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Model Forum / General / Rockets / March 2008Ducted Rocket I'm Going For It
Trying to find information on air breather model rockets. I saw a post that mentioned Bill Wood and Jerry Irvine. Anyone have information on these past experiments. I'm designing a ducted "ejector" rocket which entrains air at launch under composite power then transitions to solid fuel and ram air. Small motor transitions to larger solid plastic fueled ducted rocket. It can transition back to hybrid at 100K AGL. > Trying to find information on air breather model rockets. I saw a post > that mentioned Bill Wood and Jerry Irvine. Anyone have information on > these past experiments. I'm designing a ducted "ejector" rocket which > entrains air at launch under composite power then transitions to solid > fuel and ram air. Small motor transitions to larger solid plastic > fueled ducted rocket. It can transition back to hybrid at 100K AGL. Good luck with this project. Your description is somewhat confusing though. At launch, there is zero air flow. You need a booster to get the "system" up and running so you have adequate air flow. I've seen literature describing fuel-rich mixtures that have the exhaust ducted and "re-burned" in a ram jet. Your intent to get to 100,000 feet above the ground is admirable, and then to stage to a hybrid system is going to be a feat that it lofty (pun intended) as well. Please keep us informed of your progress. At launch, there is zero air flow. You need a booster to get the >"system" up and running so you have adequate air flow. I plan to start with a quick burn G series motor to get up to 250 mph. The G motor is mounted in the center inlet Spike above the hollow core plastic fuel grain. Keep in mind firing of the G motor will entrain atmospheric air even at zero velocity (ejector ramjet). The G motor will ignite the plastic fuel core and combine with compressed atmospheric air from the diffuser section. The trick will be to balance the surface area of the burning plastic fuel grain core to mass flow from the inlet to maintain a reasonable air/fuel mix. I’ve been experimenting to test krushnick effect on the recessed G motor burn. Seems to be minimized by entrained inlet air flow through the duct and fuel core. |
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