Hello All,

I've been looking up scale data on the Brazilian Sonda 1 (see: https://pt.wikipedia.org/wiki/Sonda_I , https://www.gov.br/aeb/pt-br/progra...spacial/sonda-i , *and* https://en.wikipedia.org/wiki/Sonda_(rocket) ) meteorological rocket and small sounding rocket (which is covered in Peter Alway's "Rockets of The World"). There seem to have been at least two--and perhaps more, judging by the fin configurations I've seen pictures of--variants of the Sonda 1.

Its first stage was a surplus military aircraft rocket motor 127 mm (5") in diameter--like the Zuni Folding-Fin Aircraft Rocket--and the second stage used a 114 mm diameter motor. The round depicted in "Rockets of The World" had a ~4.5:1 tangent ogive nose (as did most rounds seen in other photographs, although a conical nose is also shown in some Sonda 1 photos; you can see one ^here^: https://www.youtube.com/watch?v=U2SixsUI5fQ ). Also, I read somewhere (not in Peter's book, I don't think) that there was a Sonda 1 and also a (shorter?) Sonda 1B, which had a lower peak altitude. As well:

The Sonda 1 round depicted in my copy of "Rockets of The World: A Modeler's Guide" (from 1992) shows both stages as having clipped delta fins, whose trailing edges were slightly forward-swept (*this* https://www.youtube.com/watch?v=U2SixsUI5fQ video shows a round of this configuration). But a photograph of another Sonda 1 round (in *this* https://www.youtube.com/watch?v=qVAeGgoL9WM video) shows its first stage as having trapezoidal fins, like those on Nike and Terrier rocket motors used in various sounding rockets.

Does anyone have scale data on all of these Sonda 1 variants? They would make nice-looking--and easy to build and fly, including with streamer recovery of the gap-staged first stage (using Evan "Buzz" Nau's published method), if desired--scale models for school and youth groups (I help a teacher at the Eagle, Alaska Community School, and I recently joined our local aviation museum, which has youth activities), using any standard (13 mm, 18 mm, or 24 mm) booster/upper stage black powder motor combinations.

Many thanks to anyone who can help!

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