An Interesting Aerodynamic Discovery!

M. Mitchell Marmel posted:

Just rebuilt the smoke generator on a 2065 Hudson, and it smoked up a storm on the test bench! 

On the track, though, the smoke tends to not rise; rather, it just sort of blows along the top of the engine.  

I thought that the Elesco feedwater heater molded into the front of the boiler was breaking up the airflow over the smokestack and causing the smoke to be disrupted.  ...

Mitch

 

Sounds just like the real thing with out the extension, but now the giraffes will no longer have smoke in their faces and that's a good thing. 

suzukovich posted:

Sounds just like the real thing with out the extension, but now the giraffes will no longer have smoke in their faces and that's a good thing. 

It was either this or give them goggles... 

Mitch

Time to make smoke defectors?

may be onto to something Mitch. I've got a few dead smoke units, including a 2055 with a 2065 front.

Allin posted:

Time to make smoke defectors?

That's a durned good question!  On the prototypes, they're intended to lift the smoke and improve driver visibility.  Do they have a similar effect at scale speeds?  Can someone with elephant-ear deflectors on their model locos provide some input here?

Steamer posted:

may be onto to something Mitch. I've got a few dead smoke units, including a 2055 with a 2065 front.

If they smoke up a storm while running but static, but don't smoke well in motion, try the tube trick and see what happens!   

Mitch

After a bit of experimenting and slightly sliced fingers (cut brass tubing is sharp!), here's a shorter stack that does the job nicely:

Even Fortescue approves!

Mitch

So you thought making a little brass tube was tricky. Let's see you try your hand a Gi-raffe goggles Guess that's why Fortescue was on the rear of the train.

Looks good Mitch! I love your creativity!

Doubtful anyone on this thread really cares, but here we go:

Prototypically Correct Alert!

The 2055 (no Elesco)/2065 small Hudsons were based upon - and a better sub-scale model than one would have thought  - the real ATSF 3460-class Hudsons. See photo below. The ATSF did not use smoke deflectors to lift the smoke at time - they used stack extensions. See photo, again.

You have stumbled into prototype practice - not usually associated with giraffes - and should not apply smoke deflectors. Your extension is, ah, "correct".

Now, the 2065 has both  a Worthington and an Elesco FWH - definitely Lionel PW fantasy time, but the real 3460's had the Worthington FWH pump on the pilot - again see photo - and the 2055/65 pilot area, engineer's side. There it is.

Note stack extension; it has a hinge as it was not used all the time. Remotely raised and lowered.

Note your 2055/2065 tool-and-die work; quite good (but they used a cheapened version of the scale NYC Hudson smokebox front). My childhood loco - still have it - was a 2055.

This had to be said. Giraffes? Well, I don't know, but the "giraffe goggles" made me smile.

D500 posted:

Doubtful anyone on this thread really cares, but here we go:

(raises hand)  You have my undivided attention!

You have stumbled into prototype practice - not usually associated with giraffes - and should not apply smoke deflectors. Your extension is, ah, "correct".

Quote of the day! 

This had to be said. Giraffes? Well, I don't know, but the "giraffe goggles" made me smile.

Excellent writeup!  Many thanks!

Mitch