The `recovery node` is the pyrotechnic controller board designed for LV2. LV2 uses two different parachutes during its descent. The drogue chute opens first. The drouge is a small parachute that stabilizes the rocket but allows it to fall at a fairly high speed in order to minimize the distance the rocket drifts with the wind during descent. For r
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ecovery it is desirable that the rocket land close to the launch point. The descent rate on the drouge chute is too fast for a damage-free landing, so about 500 meters above ground level the drogue chute pulls out the larger main parachute. The deployment of the parachutes is achieved by pyrotechnic actuators. which are in turn initiated by "Electric Matches". (On LV2 these are Oxral electric matches. ) The electric match heads are about the same size as those of ordinary kitchen matches and burn with only slightly more vigor. Their electrical firing energy threshold is about 2mJ. The two towering goals of the recovery system are reliability and safety. Parachute failure probably means complete destruction of our vehicle. At least as significantly, the pyrotechnic actuators are potentially dangerous to our people. To minimize the danger to people we have firstly designed to minimize the inherent danger in the actuators themselves. Secondly we always handle the devices in such a way as to avoid injury should an accidental activation occur. Our third line of defense involves a system of interlocks in the recovery node. Reliability is attained by good design. This means good overall design practice, and also minimizing the number of critical components, thorough testing, and some redundancy for low reliability components. These desirable properties are constrained by the typical PSAS projects goals which seek to minimize the...
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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