donderdag 28 juni 2012

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.