Model Rocket Building Blog
Engine Marking - TIPWith an engine installed you might have to guess what was prepped a month earlier. Normally I mark the paper igniter retainer with the engine designation. If an engine was friction fitted it's hard to pull it out and check it. This engine is obviously a B6-4. The "E" stands for Estes made, the "X" ...[Read More]
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![Vintage Estes Viper #0820 Model Rocket [4*G-17.25]](https://i.ebayimg.com/thumbs/images/g/Q7EAAOSwN1Nl1kDF/s-l225.jpg "Vintage Estes Viper #0820 Model Rocket [4*G-17.25]")
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