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Discussion in 'High Power Rocketry (HPR)' started by Rail Dawg, Nov 30, 2018.
That looks fantastic!!!
I’m probably biased but when I first saw the rocket in the paint shop I was very impressed with the red color. The silver nosecone and switch band is a great matchup too. It’s not easy choosing colors out of a book lol.
It turned out much better than I imagined. And the clear coat on top is outstanding.
Appreciate the kind words.
Chuck , how did you reinforce the inside of the nose cone ? Did I miss the post?
Hey you’re paying attention. Well done!
I filled the inside of the tip with epoxy and glass fibers for strength. But the rest of the reinforcement hasn’t been done yet. Am going to simply lay a couple layers of glass on the inside and install the bulkplate to hold the GPS.
The paint shop filled in the groove that was at the tip and made it darn near perfect. Very pleased.
I do plan on bringing some tools and supplies to the launch to work on the final items. Not a bad place to work on a rocket right?
Chuck, please try to get as much as is humanly possible done before going to the launch site. It is much more comfortable working in your nice barn, with necessary tools and materials at hand, than scrounging for stuff at the launch site. Makes for a more social launch with less stress. It also allows time there for unanticipated SNAFUs (unknown unknowns ), which are more abundant on the bigger projects. YMMV.
Sage advice. Knowing the KloudBusters it’s going to be a very busy (and fun) few days out there.
Have chased almost every hurricane for the past 20+ years. It's a long story not going to bore you lol.
Was within 2 miles of the eye of Michael last year in Panama City, FL. My first Cat 5 with gusts to 185mph.
Before flying I was a hurricane forecaster and I guess it's still in my blood. Parking lot garages are where I make my stand. Above the storm surge and the stairwells offer bulletproof protection. Afterwards I help those trapped and in need.
That being said Hurricane Dorian has my attention. My initial gut is we may see a Cat 5 on this one. There's nothing in the way of synoptics to stop this thing. It's too early to call but for me to get on here and post means the internal radar isn't liking what I'm seeing.
If it goes major I'll be heading from Houston into the gauntlet. Will need to leave LDRS Friday afternoon, drop off the rocket in Houston, reload the truck and head to Florida.
Ready for the usual wise-cracks and naysayers lol. But have never had a problem and don't anticipate any this time. It's one heck of an adventure if you know what you're doing.
Prepare early in Florida. Within a day or so there won't be any supplies.
Raise a glass to the Cajun Navy! [I know you're a bit west and inland to be Cajun, but you get the drift. ]
And thank you for the gut feel level warning.
For Harvey I joined the Cajun Navy and rescued over 150 people in my 23 ft swamp boat.
Including my parents lol. My dad wouldn't listen when I said to get out...
OK . . . That makes sense.
I don't think that part of the airframe was discussed, in any detail, before.
I will be there, "in spirit" . . . It's impossible for me to be able to attend.
Have a safe trip !
I always knew you were nuts Chuck, just unsure of how much until now.
Years ago, when I lived in Tornado Alley (Tx Panhandle), I was a tornado chaser. I even introduced one
of my daughters to a fellow chaser from Australia. She dang near married him.
I was always easy to spot as a chaser driving around. I was in vehicles with smashed windows and beat up roof and hood.
One of the funnest times was chasing one by Friona, Texas. I had to dash under what I thought was a pretty substantial truck wash when I miscalculated nader direction. When the freight train noise was over, the wash roof was gone. And the drive home was, ahhhh, breezy, as the galv pipe water line speared thru the back window and out the front windshield.
At least I had the sense to lay down in the front seat.
"Helps transfer thrust from thrust plate to fin can."
Wow, this really is a "kitchen sink" rocket....toss everything in you can think of regardless if it makes sense.
For a 10-second burn? Heat transfer from something around the motor to the fins? What heat?
Sounds like you added mass to the ass for no good reason.
Any SCIENCE behind this????
It would be like a thrust ring to keep the fin can in place Richard
Hi Fred pulling into the Rocket Pasture.
Come take a look!
