Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Projects
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-25-2018, 09:14 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 375
Default 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?)
Attached Thumbnails
Click image for larger version

Name:  wac parts.jpg
Views: 35
Size:  141.3 KB  
Reply With Quote
  #2  
Old 05-25-2018, 09:17 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 375
Default

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.
Attached Thumbnails
Click image for larger version

Name:  sanding leading edge.jpg
Views: 40
Size:  190.9 KB  
Reply With Quote
  #3  
Old 05-25-2018, 09:27 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 375
Default

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.
Attached Thumbnails
Click image for larger version

Name:  wac fins.jpg
Views: 69
Size:  103.0 KB  
Reply With Quote
  #4  
Old 05-26-2018, 07:06 AM
mojo1986's Avatar
mojo1986 mojo1986 is offline
Old Canuck Modeller
 
Join Date: Mar 2005
Location: Kingston, CANADA
Posts: 2,160
Default

Man, those guides are slick! I need to get a set...........

Please PM me if you will ship a set to Canada.


Joe
Reply With Quote
  #5  
Old 05-26-2018, 09:31 AM
pterodactyl's Avatar
pterodactyl pterodactyl is offline
Opinions mine; not of NAR or MOF!
 
Join Date: May 2007
Posts: 265
Default

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.
Reply With Quote
  #6  
Old 05-26-2018, 03:47 PM
mwtoelle's Avatar
mwtoelle mwtoelle is offline
Flying since 1977
 
Join Date: Oct 2010
Location: Middle TN
Posts: 452
Default

Quote:
Originally Posted by DavidQ
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.

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.
__________________
'Til next time,

Mike Toelle

NAR 31692 L1

SAM 0373
Reply With Quote
  #7  
Old 05-26-2018, 04:52 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 375
Default

Quote:
Originally Posted by mwtoelle
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. .

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:
Originally Posted by pterodactyl
Your fin guides have been used at various rocket programs at the Museum of Flight with great success. A great innovation!

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:
Originally Posted by mojo1986
Please PM me if you will ship a set to Canada.
Canada is fine. It just takes a few days to get past the border.


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.
Attached Thumbnails
Click image for larger version

Name:  wac nose weight.jpg
Views: 40
Size:  98.7 KB  

Last edited by DavidQ : 05-27-2018 at 08:32 PM.
Reply With Quote
  #8  
Old 05-26-2018, 04:55 PM
DavidQ DavidQ is offline
Craftsman
 
Join Date: Aug 2011
Location: Washougal Washington
Posts: 375
Default

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.
Attached Thumbnails
Click image for larger version

Name:  wac finished.jpg
Views: 68
Size:  52.6 KB  
Reply With Quote
  #9  
Old 05-26-2018, 08:37 PM
mojo1986's Avatar
mojo1986 mojo1986 is offline
Old Canuck Modeller
 
Join Date: Mar 2005
Location: Kingston, CANADA
Posts: 2,160
Default

I see your shock cord installation is according to the original old instructions. Cool!
Reply With Quote
  #10  
Old 05-27-2018, 10:28 AM
hcmbanjo's Avatar
hcmbanjo hcmbanjo is offline
When Pigs Fly!
 
Join Date: Sep 2005
Location: Orlando, FL
Posts: 1,102
Default

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.
Attached Thumbnails
Click image for larger version

Name:  Lead Weight.JPG
Views: 34
Size:  53.0 KB  
__________________
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!
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 06:13 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024