... Have you heard about Google? http://www.google.no/search?q=free+book+water+rockets If you need to convert a web page to a pdf, you can use CutePdf: ...
thanku..i`ve try that way... i got some.. may be other source ..? thank u ... From: Henning Negaard Torsteinsen <henning.negaardtorsteinsen@...> Subject:...
Has anyone tried using a weighted microswitch as an "accelerometer" to trigger an electronic ejection mechanism? My idea is that when the rocket is launched,...
The problem is that the acceleration curve is akin to exp(t) for 0 <= t <= .00006s, and -exp(t) for t > .00006s. I made the numbers up, but the point is that...
Of course there had to be a catch. I assumed it kept accelerating while the water continues to come out. thanks for the comment. best wishes Harry Brunt ... ...
It does accelerate as long as water is coming out (AFAIK), but the apogee of the rocket is typically going to be well after the water is exhausted. -John...
Indeed it does continue to accelerate for the entire duration of the water phase - in fact the nearer you are to the end of the phase, the greater the ...
Hi Sounds like your circuit could be used with a variety of voltages and small batteries. It just has to let the high voltage go at a good time. I sometimes...
Hi Harry, What what about removing the weight from the micro-switch and attaching something like a paddle pop stick to the armature and sticking that out the...
Hi Pat, Nice video again of RocSoccer, or is that VerticalSoccer?. :) Good to see another road landing as well :)! 154 feet sure seems a bit low. The video...
Hi Todd, Good to hear from you. I'm looking forward to more rocket developments from Hornsby. :) You mean you have been building a storage depot for rockets,...
Thanks for the suggestions, George. I like the idea of using drag to pull the microswitch down.  I do plan to publish the schematics once I have tested...
So that could mean my weighted microswitch trigger idea plus an additional delay before firing might be worth exploring further. ... From: Nicholas Olesen To:...
Thanks George. I actually made another flight the next day with a slightly longer duration (2 seconds) and the altimeter read 179 feet. I think it might be a...
It sure is, but why have the weigted microswitch then? It would just be a timer, trigged at burnout. It's probably easier to trigger at launch instead (string...
Hi Christian, You should be able to achieve the same result with an inverted mercury switch. The ball of mercury would just float up the same way as the metal...
Hello everyone, I'm new here. I'm building waterrockets since one and a half year, and really enjoy it! My last one was destroyed because the "Tommy Timer" ...
Hi Thorsten, Coming weekend I'll test a deployment system with a magnet running trough a little pipe, Basically the rocket has to tumble to a nosedive to let...
Hello Thorsten, Welcome to the forum. :) A while back Richard here started working on a gyro system for his rockets. I am not sure how far along he is in the ...
... Despite the pretty presentation and 4 of 4 success report, this is an inertial system. Such systems do not and cannot work reliably; there is simply no...
The thing I dislike about timers is that if for some reason your rocket decides to fly 20 meters higher this new record gets botched by a parachute being...
Ruben, Please be aware of the negative G forces upon engine "burn-out". Essentially the rocket is pushing into the air over 100 mph and the wind resistance...
Hi Thorsten Your idea will be nice to see in a drawing or a view of a launching etc. Looking forward to your successes. I too have looked for simple electric...
I would be interested in hearing more about your experiments with the disposable camera circuits. Ive read were some people used them to make RFID tag...
... In fact, it's preferable to deploy the parachute after apogee, unless you're in a "total flight time" competition. You can set the timer for a second after...
... Ya and you can charge a beer with them too. Hope the victim does not catch you. (test it on yourself to get the circuit working right) hehe Some Pyro...
I added a plan for using Nitinol for deploy. No circuit is sugested but the 'mousetrap' has been worked out. It's in my 'HowTo' album in the photo section. ...
