#1
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With a classic K-11 clone comes a WAC Corporal
The WAC Corporal is a pretty straight forward build. A nose, a body, a block, a lug, a leash, and a chute.
As this is a clone, or a copy, or a scratch build, I started by making the parts. This time, I used a balsa nose, not a cast nose cone. Don't know why, it's what I decided at the spur of a moment. (Where do moments wear their spurs?) |
#2
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One of the distinguishing parts of the WAC Corporal, and perhaps the most challenging part of the build, is the bevel on the fins. It should be pretty consistent and sharp, otherwise it looks sloppy. Not much of a middle ground on these fins.
So, I put tape on the fins to form the edge of where I should be sanding, and then carefully removed the bevel with sandpaper laid flat on my work surface. |
#3
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It's a minimum-diameter rocket so there's just an engine block shoved about 2 1/2" (or, if you use metric, it's still 2 1/2") into the body tube.
There's no motor clip, so yay, tape retention. Three fins get held in place. I think the instructions called for 1/32" fins since it was BFS-10A, but I used 1/8". It's not really scale, and I wanted the bevels to be more noticeable. |
#4
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Man, those guides are slick! I need to get a set...........
Please PM me if you will ship a set to Canada. Joe |
#5
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David,
The WAC was my first rocket so it will be fun to watch your build. Your fin guides have been used at various rocket programs at the Museum of Flight with great success. A great innovation! Pat
__________________
National Collection Images: G. Harry Stine Collection/The Museum of Flight. |
#6
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Quote:
The die-cut fin on my WAC Corporal kit that I built in the late 1970s were made from 1/16" balsa. The 1/32" balsa was only used on the fairing strips on the launch lug/simulated wiring tunnel. Kits that had die-cut fins had a parts designation of BF-xx, where xx is the kit number that the sheet belongs to. Some research is required to determine the balsa thickness on a particular die-cut sheet.
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'Til next time, Mike Toelle NAR 31692 L1 SAM 0373 |
#7
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Quote:
Dang my eyes suck. I went back and read the instructions for the WAC Corporal. There is (6) Balsa Stock, BFS-10A. Then right below that is (7) Die-cut Balsa, BF-11. I read (6), skipped (7), and thought 1/32" fins is just too small for fins. Oh well, if I do this one again, I'll know. Thanks. Quote:
I was glad to help out with the builds that you guys are doing at the MoF in Seattle. And, it's a cool exhibit of model rockets. Let me know if I can be of help again. Quote:
Back to the WAC. The instructions call for two nose weights of NCW-1. Well, that's not a unit of mass that I learned in Physics. So, researching NCW-1,I found comments that it is 5.25g or 0.185oz (thanks micromeister) (Edit: I originally misquoted micromeister by typing 1.85 oz, not 0.185 oz. I fixed it for future reference. I should have noticed that an additional 1.85 oz lead weight is not a small amount for model rockets. D'oh again.) With a hammer and fishing weights, I fashioned some with a similar weight, in ounces, or mass, in grams. Last edited by DavidQ : 05-27-2018 at 08:32 PM. |
#8
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Then, with primer and paints, the WAC became yellow and black.
I made the stripes by narrowly slicing some adhesive vinyl sheet I bought at the local hobby store. |
#9
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I see your shock cord installation is according to the original old instructions. Cool!
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#10
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According to the 1970 Estes catalog, the NCW-1 lead Nose Cone Weights
weighed, 0.12 oz. In post #7, your decimal point might be one off.
__________________
Hans "Chris" Michielssen Old/New NAR # 19086 SR www.oddlrockets.com www.modelrocketbuilding.blogspot.com http://www.nar.org/educational-reso...ing-techniques/ Your results may vary "Nose cones roll, be careful with that." Every spaceman needs a ray gun. Look out - I'm the Meister Shyster! |
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