#1
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Staging clustered engines to a single engine
The Fat Boy thread got me thinking. If one wished to do a model like this, but wanted to have a two engine cluster in the lower stage, would a two engine cluster in the booster reliably ignite a single engine in the sustainer? If the engines are not directly in line, will that prevent staged ignition? Would some kind of reverse reducer be necessary in the booster to funnel the burning particles up into the sustainer? I'm just kind of thinking out loud here.
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"AND I hope they are from the planet of the "Chunk spunky Mary-Lou Retton clones". - Ironnerd "Those who trade liberty for security have neither" - Benjamin Franklin "Semroc is almost always the answer" - Stefanj www.paulsavia.com www.soundclick.com/paulsavia |
#2
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With the motors side by side with a bit of distance I would think so. If the motors were angled in so that they are aimed at the sustainer, that would work also. A reducer or funnel would have to be pretty heavy duty and/or have a removable shield or else it will get torched pretty quick.
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#3
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I've seen this done.
A guy named Dale in Oregon Rocketry made a sturdy-looking two stager. BT-70 or BT-80, not terribly long. "Alpha" shaped fins. The booster had two D motors, with simple ductwork to get the sparks up to the single upper stage nozzle. It has been a few years since I saw it, but I seem to recall that it had a hatch for the parachute on the side of the booster. When the booster separated that hatch was free to flop open. |
#4
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You know, I really like the idea of the angled engines on the booster section. That would even help in the event that only one engine lights, keeping the thrust through the rockets CG. Great idea. I'm starting to get the "experimentation bug" now!
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"AND I hope they are from the planet of the "Chunk spunky Mary-Lou Retton clones". - Ironnerd "Those who trade liberty for security have neither" - Benjamin Franklin "Semroc is almost always the answer" - Stefanj www.paulsavia.com www.soundclick.com/paulsavia |
#5
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A rocketeer named Jason Toft did something very similar for a design on the month entry at FlisKits. You can find his entry by clicking this link.
His Sandhawk has a 3 motor cluster, but one motor was used for recovery deployment while the two other motors were used for sustainer ignition.
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#6
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A member of our club does it. Channels three engines to the single upper stage using the "funnel" technique. Coats it with medium grade CA. Works pretty good too.
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