Discussion in 'High Power Rocketry (HPR)' started by Rail Dawg, Nov 30, 2018.
"Overkill" does not exist, when strength & safety are the "prime focus" !
"Adapt & Overcome . . . Failure is not an option" !
Very good advice Eric.
No doubt. My suggestion was more a way to make construction easier (and possibly more complete as it will be easier to glass outside the airframe) not a way to make it “weaker.”
I do see your point.
Each coupler assembly will be put together outside of the rocket. This will make it easy to glass the stringers.
Once the coupler assemblies are complete each one will be slid into place inside the airframe. I've got a standing belt sander to ensure the assembly will slide into the airframe with no problem even with the epoxy.
Doing it this way is going to make for a very strong airframe both internally and externally.
I did give your idea some thought but am going to stick with the current plan.
If it's a single axle trailer with jack's on the 4 corners it wouldn't be a big deal.....you wouldn't want it sitting on the tires when you launch anyway...
A simple 12v power pack could easily handle this.
Another way to accomplish the same goal would be to have a pure flatbed trailer that's a little narrower than road legal and have the pad straddle it with 4 jacks. When you get to the launch site, jack up the launch pad clear of the trailer and roll the trailer out from underneath.
Yes having that would make it far easier.
That may not be a bad idea. I like it.
Thanks to a top-notch motor team the casing and hardware are coming together nicely.
A couple of minor roadblocks but that is expected.
Am very lucky to have two of the best in the country to help build the motor.
I can start on CR's and stringers now that all the right tools are in place. Once the airframe and couplers start arriving I'll begin posting posting pics of the build.
I don't think it will take too long to build this rocket once all the parts are in. I've got a pretty firm plan and it should go smoothly unless I screw something up lol.
Looking forward to seeing how a really big rocket goes together!
The "Steely-Eyed Missile Men" of the Support Team have your back . . .
Adapt & Overcome . . . Failure is NOT an option !
PS - Reciting Alan Shepard's Prayer may be beneficial :
One of my favorite lines in The Right Stuff.
They filmed the carrier scenes on the USS Coral Sea (CV-43) while I was on it. Turned out to be a great movie didn't it?
OK we've got our trailer/launch pad man selected. Levi Seaton is on this forum and after talking with him Levi looks to be a good choice for this important job of construction.
We discussed using a 24' trailer that will be outfitted with the cradles for hauling the rocket. That and the launch rail on a radio tower type of support for the 20' long rail. The rail will be one piece with no gaps or seams.
Outriggers and jacks for stabilization. 12V electric actuator for the lift. We'll simply remove the tires if required.
We both agreed to put this info out on the forum so others can continue to provide ideas on what would make it better.
Having seen big projects fail just because of a bad pad/rail design we want to nail this down.
The Right Stuff is one of my favorites, as is Apollo 13 ( you probably already knew that - LOL ! )
Here's a pic of the Rohn Radio Tower hardware we'll be using for the launch pad. It's going to be 30' of Unistrut attached with a backer plate to this 30' tower:
is Jim making the casing and closures?
Now you've gone and done it! D'oh!
Here it comes . . . Serious hardware !
No he’s not... I think Jim is finally retired and not doing this type of thing anymore.
I’ve got the 8 1/2’ motor casing/closures and nozzle that he built sitting in the rocket shed. Unfortunately because the casing has a seam it’s not worth the risk of trying to fly it in this rocket.
curious who is making the new casing, very few with the capabilities to make big casings
Hmm . . . Knowing how Chuck thinks, it might be THIOKOL . . . LOL !
HA!!!! That was great!!
OK here's 30' of galvanized steel radio tower on it's way to the rocket shed.
Levi Seaton is an accomplished welder and will be taking on the big job of converting a 20' lowboy trailer into a most-awesome mobile launch pad.
Is Levi a "Steely-Eyed Missile Man" ?
I can not thank chuck enough for letting me be apart of this. I plan to give chuck something I’m proud to have my name on.
Obviously it's your choice, but you don't have to dismiss this case just because it 'has a seam'. A simple hydrostatic proof test would tell you if it is usable or not. They you can use it or dispose of it as seems appropriate.
I have a complete 6 inch case that I was given that truly is 'not worth the risk' because the threads are so loose they can engage normally or cross threaded with equal ease [and without damage]. However it makes a handy mandrel sometimes, so I hang onto it.
Welcome to the "Program" . . . "You , sir, are a Steely-Eyed Missile Man" !
Speaking of RECOVERY . . . Here is an interesting concept that might bear further investigation .
I am envisioning bringing the "ARR" down in TWO pieces ( AFTER Drogue Deployment ), each equipped with something similar to the above.
It would allow for the use of smaller parachutes, also.
Separate names with a comma.