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thierry laurent

Rolls Royce Merlin exhaust angle on early Spitfires

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Hi, 

 

I have a problem to position correctly the early tubular exhausts on a Spitfire MkI. Pictures and plans of the engine front view clearly indicate a noticeable angle. Have a look here for one example:

http://jn.passieux.free.fr/html/Merlin.php

 

However, scale plans of the plane including the following one show a nearly horizontal stance in comparison with the datum line:

 

1front.gif

Does anyone have more precise info? To me it looks they were clearly angled! 

 

Weird! 

 

Thierry 

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Thanks but from such angles it is not possible to assess for sure. I had the same problems with the pictures I looked at. Only a front view in front of the spinner could give a final reply. 

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55 minutes ago, LSP_K2 said:

Given that the cylinder head banks were canted outward, and assuming the exhaust pipes were perpendicular to those, yes, a downward angle makes perfect sense.

That is what I concluded as well. However, I was puzzled when I looked at the planes plans from different sources as well as many models (but the latters are possibly based on the formers). 

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These close-ups might help a bit.  Note that the center-line of the exhaust appears to be angled down slightly.

 

dfuRL3.jpg

 

yGqz8J.jpg

 

 

From this rear angle, however, they look pretty flat.

 

9AWhUV.png

 

 

 

Cheers,

Chuck

Edited by chuck540z3

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This is the typical problem of the bottom views! The only way to be fully sure would be a picture taken from the propeller front level. I'm also wondering if the exhausts are not slightly twisted if you compare the relative position of all exhaust holes. 

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I'd say going just slightly downwards. Definitely not straight out of the holes in the engine block like in that Merlin drawing above.

Pictures from David Whitworth's Flickr:

 

14319509921_1042e1722d_b.jpg

1011:G-AIST / P7308 by David Whitworth, on Flickr

 

16448357880_71839c122c_b.jpg

0180:G-AIST / P7308 by David Whitworth, on Flickr

 

16013606914_66a93e9e79_b.jpg

0181:G-AIST / P7308 by David Whitworth, on Flickr

 

I hope that helps a little.

 

Juraj

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16013606914_66a93e9e79_b.jpg

 

They're a lot bigger than you might think!

 

I've got one of those air compressors somewhere

 

Richard

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