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Author Topic: cheap pop bottle boats  (Read 6382 times)

portside II

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cheap pop bottle boats
« on: January 24, 2009, 11:10:30 PM »

After seing a pop bottle recovery boat and a yacht on here some time ago and thought could i build one .
So into the workshop and came up with this ,


basicly its 4 75cl water bottles , a direct drive motor/shaft,brass kort prop(what i had to hand at the time) , battery and radio gear mounted on an alloy board with alloy struts ,well it looked ok on the bench but on the water it sank , so a bit of ballast (styrene foam) and it was ok .Yes it moved under its own power like a submarine , all it wanted to do was either dive or make froth.
So back in the workshop i swapped the 4 small bottles with 3 big ones and ended up with this,

basicly the same set up but a smaller battery and a longer shaft and 2 blade 65mm plastic prop, it went ok , as well as 3 pop bottles can go .
But i still aint happy so the next thing is to get 2 2ltr pop bottles cut and join them together on length and fit the radio motor etc in that with a keel and see what happens .
Still waiting for the tablets to take effect ,
daz
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tigertiger

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Re: cheap pop bottle boats
« Reply #1 on: January 25, 2009, 12:56:17 AM »

Ha ha. i didn't look properly at the first picture and thought it was 4 x 2ltr pop bottles and a washing machine motor.  :embarrassed:

On the subject of ballasting, you could try puttin some water (will slosh about) or sand in the rear bottles. This may stop the nose from diving.
I think the biggest problem may be weight so far above the waterline.
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barryfoote

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Re: cheap pop bottle boats
« Reply #2 on: January 25, 2009, 08:33:24 AM »

Portside,

Keep taking the tablets. Next you need to build a rescue boat for the sunken rescue boat!! %% %%

Only joking.....

Barry
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Arrow5

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Re: cheap pop bottle boats
« Reply #3 on: January 25, 2009, 09:44:16 AM »

The heir to the de Rothschild banking dynasty is building a far more ambitious pop bottle boat to sail the trash area of the Pacific where all the oceans waste ends up. Do a Google  search for  Plastiki  One report says he looks like Lord ! {:-{
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portside II

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Re: cheap pop bottle boats
« Reply #4 on: January 25, 2009, 10:39:53 AM »

Ha  i will be waiting for his phone call , can i copywrite my designs  this chap sounds as if he is a sandwich short of a picnic .
Tiger i tried the water balasting method with mk2 ,only in the rear bottles to give a little lift forwatds , but she still dives in reverse.
That one has gone to the recyling center in the landfill sky , so when i get the new bottles mk3 will be started.
watch this space.
daz
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Roger in France

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Re: cheap pop bottle boats
« Reply #5 on: January 25, 2009, 11:20:52 AM »

It looks to me as if the nose down attitude results from what appears to be the steep incline of the prop shaft. A great deal of power is apparently being absorbed trying to push the rear up out of the water.

Easy to test for: does she float reasonably level when static and then immediately nose dive when power is applied?

Roger in France.
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tigertiger

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Re: cheap pop bottle boats
« Reply #6 on: January 25, 2009, 11:46:12 AM »

Kort nozzle drive perhaps.
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portside II

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Re: cheap pop bottle boats
« Reply #7 on: January 25, 2009, 05:45:02 PM »

thats the one with the plastic screw prop on , you have to remember there was a 12v battery weighing it all down.
daz
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tigertiger

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Re: cheap pop bottle boats
« Reply #8 on: January 26, 2009, 02:17:43 AM »

The 12v battery may have been part of the problem. All that weight so far above the waterline acting like a giant upside down pendulum, and the prop giving it a push/swing, so to speak.

Thinking out of the box for a moment.
Maybe if the battery were smaller, and the boat was longer.
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portside II

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Re: cheap pop bottle boats
« Reply #9 on: January 26, 2009, 02:36:03 PM »

Yes that would be better , less weight and longer length . thats why i am thinking of a torpedo shaped hull and racing pack to power the motor , will probably last longer than the SLA and give more speed , still no idea on design.
daz
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tigertiger

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Re: cheap pop bottle boats
« Reply #10 on: January 26, 2009, 11:39:54 PM »

Some crazy thoughts for getting the c of g down.

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portside II

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Re: cheap pop bottle boats
« Reply #11 on: January 27, 2009, 12:05:48 AM »

thats a god idea there , and it may develop into a prototype , i was thinking more in the lines of using two bottles end to end with some ballast and stabelizing fins .
daz
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tigertiger

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Re: cheap pop bottle boats
« Reply #12 on: January 27, 2009, 12:18:22 AM »

Rather than stabiliser fins, you could use a drop keel. And this would creat its own problems.

I still think a Cat is the best way forward, because of the tendancy to roll. Especially if the cofg of above the waterline.
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tigertiger

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Re: cheap pop bottle boats
« Reply #13 on: January 27, 2009, 12:20:50 AM »

Another thought.

Double up what you suggest, strap them together and either have differential steering or shared ESC and shared rudder servo.
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portside II

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Re: cheap pop bottle boats
« Reply #14 on: January 27, 2009, 10:10:05 AM »

Ooh   :o thats a thought , now all i need is time and some space in the workshop .
daz
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Boy From the Bay

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Re: cheap pop bottle boats
« Reply #15 on: January 27, 2009, 11:04:46 AM »

I shall have to have a go at one of these.
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portside II

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Re: cheap pop bottle boats
« Reply #16 on: January 27, 2009, 03:52:10 PM »

Oh no  :o , this is how the springers started  :embarrassed:  O0 .
daz
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Capt. Spaulding

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Re: cheap pop bottle boats
« Reply #17 on: January 27, 2009, 04:21:39 PM »

Hmmmmmmmm...this thread and the sketches have got me thinking, which is never good.

Please keep the ideas coming.

One question that comes to mind: what adhesive works with plastic bottles and, say, sytrene?

Cheers,
Capt. Spaulding
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portside II

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Re: cheap pop bottle boats
« Reply #18 on: January 27, 2009, 04:44:45 PM »

tie wrap's  :}

not sure , more than likely standard styrene glue  will have to do the blob test .
daz
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Capt. Spaulding

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Re: cheap pop bottle boats
« Reply #19 on: January 27, 2009, 06:03:08 PM »

Tie wraps are a very good idea. They are used by the folks who make ROVs, I believe.

Any place for PVC pipe in this brain-storming process? It's strong, inexpensive, easy to work with, comes in various diameters, can easily be made water-tight, and has pre-made fittings and angles.

Cheers,
Capt. Spaulding
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Globs

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Re: cheap pop bottle boats
« Reply #20 on: January 31, 2009, 06:04:14 PM »

Hmmmmmmmm...this thread and the sketches have got me thinking, which is never good.

Please keep the ideas coming.

One question that comes to mind: what adhesive works with plastic bottles and, say, sytrene?

Cheers,
Capt. Spaulding

Use a glue gun!
These bottles look like good submarine building material.....

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