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Exhaust colour

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  • Member since
    January, 2004
  • From: Brisbane Australia
Exhaust colour
Posted by ChrisJH666 on Wednesday, April 11, 2018 4:32 AM

I know this subject has probably been covered before, but please humour me! What is the best colour for a war weary exhaust on a P&W radial? Unfortunately, so far I haven't come up with a colour photo that helps. I'm a bit of a dinosaur and use Humbrol paints mainly

In the queue: 1/48 Vultee Vengeance (RAAF), Spitfire Vb (Malta), Spitfire VIII x2 (RAAF), P39 x2 (RAAF), P43 Lancer (RAAF), Martin Maryland (Malta), Typhoon NF1b, Hellcat x2 (FAA)

 

Chris

  • Member since
    February, 2013
Posted by tomwatkins45 on Wednesday, April 11, 2018 6:18 AM

You may get lots of diffent opinions on this, which will be good. In 1/48, I usually start with a coat of flat black, and follow with a very thin coat of a rust color. I'm a dinosaur too, so Floquil oxide red works well for this.

Hope this helps,

Tom

  • Member since
    September, 2006
  • From: Bethlehem PA
Posted by the Baron on Wednesday, April 11, 2018 7:39 AM

You mean the rust on the exhausts, right?  I'm not sure the specific engine makes too much of a difference to the technique.  I start with flat black, then dry-brush browns and red brown on top of it.  For staining trailing behind the exhausts in the air stream, I use pastel chalks-black, brown, and red brown, but also white, and usually darkest in the center of the staining, towards lighter colors around the outside.  If I can find photos of the airplane I'm building, I like to check them and adjust what I'm doing.

The bigger the government, the smaller the citizen.

 

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  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, April 11, 2018 8:53 AM

Too my mind, the new stacks with zero time on engine are not really black- I think of them as a dark grayish blue.  So I start with a very dark, flat blue, and do the rust wash over that.  With medium time engines I sometimes like to do some burning on the stacks, especially larger scale.  For the burning I either dry brush, or wash, with a tint of red and lighter blue and easier on the rust.

 

 

Don Stauffer in Minnesota

  • Member since
    March, 2015
Posted by JohnnyK on Wednesday, April 11, 2018 1:52 PM

This is a picture of the exhaust on an operational (Witchcraft)  B-24. https://www.cybermodeler.com/aircraft/b-24/b-24_walk2.shtml  . It seems to be the color of rust. Note that the material used for the nacelle in the area of the exhaust looks like stainless steel. It must get really hot in that area.

  • Member since
    January, 2004
  • From: Brisbane Australia
Posted by ChrisJH666 on Wednesday, April 11, 2018 3:19 PM

Thanks guys, that's really helpful. Best to get these things right BEFORE building the exhaust onto the back of the engine!

In the queue: 1/48 Vultee Vengeance (RAAF), Spitfire Vb (Malta), Spitfire VIII x2 (RAAF), P39 x2 (RAAF), P43 Lancer (RAAF), Martin Maryland (Malta), Typhoon NF1b, Hellcat x2 (FAA)

 

Chris

  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Wednesday, April 11, 2018 6:43 PM

I like to use Humbrol Track Color (178 I think) as a base color and then dry brush on Testors Steel or Jet Exhast for the top color.

 

F is for FIRE, That burns down the whole town!

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    February, 2014
  • From: Michigan
Posted by silentbob33 on Wednesday, April 11, 2018 7:14 PM
I'll start off painting it with rust, then dry brush dark brown over it. Once that's dry I use an old brush and rub on graphite from rubbing a pencil on sandpaper.

On my bench: 1/48 Academy F-5E Lightning

  • Member since
    April, 2010
Posted by Theuns on Wednesday, April 11, 2018 11:22 PM

Here is an exhaust ring of a T-6 where I work, you can clearly see the sifferent heat spots and the lead (white patch) where there is turbulance on the rear section od the exhaust stub.

 

 T-6 exhaust by Theunis van Vuuren, on Flickr

 

Theuns

  • Member since
    December, 2002
  • From: Northern California
Posted by jeaton01 on Thursday, April 12, 2018 12:04 AM

I would not trust the turbocharger pictures on the warbird bombers, I am pretty sure they are disabled as the airplanes are not flown at high altitude.  For low altitude flying the engine superchargers are sufficient.  Those GE turbochargers took a lot of maintenance.

