This can be a thin strand of wire, like one of the copper `hairs` from a section of lamp cord, which is wired to the altimeter by terminals somewhere on the rocket body and anchored to the launch stand at some point. Rocket takes off, stand holds the wire back. Wire breaks, circuit is interrupted, and timer starts timing. Possible downside: Too
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strong a wire could hold a small rocket back. Dangling wires could contact each other in flight, restarting the countdown and making for late ejection. b. I`ve heard of those that ran the current through a section of solder which went under the rocket nozzle. Exhaust heat melts solder, provided that the solder stayed in place. Actually that much heat could melt copper almost as easily. c. Another is to put a reed switch in the rocket, and have a magnet on the launch rod hold it closed. Rocket leaves rod, switch opens, timer starts timing. d. Some folks mount an audio-type earphone jack in the tail end of the rocket, facing down. A tethered plug is inserted in the jack, keeping the circuit closed. The plug is tied to the launch stand, so that when the rocket takes off, the plug is jerked out, the circuit broken, and the timer starts counting down. Possible downside: these jacks are not designed for high acceleration, so their reliability under rocket conditions must be monitored. Also, exhaust products are corrosive, and may cause flaky connections with any electrical connector mounted near the motor. e. Terminals on the side of the rocket are connected with a strong wire by small alligator clips, like those used for Estes ignitors. Wire is mounted firmly to test stand, so that when rocket takes off, the wire stays behind - clips slip off the terminals, breaking connection and starting the timer. Obviously, the rocket needs...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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