Notices
Classic RC Pattern Flying Discuss here all pre 1996 RC Pattern Flying in this forum.

A Few Building Ideas To Chew On

Old 05-23-2016, 08:16 AM
  #76  
MTK
Senior Member
Thread Starter
 
Join Date: May 2004
Location: Whippany, NJ
Posts: 5,386
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by doxilia View Post
Matt,

please do post some pictures of your efforts. I'd be interested in seeing your adjuster design as well as hearing about your procedure for making tube sockets from 1/32" balsa and glassing.

David
David, I will.

a quick description for sockets, wing tube or stab doesn't matter. The technique is the same.

I first glass a sheet of medium 1/32" balsa with 1 ounce glass and epoxy, and let it cure. One 3" sheet is enough material for full set of sockets.

I cut rectangles wide enough for a small overlap and as long as necessary. I wet the wood well to keep it from splitting.

I wrap it around the respective tube, glass side against the tube the socket is for. Wet balsa naturally curves in the right direction making this job easy. The tube has a strip of plastic tape on it lengthwise which serves as a spacer. It only covers about 1/2" of the circumference. I then wrap a length of rubber carefully around the assembly to desired tightness, covering roughly every 1/16". Must be snug but not tight. I let this dry

once dry, I remove the rubber and carefully cut the overlap off. This isnt necessary as you can just glue the overlap down and you are good to go, but I cut it off. I then align the edges over the tape on the tube, apply some elmers and rewrap with the rubber band making sure it is snug. After the elmers dries, I remove the rubber and loosen the socket from the carbon tube. The tape is a good release. The tape is removed at this point I check the fit. I like a nice snug fit. Too tight and it would be hard to separate after a flying session; too loose and it just gets sloppy

i then reinforce the balsa with carbon or Kevlar toe, wrapping the socket with about 1/4" spacing, in both directions. Higher stress areas such as the wing or stab entry and the far end of the socket, take a few extra wraps of toe. I normally lock the toe onto the wood with nitrate dope but ca, epoxy, elmers, gorilla, what have you, all work but are heavier. There's nothing magic about carbon or Kevlar, I just have the materials on hand. Glass is fine.

Installation in the flying surface has the seam facing to the rear, the area of least stress. The installation couples the socket to the skins through sheer webs in built up wings or stabs or what I call a sub spar in foam. It must touch the socket and the skin, forming an "I" beam structure. I usually use 1/16" or 3/32" medium balsa for sub spars. These extend beyond the end of the socket by a couple inches removing the stress riser. I don't like the more popular practice of supporting the socket with sub ribs at the ends only.

Hope that's clear
Old 06-12-2016, 10:25 PM
  #77  
MTK
Senior Member
Thread Starter
 
Join Date: May 2004
Location: Whippany, NJ
Posts: 5,386
Likes: 0
Received 0 Likes on 0 Posts
Default

Foam wing construction using vacuum


Vacuum is set at 5" Hg neg. For this wing size it's the equivalent of about 1200 lbs. Breather is a must to produce the desired result. Mine is very hi tech....paper towels are taped on the sheeting and a path to the vac source is created with a piece of felt.

This method is very easy and assures continuous contact on every square mm. Even a marginal amount glue sticks well. I roll the glue on with a small foam spong roller for smooth surfaces. Much glue soaks into the sponge so residual is rolled on the foam also making it tacky.

i use US Composites, EZ Lam, Pro Set, whatever epoxy I have at the time for wings because of the 60-90 min working window. Gorilla for stabs because these are faster and there is enough time before the gorilla sets
Attached Thumbnails Click image for larger version

Name:	image.jpeg
Views:	180
Size:	2.24 MB
ID:	2167641   Click image for larger version

Name:	image.jpeg
Views:	169
Size:	1.98 MB
ID:	2167642  

Last edited by MTK; 06-13-2016 at 06:05 AM.

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.