Fins attached to pods, I expect, to that they can be set at the positions and angles they need to be, rather than attached to a regular tube wall and radiating from the center.Hmmm did you make fins as walls on a body tube?
Fins attached to pods, I expect, to that they can be set at the positions and angles they need to be, rather than attached to a regular tube wall and radiating from the center.Hmmm did you make fins as walls on a body tube?
Very interesting (especially to me as likely over 90% of my rockets have square bodies and 4 sided pyramid nose cones.)If abusing OpenRocket is wrong, I don't wanna be right.
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I have typically used an equivalent area cross section. That would predict form drag properly but would underpredict surface friction and whatever extra drag comes with the sharp corners. Equal cross section perimeter might be better. That said, I also didn’t want to give more credit than was due to the fins, so there’s definitely some mind sim to be done here.Very interesting (especially to me as likely over 90% of my rockets have square bodies and 4 sided pyramid nose cones.)
How valid do you feel the aerodynamic stability calcs are for the sim?
I am curious how much an "issue" the flat sided nose cone becomes when angle of attack goes mildly over zero, as might be expected with a 5-10 mph wind gust, as well as the flat sides of the body. FWIW, my mind sim suggests either (especially the cone) likely throws the CP forward.
One hard part is what DIAMETER standard cylindrical rocket do you compare this with? a cylinder that would fit INSIDE the square body rocket, one that would fit OUTSIDE the rocket, is something in between.
You are perilously close to ruining my excuse for not learning to use OpenRocket!
First and foremost, please note the static margin shown on the OR screen grab. This makes it painfully obvious that the simulated stability is useless.Very interesting (especially to me as likely over 90% of my rockets have square bodies and 4 sided pyramid nose cones.)
How valid do you feel the aerodynamic stability calcs are for the sim?
I am curious how much an "issue" the flat sided nose cone becomes when angle of attack goes mildly over zero, as might be expected with a 5-10 mph wind gust, as well as the flat sides of the body. FWIW, my mind sim suggests either (especially the cone) likely throws the CP forward.
One hard part is what DIAMETER standard cylindrical rocket do you compare this with? a cylinder that would fit INSIDE the square body rocket, one that would fit OUTSIDE the rocket, is something in between.
You are perilously close to ruining my excuse for not learning to use OpenRocket!
I looked at it and thought it was a bit weird, but I am not a regular user. My MindSim does pretty well, as mentioned most of my rockets are square, and I would say that 95 percent are stable (kind of similar to their designer!)First and foremost, please note the static margin shown on the OR screen grab. This makes it painfully obvious that the simulated stability is useless.
If I say please enough will you build it?More OpenRocket abuse: Alcubierre 2
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Yes this is hard to do. No, it won't produce a usable flight simulation.
Not this particular one, no. I'm generally not too interested in revisiting things I've already built.If I say please enough will you build it?
Ohhh I thought that the 2 was just decoration not a actual designation.Not this particular one, no. I'm generally not too interested in revisiting things I've already built.
More OpenRocket abuse: Alcubierre 2
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Yes this is hard to do. No, it won't produce a usable flight simulation.
Or Kessel runner jr…Kind of a Alcubierre meets Kessel Runner... cue the Barry White music... and the next thing ya know, 9 months later... Alcubierre 2
Hey now, this is a family forum.Kind of a Alcubierre meets Kessel Runner... cue the Barry White music... and the next thing ya know, 9 months later... Alcubierre 2
May be time to break out the latex paint…..Kind of a Alcubierre meets Kessel Runner... cue the Barry White music... and the next thing ya know, 9 months later... Alcubierre 2
ironically, this is likely a topic that SHOULD be discussed by families.Hey now, this is a family forum.
Only in Alabama..., where marrying your cousin is apparently OK.What is that saying, “Familiarity breeds”?
The trail fin edges sweep forward, so shouldn’t impact the ground as first contact.What's the ball for? Ball in a cage? You're supposed to whittle those out of one chunk of wood. ;-)
Those fins break my brain. I think you'd have to make them pretty sturdy. Alternatively, dual deploy with an enormous main chute coming out at 200 AGL. I agree that you should build it.
If it was a real spaceship, I'd hesitate to imagine what the interior was like.
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