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  #21  
Old 03-25-2023, 07:59 AM
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HenryMac HenryMac is offline
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Quote:
Originally Posted by Earl
What is the estimated launch weight?
30.3 ounces
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  #22  
Old 04-04-2023, 08:32 AM
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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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  #23  
Old 04-04-2023, 10:40 AM
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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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  #24  
Old 04-04-2023, 10:45 AM
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Earl Earl is offline
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Quote:
Originally Posted by ghrocketman
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.


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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  #25  
Old 04-04-2023, 10:46 AM
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Quote:
Originally Posted by ghrocketman
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.

Simulation shows 42 mph off the rod. Anything over 30 mph is adequate for a successful flight.
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  #26  
Old 04-05-2023, 12:02 AM
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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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  #27  
Old 04-05-2023, 04:05 PM
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HenryMac HenryMac is offline
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Quote:
Originally Posted by Bill
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
Thanks for the post Bill.

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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  #28  
Old 04-06-2023, 11:08 AM
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Plenty 'nuf stabilization.
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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 !
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