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 12-31-2019, 01:17 PM
jeffyjeep's Avatar
jeffyjeep jeffyjeep is offline
Old Submariner
 
Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,760
Default WAC Corporal built-up fins.

I discovered yesterday that I had to burn one last vacation day before the end of the year, so that left ONLY today to do it.

Time to try a project I've been thinking about: constructing built-up fins for a Semroc 1:10 scale WAC Corporal.

The kit come with (3) fin blanks of 3/16" balsa, but I don't quite have the skill to hand -scrape them into the scale profile. I've tried to do it with my nice, new Micro-Plane but all I succeeded in doing was swearing and bleeding.

Using the kit's heavy fiber stock fin pattern, I slit (3) blanks from my best sheet of 1/16" basswood. I then shape the corners and bevel all of the edges--except the root edge.

TBC
Attached Thumbnails
Click image for larger version

Name:  IMG_0992.JPG
Views: 20
Size:  53.2 KB  Click image for larger version

Name:  IMG_0993.JPG
Views: 14
Size:  41.4 KB  Click image for larger version

Name:  IMG_0994.JPG
Views: 17
Size:  42.4 KB  Click image for larger version

Name:  IMG_0995.JPG
Views: 16
Size:  52.4 KB  Click image for larger version

Name:  IMG_0996.JPG
Views: 16
Size:  44.6 KB  
__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078
Reply With Quote
  #2  
Old 12-31-2019, 01:29 PM
jeffyjeep's Avatar
jeffyjeep jeffyjeep is offline
Old Submariner
 
Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,760
Default

Now for the chord.

I slit a thin piece from the 1/16" basswood sheet, glue it to the fin blank, and then bevel and shorten the thin piece. I then cut a piece of .012" thick cardstock that's polished on one side. I apply Titebond Red to the bevels of the leading, outer, and trailing edges of the fin blank, lay the unpolished surface of the cardstock onto it, and hold all of the edges until the glue grabs.

TBC
Attached Thumbnails
Click image for larger version

Name:  IMG_0997.JPG
Views: 14
Size:  38.6 KB  Click image for larger version

Name:  IMG_0998.JPG
Views: 13
Size:  38.6 KB  Click image for larger version

Name:  IMG_0999.JPG
Views: 13
Size:  47.3 KB  Click image for larger version

Name:  IMG_1000.JPG
Views: 19
Size:  38.8 KB  
__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078
Reply With Quote
  #3  
Old 12-31-2019, 01:36 PM
jeffyjeep's Avatar
jeffyjeep jeffyjeep is offline
Old Submariner
 
Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,760
Default

After the glue sets on the one side, I slit the excess cardstock from the blank and then repeat the process for the other side. After the glue dries completely I sand the leading, outer, and trailing edges some more.

TBC
Attached Thumbnails
Click image for larger version

Name:  IMG_1004.JPG
Views: 15
Size:  57.9 KB  Click image for larger version

Name:  IMG_1003.JPG
Views: 14
Size:  42.0 KB  Click image for larger version

Name:  IMG_1002.JPG
Views: 38
Size:  39.7 KB  
__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078
Reply With Quote
  #4  
Old 12-31-2019, 01:43 PM
jeffyjeep's Avatar
jeffyjeep jeffyjeep is offline
Old Submariner
 
Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,760
Default

and................Voila!

All (3) fins are done and in less than an hour! It's time for The Price Is Right.

Thanks for watching.
Attached Thumbnails
Click image for larger version

Name:  IMG_1005.JPG
Views: 19
Size:  47.7 KB  Click image for larger version

Name:  IMG_1006.JPG
Views: 17
Size:  41.0 KB  Click image for larger version

Name:  IMG_1007.JPG
Views: 25
Size:  44.0 KB  Click image for larger version

Name:  IMG_1008.JPG
Views: 14
Size:  49.6 KB  Click image for larger version

Name:  IMG_1009.JPG
Views: 35
Size:  49.1 KB  
__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078
Reply With Quote
  #5  
Old 12-31-2019, 03:58 PM
LeeR's Avatar
LeeR LeeR is offline
Retired with Way Too Many Kits
 
Join Date: Jun 2007
Location: Colorado
Posts: 3,222
Default

Looks like a great way to profile a fin. Based on John Boren’s recommendation, I bought the same mini plane he uses. Unfortunately, he has probably 20-30 years experience using one. I have no experience.

Perhaps I’ve thought of my first New Year’s resolution: Learning to use the David Combi Hand Plane.
__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp
Reply With Quote
  #6  
Old 12-31-2019, 06:15 PM
BARGeezer BARGeezer is offline
Avid Builder
 
Join Date: Nov 2017
Posts: 610
Default

Hey Jeffy,
Do you score the inside and fold the cardstock along the taper line to highlight the profile before gluing? I've built cardstock fins that use that technique.
__________________
I like the unusual, the off beat, the avant-garde. No 3/4 FNC for me!
Reply With Quote
  #7  
Old 12-31-2019, 06:52 PM
jeffyjeep's Avatar
jeffyjeep jeffyjeep is offline
Old Submariner
 
Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,760
Default

Quote:
Originally Posted by BARGeezer
Hey Jeffy,
Do you score the inside and fold the cardstock along the taper line to highlight the profile before gluing? I've built cardstock fins that use that technique.


On some of them I do that--but on this one I didn't because in most of the WAC Corporal photos I could find the crease caused by the chord looked quite subtle.
__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078
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 09:57 AM.


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