Part 2, 7 July, 2004
By Mark Uitendaal and Leon Krancher

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Disclaimer: all liability waved! Contents of this website are presented for informational purposes only. Do not try to recreate any experiment presented in this web page. The NAVRO and the author of this article cannot assume responsibility for any use readers make of this information. In Holland it is forbidden by law to own this type of propellant if you don't have an exemption of the "Wet Explosieven Civiel Gebruik" (WECG).

After a good time of thinking we completed the conceptual-design of the rocket and booster. Also, arrangements are made with several people for construction of parts. First, Benjamin Wilkosz will make the mold for our concrete nozzle for the 75mm booster on his lathe. We know from experience that he can make very good and precise products. This guy is a real wizard with a lathe. You should see his website Boys Toys!
We ordered our centre-rings from Caveman Rocketry. The reason is that this company can make more precise products than we can, because of special tooling.
We have also made a beginning for a prototype of the booster-motor. The motor will be over 800mm tall so the whole booster-unit will be up-scaled to 900mm. We will investigate stability of this new model.

In this drawing you can see that 50% of the whole vehicle will consist of motor. We agreed that we will use "lean-manufacturing" again. This is done because we have very good experiences with this production-concept during the "Shock and Awe" project.

We expect to test our 75mm PVC booster motor in September or October. First we will do a structural test, to see if the design is structural sound. If the motor passes that test we will do an instrumented test. Over the next months we will have to face several problems of motor construction. Problems such as how to cast and trim grains of this big size. How to cast nozzles of this size etc.

I have also tested the camera. First of all, I tested the FOV-angle (Field Of View-angle). It seems that the camera has a horizontal view of 53° and a vertical view of 40°. I have tested it with the following set up:

I placed the paper with the rings in front of the camera and searched for the minimum distance in which the ring would appear on TV:

I also conducted a test to see what is the visibility of a camera rotated 10° outward. It seems 10° is just fine! You can still see the rocket body pretty good, but probably threequarters of the screen is filled with surroundings.

But first: holidays!

Next part: Spectre II, part 3, 22 October, 2004

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