Jet Boat build thread..

BRUMBERTY · Post by **BRUMBERTY** » Sun Apr 05, 2009 12:29 pm

Low profile alloy exhaust header

From the rear..

First mate of Mayhem

Got the bends from here..thanks Mr Fuji, free too.

He is amusing..and hard to wash

Grinding out some flow and horsepower

BRUMBERTY · Post by **BRUMBERTY** » Sun Apr 05, 2009 12:53 pm

100 HP of fury...I hope

Delivery of custom bends

Gannon · Post by **Gannon** » Sun Apr 05, 2009 1:27 pm

Looks great. And it looks like your little helper is learning from an early age

But i have a small query,.. will the alloy headers be enough to handle the heat?
I know that the heads are made of the same material, but they are watercooled. Where are you gonna inject the water into the exhaust manifold?

BRUMBERTY · Post by **BRUMBERTY** » Sun Apr 05, 2009 3:34 pm

I am heat shielding them with a race wrap and injecting water 450mm away from the end of the headers..

AlpineRaven · Post by **AlpineRaven** » Sun Apr 05, 2009 4:23 pm

looking good there...
that little helper will be good with hands in the future just like his father
Cheers
AP

phillatdarwin · Post by **phillatdarwin** » Wed Jun 17, 2009 11:53 am

get a heat exchanger/coolant circuit out of a old truck and put a header tank on to it just a rad in a car and u will be abell to run coolant in it .and make up some s/steel headers for it and put the water out of heat exchanger threw it as with the alloy headers u have in there now thay will melt as u no alloy melts at about 570deg c and wil not last long at hi RPM

phillatdarwin · Post by **phillatdarwin** » Wed Jun 17, 2009 12:04 pm

BRUMBERTY wrote:I am trying to keep this boat as simple as possible.
Less to go wrong on the water or simple repairs if it does.

I am OVER niggling small issues with boats when everything needs to work all the time.

As I figure it, and please pipe up anyone who has an opinon, (Brett, SWK,)
The only steel in the cooling system is in the water pump, all the rest of the passages are alloy casting.

I have found two spots to put zinc annodes into the system and a spot to have a flush valve.

How much could it corrode really?
I may put a WD40 injection nozzle for after flushing.

as the block is not a alloy it will corrode out very fast just put a header tank on it like i said and it will last for ever .

phillatdarwin · Post by **phillatdarwin** » Wed Jun 17, 2009 3:27 pm

i was thinking if u mid mount the engine and put a pod out the back for the jet to be mantled and real controls and it wood be good fun

phillatdarwin · Post by **phillatdarwin** » Wed Jun 17, 2009 3:38 pm

Run new stringers fore and aft every 300mm for rigidity.
for this just run 3mmx50mm flat
and with the ribs just fit in the corners at 45deg and u will make it stiff .
as if u put to much weld on to it u will find it will just crack up all over the place .
mount your engine with some 6mmx50mmx50mm angle but weld just to the ribs and just cross brace it with 6mm flat and u will have a very strong mount that will not flex and crack .
do not weld to the floor plate as it is a wast of time and money on alloy.

BRUMBERTY · Post by **BRUMBERTY** » Sun Apr 11, 2010 1:09 pm

Still trying to weld this horrid metal.
Built a transom box and the ribs required, I even got a few welded in.
I blew a lot of holes too.

Got a metal fabricator just moved in across the road, he is finishing the welding for me.

Got some AWESOME poly pipe for the pontoons.

Three lengths of 160mm diametre and four of 110mm.
5 to 6m lengths.

The wall is 12mm thick and looks indestructable.
UV stable, black, weldable, FREEEEEEEEEEEEEEEEEE!

Absolutely 'ken stoked.

I am encasing the hull around the gunwails with a full 160mm tube and filling it with boyancy foam.

I will post some pics when I find the camera.

WOO HOO.

The near zero budget build is amazing how is falls together when you wait long enough.

But I am not a patient person......Peace everyone.

BRUMBERTY · Post by **BRUMBERTY** » Thu Apr 22, 2010 4:57 pm

this is how the pontoons will sit going all the way around the boat, each piece mitre cut at 45's around the stern and joining at the bow.

The pipe is just big enough to stuf a kitten into. (we got her out)

proportions.

This is the new transom plate. 8mm alloy.

guyph_01 · Post by **guyph_01** » Sat Jan 07, 2012 11:06 am

Is this thing running now? What happened? Pretty cool build:)

BRUMBERTY · Post by **BRUMBERTY** » Sat Jan 07, 2012 11:42 am

Still; ticking along, got the ribbing all reinforced, transom as well.
Have a magnificent stainless steel exhaust ready to tig together...wineries have all sorts of cool stainless tubing and bends!!

My old Man has been a bit sneaky and gave my two boys a 13foot Dinghy with a 20 hp on the back and told me to take them fishing!!
Superb grandfatherly action but it slowed progress somewhat.

Belting the fish at the moment though.
Flathead, Bream and squid.

This winter should see it all put together.

guyph_01 · Post by **guyph_01** » Sat Jan 07, 2012 11:46 am

Cool cool, I have my own boat project on the way. mine is the oposite, converting a inboard jet engine to a outboard:) I'm trying to get mine done asap for this summer. Keep the pics coming..

BRUMBERTY · Post by **BRUMBERTY** » Sat Jan 07, 2012 11:49 am

Shall post some this evening.
Its upside down at the moment to stop pirate behaviour from boys

YouTube · Post by **El_Freddo** » Sat Jan 07, 2012 8:54 pm

BRUMBERTY wrote:Shall post some this evening.
Its upside down at the moment to stop pirate behaviour from boys

Arrgh! It be after evening matey! Show us yer portraits or be wal'kin th' plank! *looks for pirate smilie*

Capt'n Bennie

PS Seriously though, I can't wait to see how this has progressed and even more once it's on the water at speed

BRUMBERTY · Post by **BRUMBERTY** » Fri Jan 13, 2012 2:58 pm

The hull with initial pipe attachment

316 stainless exhaust

intale housing and main engine bearers all in one

serious rib reinforcement

Still going at it.......

Hi Cptn Bennie

YouTube · Post by **El_Freddo** » Fri Jan 13, 2012 9:27 pm

BRUMBERTY wrote:Hi Cptn Bennie

Hehehe... I'd been on bookface where it's set in the pirate language, something I did for a bit of fun for a week in uni, except now I'm not in uni!

So the hull is all done, now is it to fit the running gear?

Cheers

Bennie

BRUMBERTY · Post by **BRUMBERTY** » Mon Jan 16, 2012 3:28 pm

Sorry Bennie there is heaps to do...welding, poly pipe has to go on, welding and more welding... and my welder is off FIFOing the mines.
Hmmm

it will happen