Brainlord Mesomorph
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- Apr 2, 2018
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According to OR, this will fly assuming those "laser cannon" thingys in front weigh 25g a piece.
I was thinking of like launch lugs filled w/ clay but that's not enough, maybe filled w/ a section of a carpenter's nail.
But I was wondering if anyone had a better idea.
Maybe some metal war model I could kit-bash. Something from model trains or planes I could re-purpose?
AHA TIA
EDIT: CONCLUSION/TLDR:
This was a terrible idea. Guys toss around a few ideas on this in the thread below. Some tell me not to do it. I did some further work on the subject;
1. Its ridiculously dangerous.
No matter what you use as ballast (putty, metal and epoxy, whatever) by the time you pack it into an aerodynamic shape (a straw, a launch lug, a cone) and cover that in glue, and glue that to the point of a balsa fin, cover that in three coats of enamel, and fly that at 150 mph … if that’s not bullet, it is an arrow. Actually two of them!
2. And it will never fly:
According to OR, with a C engine, this thing gets 12 Gs of acceleration before it’s off the rod. Which means these 25g weights become the equivalent of 300g weights! And while they do combine to have a common CoM in the center of the rocket, individually they do not. So they are going to be pulled downward and outward (at 300 grams) during launch. If that doesn’t just rip the fins off the body tube or snap them in half, then it *must* bend them drastically, and that’s going to be steering the rocket some random direction – WITH TWO ARROWS ON THE FRONT OF IT. This was a terrible, terrible idea.
So please do not attempt.
That said, I decided to put all the ballast in the nosecone, and bring the wings back a bit. There is still some disagreement over whether that will fly. But I’m trying it anyway.
In this thread
I was thinking of like launch lugs filled w/ clay but that's not enough, maybe filled w/ a section of a carpenter's nail.
But I was wondering if anyone had a better idea.
Maybe some metal war model I could kit-bash. Something from model trains or planes I could re-purpose?
AHA TIA
EDIT: CONCLUSION/TLDR:
This was a terrible idea. Guys toss around a few ideas on this in the thread below. Some tell me not to do it. I did some further work on the subject;
1. Its ridiculously dangerous.
No matter what you use as ballast (putty, metal and epoxy, whatever) by the time you pack it into an aerodynamic shape (a straw, a launch lug, a cone) and cover that in glue, and glue that to the point of a balsa fin, cover that in three coats of enamel, and fly that at 150 mph … if that’s not bullet, it is an arrow. Actually two of them!
2. And it will never fly:
According to OR, with a C engine, this thing gets 12 Gs of acceleration before it’s off the rod. Which means these 25g weights become the equivalent of 300g weights! And while they do combine to have a common CoM in the center of the rocket, individually they do not. So they are going to be pulled downward and outward (at 300 grams) during launch. If that doesn’t just rip the fins off the body tube or snap them in half, then it *must* bend them drastically, and that’s going to be steering the rocket some random direction – WITH TWO ARROWS ON THE FRONT OF IT. This was a terrible, terrible idea.
So please do not attempt.
That said, I decided to put all the ballast in the nosecone, and bring the wings back a bit. There is still some disagreement over whether that will fly. But I’m trying it anyway.
In this thread