#21
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Quote:
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John Simmons a.k.a. "Lakeroadster" NAR 113985 My Fleet with Build Data: Lakeroadster's Rocket Shop |
#22
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Working on wrapping up the final items that still need to be built.
The 3rd stage streamer needs to be protected from the 4th stage motor when it ignites and staging occurs. On the 1st and 2nd stages I built recovery spools using home made basswood plywood. For this stage I decided to try using corrugated cardboard instead of basswood. This worked really well and the corrugated cardboard stiffened up really well once I coated it with Gorilla Wood Glue. The spool is attached to the 4th stage via (2) pieces of Kevlar. The kevlar is taped to the inside bore of the 4th stage. The idea is the spool will be pulled out of the 3rd stage, and then the kevlar will be pulled loose from the 4th stage. Kind of a non-traditional approach. Worst case scenario the 3rd and 4th stage streamers get tangled and come down together.
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John Simmons a.k.a. "Lakeroadster" NAR 113985 My Fleet with Build Data: Lakeroadster's Rocket Shop |
#23
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At almost 2lb mass, you better use plenty of power in that first stage.
Like 4 Quest D motors. Minimum 4 Estes C5 (NOT C6) motors.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#24
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He does. From Post #2: "The first stage has (2) D12-0 motors and (3) C11-3 motors." I thought that was kinda on the 'juicy' side early on until I asked him how much the whole stack weighed. Then the booster cluster seemed more appropriate. Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#25
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Simulation shows 42 mph off the rod. Anything over 30 mph is adequate for a successful flight.
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John Simmons a.k.a. "Lakeroadster" NAR 113985 My Fleet with Build Data: Lakeroadster's Rocket Shop |
#26
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How are you stabilizing the second stage? Some people use flip-out fins.
Someone flew a three-stage Saturn V at a NARAM some years ago (46?) The second-third stage adapter was the base of his "second" stage and the LM adapter the base of his "third" stage. He did not need any additional fins. It was an impressive flight, but I managed to get pictures of it in action and could barely make out the unconventional stage separation points. Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#27
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The 1st stage fins are canted 15 degrees, which induces spin stabilization And if I understand your explanation of the rocket configuration at NARAM, my design is similar. The attachment below shows the configuration of my Saturn V. Every stage benefits from base drag stabilization. Open Rocket Simulations show the rocket is stable from launch to apogee.
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John Simmons a.k.a. "Lakeroadster" NAR 113985 My Fleet with Build Data: Lakeroadster's Rocket Shop |
#28
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Plenty 'nuf stabilization.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
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