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Rodney Earp's 222 (Scratch built 2 stage)

This is a 2 stage rocket design of my own all made from 3” Blue tube. The First stage booster has two 29 mm engines and the 2nd stage has a 38mm engine.   It’s duel deployment running a Raven 3 with a RockeTiltometer , all that in a 3” tube is a lot but can be done by using both sides of the sled.  This is quite the most complex rocket by far I’ve built. I’m finding out that  Rocksim is having a hard time with the booster. When unloading one engine it still shows me the results as if both were loaded and I can’t get a good feel for what loads would be safe if 1 didn’t light. I Finally decided that I’ll use 2 CTI G250 two grain VMAX motors in the booster and  Aerotech H245 in the second stage. I’m going to fly it without the booster first with a I218R to make sure it flies straight and we’ll go from there. Pucker factor should be high!


This is my first flame job and I was very happy with it, not bad to be done with spray can paint! I think it will look really hot on the pad!


Weight Dry W/booster - 86 oz.

Weight Dry W/O booster - 72 oz.


More to come!


2 stage Cluster Rocksim Design File

Designer: Rodney Earp

Download 2 stage take 2.rkt

To use the design file above, you need Rocksim which is avaliable from Apogee's website.

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