MAE 1202: Aerospace PracticumAssigned: April 18 or 19, 2013

Laboratory Homework #6Due: April 26, 2013

The purpose of this homework assignment is to practice freehand sketching. Although freehand sketching of an isometric view or a 3-view drawing may appear old-fashioned or outdated with today’s graphics capabilities, you will be amazed at the perspective you can gain from sketching such views. Furthermore, having a ‘physical feel’ for how objects are laid out in a technical 3-view drawing will greatly enhance your appreciation and understanding of the same drawing views in Creo Parametric.

Drawing 1: Scramjet Wind Tunnel Model

Within the last few years, the NASA’s X-43A was the first technology demonstration of sustained Scramjet propulsion at speeds in excess of Mach 10. In a few weeks we’ll spend a lecture on air-breathing propulsion and discuss what the major components of this engine are and how it works to generate such tremendous speeds. Some pictures shown below in Figures 1 and 2 should give you an idea of what the X-43A scramjet looks like:

Figure 1: X-43A Vehicle Ground Testing / Figure 2: Artist Conception of the Hypersonic Vehicle in Flight

Our task in this homework assignment is to help create a simplified, reduced scale version of a scramjet power vehicle for testing in the FIT shock tunnel facility. Your task is to take an isometric view of this simplified engine and generate a 3-view sketch which will give our experimenters a quick look at what this model really looks like.

Here is an isometric sketch of the engine – the sketch isn’t intended to have the geometry of the actual engine, but only the general shape, which will make it easier for you to sketch:

Figure 3: Isometric Sketch of Scramjet Powered Vehicle for Wind Tunnel Testing

In your 3-view drawing you must:

1)Use green-tinted engineering paper for your drawing oriented in landscape.

2)Your drawing will show 3 views of the model, so choose an appropriate size for each of the views so that they fit well on the paper. Show the following views:

  1. The side view of the model in the lower left corner of the paper with the front of the vehicle pointed to the right.
  2. The front view will be shown in the lower right portion of the page.
  3. The top view is shown in the upper left portion of the page.

3)Try to keep the drawing to scale to the best of your ability.

4)Once you have completed your drawing make sure that all the lines that indicate the actual vehicle are darkened relative to your sketching lines.

5)Some where near the bottom right hand portion of the paper print your name, date and section number.

A 3-view drawing of the actual X-43A (with some dimensions to give you an idea of how big it is) is shown below in Figure 4:

Figure 4: 3-View Drawing of the X-43A Scramjet Engine

Note that in Figure 4 there are some differences with the directions given above. Namely the engine is pointed for flight to the left and the layout of the views is different. Also the engine shown in the 3-view drawing above is much more complicated than the simplified wind tunnelversion of the model that you need to sketch.

Drawing 2: Isometric View of Satellite Bracket

The bracket shown below is used to mount a gyroscope to the side of a new satellite. Using this 3-view drawing, create an isometric view of the bracket that best represents the object. Usethe attached isometric paper for your sketch and pay attention to scale. Concerning the curves and holes, do your best to make them look as you think they would in an isometric view of the actual part. You can learn how to construct such isometric curves using the on-line tutorials on the course website.

Extra Credit: Drawing 3 High Aspect Ratio Glider

Create an isometric view of the glider shown below.

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