View Full Version : First water test

Sean Atterbury - n/a
7-Mar-06, 10:33 AM
OK so I want to take the craft to the dam this weekend, I have been cruiseing around our local rugby field for some time now and am, well sick of sircles. I know it does'nt leak because when full of water, the water stays inside, so I am pritty shure it will float. I hope. http://hovercraft.org.uk/images/icons/smiley_icons/icon_redface.gif

What would be a good routine of tests to do? http://hovercraft.org.uk/images/icons/smiley_icons/icon_cool.gif

I was thinking enter water and stop close to shore and see if it floats for a start but would like a list of tests, any sugestions. http://hovercraft.org.uk/images/icons/smiley_icons/icon_rolleyes.gif

tonybroad - n/a
7-Mar-06, 11:49 AM
Going on/off water is pretty straightforward just make sure initially you keep moving and don't stop on the water

if you stop on the water 'getting over the hump' is your biggest challenge and should be practised

if you stop and then try to get going again you will find the craft may well be trapped as the pressure underneath the skirt causes a 'dish' in the water and you have to get over the lip of it

the way off the hump is to lean as far over the front as possible and give it full throttle, sometimes a rocking motion can also help - you should feel the craft suddenly 'pop up' and start hovering again - whilst it is on the hump you will get excessive spray

Once you've mastered going on/off the water try getting over the hump - some craft do it no problem, some (mainly under-powered craft) can struggle but it's an art you have to master !! - we've all been there

Good luck, let us know how you get on


Sean Atterbury - n/a
7-Mar-06, 12:21 PM
Thanks, I have got the adjustable splitter and I think the 503 has the power, so is this rite?

Splitter fully closed for more thrust, weight far forward and give it all she's got...

Next question.

Is it better to go onto land from water, streight or sideways?, I thaught to prevent the nose hitting the ground and breaking my craft, sideways.

Next question.

If it sinks, what kind of damage can I expect to find inside the engine and how would I go about gettin going again.? http://hovercraft.org.uk/images/icons/smiley_icons/icon_evil.gif

PS: I hope that this never happens...

nickyd - n/a
7-Mar-06, 01:41 PM
wear a life jacket!! http://hovercraft.org.uk/images/icons/smiley_icons/icon_surprised.gif

Sean Atterbury - n/a
7-Mar-06, 01:50 PM
Daaaaaaaaaaaaaaaaaaaaaaaa!!!!!!!!!!!!!!!! http://hovercraft.org.uk/images/icons/smiley_icons/icon_rolleyes.gif

richardevans - n/a
8-Mar-06, 09:01 AM
Do it stage by stage.

Find some shallow water (near the bank) and stop the craft without stopping the engine (low revs - to allow you to get going quickly if it does start to take in water). Sit there for a few minutes and if everything is OK stop the engine and sit there for longer.

Don't let it sink and good luck!

Richard E

tonybroad - n/a
8-Mar-06, 11:10 AM
As far as the splitter goes i'd just experiment - yes you need thrust to get over the hump but you also need lift - i'd try splitter fully open first

i've never seen a 503 struggle to get over the hump


Sean Atterbury - n/a
9-Mar-06, 07:06 AM
Thats good to kno http://hovercraft.org.uk/images/icons/smiley_icons/icon_smile.gif

How'z about on water hovering, what am I to expect and what should the craft attitude be, eg. nose up or level etc.?

Also, what do I do in the event of a plough in?

Cant wait till Sunday..

PS: this is the 4th time I am typing this, wvery time I klick on a slilie I loos all my text.

Michel - n/a
13-Mar-06, 07:00 AM
Hello Sean,

in ( bad ) case your craft sink, first :

before test flight , you must have a 10 m rope tied on hull with a floater at other end, make your check flight on plain water, not salted. Bad things are thermic shock on engine, water on electric starter, or water pressure raming INSIDE waterproof bearings.

1) Remove craft from water ( stupid item )

2) Remove water from craft ( .......... )

3) Remove water from engine( s ) , drain + new oil.

4) Dry electric starter and wiring.

5) Change or dry air filter.

6) Restart engine as soon as practicable and let it run at least for one hour at 1/3 max rpm.

