Brian-Tampa
Active Member
Hello,
I was thinking of purchasing a 4" Black Fly kit from MAC Performance.
Their site does not have the correct RockSim file for this rocket in the 4" version. (.rkt file format)
They do have the file for the 3" version which I downloaded and loaded into RockSim.
The file is showing .33 margin for this model empty. This is severely understable.
CP = 26.6951"
CG = 25.6278"
Margin= 1.0673"
I have yet to find the correct RockSim file for the 4" Black Fly so I am hoping somebody can help me.
I have several questions regarding the 3" Black Fly RockSim file that I downloaded:
1. With this margin being so low empty, when a motor is installed won't the CG most likely move behind the CP?
2. To prevent this an awful lot of nose weight will be required to pull the CG forward far enough to be stable.
3. If there is anybody out there that has built the 4" Black Fly, what was the CG and CG empty?
4. Did you have to add nose weight to achieve an acceptable margin? And how much?
5. Does anybody have the correct Rocksim file for the 4" Black Fly? (.rkt format)
I know this may seem like a lot of questions, but I really like the 4" Black Fly and want to build it.
I was just really disturbed to see the margin on the 3" version so low.
Any help would be GREATLY appreciated!!
Thanks
Brian
I was thinking of purchasing a 4" Black Fly kit from MAC Performance.
Their site does not have the correct RockSim file for this rocket in the 4" version. (.rkt file format)
They do have the file for the 3" version which I downloaded and loaded into RockSim.
The file is showing .33 margin for this model empty. This is severely understable.
CP = 26.6951"
CG = 25.6278"
Margin= 1.0673"
I have yet to find the correct RockSim file for the 4" Black Fly so I am hoping somebody can help me.
I have several questions regarding the 3" Black Fly RockSim file that I downloaded:
1. With this margin being so low empty, when a motor is installed won't the CG most likely move behind the CP?
2. To prevent this an awful lot of nose weight will be required to pull the CG forward far enough to be stable.
3. If there is anybody out there that has built the 4" Black Fly, what was the CG and CG empty?
4. Did you have to add nose weight to achieve an acceptable margin? And how much?
5. Does anybody have the correct Rocksim file for the 4" Black Fly? (.rkt format)
I know this may seem like a lot of questions, but I really like the 4" Black Fly and want to build it.
I was just really disturbed to see the margin on the 3" version so low.
Any help would be GREATLY appreciated!!
Thanks
Brian