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  #1  
Old 06-02-2018, 05:13 PM
AHamm AHamm is offline
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Join Date: Jun 2018
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Default 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 05:15 PM. Reason: Typo
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  #2  
Old 06-02-2018, 10:43 PM
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ghrocketman ghrocketman is offline
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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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  #3  
Old 06-03-2018, 01:25 AM
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GlenP GlenP is offline
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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.
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Old 06-04-2018, 11:52 AM
kevinj kevinj is offline
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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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