04-30-2018, 08:50 PM
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Contest, Sport, it's all good......
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Join Date: Jul 2008
Location: West of Minneapolis, MN
Posts: 760
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Quote:
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Originally Posted by mojo1986
What keeps that thing stable?
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Conical Stability, as in the Centuri's "The Point". In this case a complex set of stretched cones. Key being that it had enough nose weight to be sure the CG was sufficiently ahead of the CP.
Now Chris’ model did have simulated scale “Grid Fins”, but those were not big enough and almost certainly not shaped properly like real grid fins to provide much added stability. Also, horrible Reynolds number scaling effects (grid fins might have bene 1/60 or whatever, but the air molecules were not scaled down). And this assumes Chris would have made “scale” cross-section grid fins and not the more expedient method of using some existing screen mesh to simulate the appearance.
Below, what the real N-1 grid fins looked like. Well, mounted differently. Not like a screen or a mesh, the grid fin slats are thin but very deep.
From: https://twitter.com/runnymonkey/sta...607644882161664
Quote:
When unflown N1 #rocket's were broken up, parts were repurposed by Baikonur locals. Like these grid fins, turned into a shelter.
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Ah, note how you can't see thru those grid fin slats from a diagonal view (like you would looking thru a chain link fence). Then I looked at the post-flight photo of Chris, and on the left side the grid fin assembly has a lot of sunlight shining thru it at a sharp diagonal angle. So those must have used something more like a mesh/screen, otherwise scaled slats would have blocked the light at that angle. |