#1
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Upper stage without fins
I am planning to make a 2 and mabe 3 stage rocket. Is it possible to not have fins on the upper stages? Could I angle the fins on the booster stage so that they give the rocket a spin which would help stabilize it? I know that some real rockets have no fins or only fins on the lower stage, but they use thrust vectoring and are often in thinner/no atmosphere.
Last edited by AHamm : 06-02-2018 at 04:15 PM. Reason: Typo |
#2
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Canting the fins on the booster to induce spin would help to stabilize a finless upper stage, but I doubt it would be enough to prevent a wacky flight.
It might work for a two stager but definitely not 3.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, AGITATION, CHAOS, TURMOIL, FIASCOS, AGGRAVATION, INSTIGATION, NUISANCE-ACTION, and HAVOC ! |
#3
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Sure, why not? Just include a transition instead of fins on the sustainer, i.e. a cone fin with base drag stabilization. Could omit the cone and just use a base-drag disc fin, much higher drag.
http://modelrocketbuilding.blogspot...rt-1-parts.html There might be an option to use a gas stabilization, sort of a variation on the theme of an Augie with the engine inside of a vented ring fin, essentially. |
#4
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If you have the room in the second stage, you can add flip out fins that are hidden inside the model until it stages. https://www.apogeerockets.com/educa...wsletter313.pdf
kj |
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