Pursuit mono floodchamber build, first

[wakenshake]

I've been doing alot of surfing around on here and other sites gathering as much info as possible on planning for a flood chamber build(self righting). I have found the pursuit hull to hold about 10.5l of water(including hatch cover) and with my 3s2p setup have taped in place need just 2l of water weight to flip me back over instantly and quickly. Then i partially taped hatch area on fc side to see how far out 2l came to center.

Now I know i can get the boat to flip with water filling entire side boat but from what i read the front section never fills with water. Am i wasn't my time building wall all the way into the bow? If so then i must plan on making chamber bigger in back. Which i can do if i build batt tray and stand them up on side...

I followed Jan's fc build thread got two pains glass for wall layup then ordered west systems 207,105 with pumps,roller,cups,stick,gloves,brushes,fg strips for reinforcing seams on pursuit are badly taped, 6oz mat for inlay(not carbon messes with rx),peel-ply too! Thinking or laying in marine ply for stern as well. Hopefully I'm not forgetting any thing.

Only thing i can't find specific information on is what someone referred to as foam forming to build up the hatch opening fc extension to fc wall. I just planned on two flat pieces overlapped, no? All i know is wall will be heavy duty as the esc will be mounted to it and its just for bashing waves not racing. Which should help weight on left issue

So please any input good or bad will be greatly appreciated as I've been stalling on this build for awhile, I'm finally feed up with swimming after spartan so hopefully this build will help alot of others in same boat. As i plan on posting alot of pics and info because it was a tire sum task for me to search about battery setups,floodchambers,inlays,etc.

I just hope dont have to chang 2p setup is last resort as i have alot of 3s and 2s packs and everyone else i know that does land rc or own spartans use 2 to 3s and i want this to eventually be cheap a replacement hull for spartans owners.

Thanks everyone,Peace!

[785boats]

A lot of boats have holes drilled into the front of the flood chamber to allow the chamber to fill. They allow the air to escape as the chamber fills from the rear.
Here's a pic of my little yellow Ariane 2.
Other shapes work too.Anything to let the air out or the water in.

[fweasel]

Out of context, this is a very odd picture

[wakenshake]

thanks 785boats! so long as theres enough holes side and bottom up front it will flood. This is good to know cuz its tight on room in there,thanks!

whats odd. is this not the right way to check and see how much water weight it takes to flip over boat fweasel?

[srislash]

Seeing as though I own two of these(and love them)I best subscribe.

Shawn

[fweasel]

whats odd. is this not the right way to check and see how much water weight it takes to flip over boat fweasel?

Not odd on a boat forum. Anywhere else, its a toy boat, on a bathroom floor, with four water bottles taped to the bottom. That's odd.

[785boats]

thanks 785boats! so long as theres enough holes side and bottom up front it will flood. This is good to know cuz its tight on room in there,thanks!

whats odd. is this not the right way to check and see how much water weight it takes to flip over boat fweasel?

The holes are usually on the top & or the side. Not the bottom.
If that's the amount of water in those bottles that is needed to flip the boat, then the chamber needs to be able to hold that amount of water.
But don't forget, the batteries & esc are usually installed over to the side where the flood chamber is too. So that will make a diference to how much water you need.
Everything should be held in place before testing for the water weight/volume.
Here's another layout for holes in the deck & side.

[wakenshake]

What's odd is what I was doing while I took the photo......

I meant top, I've had it upside down all day and got confused,heck first bottle taped wrong side,lol. But yes each bottle is half liter so three bottles and it was at 45 degree angle one more and it instantly plops over with no hesitation. That's with components payed out taped and foam in place with hatch sealed tight. If you look at third photo you'll see tape across maybe 20 sum percent of hatch opening and if I put boat on its side and fill to top of tape if was three liters. Half way up tape about inch over from hatch lip was two liters poured into bare hull using kitchen measuring cup. Which is about right considering I read it takes about 25 percent of hull volume to flip since total is about ten liters.
Anybody on foam forming fiberglass form the layup to connect side fc wall with hatch lid?

[wakenshake]

Oh 785 that hole is huge looking in photo, is that your boat? I would think if I pierced a wave or did a sub dive it would drag to the port a lot more than bunch little holes. But it'll def get job done.
I just thought idea to make two flat fg wall for chamber and just over lap and when I do corner edge placeit a carbon rod to make a nice rolled edge. If I google foam form it's just shaping foam and covering it with plastic before laying up. I think I can get around by just doing this and it'll be stronger too. Heck I'll even put a carbon rod on bottom rc wall seam as well. I'll post a mock up pic of everything tonight and if no one objects I'll start sanding soon.

[wakenshake]

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[wakenshake]

first two photos are of my preferred layout third is if i was to install a batt tray ova tube which presents its own pros and cons in this already tight layout. There just a cardboard cut out, im then transferring that to a tighter fitting balsa wood plank cuz cardboard kinda flimsy. Ill use that template as the trace out for fg wall i build, proly tomorrow. wait no i gotta do test batch on epoxy been sitting in basement for couple months, and its 24hr so maybe monday ill start layup of wall.

[785boats]

Oh 785 that hole is huge looking in photo, is that your boat?

No it's not my boat. Just a pic off the web to show you what's done in some race boats.
The only pic of one of my boats is the very first pic I posted of the Ariane 2.

But here's a couple more pics from Jans site.
This is what is meant by using foam. When it has to encroach into the actual hatch space, a piece of polystyrene foam is shaped & glued in. The fiberglass is layed over the foam from the hatch lip to the floor of the hull.
then the foam is dug out & disolved out with acetone through the hole in the transom.

Just to give you an idea, the hull is a 31" Arowana, & that flood chamber holds 2.5 liters of water & Jan still needed to add weights to make it roll over properly..

[martin]

It will surprise you how large a volume the chamber needs to be & how much the chamber wall needs to come over towards the centre of the hull on a 32" hull.

[wakenshake]

oh wow thats crazy kool concept using acetone to remove foam, but layign up in boat will present a problem to run full lentgh fc wall and might not get as much fg to epoxy ratio for good strentgh unless i can get peelply up in bow. But doing it this way for at least top fc wall will allow me to use shape other than flat , which will gain me a little more volume and i can still use prefabed wall for upright wall.

Can someone suggest place to buy epoxy board for strengthening the stern as i read a comment about asking hk not to put wood in transom anymore, idk why but there must be something to it. I was gonna use cf plate but again it might mess with tx rx. I still got layin,wall seams and fc to do so im not in hugh hurry but ill need it sooner than later.

first photo was inside the bow look along seams how badly there fg is lay in there. Second is how the stern is in need of tlc as well. but hey what do you want for a 99 dollar hull. Maybe i woulda been better off getting a higher end hull needed less intial tlc. too late now! lol

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[Peter A]

Didn't the new Pursuit come with a flood chamber? I remember pics of it being posted some time back.