How nice of you to chime in, 2,353 posts into an 8-month long thread . . . Clearly, your "expertise" could have resulted in so many vast improvements and the project would, undoubtedly, have been so much more impressive, if you had joined in from the inception ( SARCASM ).
As you may have gathered, the abrasive nature of your post was not universally embraced with open arms. "Rewind" and try again, in a more "civil tone".
I went to Disney World for Irma in 2017
I had never been in a hurricane. Disney Contemporary is probably world’s nicest shelter.
Genuinely curious: who mentioned anything about heat transfer?
Long ago in this thread I happily donated NACA 4197TN flutter analysis alongside Dave optimizing fin geometry. I also as a mechanical engineer graduate donated compressible gas dynamics analysis of shockwaves total temperatures across the shocks at nosecone and fin leading edges.
In essence heat will transfer from the chemical reaction of burning propellant to motor casing to body tube of rocket to fincan by conductive heat transfer. You can apply a thermal analysis from insulated multiple layer pipes if you want with the various materials having different thermal conductivity coefficients.
There is also convective heat transfer from air friction to the surface of the rocket, aero heating, which frankly I was more concerned about than others on this forum. All I can say is I donated some compressible flow analysis to the best of my abilities. This is more complex than pipe heat transfer problems. It applies a NASA math theory based on temperatures across shockwaves while supersonic good enough for actual hypersonic spacecraft design earth re-entry at Mach 25. Finding the maximum total temperature is as simple as a few lines of algebra and a core conceptual grasp of compressible flow from college level courses on advanced fluid dynamics as supersonic flow is not behavioral as lower Mach turbulent or laminar flow.
In college level mechanical engineering heat transfer classes they teach how to find heat transfer rates at points in structures for example slender rods or beams or walls. However a rocket nosecone is of complex geometry and there are no known algebraic methods of analysis that I know of at my skill level as a new mechanical engineer without throwing a thermal analysis software package at it which I sadly lack at the moment to say find a time when the rocket heats to predicted total temperature and where within the structure specifically.
I design conveyors professionally now. Fred maybe overlooking other factors such as stability margin, center of gravity, and center of pressure shifts may have lead the designer to put more mass in the ass end of rocket. Maybe they are trying to structurally accomplish a certain safety factor with thrust loads and internal force reactions on the inside of airframe at joints? Maybe the builder and team lacked analysis in certain areas of the project and desired to stiffen up areas of doubt.
For a “Kitchen Sink Rocket” insult. He can kindly F*** Off and next time Chuck builds a bigger S class rocket after learning from this one, maybe Fred should offer better advice earlier in an “Open Source Forum” project. There was one other engineer by name of Bob who had better advice of thermal analysis through his techniques buried somewhere in thread. Sadly I don’t think he contributed any kind of numerical thermal analysis. What is the point of this rambling??? Sarcastic people piss me off. I hope Fred is kidding around asking what heat? I mean it’s not going to stay at room temperature while at Mach 2. Fred you are way late to the party. Not my first supersonic rocket project either.
Anyways Neil I hope I answered your question.
.... a little birdy told me there is a another candy apple red rocket at LDRS.... pics side by side?
I finally got to see this beast today and it is just that, a beast!!! Good job chuck. If were a kitchen sink I would drive down to Lowe’s and get two
what the hell?
kitchen sink rocket?
any science behind this?
this reminds me-
kids, DONT SMOKE CRACK!
Welcome back, sir . . . Great to hear from you again !
This rocket is a beast!! It was a pleasure to meet you chuck!
no doubt shes gonna look pretty heading into the sky!
and guys, dont feed the trolls
haters gonna hate
Best reply to date.
Polite. Personal. Relevant. Call to Action.
Inigo Montoya said it better - but only by a smidgen.
Where's the motor? Is it going to fly some day?
BTW, you should not transfer thrust into the fin can. The aft ring should only support the fin can.
Somebody please get quality launch pics on boost and maybe a video uploaded to TRF when it flies? That’s all I really ask for nicely. Thank you.
Did they actually clear it for flight at LDRS? I might have missed something in the noise
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