Thanks, I thought so but I needed confirmation.CP is based on the flying configuration of the rocket. So yes, the motor needs to be accounted for.
CP is based on the flying configuration of the rocket. So yes, the motor needs to be accounted for.
Thanks, I thought so but I needed confirmation.
OK I received two different replies. Thank you both.The Cp is the center of aerodynamic pressure. The Cp calculations take into consideration the parts of the rocket that touch the air. Because the motor is inside the rocket, it doesn’t affect the Cp. All OR really needs to calculate the Cp is the nosecone, body tubes, fins, or other parts on the outside of the rocket. You don’t need to specify a motor, motor tube, centering rings, parachute, or anything else inside the rocket and you don’t need to have any of the weights correct. All of that is important for Cg, but not for Cp.
OK I received two different replies. Thank you both.
So if I am getting the gist of this, I use OP with a the motor for my Cg and without for my Cp. Or can i leave the motor accounted for and use the caluated Cg since it should only use the exposed rocket parts.
Al
OK I received two different replies. Thank you both.
So if I am getting the gist of this, I use OP with a the motor for my Cg and without for my Cp. Or can i leave the motor accounted for and use the caluated Cg since it should only use the exposed rocket parts.
Al
Motor nozzle sure does hang outside of the rocket, on many I see.
It does not.Do you think OR takes into consideration motor nozzles?
It does not.
CP: Motor does not matter
CG: Always include motor to get a real stability estimate
Unless part of it sticks out the bottom of the rocket...right?CP: Motor does not matter
OpenRocket does not factor that in. You’ll notice that the CP doesn’t change when you change motor configuration.Unless part of it sticks out the bottom of the rocket...right?
Motor overhang doesn't make a significant difference to CP, so OR doesn't worry about it.Do you think OR takes into consideration motor nozzles?
Motor overhang doesn't make a significant difference to CP, so OR doesn't worry about it.
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