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Fretted all day long yesterday and for several preceding days, I ordered parts to build an upscale Estes Sentinel about two and a half weeks ago. It will be a 2.6 inch airframe with an overall length of about 44 inches. They laser cut the eight fins for me and the tail fins have through the wall tabs. I have an Aerotech nose cone coming with the same ogive as the Sentinel kit. The nose cone is 13 inches long. Came to find out that the online rocket store I got the parts from sent them to someone else, and now that someone else is supposed to be sending them to me. I never got a tracking number so here I sit wondering where my rocket parts are. So to ease my pain of separation from wanting to build this upscale version of the Sentinel, I went to another company and bought a duplicate number of parts and some 1/8 inch thick basswood to cut fins from. Now it's a contest to see what will arrive first. Hopefully I get everything simultaneously. BTW, stickershock printed me the upscale decals already, I got two sets of them. Hope this comes to fruition soon.
 
neil_w said:
What's that spiral pattern in the second picture? Is it structural?
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jqavins said:
...Looks more than OK from here. What's the spiral for?
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Its an artifact of the print. The extruder retracted and the printer moved the nozzle radially outwards at the end of each layer. It left a little extra material. The retraction point rotates around the print on each pass, so there is a spiral ridge on the outer surface of the print. It is not continuous -- the printer rotated the retraction point by 180° at two spots, and it it turns into a more or less straight seam near tip -- where I increased the wall thickness of the model slightly.

SAM_0012.png

There is also step where the solid fill at the tip starts.
 
neil_w said:
Interesting! Looks excellent in an case.
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Thanks. I've realized that robots make me very anxious. I thought it was just the CNC routers -- because they are armed with sharp tools that can cut through steel -- but running the printer makes me clench my jaw and grind my teeth in exactly the same way that the Shapeoko does. I know people leave their homes and let printers run unattended, but I know the knucklehead who assembled this thing. I am not turning my back on it.

SAM_0015.png

jqavins said:
One hopes and expects that sanding it won't be a big deal.
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I might try to paint it, just to see if I can, but it'll fly looking like it looks now.

I am certain that these issues can be prevented. This was only the 5th or 6th print (not counting all of the aborted Ender Dragons that wouldn't stick to the bed and which disappointed my kid all weekend) and I am only just getting the faintest beginnings of a glimmer of a clue about how to make this thing work.

The cone was to try out STL export from Fusion360, to make something as tall as would fit in the build volume (22cm), and to see what the "transparent" PETG filament looked like.
 
15575276929937177864655491016008.jpg Sanded 3rd coat of primer on the 4" Pike. Last time sanding, can't get the spiral filler to lay completely flat. Sanded about 6 times total. It is what it is, time for some color.
 
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74C65BD5-E16C-417B-907C-BD577D9198CA.jpeg Bought a Estes Nike-X at the local hobby lobby. Planning on building it soon.
 
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At least 90 beers go into every one of these rockets. How do I do it? Don't worry, I had help. Anyway I show you how to recycle 24-30 pack cartons from your favorite beverage and make a rocket that always gets attention at the launch. Do it for the fun of it!
#modelrocket
https://bit.ly/beercartonrocket
 
Been going through an OpenSCAD 'virtual' build of a Nike-Ajax on this thread. The full code is presented with a 'sort of' OpenSCAD tutorial, so anyone should be able to scale it, modify it, print it. Right now it's not a 'practical' model (i.e., not flyable), but I intend to rework it to add internals for flight.
Nike_Ajax2.JPG
 
Smoke and sand, National Sport Launch at Lucerne Dry Lake, sponsored by the National Association of Rocktery and Rocketry Organization of California. Links to register below. Preview of ShotokuTech projects for the launch.
#NSL2019
https://bit.ly/stnsl2019preview
 
vcp said:
Been going through an OpenSCAD 'virtual' build of a Nike-Ajax on this thread. The full code is presented with a 'sort of' OpenSCAD tutorial, so anyone should be able to scale it, modify it, print it. Right now it's not a 'practical' model (i.e., not flyable), but I intend to rework it to add internals for flight.
View attachment 382696
Click to expand...
Heroic effort in OpenSCAD! I like OpenSCAD. But take a lot of getting used to. Congrats.
 
Epoxied fins onto 4" upscale 260 space booster (well, semi-scale; I'm not hard to please, just ask my mistress. ;))

upload_2019-5-11_17-49-45.png

Best -- Terry
Just kidding. I do rocketry. No way could I possibly have a mistress...
 
Started building my Estes Saturn V for the July 20th launch, of course I couldn't leave it stock so its getting a 24mm central with 4x18 cluster (just need one more 18/20 casing for enough (to bad I didn't jump on the HobbyLink sale, but I know where to borrow one at :) ).
 
ouisconsin rocket said:
Earned my level 1 Cert at the Tripoli MN #45 launch today.
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Big congrats!! Now you can fly higher and empty your wallet faster.... :) Welcome to L1.

Tobor said:
Today I ordered an AT J250FJ-L from Wildman for my L2 Cert at MMWP. My Goblin sims to 4.2K+ ft. (1st cert choice) and my ****** RIM-66 sims to 5.4K+ ft. (2nd cert choice). I was considering ordering an AT J401FJ-L rather then the J250 but I chickened out at the last moment. The RIM-66 sims to 7.6K ft and that alt. scares me a bit. Maybe I'll man up and fly the J401 later this summer...
Click to expand...

Well looks like I screwed up. I thought the WM site was acting wonky (it was but not in the way I had assumed) so I emailed in my order. Turns out WM is out of stock on the J250. Same goes for most of the other 54mm reloads.

Anyhoot WM does have one smokey in stock, an AT K513FJ-L. So I grew a pair and pulled the trigger.

Btw, with that motor, the RIM-66 sims to 8,500+ ft @ 1.29 Mach.... :eek:
 
Successfully flew my L1 on my first attempt yesterday @ Tripoli mid-Ohio. Mach 1 Alien Interceptor on H97, stratologgerCF with rocketman streamer for drogue and a thin-mil topflight main. I owe a big shoutout to the forum and all you crazy rocket people for helping me waste countless hours learning anything and everything I needed to know about this new found addiction. See you on the flight line!IMG_2187.jpg
 

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