mh9162013
Well-Known Member
I'm building my first fiberglass model rocket, and I'm pretty sure that it's gonna need some nose weight. I hate to add non-functional weight, but I have no choice. The only real question is how much weight to add.
I'm using Open Rocket to try and figure out how much weight to add, but I have a few questions/issues that I'm hoping I can get some help with.
First, where can I get an estimated weight/mass of my rocket? Open Rocket says my rocket is 18 grams without the motors, which is very, very wrong. And when I change a component from say, cardboard to steel, the weight of the rocket stays the same. I don't understand what's going on here.
Second, I'm getting a warning in the lower right that says "Discontinuy in rocket body diameter." What does that mean?
Third, I'm adding a mass component to the top of the rocket, just below the nose cone. But after doing that, the CG remains unchanged.
If it matters, I created my sim by opening an Alpha III rocket .ork file, then adjusted the existing components, ie lengthening the main body tube, changing the main body tube's material to fiber glass, adjusting lengths and thicknesses of the components, adding a 4th fin, etc.
I'm using Open Rocket to try and figure out how much weight to add, but I have a few questions/issues that I'm hoping I can get some help with.
First, where can I get an estimated weight/mass of my rocket? Open Rocket says my rocket is 18 grams without the motors, which is very, very wrong. And when I change a component from say, cardboard to steel, the weight of the rocket stays the same. I don't understand what's going on here.
Second, I'm getting a warning in the lower right that says "Discontinuy in rocket body diameter." What does that mean?
Third, I'm adding a mass component to the top of the rocket, just below the nose cone. But after doing that, the CG remains unchanged.
If it matters, I created my sim by opening an Alpha III rocket .ork file, then adjusted the existing components, ie lengthening the main body tube, changing the main body tube's material to fiber glass, adjusting lengths and thicknesses of the components, adding a 4th fin, etc.