John

To see build logs of my models, go here: http://goldeneramodel.com/mymodels/mymodels.htm

  

  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Thursday, April 12, 2018 1:17 AM

I realize that this is a factory new aircraft, but I’d go more towards heat discoloration and less towards rust. I’d wager that the exhausts were made from a stainless type steel

 

F is for FIRE, That burns down the whole town!

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    January, 2004
  • From: Brisbane Australia
Posted by ChrisJH666 on Thursday, April 12, 2018 4:23 AM

SadI so wish I could get Humbrol Track Colour! That stuff was excellent, but the current Humbrol Railway Colours range is a pathetic shadow of it's former self

In the queue: 1/48 Vultee Vengeance (RAAF), Spitfire Vb (Malta), Spitfire VIII x2 (RAAF), P39 x2 (RAAF), P43 Lancer (RAAF), Martin Maryland (Malta), Typhoon NF1b, Hellcat x2 (FAA)

 

Chris

  • Member since
    October, 2005
  • From: UK
Posted by antoni on Thursday, April 12, 2018 8:22 AM

For most aircraft the engine exhausts are made from nickel/chromium alloys that have no ferrous (iron) content so do not rust. They are resistant to oxidation and corrosion.
 
 
 
When new they have a brassy look similar to British £1 and £2 coins. Under conditions of high temperatures they form a thick oxide layer (passivation) that protects the metal from further oxidation. The colour gradually darkens eventually developing a patina that looks something like an old copper coin.
 
  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, April 12, 2018 8:38 AM

There are different materials for exhausts and manifolds.  Some engines had cast iron manifolds, which weathers/ages differently than fabricated manifolds made from various steel alloys.  But with weight an issue in aircraft, fabricated manifolds were indeed the most popular.

 

Don Stauffer in Minnesota

  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Thursday, April 12, 2018 5:18 PM

ChrisJH666

SadI so wish I could get Humbrol Track Colour! That stuff was excellent, but the current Humbrol Railway Colours range is a pathetic shadow of it's former self

 

Humbrol re issued the color recently. My old tin was used up years ago. But early this year during a trip to my shop that stocks Humbroll they had a box of new tins of the stuff. Now if they would only re issue Brown Bess, French Artillery Olive, and  Unbleached Wool...

 

F is for FIRE, That burns down the whole town!

U is for URANIUM... BOMBS!

N is for NO SURVIVORS...

       - Plankton

LSM

 

  • Member since
    June, 2014
Posted by BrandonK on Thursday, April 12, 2018 5:38 PM

Alclad makes an Exhaust Manifold color paint that mirrors the rusty look on those used manifolds very well. I use it or Testers Rust for well worn birds and steel with light blues and reds on less used engines. Trial and error is where its at. Work with different methods till you find one you like and works for you.

BK

On the bench: 1/48 Hobby Boss Ta-152C1/R14

1/25 MPC Deserter GMC 4x4.   2%

On Deck: Kenetics 1/48 E-2C Hawkeye 

1/650 AMT U.S.S. Enterprise

  • Member since
    January, 2004
  • From: Brisbane Australia
Posted by ChrisJH666 on Friday, April 13, 2018 4:51 PM

Thanks to all! Loads of useful info there. I've come up with a paint mix which approximates that in the photo of the T-6 engine, which is thinly applied over a black base. Should do the trick

In the queue: 1/48 Vultee Vengeance (RAAF), Spitfire Vb (Malta), Spitfire VIII x2 (RAAF), P39 x2 (RAAF), P43 Lancer (RAAF), Martin Maryland (Malta), Typhoon NF1b, Hellcat x2 (FAA)

 

Chris

  • Member since
    March, 2015
Posted by JohnnyK on Friday, April 13, 2018 5:27 PM

This is a photo of a B-17 exhaust. The pipe is between the engine's exhaust manifold and the supercharger.

I think that it is a great example of an exhaust pipe. I would use a base of rust and then drybrush a dark gray and a little black.

  • Member since
    January, 2004
  • From: Brisbane Australia
Posted by ChrisJH666 on Saturday, April 14, 2018 5:20 PM

Thanks JohnnyK. Nice photo

In the queue: 1/48 Vultee Vengeance (RAAF), Spitfire Vb (Malta), Spitfire VIII x2 (RAAF), P39 x2 (RAAF), P43 Lancer (RAAF), Martin Maryland (Malta), Typhoon NF1b, Hellcat x2 (FAA)

 

Chris

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