Would canted engine clusters allow a (small) scale modeling of the Proton or Soyuz to fly straight without fins?
No, sadly canting the motors only ensures that they dont push the rocket too far off course or, in the event of a failure of one motor (in hobby rocketry), this prevents the rocket from going crazy. You still need fins because of variations in balance, wind resistance, and motor thrust. Canted motors only attempt to recreate a single motor state where all thrust goes directly through the center of the rocket. They cant do any better, so still fins! Or spin up the rocket, add a cone to the bottom, or make active guidance.One of my first rockets, in the early days before I became serious about the hobby, I made a finless rocket. I had no idea why it would be a problem, but it was.It is within the realm of the possible to give a finless rocket a very dense nose cone, and have a very high thrust rocket, and perhaps get a straight flight from it. Just maybe.
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