7) Prepare yourself to change bearings or electric starter.

During the Raid , several crafts have been drownded, for several reasons, all have been restarted, and work normally now.

But, on your check flight, first , let it down on water keeping engine running on idle, and move on your craft like if you want to change spark plugs, or catch a tow rope, or help someone getting onboard from water.

On the raid , Jean - Claude, our beloved Chief, request all craft pilots to go on water , stop engine for 45 mn, dive in water, climb back on craft on their own, restart, and back to paddock.

Be safe and happy and lucky .


Sean Atterbury - n/a
13-Mar-06, 07:39 AM
Well it did'nt sink, however it did take on water. http://hovercraft.org.uk/images/icons/smiley_icons/icon_mad.gif

Started up the craft and let it worm up, first of course checked all the usual stuff, then killed the engine and restarted from inside the craft to make shure that it would.

Started out for the water and for some reasonjust powered it out into deep water, had to totally close the splitter as the spray was too much, went about half a K out, turned around and headed for shore. near the shore closed the throttle to idle and sat for a while, all was fine, then killed the engine, and sat for just about a minute, then saw water comming through where the bolts that hold the motor go through the hull, it came in quite fast too, so I quickly started the motor, first pull too and went ashore. http://hovercraft.org.uk/images/icons/smiley_icons/icon_smile.gif Not bad I fealt, realy thaught that it would be worse.

After chucking out the water decided to have some lunch and felt good to go for another spin, Got in started up and hovered into the water, sat on idle for a while to then try get over the hump.

Powered her up to 6500 revs and started to move forwar, so resistance took place but then with a woosh she poped out and off we went, nose up high but going serprisinglly well, looked back to see all 6 back skirts flapping in the wind, they must have still been full of water and the cableties just snaped like nothing, made my way to shore and called my suport to get some new ties. Must take some with on the craft next time out. Tied the skirts and off we went again.

After some time of cruising around a bit, enjoying every minute, decided that speed was needed, so opened her up to 6 600 and off we went, http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif WOW http://hovercraft.org.uk/images/icons/smiley_icons/icon_eek.gif Man this thing realy goes on the water... http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif

I will findout how fast when my buddy goes with some time with his speed boat.

Almost got a wheelie going but just does'nt want to do it yet, however a plough in is one thing I found out catches you off guard and is a lot of fun. http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif

I laughed and laughed after it happened.. http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif Almost threw me out.. http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif

Took things a bit slower after that and seems my throttle can be adjusted and left like that, I put her at 4500 and left it there, this alowed me to stand, jip that's right, stand, no hands and upright, on ly feet. Wow. If you havent tried that, try it, what a feeling, and to turn, well just lean a bit to the one side and you turn nice and slow. http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif infact I think standing is the best way to do it, better view and all. Kept the Lanyard on, just in case, safety first you know.

To conclude I need to do a few things to get the craft to what it needs to be:

1.: Fibreglass the bolts in water tight.

2.: chuck in a builge pump

3.: Get a Horizontal rudder for water use, craft does'nt quite sit as I would like, bit too much nose up.

Other than that, OH MY what a life. http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif

tonybroad - n/a
13-Mar-06, 07:49 AM
Now you know why we are all so obsessed - good job http://hovercraft.org.uk/images/icons/smiley_icons/icon_smile.gif standing up ?? not sure on that one

Michel - n/a
13-Mar-06, 08:58 PM
Hey Sean,

We all have made stupid things with motorbikes, cars , airplanes, lawn mowers and hovercrafts.......

But we cannot encourage newcomers in such a way in this forum.

Think about a foam protection on your handlebar, can save bones or teeth, don' t laugh, it has been seen yet.

Playing " Silver Surfer " stood up on craft is not a good thing , that means your throttle can be stuck in high speed position, would you do it with your car on highway ?

Drive safe, drive for long, we need a positive image of hovercrafts to extend our schoolyard.


andycollins - n/a
15-Mar-06, 03:34 PM
OK Folks,

I've decided to prune this thread as things were getting a little heated.

Let's keep the mud-slinging out of here and keep it personable.