News:



Advertise Here

  • August 17, 2019, 11:41:24 PM

Login with username, password and session length

Author Topic: Polishing custom canopies  (Read 466 times)

Offline Mike Alimov

  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 112
Polishing custom canopies
« on: July 24, 2019, 07:36:07 PM »
Every clear canopy after heat forming has minor surface defects and distortions. What steps are needed to turn it into a perfectly optically clear canopy? Iím assuming sanding and polishing, but what would be the starting grit and the subsequent steps and materials? Should this be done only on the inside, only on the outside, or both? Are there defects that make some canopies beyond help, or can just about anything be polished out with enough elbow grease and patience?

Offline Avaiojet

  • 2018 Supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 6722
Re: Polishing custom canopies
« Reply #1 on: July 25, 2019, 06:28:55 AM »
Every clear canopy after heat forming has minor surface defects and distortions. What steps are needed to turn it into a perfectly optically clear canopy? Iím assuming sanding and polishing, but what would be the starting grit and the subsequent steps and materials? Should this be done only on the inside, only on the outside, or both? Are there defects that make some canopies beyond help, or can just about anything be polished out with enough elbow grease and patience?

I would send the plug to Park Flyers. He pulls great canopies.

But that's me.

CB
Trump Derangement Syndrome. TDS

Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Wolfgang Nieuwkamp

  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 90
Re: Polishing custom canopies
« Reply #2 on: July 25, 2019, 07:46:36 AM »
Nevr-Dull and elbow grease!

Regards,

Wolfgang

Offline FLOYD CARTER

  • 2019 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3686
    • owner
Re: Polishing custom canopies
« Reply #3 on: July 25, 2019, 10:07:13 AM »
I once tackled the plastic (plexiglass?) front windshield on my Cessna 172, which was pitted.  I started with block sanding with 600 wet or dry, ending with 2000, 4000,  and polishing with Maguire's "Mirror Glaze".  Lots of work, but the results were perfect.  The same can be done with any plastic canopy.  I think the secret is using a block to sand, with plenty of patience.  Can defects be detected from 6 feet away?
"Growing old is easy.
 Staying old is hard"
AMA #796  SAM #188  LSF #020

Offline Dan McEntee

  • 2015
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3421
Re: Polishing custom canopies
« Reply #4 on: July 25, 2019, 08:29:46 PM »
   Hi Mike;
   There are all sorts  of polishing kits for head light lenses on the market these days for when they get crazed over from road grit and dust and dirt. Those should work, or any other kind of plastic polish, like for what boat owners use for their wind shields, which are usually plastic of some sort, or aviation plexiglass. I think you would be impressed with how well toothpaste might work with a clean, soft cotton cloth and some elbow grease. A common practice among plastic model builders is to just buff the canopy of the airplane kit back and forth over the leg of your jeans pant leg!  Pick out an expendable canopy to test the different methods on. I think you will find that they polish out fairly easily.
   I'm still working on the pics I need to send you!!!
    Type at you later,
   Dan McEntee
AMA 28784
EAA  1038824
AMA 480405 (American Motorcyclist Association)

Offline Don Jenkins

  • 2019 supporter
  • Trade Count: (0)
  • Commander
  • *
  • Posts: 295
Re: Polishing custom canopies
« Reply #5 on: July 26, 2019, 05:01:34 AM »
I wet sand with 2000 grit then shoot with clear.  My last few planes were shot with 2 part auto clear, but dope works too.  Good luck.

Don

Offline Steve Fitton

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 2168
Re: Polishing custom canopies
« Reply #6 on: August 05, 2019, 05:50:38 PM »
Sometimes the distortion is in the plastic itself. I don't think that type of distortion can be fixed.
Steve


Advertise Here
Tags:
 


Advertise Here