Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
Thread Tools
Old Dec 07, 2005, 04:31 PM
Brian Courtice is offline
Find More Posts by Brian Courtice
Free as a bird now.
Brian Courtice's Avatar

Kevlar gap seal for center hinged ailerons.


I decided to try a new idea out on my Mini SR. I really hate leaving an unsealed gap between the wing and ailerons when using CA hinges to center hinge the ailerons.

Here is the solution I tried:
After the torque rods and CA hinges were installed as usual, I sprayed a strip of kevlar with a fairly heavy coat of 3M77, and applied the kevlar to the hinge area while the 3M was still wet.

Next I wetted out the kevlar with 5 min epoxy. I should have used a thinner, slower setting resin. As you can see the thick epoxy resulted in a pretty rough surface. I could have a much neater job that would have required less filler.

After the epoxy cured I applied some bondo to even out the surface. At this point I'm close, but I'll still need some spot filler and lots of primer to even everything out.

It works! The result is an airtight seal that can be painted, and a super strong hinge. There is no way this aileron will ever get pulled off in a hard landing.
Sign up now
to remove ads between posts
Old Dec 07, 2005, 04:58 PM
InTheLift is offline
Find More Posts by InTheLift
It could happen...
InTheLift's Avatar
Brian, looks like a great idea. I'll have to try that on a future build.
Old Dec 07, 2005, 05:32 PM
lrsudog is offline
Find More Posts by lrsudog
Go get them Meg!
lrsudog's Avatar
Did the kevlar get "Fuzzy" when you sanded through the epoxy?
Old Dec 07, 2005, 05:43 PM
Reed is offline
Find More Posts by Reed
Vitruvian JART
Reed's Avatar
Nice, Brian. That takes the old tape idea to another level.
Old Dec 07, 2005, 05:46 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
Ive actually used solartex and resin wiped it worked extrememly well also
but Kevlar would be definetly stronger .
SteveW
Old Dec 07, 2005, 05:53 PM
Brian Courtice is offline
Find More Posts by Brian Courtice
Free as a bird now.
Brian Courtice's Avatar
You do have to be carefull not to sand into the kevlar and fuzz it up. At the first sign of fuzz, stop sanding!

I've used clear tape over the paint like Reed does, but you can still see the gap and the hinges. I wanted something similar to the look you get when you cover a wing in Solartex or Ultracoat, with the fabric ironed down into the hinge gap.

Hmm. Solartex would be easier to cut and apply, and it is also paintable. That would have been easier, and it would have done the same job. The kevlar is stronger but you don't really need the strength if your hinge job was good to start with.
Old Dec 07, 2005, 07:12 PM
Reed is offline
Find More Posts by Reed
Vitruvian JART
Reed's Avatar
I like Steve's solartex idea, too. I think I'll try that on my next build.
Old Dec 07, 2005, 07:55 PM
target is offline
Find More Posts by target
Detail Freak
target's Avatar
Quote:
Originally Posted by Reed
I like Steve's solartex idea, too. I think I'll try that on my next build.

I'v done that on my F-80. Works pretty good, but painting make the hinge action fairly stiff, be careful.

T
Old Dec 07, 2005, 08:05 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
Clarification: I resin wipe the upper and lower surface not actually in the hinge line as for painting I use pin striping tape in the hinge line so it doesnt get clogged as Target said it would stiffen the throws up .But then again after the paint had dried,
and you manually move the sufaces up and down a few times the paint would yeild surely . Mind you thats only a guess as I said I dont paint the hine line
SteveW
Old Dec 08, 2005, 12:59 AM
bluffman is offline
Find More Posts by bluffman
Registered User
bluffman's Avatar
that look likes one tough wing brian great job Ian
Old Dec 08, 2005, 01:57 AM
infopimp is offline
Find More Posts by infopimp
PNF
infopimp's Avatar
Seriously: those wings are SICK. That thing is going to haul a*5.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Gap seal on flaps and ailerons Rob AR High Performance 16 Dec 30, 2006 07:29 AM
Aero Seal for Hinged Surfaces F.Littleton Parkflyers 3 Nov 06, 2003 02:22 PM
Question Hinge and gap seal sarebro Thermal 0 Nov 19, 2002 05:27 AM
Rule of thumb for center of gravity spark363 Modeling Science 4 Jul 05, 2002 04:31 PM
Are HS-55's sufficient for X-250 ailerons,etc ? Al P Sport Planes 8 Jun 12, 2002 09:59 AM