21/03/2018
Of course, as most things in life, nothing goes exactly as planned. Today, we tested our machine, and we have realized that the automatism technology for the launching of the birdies does not work. The problem is that when we put the metal stick between the handles with the forks attached to it, the stick will not remove itself when the machine advances. The reason for this is because the upward tension of elastics forcing on the forks is much bigger then the force of friction excreted between the wheel and the stick when advancing. This means that, when we launch the vehicle, the front left wheel and the stick dont move, leading to the birdies not being launched. We are currently looking for a solution for this but fear that we might have to complete the competition tomorrow with only a semi-automatic machine, which will make us lose quite a few points. Hopefully, we will be capable of collecting enough points to permit us to make up for this handicap.
SCIENCE ON TOURNE!Project
Friday, March 23, 2018
Ready For Launch
20/03/2018
A few updates:
- the catapult has now been constructed with the forks, and is launching well.
- The automatism system for the catapults is working, and the stick is sliding well on the when moved. It needs to be tested with the tension and the sticks tomorrow.
- Machine final assembly will be tomorrow, and it is scheduled for immediate testing on the same day.
- We have decided to name our creation Shelby. This is because the Ford Shelby car is a rear wheel drive car like our machine, that produces a lot of horsepower. Ironically, ours probably generates zero to no horsepower with it's amazing rubber band system.
For now, everything is looking in place, and we are confident that we will manage to obtain the ten full points for our machine.
A few updates:
- the catapult has now been constructed with the forks, and is launching well.
- The automatism system for the catapults is working, and the stick is sliding well on the when moved. It needs to be tested with the tension and the sticks tomorrow.
- Machine final assembly will be tomorrow, and it is scheduled for immediate testing on the same day.
- We have decided to name our creation Shelby. This is because the Ford Shelby car is a rear wheel drive car like our machine, that produces a lot of horsepower. Ironically, ours probably generates zero to no horsepower with it's amazing rubber band system.
For now, everything is looking in place, and we are confident that we will manage to obtain the ten full points for our machine.
Change of plans
14/03/2018
The two teammates have met up at Oliver's house to discuss what the new machine should look like. After some research and discussing, we have concluded that we would like to be the smallest possible, all while having it be powerful enough to hopefully launch into the last section. To add up, we would like it to be naturally powered and to be made entirely with recyclable material.
The two teammates have met up at Oliver's house to discuss what the new machine should look like. After some research and discussing, we have concluded that we would like to be the smallest possible, all while having it be powerful enough to hopefully launch into the last section. To add up, we would like it to be naturally powered and to be made entirely with recyclable material.
Please Read!!!!
Hello, it has came to our attention that all of Darius' blog posts since the march brake have been posted on the wrong blog. For that reason, all of his posts are being reposted on this day, March 23rd and might not be in chronological order. He will write the date of happening for each post in it.
Sorry for the inconvenience, the team
Sorry for the inconvenience, the team
Progress with the new machine
15/03/2018
The base of the new machine has been constructed! The only problem that has been found for now is that the wheels that we intended to use, made out of plastic bottle caps are not big enough or slick enough to advance the machine. The solution we have found for this is to instead use some old skateboard wheels that Darius found in the basement, which should work better.
The base of the new machine has been constructed! The only problem that has been found for now is that the wheels that we intended to use, made out of plastic bottle caps are not big enough or slick enough to advance the machine. The solution we have found for this is to instead use some old skateboard wheels that Darius found in the basement, which should work better.
Technical advances
19/03/2018
While constructing the machine, the original plan was to use cardboard boxes to keep the birdies from falling when they where launched. What we realized pretty much immediately is that when they are held back in that way, the birdies do not fly very far because they are shot at a less then optimal angle. After some testing, we found out that when placing the birdies in the forks, they can stay put in them for a longer period when being launched. This lets them fly off at a lower angle and incidentally, fly further.
While constructing the machine, the original plan was to use cardboard boxes to keep the birdies from falling when they where launched. What we realized pretty much immediately is that when they are held back in that way, the birdies do not fly very far because they are shot at a less then optimal angle. After some testing, we found out that when placing the birdies in the forks, they can stay put in them for a longer period when being launched. This lets them fly off at a lower angle and incidentally, fly further.
En fin de compte...
Dans le cours de
physique mécanique, un projet fut assigné aux étudiants. Ce projet avait comme
but de bâtir une machine autonome, capable de parcourir une certaine distance
par elle-même et, par la suite, de tirer des volants de badminton dans une zone
de jeu, essayant donc de marquer le plus de points possibles. Notre projet
personnel était de fabriquer une machine de petite et simple que tout le monde serait
capable de reproduire sans difficulté. Nous l’avons nommé Shelby. La principale
source de fonctionnement de Shelby est à l’aide d’élastiques. Pour propulser
notre véhicule vers l’avant, nous avons « crinqué » les élastiques en
faisant rouler la voiture vers l’arrière sur le plancher. Une fois lâchée, elle
commençait à rouler par elle-même sur les roues, placés aux deux extrémités
d’un bâton, en avant et en arrière de l’engin. Une chaine d’élastiques relie les
deux bouts de bois et, lorsque le véhicule est lâché, il, de déroulent, fessant
avancer le véhicule. La raison pour laquelle nous avons utilisé cette façon
pour faire avancer notre véhicule est puisque nous voulions utiliser que des matériaux
recyclables et réutilisables. Puisque notre véhicule avait de la difficulté à
avancer car les roues tournaient dans le vide, les deux roues arrière ont été
recouverts avec du tape d’hockey, ce qui augmente le coefficient de friction dans
les roues et donc pour augmente la traction. Pour lancer les moineaux dans la
zone, nous avons fabriqués 3 catapultes à l’aide de fourchettes. Nous les avons
enroulés avec des élastiques à plusieurs reprises pour que la tension crée par
ceux-ci soit assez grande pour propulser nos projectiles. Les fourchettes ont
été utilisés puisque les dentes de la fourchette passent au travers des trous
des volants, les permettant d’être projetés à un angle plus bas. Un problème
rencontré au cours du projet était dans le catapultage des volants. Au début, l’idée
était de déposer une tige qui enclenche les catapultes sur la roue d’en avant.
Donc, lorsque le véhicule avancerait, la tige tomberait en bas du véhicule après
un certain nombre de temps. Cela n’a finalement pas fonctionné, car lorsque
nous faisions passer la tige au travers des trou qui retenaient les catapultes,
la force de tension vers le haut émise par les élastiques était si grande que
la tige ne pouvait plus sortir.
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