FHHOBBIES

Sweet I am going to order the small, have any pics and video of that one? What brushless motor/lipo/hardware would be best for it? Thanks.

fuelman8

Harold

Can't wait to see it with the clamps off. [8D]

You must have had some spare time to work on it today

KD0EM

Bottom is done, planed sanded and shaped.
Harold

Dreamin Hemi

Looks like you were so excited you had a hard time keeping your hand steady taking the first 2 pictures! just kidding bro.
Very nice work so far, excellent craftsmanship. This has been a great thread. Keep the pictures coming, we all live for them!!!

KD0EM

Hi Dreamin, I had to retake the pictures, I had to use the flash. Thank you for the nice comments.
I have been whatching your thread of the 50" mono, you did a vary good job.
Harold

Dreamin Hemi

Thank YOU Harold, it's been a fun journey with the plug, molds, and finally pulling parts.
Again, keep up the good work on yours!! You may convince me to build one myself......great, now I have to make MORE molds! lol.
This cat could end up being as popular as the 48" mono hull many of us have built.

FHHOBBIES

Is there a link to the Mono?

dannyual777

I'm looking at the same issue with wood only 48" long. When I built my 48" wood mono, I needed 1/4" thick wood for the stringers. I only had 1/8" thick plywood so I epoxied 2 pieces together to make 1/4" thick wood for the stringers.

We can do the same thing for this 57" long cat. We can use 1/8" thick plywood (3mm) and glue it together to make stringers that are 1/4" (6mm) thick. We can cut the pieces to that the cuts are in different positions on each side so that we have a very strong, 57" long stringer made of glued together, thinner wood. It will work just as well!

dannyual777

build4less, if you look at page 1 of this thread, post #18 by MaxCorvette, he says that he used 4mm wood for the ribs and the stringers. Its his design but I think thats kinda thin on the stringer wood. I don't mind 4mm for the ribs but I think thats pretty risky for stringers on a boat of this size. I'm sticking with 1/4" (6mm) for the stringers.

I don't have any 4mm wood but if I order wood, I'll try to get some for the ribs. If not, then I can always epoxy a piece of 1/8" wood to 1/16" (1.5mm) and get a piece of 4.5mm thick wood for the ribs. MaxCorvette said that if you're not experienced, you might end up breaking some ribs if you were to use only 1/8" (3mm) wood. I'll decide later what thickness of wood I'm going to use.

BTW, my buddy already printed out the plans for me on a large plotter !

build4less

Thanks for the response. The thinnest piece of plywood that comes 4x8 at my local Home Depot is 3/16, so I will probably use that for the build. I might get that expensive hobby plywood (4mm) to do the ribs in though. I guess that I will just have to start building and go from there. KEEP UP THE GOOD WORK KDOEM!!!!!!!

dannyual777

Actually, the 3/16" wood is about 4.5mm. The expensive hobby wood that you're talking about is probably aircraft birch plywood. Very good stuff. I used Okoume plywood for my monohull build. It wasn't cheap but its an excellent marine plywood and it looks great under lightweight glass cloth and several coats of PPG Omni urethane clearcoat .

I'm going to go to my local Home Depot and see if they've got this 3/16" plywood that you're talking about.

dwr9

Danny, I think the 4mm would be plenty for the stringers. They are only 4mm in some places, but they are 3 layers of 4mm each in other places. It should be plenty strong and Marcel has been running his for a while now with no problems. If you can't get the 4mm that's another problem altogether. Doug

build4less

Where can you get 4mm ply that is at least 57 inched long?

MaxCorvette

Harold, you're doing great!

And for the length of the wood, here it is hard to get longer then 48" also. My V1 build has 2 sheets glued together, that worked great.
The V2-L kit has the stringer in 2 parts and when building the stringers [4layers of 3mm] it will work out fine since they overlap each other.
So the kit uses 3mm wood instead of the 4mm I used in my first build. This will still give a 12mm stringers, this is NOT a solid 12mm stringer but has overlapped parts, more like a sandwich construction.
Will be though enough no worries about that.

So for the ones that want to build the V1 themselfs 1/8 ply will do fine, but you have to be carefull not to break a rib before the small stringers on the end are in place.
And make the 4mm spaces in the large stringers 1/8" instead
This will give you a thinner center stringer, but you could make the middle stringer part double, then it is almost the right size again.
Or just use the 3/16" mentioned earlier.

For the sheeting of the hull I do recommend using 1/16" aircraft plywood for the bottom at least, this is very good quality wood and much tougher.
For the deck and maybe sides a softer and thicker [1/8] birch ply will work fine, is probably lighter then aircraft ply [wich is pretty heavy using the same thickness].

I have a video of the small cat in primer, but this was the 2nd run ever of my 6 year old son, so it does run better then this
Also it has a setup for him, so speed is secondary in this case.
[link=http://s247.photobucket.com/albums/gg137/MaxCorvette79/?action=view¤t=Max2deRun.flv]2nd run ever...[/link]

martno1fan

For those who cant get 1/16 plywood you could also consider a good quality hard balsa then glass over the hull this way you get strength and still keep it reasonably light too.As said though using shorter lengths of aircraft ply wouldnt be a problem,there are easy ways of joining them if yoiu have to just zap(super glue) a piece of ply to one end and use it as a lap joint job done.If as said the frames are thick enough just make the joint there just but two pieces up central on the frame couldnt be simpler.

thevirginian

Harold,
I admire your cat. She looks great. Beautiful lines, too. As soon as I am done with my hydroI am going to build this one next. Question: Wouldn't a 35cc be a better power source fora boat this size?

dannyual777

You're absolutely correct Doug. I guess I should've looked at my plans a little bit before I made the comment about 1/4" thick stringers. 3 layers of 4mm is way thick in places!

dannyual777

You already answered that when you said that you could get 3/16" plywood at Home Depot in a 4 X 8 sheet. 1"=25.4mm 3/16"=.187" .187 X 25.4=4.49 Therefore, your 3/16" plywood is just a hair thicker than the 4mm. Use it.

MaxCorvette

That would be great trying to squeeze a 35cc in this hull
I hardly could get a PUM260 to fit [more a height issue].
This hull has an overhang on the rear, but the sponson length is hardly longer then a PPB skater.
It's even narrower then most cats out there.

Maybe if I have saved enough I'll build a 1,6-1,8 meter twin in the future

Marcel

martno1fan

I think making it a tad wider wouldnt hurt performance much in fact it may help in rough water?.If i build one id maybe make it wider 15"or so.
Mart