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First flight with a stock paintjob... weathercocking is a problem with this model https://www.youtube.com/watch?v=Ls5EWFnh97w

The A10-0 is the recommended engine for the model I was flying (Blenders). With 2 good flights I knew how the rocket model should act... they fly about 100 feet up and pop the engine out. The last 2 exploded with a load boom and shot the engine out as soon as it ignited and before the model was...

clothes pin*

I had some really bad luck with my engines today. I used a pack of estes A10-0s. The first 2 flights went great but the last two blew up. It acted like the nozzles are too big... the power stage lasted only a fraction of a second with enough force to blow my close pin apart. The rocket left the...

The Atlas V uses RD-180 engines... the 170's are a more powerful 4 nozzle version of the 2 nozzle 180. Spacex's Merlin 1D which they just started using in the Falcon 9 v1.1 is a good motor but the RD-180 is a totally different beast. First off the 1D is underpowered which is why the Falcon 9...

My scratch builds are usually around c to f power and I design them to not need ballast weight in the noise. I'll work with the fin design to pull the center of pressure down instead of using ballast weight to push the center of gravity up. But when I go fashion over function I just use modeling...