Edited, overcome by events.Showing the side profile. Note that disk #9 is shown to the left, but NOT glued to the Nose. #9 is used for alignment.View attachment 402082
View attachment 402083
I don't know if anyone mentioned this, but if you add a skin (Monokote) to this design, then all bets are off as to where the CP will be. There's a lot of induced drag being created by having those centering rings open to the air in flight. Covering them will change the CP location. Where? Probably forward, but that's just a guess.
Good Luck!
That technique doesn't work so well for rockets of this shape. The Estes Tech Report was written years ago and is a bit simplistic in its assumptions for anything that doesn't look like a typical Estes kit. It especially doesn't take rockets of this profile in to account. Open Rocket or RockSim would provide a better estimate.I *hate* to be contrarian, but...the CP is not a great unknowable quantity. The easiest way to calculate the CP of a rocket is to make a cardboard cutout of the silhouette of the rocket and find the balance point. It's probably in one of the Estes Technical Manuals about how to do this. Here's what NASA says - https://www.grc.nasa.gov/WWW/k-12/VirtualAero/BottleRocket/airplane/rktcp.html
edit Estes Technical Report TR-1 "Rocket Stability". https://estesrockets.com/wp-content/uploads/Educator/2845_Classic_Collection_TR-TN.pdf
Don't think so. Second picture shows a fireball and flaming bits of motor.Could this be a motor mount failure, where motor just went straight up through the rocket and kept going?
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