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Steel rim on engine cowlings

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  • Member since
    May 2006
  • From: Spanaway, WA
Steel rim on engine cowlings
Posted by aagranata on Saturday, January 7, 2012 4:10 PM

Does anyone have any good masking techniques for painting those steel rims that you see on the front of airliner engine cowlings?  Tamiya masking tape doesn't work for me since it doesn't seem to fit around that type of contour.  I plan to just paint them using a regular paintbrush.

One good hour working on a model erases 8 bad hours at work!!
  • Member since
    March 2010
  • From: MN
Posted by Nathan T on Saturday, January 7, 2012 4:19 PM

try holding an appropriate sized circle template around it. I just did that on my arado engine nacelles with an airbrush and it worked pretty well. You just have to hold the circle template square, or tape it in place somehow

 

 

  • Member since
    March 2008
  • From: Charleston, SC
Posted by kg4kpg on Saturday, January 7, 2012 7:12 PM

Paint the rim first then mask from the other side of the tape to paint the rest of the cowl. 

  • Member since
    January 2009
  • From: San Antonio
Posted by paintsniffer on Monday, January 9, 2012 8:47 AM

I have freehanded them with reasonably good results.. But that is probably a lot of pure, dumb luck.

Excuse me.. Is that an Uzi?

  • Member since
    February 2003
  • From: Rothesay, NB Canada
Posted by VanceCrozier on Monday, January 9, 2012 8:51 AM

If you're lucky you may find an elastic band that stays tight in the right spot. Back that up with some tape to keep it in place & use that as your masking line if you are careful.

On the bench: Airfix 1/72 Wildcat; Airfix 1/72 Vampire T11; Airfix 1/72 Fouga Magister

  • Member since
    April 2005
  • From: Piscataway, NJ!
Posted by wing_nut on Wednesday, January 11, 2012 3:08 PM

This is one of those application where I think one of the liquid masks like Micro Mask, the blue stuff, is perfect.  The 'IF' is... if there is a panel line at the edge of the metal rim.   Paint the metal part with Alclad, paint on the mask and let it dry.  Cut along the panel line and peel away the unwanted mask.

Marc  

  • Member since
    June 2010
  • From: Austin, TX
Posted by DoogsATX on Wednesday, January 11, 2012 3:12 PM

There's this blue artist tape you can buy at Hobby Lobby that can curve. Similar in texture to electrical tape but lower tack. I've found it better than 3M fineline tape for cowls and fuselage bands.

On the Bench: 1/32 Trumpeter P-47 | 1/32 Hasegawa Bf 109G | 1/144 Eduard MiG-21MF x2

On Deck:  1/350 HMS Dreadnought

Blog/Completed Builds: doogsmodels.com

 

  • Member since
    June 2010
  • From: Austin, TX
Posted by DoogsATX on Wednesday, January 11, 2012 3:27 PM

Also, I HIGHLY second the tip of painting the cowl first, then masking it and painting the rest of the aircraft. The cowl usually represents an uneven cross-section, with the fuselage sloping up/down/in. In practical terms, this means that if you wrap tape around the cowl, the circumferences at the forward and aft points will be different. The aft line will be nice and smooth, but the forward line will want to bunch and lift. 

If you paint the cowl, then mask, you can take advantage of that aft line effect.

On the Bench: 1/32 Trumpeter P-47 | 1/32 Hasegawa Bf 109G | 1/144 Eduard MiG-21MF x2

On Deck:  1/350 HMS Dreadnought

Blog/Completed Builds: doogsmodels.com

 

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, January 12, 2012 9:12 AM

I am still not sure what we are talking about here.  Most of the cowlings I am familiar with are all aluminum on the exterior.  Not sure exactly where this steel rim is.  Do you have any photos or drawings that show where this is?

Don Stauffer in Minnesota

  • Member since
    April 2005
  • From: Piscataway, NJ!
Posted by wing_nut on Thursday, January 12, 2012 9:25 AM

I thik the use of thre word steel was a mistake.  I beileve he is refering to the front edge of the egine cowl such as this as it is onmost that have the cowl painted.

http://en.wikipedia.org/wiki/File:United_Parcel_Service_757-200PF.jpg

Marc  

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Friday, January 13, 2012 10:02 AM

wing_nut

I thik the use of thre word steel was a mistake.  I beileve he is refering to the front edge of the egine cowl such as this as it is onmost that have the cowl painted.

http://en.wikipedia.org/wiki/File:United_Parcel_Service_757-200PF.jpg

Ah! okay, I was thinking of older aircraft. I have sometimes wondered on these current aircraft why this ring is left unpainted- why not the whole cowl/nacelle white?

Don Stauffer in Minnesota

  • Member since
    January 2009
  • From: San Antonio
Posted by paintsniffer on Friday, January 13, 2012 3:28 PM

Don Stauffer

 

 

 

Ah! okay, I was thinking of older aircraft. I have sometimes wondered on these current aircraft why this ring is left unpainted- why not the whole cowl/nacelle white?

 

I believe they pump bleed air through that section so they don't get ice build up on the inlet.

Excuse me.. Is that an Uzi?

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Saturday, January 14, 2012 9:13 AM

paintsniffer

 

 Don Stauffer:

 

 

 

 

Ah! okay, I was thinking of older aircraft. I have sometimes wondered on these current aircraft why this ring is left unpainted- why not the whole cowl/nacelle white?

 

 

 

I believe they pump bleed air through that section so they don't get ice build up on the inlet.

That's right!  They'd get hot!

 

Don Stauffer in Minnesota

  • Member since
    January 2003
  • From: Washington State
Posted by leemitcheltree on Wednesday, January 18, 2012 12:34 PM

It's easy to get perfect results using Tamiya tape.

I lay a piece of the tape dowm on a sheet of plexiglass, cut a thin strip - about 2-3mm - and use that to mask the demarcation like from cowl color to alloy intake ring. 

The extremely thin strip easily conforms to all sorts of complex compound curves so you can get a perfect line....then, just fill in the blanks with full width tape and paint the cowl ring.  Easy!

Cheers, LeeTree
Remember, Safety Fast!!!

  • Member since
    May 2006
  • From: Spanaway, WA
Posted by aagranata on Wednesday, January 18, 2012 3:39 PM

Thanks for all the tips, guys.  I think I'll go with painting the cowl first and then masking.  I already use this technique when painting radomes, but there's more room to work with there.  Cowlings may be a bit tougher.  I'll post later how it turns out....

 

One good hour working on a model erases 8 bad hours at work!!
  • Member since
    January 2011
Posted by air4mdc on Friday, January 20, 2012 10:03 PM

The engine nacelle(inlet) is not painted, is aluminum, and is heated using bleed air. On our fleet the nacelles are not polished, the RR RB211,PW4000 series and the PW2040's and the GE CF6. You will see the leading slats polished. Don't forget the accoustical panels in the inlet will be a different shade of color than the inlets.Sometimes they delaminate and we cut away the panel and seal the edges with sealant.

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