6 litre with parachute
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6 litre with parachute
This is a video from last year of a 6 litre rocket (4 1.5 litre bottles joined in pairs at base with robinson couplings then the two pairs joined neck to neck).
Parachute is tomy timer started by an air flap.
Launch pressure 120psi.
Altitude no idea - any guesses?
[youtube][/youtube]
Parachute is tomy timer started by an air flap.
Launch pressure 120psi.
Altitude no idea - any guesses?
[youtube][/youtube]
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Re: 6 litre with parachute
160psi wrote:This is a video from last year of a 6 litre rocket (4 1.5 litre bottles joined in pairs at base with robinson couplings then the two pairs joined neck to neck).
Parachute is tomy timer started by an air flap.
Launch pressure 120psi.
Altitude no idea - any guesses?
[youtube][/youtube]
I would guess 145.25213345 meters!
Spaceman Spiff
"What goes up, must come down"
"What goes up, must come down"
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Re: 6 litre with parachute
My guess would be around 500 feet. Nice job.160psi wrote:This is a video from last year of a 6 litre rocket (4 1.5 litre bottles joined in pairs at base with robinson couplings then the two pairs joined neck to neck).
Parachute is tomy timer started by an air flap.
Launch pressure 120psi.
Altitude no idea - any guesses?
[youtube][/youtube]
What size chute did you use?
Lisa Walker,
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The Water Rocket Achievement World Record Association
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The Water Rocket Achievement World Record Association
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Re: 6 litre with parachute
This rocket is, alas, no more - so I'm not sure of the chute size, but I think it was about 60cm diameter.
I am currently building a similar rocket but double skinned to take 200psi.
I am currently building a similar rocket but double skinned to take 200psi.
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Re: 6 litre with parachute
How do you make a double skinned rocket? Do you have bottles that fit inside each other?160psi wrote:This rocket is, alas, no more - so I'm not sure of the chute size, but I think it was about 60cm diameter.
I am currently building a similar rocket but double skinned to take 200psi.
Spaceman Spiff
"What goes up, must come down"
"What goes up, must come down"
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Re: 6 litre with parachute
Yes I shrink 2 litre bottles over 1.5 litre bottles in much the same way as described on the air command website, except I use Gorilla glue in between.
They are rock solid when cured and will easily stand 200psi plus for many launches.
I will take some pics next time I do some if you like.
They are rock solid when cured and will easily stand 200psi plus for many launches.
I will take some pics next time I do some if you like.
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Re: 6 litre with parachute
That's interesting. Sounds like it would be pretty stiff. I understand everything except what you do when you have the neck of the bottle. How do you reinforce the neck part?160psi wrote:Yes I shrink 2 litre bottles over 1.5 litre bottles in much the same way as described on the air command website, except I use Gorilla glue in between.
They are rock solid when cured and will easily stand 200psi plus for many launches.
I will take some pics next time I do some if you like.
Spaceman Spiff
"What goes up, must come down"
"What goes up, must come down"
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Re: 6 litre with parachute
Here are some pictures of the double skinning process:
The first is a pair of 1.5l bottles joined bottom to bottom with a Robinson coupling, and sanded ready to take the glue. They have been filled with cold water and inflated to about 20psi to make them rigid The next shows a sleeve from a 2 litre bottle already shrunk on and another sleeve party shrunk over one end. Next comes the neck - make sure that you shrink towards the bottome so that the bottle is always protected by cold water inside and the glue squeezes out The finished neck section - the bit that is unprotected is actually already very strong and will easily stand 250psi - all that remains is to carefully trim any excess glue that comes out as it cures. Here is one I prepared earlier, clear bottles this time and the glue is cured - total weight of finished pair is just under 200g. You can see the overlap section both sides of the middle which is actually triple walled. The 6 litre rocket will be two such pairs joined.
Hope this helps
The first is a pair of 1.5l bottles joined bottom to bottom with a Robinson coupling, and sanded ready to take the glue. They have been filled with cold water and inflated to about 20psi to make them rigid The next shows a sleeve from a 2 litre bottle already shrunk on and another sleeve party shrunk over one end. Next comes the neck - make sure that you shrink towards the bottome so that the bottle is always protected by cold water inside and the glue squeezes out The finished neck section - the bit that is unprotected is actually already very strong and will easily stand 250psi - all that remains is to carefully trim any excess glue that comes out as it cures. Here is one I prepared earlier, clear bottles this time and the glue is cured - total weight of finished pair is just under 200g. You can see the overlap section both sides of the middle which is actually triple walled. The 6 litre rocket will be two such pairs joined.
Hope this helps
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Re: 6 litre with parachute
That's a great mini tutorial on your build process. The pictures show that your method is very strong and not likely to come apart at the joint. Have you had any failures of these bottle splices in the past? The way you have them joined looks like the joint would leak air before the bottles actually exploded. What have you seen in practice?160psi wrote:Here are some pictures of the double skinning process:
The first is a pair of 1.5l bottles joined bottom to bottom with a Robinson coupling, and sanded ready to take the glue. They have been filled with cold water and inflated to about 20psi to make them rigid The next shows a sleeve from a 2 litre bottle already shrunk on and another sleeve party shrunk over one end. Next comes the neck - make sure that you shrink towards the bottome so that the bottle is always protected by cold water inside and the glue squeezes out The finished neck section - the bit that is unprotected is actually already very strong and will easily stand 250psi - all that remains is to carefully trim any excess glue that comes out as it cures. Here is one I prepared earlier, clear bottles this time and the glue is cured - total weight of finished pair is just under 200g. You can see the overlap section both sides of the middle which is actually triple walled. The 6 litre rocket will be two such pairs joined.
Hope this helps
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Re: 6 litre with parachute
In practice I have never flown them beyond 200psi, although have pressure tested to 225psi. I have never had a failure yet - one flew about 20 times and was then lost, we never did find it. All the others I have made are still fly-able although the 6 litre I am making at the moment is the first to have two such pairs joined together, the others have either been single bottles or pairs as shown above.
The 6 litre shown in this video was single skinned and did coma aprt at the joints after about 10 launches at 120psi or so and a couple of crashes.
The 6 litre shown in this video was single skinned and did coma aprt at the joints after about 10 launches at 120psi or so and a couple of crashes.
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Re: 6 litre with parachute
nice vid I guess 150m and did you use fly cam one 2 I have same broblem with voices
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Re: 6 litre with parachute
I can certainly vouch for the gorilla glue, what doesn’t stick the PET stick to your finger for days after if you don’t wear gloves. I gathered you are based in the UK, what 1.5 bottle are you using? I have recently found some 1.25 bottles that Tesco uses for their flavoured sparkling water that might work well.