idea

[zetez]

My english isn't good so the image below will explain delaying the pulling of the parachute.

PS. Why I can't edit my posts?

[alamo]

rockets-in-brighton : "Firstly, thank you very much for showing us your progress. Your standard of construction is far higher than I believe most of us could aspire to, so we can only look on and admire."

semblance of tought assignment, real less demanding

"Perhaps if you reply here we can use Google Translate or Babelfish on your responses."

google translator has chaos, forum .cz, my languagee slovak .sk :P
http://en.wikipedia.org/wiki/Slovakia
http://en.wikipedia.org/wiki/Czech_Republic
language analogous with
i write article into blog.sk.. google translator, translate far superior

U.S. Water Rockets1 "There's a lot of unexplored ideas that stem from this."

yes.. various people examine
http://www.mo-na-ko.net/Parazit.htm
http://www.mo-na-ko.net/images3/Parazit_040.jpg
http://www.mo-na-ko.net/images3/ParazitTurbina01.jpg
my project reducer
http://www.papirove-modely.cz/galerie/i ... mage=52793

zetez "I have an idea with similar windmill."
welcome into club "Don Quijote de la Mancha"
http://donquijote.cc/db1/00010/donquijo ... ndmill.gif

rocket complete
http://www.papirove-modely.cz/img/uploa ... 9-full.jpg
gallery http://www.papirove-modely.cz/galerie/i ... mage=53764
spring turn out first parachute
http://www.ulozisko.sk/obrazky/223486/pruzina.jpg
testing
[youtube][/youtube]

terrrible weather.. rain.. wait for flight time

[rockets-in-brighton]

rockets-in-brighton : "Firstly, thank you very much for showing us your progress. Your standard of construction is far higher than I believe most of us could aspire to, so we can only look on and admire."

semblance of tought assignment, real less demanding

Mmm. You are modest. This is very fine work.

"Perhaps if you reply here we can use Google Translate or Babelfish on your responses."

google translator has chaos, forum .cz, my languagee slovak .sk :P

Yes I found out when I tried to follow your original links from this forum. However, copying & pasting your text into Google Translate works fine (well, as long as I choose 'Slovak' as the source!)

terrrible weather.. rain.. wait for flight time

[/quote]

The weather for next weekend looks good over Bratislava... Good luck!

[Jelo]

nice but looks heavy...

[rockets-in-brighton]

nice but looks heavy...

See above:

prototype 0,01 Kg

material

http://www.ulozisko.sk/obrazky/213052/DSC00320.JPG

cardboard, paper, glue, "wood", thread, pet..

[alamo]

Jelo: ..looks heavy..

0.14 kg.. complet..
heavy?

care for coefficient of drag, wind tunnel don´t have :P
radial turbine, stable number of revolutions, to various rate of flow.. suffice good eye..
high price - drag..
(axial turbine hypersensitive - lower drag)
coefficient of drag, problem

[Jelo]

wow dat's fairly light for something like that again, your work is amaising, well done, hope it flies well when the weather gets better, please post a video

[alamo]

first flight = crashtest

gallery : http://www.papirove-modely.cz/galerie/i ... mage=54659

abruptly high rotation speed, more than 23/sec.
expectant max. number of revolutions 12/sec.
(+ g-force) destroy clutch within timer.. turbine it needs speed reducer

rockets-in-brighton : "Firstly, do you know what airspeed would be equivalent to the air jet applied in the demonstration?
Have you been able to model the behaviour under anything like the characteristics of a typical water rocket launch, ie very strong acceleration for a few 10ths of a second followed by constant deceleration?"

just now find in situ.. in-flight..

zetez : "I have an idea with similar windmill."

alike.. as sure as T.D.E, it is necessary reducer..

[rockets-in-brighton]

first flight = crashtest

abruptly high rotation speed, more than 23/sec.
expectant max. number of revolutions 12/sec.
(+ g-force) destroy clutch within timer.. turbine it needs speed reducer

I'm sad to hear that. I hope the next attempt brings better luck.

At least you have a good idea of where to make adjustments. The rotation speed is amazing, can you fit a larger coaxial pulley in the space available?

Also, Do you have some rockets data (weight, launch pressure etc) so we can run some simulations for the launch, and so get an idea of what conditions applied?

[alamo]

..(weight, launch pressure etc)..

rocket volume 1.5l
water volume 0.5l
pressure 500 - 550 kpa (assessmesnt.. difficultys T-connection air pressure gauge)
nozzle size 9mm
bottle diameter 87mm
dry mass 140g

apogeum (assessmesnt) 30m
distance blastoff - impact 40m
trajectory cyclical
light wind

[U.S. Water Rockets1]

Jelo: ..looks heavy..

0.14 kg.. complet..
heavy?

care for coefficient of drag, wind tunnel don´t have :P
radial turbine, stable number of revolutions, to various rate of flow.. suffice good eye..
high price - drag..
(axial turbine hypersensitive - lower drag)
coefficient of drag, problem

Excellent work on the build. Keeping it light is the key to success! You do great work!

[alamo]

"Excellent work on the build. Keeping it light is the key to success! You do great work!"



"The rotation speed is amazing, can you fit a larger coaxial pulley in the space available?"
reducer 2°, reduction-gear ratio 6.25 - 1

[youtube][/youtube]

[zetez]

My english isn't good so the image below will explain delaying the pulling of the parachute.

I've tested this idea and it doesn't work. Force of air during a flight isn't enough to pull out a parachute by a windmill.

[alamo]

"Force of air during a flight isn't enough to pull out a parachute by a windmill."

pull out a parachute not.. unlock "door catch" yes

final reducer 18:1
http://www.papirove-modely.cz/phpsource ... foto=55481

http://www.papirove-modely.cz/galerie/i ... mage=55484

[Jelo]

another thing you could do is install a fly wheel, you can easily get some of some toy cars