Differences between performances

Differences between theoretical, practical and most favorable performances

Theoretical:

The brushless lift motor uses 3 ampere to lift the whole design
The skirt of the design should be 2 inches tall
The distance between the frame plates can be 1,2 inch
There are 2 propellers of thesame dimensions needed

Most favorable:
The brushless lift motor uses 1 ampere to lift the whole design
The skirt of the design should be 1,8 inches tall
The distance between the frame plates can be 1,1 inch
There are 2 propellers of thesame dimensions needed

Practical:
There brushless lift motor uses 2 ampere to lift the whole design
The skirt of the design should be 4,5 inches tall
The distance between the frame plates can be 1,6 inch
There is 1 lefthanded propeller and one right handed propeller with turned engine needed

We can conclude that there is always a efficiency between theoretical, practical and most favorable performances. Our conclusion in this project is:
The skirt needs to be taller then expected ( which only looks better in the design which was not expected )
The brushless motor lift motor uses less elektrical energy then expected
The distance between the plates cannot be achieved when there is no mounting door in the upper-plate
There are 2 different types of trust propellers needed, an accesoire as third propeller cannot be done by this.

The reasons why the calculations didn't turn out to fit are:
The brushless motor was calculated on pure weights. So that doesn't include all of the elements that make the hovercraft lift. Because of the water the hovercraft didn't need that much power.

The skirt was designed on its roundings, wat we didn't knew was that they need to be blown up for propper work.

The plates can't be 1 inch close to eachother. This because they also need to be mounted as one.

The 2 propellers are slapping wind sideways. Thats why they can't be thesame.

So u see. Theoretical there can always be a certain kind of information missing.
That's why its always good to test it anyways, no matter how surten you are.

Lagers

To make myself more known in the world of bearing i ordered a book about bearings.
The most difficult type of usual bearings for me.

Software&hardware Flowchart

To visualize the soft and hardware of our design.. we build up a flowchart. The important thing in this flowchart is that the software components are working together with the hardware components

Quality monitoring

To monitor the quality of our project we made a PVA.
In the third fase of the project we devided responsebility.

In the last week KOEN said he couldn't finish his part of responsebility.
I allready told him he couldn't but he wouldn't listen. So we did the work.

Planning and re-planning

How the planning should have been was:

But what the planning finally was:

Falling back on sub-sub system design

8 Hours before the presentation we where afraid that the brushless motor wouldn't deliver enough power to lift the hovercraft. We looked back at our sub-sub systems and knew it would be powerfull enough, so we continued working. In the beginning we didn't succeed lifting. We knew the brushless motor was strong enough so the only thing that could be bothering was the rotor. We opened the rotorbox, used some magical glue en fitting and tested again.

And what turned out? Hell yeah, the sub-sub system design was correct.

Testing the design

This was the ultimate moment of testing our prototype!
Exiting for us all. It was as learnfull and succesfull moment.

Why we chose certain components

Because the chamber in the airpillow under the solarpanel needs to be as thin as possible it is of priority we use a thin lift motor. Normal DC motors are way to high and do not last long. This way we had to choose a brushless motor with a regulator. With this choise we are sure our design lasts long ( because the lift motor is the most used component ) and stays thin. With a lift rate of 600 grams and a speed of over 13000 rounds p/m we should have the best use of component. It has a over capacity because this way it uses less power.

The hovercrafts skirt needs to be filled with air. This is way it's important that the skirt is made of flexibel material. But what most groups seems to forget is that it's also floating on water. Then the skirt is too flexible it wil take water and sink. This is why we chose to use very thin rubber. The thin rubber we chose is originally made for peoples ponds.

As for the trust motors, we chose to use propellers, they can make a high rent but low pressure. This is good for the airflow and makes the hovercraft come forward. We use 2 small propellers because this way they don't interrupt the straight design and still deliver a high powerrate. As for the test: It was a succes. We use one left handed propeller and one right handed propeller. This way the hovercraft won't spin.




The mini servo's are very cheap and only take little power. They are a accelante choise for delivering the foodpackages at their coorinates. Why use air, high power recources etc, when u also can use the sun.

Long lives the battery

Because we want to know how long the hovercraft will last, and optimalize this, whe made a calculation of how long the battery will last. The diagram beneath includes all systems on full power. Thank god they will never be all acting on full power. It seemed that we only need 54,1 watt on full trust power, that meens the hovercraft can act longer then 2 hours with full sun!

Electrical schedule

As for the wiring: we set up a schedule with Fluidsim.

Sciencific records elektrical system

Sub- system design and sub- sub- system design

Because of the various systems we made a difference between systems, sub-systems and sub-sub systems

Gradelist fase procesplan

We got ourselves a grade for bëeing souch a wonderfull engineers as we where.. This grades include all of the first fase we when through.

Promotiefilm van het eindresultaat

THE DESIGN

Well, finally here is the endresult of the design!
Only one week left for the presentation of our prototype.

Almost finished prototyping

Here the first visualisation of building the Black Servent. Yesterday we were designing a promotionmovie of our product, today i was building on the frame of the Black Servent.

Today we tested our solar panel. always enjoying when something works!

Propeller

Earodynamics Ala Black Servent

Component Design

We are in the second week of the fase: Component design.
Today i learned the basics of calculations of construction and went to design my own propeller.

Nuclear discussion

Today we meet a discussion about nucleair technology. Some day's just don't pay out.

Robovision

Yesterday there was a Robovion event in Veldhoven. The mission was: Answer some questions and retrieve with many, many information.

The Questions:

What are physical characteristics of robots, obliging to humans?

The robot has the possibility to remind much more information than humans. This is because the robot has intern memorysystem what a human doensn't have.
A robot also doesn't get tired of listening to commands.

2. How does a robot react who listens to human?

It receives the command by a sensor. This can be a voice, a temperaturechangement, a lightpulse etc. After receiving the command it activates his computer which makes sure the designed components perform the actions which are programmed to take place in relation to the received command. The reaction can be anything that's being happening by a components output.

3. Where does a robot get's his information from? (by human)

It receives the command by a sensor. This can be a voice, a temperaturechangement, a lightpulse etc. Which kind of information it get's relies on which kind of receiver the robot exists of.

Some pictures to visualize the answers:

datamatrix sensor  from 1000 euro!!!

Charging by the sun

Today we bought our first testing part. A 12v 50w solar panel.

Tensegrity

Yesterday we learned something about the basics of tensegrity. This means: "How can you make a solid construction of 3 wooden sticks and some ropes, whithout touching eachother? Well this is the way: