I ran into some sizing problems when printing out the PDF of the Thor Agena B SP-28 pattern sheet.
Most of the sheet is very close and those patterns used for cutting fins and marking the body tube.
The nozzle print was grainy and a bit large when fit on the BT-20 motor mount tube.

I went ahead and re-drew the nozzle, the PDF is attached.
There are four on the PDF so you can make a few and pick the best fitting nozzle.
When forming and gluing the first nozzle - Test fit with the BT-20 on the narrow end and over a 20/50 ring on the wide end.
Make minor adjustments on the next nozzle formed until you get a good fit.

The pictures show the print from the PDF supplied by Kurt Schachner.
That original nozzle is on the upper left.

The nozzle on the lower right (against the 20/50 ring) is the re-draw.

Attached Thumbnails

   

Attached Files

Thor Agena B SP-28 Nozzle Shroud.pdf (388.1 KB, 64 views)

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Hans "Chris" Michielssen
Old/New NAR # 19086 SR

www.oddlrockets.com
www.modelrocketbuilding.blogspot.com
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