Meatball 1
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I see the weld bead now that is mentioned in the M5 drawing.
Gotta love weld beads. https://www.meatballrocketry.com/samples/NikeM5E1.jpg
I see the weld bead now that is mentioned in the M5 drawing.
Nice modeling work Josh. What CAD package do you use?
Greg
Bumping this old thread to show the fruits of my labor...this was a ~40 year old Centuri kit...I replaced the balsa fins with built-up paper fins--hopefully I get to fly this pretty soon!
I started the display stand when I was 13, but never attached it to a base. I had just received an Xacto "strip cutter" and went nuts cutting balsa strips to make the "I" beams. After gluing it together, it layed around in my balsa nose cone box until I started building the NS. So its sorta fitting, an old display stand to go along with the old bird...
Thanks to the folks on this thread that helped me with the NS fin dimensions and other details...this model is not a "detail scale" so I did not use all the info, but some day...
Just one last question. There are some large bolts(?) between the fins near the forward edge of the fin shroud. They're at the same level as the launch lug bolts, so it's certain that they bolt into the aft M5 flange. Shown here:
View attachment 370303
So I'm lacking any guess at the diameter of those, their angular positions, and if they appear in the other quadrants. I'll be making a best guess. The bottom 'bolt' in that pic really doesn't look like a bolt - more like it has a hollow in the center or something (or maybe the paint is just scraped off).
I am getting ready to build my Centuri Nike Smoke kit (its been open since the 70s, I just never got around to it). I plan to use built-up fins, rather than carve out solid balsa fins. I like to model these parts in SolidWorks to create the flat patterns.
I was looking through my data and cannot find the dimensions of the bevels on the fins. I have G.H. Stine's drawing from the Oct 69 Model Rocketry, and ROTW. I scanned the MRm drawing and was measuring the fins when I found there appears to be a difference between the forward bevel (towards the nose) and the aft bevel (about 0.25 inch). I always thought they were symmetrical. The ROTW drawing looks like they are symmetrical. The Centuri instructions give the same dimension FWD and AFT.
I started searching the web (and the forums) and can't find any data about this. I have seen several reports that the Stine drawing has some errors (nobody points out what they are!). On the scaleroc group there is a thread about Nike Smoke dimensions, and people offering some drawings, but the date on the thread is 1999. I saw on scaleroc mention of some data on NARTS, but I can't find mention of it on the NARTS site.
Does anybody here have good dimensional drawings of the Nike Smoke fins? Could you post scans?
As I model this w/ the CAD, I find another issue. If I use the dimensions scaled from the Stine drawing, the fin bevels have a warp (or twist) in them (I produced it by drawing the root profile and the tip profile, then lofting the profiles along the leading edge of the fin). The head-on profile looks like the 2D drawing, but I am not sure the real fin has a twist. If I cut the fin with a flat plane, then the head on view does not match the 2D drawing.
I have posted some images showing the comparisons. Those dark images are a SolidWorks plot of the surface curvature--if it is solid black, the surface is flat. The colored area show the twist.
So, does anybody know if the fin has that twist? I am guessing the fin is hollow, with sheet metal skins, which could be forced into a twist, I guess. If the fins are solid, I would guess the surface is milled flat and the 2D views are off.
The pics Micromeister posted https://www.rocketryforum.com/showthread.php?t=2076 aren't quite clear enough to see the bevel details.
I know, I am probably over thinking all this, but now curiosity is killing me!
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