View Single Post
  #10  
Old 01-30-2019, 12:42 AM
teflonrocketry1's Avatar
teflonrocketry1 teflonrocketry1 is offline
Craftsman
 
Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 264
Default

Attached are my preliminary simulations for the Estes Saturn V, K-36, 1/100th scale with and without the plastic fins. I still need to size and place the body wraps better and include the electrical, pressurization and systems tunnels as well as all the other surface details.

CP with plastic fins is 32.903", stability margin with 3 x C6-3 motors 1.06, altitude 183' AGL. CP with just the balsa fins is 29.770", stability margin with 3 x C6-3 motors 0.52, altitude 208' AGL. Although this suggests that the clear plastic fins might be needed for flight stability RockSim gives a stable flight in 7mph winds with just the balsa fins.

Again I simulated the engine shrouds as one transition section of the same length and overall base diameter. You should be able to open and use these files with Open Rocket freeware http://openrocket.info/.
Attached Files
File Type: rkt oop_estes_Saturn_V_K36_Balsa_Fins_Only.rkt (106.2 KB, 39 views)
File Type: rkt oop_estes_Saturn_V_K36 Plastic Fins Only.rkt (106.2 KB, 28 views)
__________________
Bruce S. Levison, NAR #69055
Reply With Quote