J3 Cub Forum > Cub Discussions > Restoration > Wood Spar installing nails?

Help Support J3 Cub by donating using the link above or becoming a Supporting Member.
Reply
 
Thread Tools Display Modes
Old 06-06-2017, 01:20 PM   #1
supercub
Senior Member
 
Join Date: Nov 2007
Posts: 163
Liked 6 Times on 4 Posts

Default Wood Spar installing nails?

I recently heard something that I had never heard before, and that is, prior to using nails (I'm talking about the small little brads) used in assembling a wood J-3 wing that you should drill a hole first, obviously smaller then the nail. Supposedly this will keep the spar from splitting. Seems to me, if those little nails split the spar, I want to know it before I trust my life hanging by it. What's your thoughts on this? Thanks


supercub is offline  
 
Reply With Quote
Old 06-06-2017, 02:32 PM   #2
Fifinella
Premium Member
J3_ADMIN.png
 
Fifinella's Avatar
 
Join Date: Jan 2010
Location: Northwood, NH
Posts: 3,129
Liked 812 Times on 561 Posts
Likes Given: 2988

Default

I disagree. The aircraft nails have a pyramid shape to the point which when driven separates the wood fibers and does not crush or tear them. They are also cement coated. Never seen any aircraft nail split aircraft grade wood. Drilling a hole first would defeat the holding force of the nail, besides Piper never felt they needed to do that, so why would we ....?

Just my nickles worth,
KAP


__________________
Thanks for reading.
KAP

"The L-4H Project"
Presently building an L-4, Experimental. From copies of Piper L-4 Drawings.
Built a Pietenpol AirCamper, Model-A powered, NX3116.
Fifinella is offline  
7
People Like This 
Reply With Quote
Old 06-07-2017, 01:01 AM   #3
33450
Supporting Member
J3_SUPPORTER.png
 
Join Date: Aug 2013
Location: Medina, Ohio
Posts: 132
Liked 43 Times on 33 Posts
Likes Given: 8

Default

Quote:
Originally Posted by supercub View Post
I recently heard something that I had never heard before, and that is, prior to using nails (I'm talking about the small little brads) used in assembling a wood J-3 wing that you should drill a hole first, obviously smaller then the nail. Supposedly this will keep the spar from splitting. Seems to me, if those little nails split the spar, I want to know it before I trust my life hanging by it. What's your thoughts on this? Thanks
Grab 'em with a pair of needle nose pliers and pound home with a tack hammer.
33450 is online now  
 
Reply With Quote
Old 06-10-2017, 12:07 AM   #4
iowa
Lifetime Supporting Member
J3_LIFETIMESUPPORTER.png
 
iowa's Avatar
 
Join Date: Nov 2006
Location: Guthrie Center, IA
Posts: 2,358
Liked 189 Times on 139 Posts

Default

paul babcock (weymouth) rebuilt my wings and used original nails to install ribs
he sent me a few of these for my collection of parts
these will not damage the spars if installed as described above by 33450
iowa
iowa is offline  
 
Reply With Quote
Old 09-23-2017, 01:47 AM   #5
BrocksCub
Junior Member
 
Join Date: Feb 2017
Posts: 1
Default

Hello, watch "construction of a light aircraft" 1943 on youtube its vintage black and white footage of the piper factory, shows much of the cubs construction and pipers work force. In it you will see a segment which shows exactly what someone posted about using pliers and a tack hammer. We just completed one wing on our 1938 j3 cub sport, and we used a rivet gun with low pressure setting and stabilized the brad with a pair of needle nose pliers, we tested some brads in a piece of scrap spar driven through an old rib attatch clip, then tried to peel it apart, Trust me that cement on the brads really works, if you drive the nail half way, and stop the cement will harden and will resist being driven further, so line it up and drive it home, its the friction that activates the cement. This method was perscribed to me, and after beginning to attatch the ribs we found his method to be easy to use.
BrocksCub is offline  
 
Reply With Quote
Old 09-23-2017, 01:47 PM   #6
jimmy
Lifetime Supporting Member
J3_LIFETIMESUPPORTER.png
 
Join Date: Jul 2009
Posts: 2,225
Liked 274 Times on 212 Posts
Likes Given: 407

Default

I hope my nails don't back out, I hand drove em home.
__________________
I rebuilt my cub in 94 from a duster basket case. Been flying and maintaining since and fly off an 1800' strip/pasture.
jimmy is offline  
 
Reply With Quote
Old 09-23-2017, 11:16 PM   #7
33450
Supporting Member
J3_SUPPORTER.png
 
Join Date: Aug 2013
Location: Medina, Ohio
Posts: 132
Liked 43 Times on 33 Posts
Likes Given: 8

Default

These nails have been in place in my spars for 77 years. The cement coated nails hold.


Attached Thumbnails
Click image for larger version

Name:	Left Wing (41).jpg
Views:	74
Size:	66.7 KB
ID:	48180  

Last edited by 33450; 09-23-2017 at 11:21 PM. Reason: wording
33450 is online now  
2
People Like This 
Reply With Quote
Reply


Go Back   J3 Cub Forum > Cub Discussions > Restoration

Thread Tools
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Re: Loose nails in rib to spar connection ccraig Restoration 38 08-19-2016 11:10 PM
L-4 Wood Spar me109me109 L4 and NE1 4 11-19-2013 11:39 PM
Wood ribs & Wood spar attachment Q ... Fifinella Restoration 25 10-17-2013 11:32 AM
Wood spar amd metal spar wings York_Cub Cub Trivia and Humor 29 01-20-2010 02:10 AM
spar wood J5A Restoration 1 09-16-2008 06:34 PM



Newest Threads