Thursday, June 12, 2025

Estes AMRAAM AIM-120 Downscale, Build, Part 2, Semi-Scale "Cheat"

 




After a few searches, I found a clean copy of the Peter Alway drawing.

To view it: CLICK HERE
Note there is a boat tail on the real missile.







I did run the numbers to get the tube lengths. See the first "background" post. 

But, to get the fin patterns - 

I dropped the Alway drawings into Corel Draw and enlarged it until the body was 1" diameter. The BT-50H tubes I'll be using are .990" in diameter.
With the drawing enlarged I simply traced the fins.
Because the rocket body is tall, I had to draw the fins on two different pages.

3 comments:

  1. If you are planning to model the conduit shown on Peter’s drawing, it appears to extend all the way to the aft end of the missile. Could you possible put an engine hook there and do a boattail? The slot for engine hook movement would make it difficult to model. You could 3D print something but it’s the worst location from a heat perspective.

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    Replies
    1. Hi Augendoc,
      I was going to do an cardstock boattail but decided against it. Years ago, a kit had a cardstock boattail that was slit to allow an engine hook "hinge". After a few flexes of the engine hook, the two slits tore. The boattail is only about 5/16" high. I don't have a 3D printer. The larger Rocketarium AMRAAM kit has a 3D print boattail.

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    2. And - I am going to add the conduit as shown in the Alway drawings.

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