04-13-2014, 04:40 AM
Sumpter,
thanks for your opinion about air pumps. This theme is a very external one for me because I never did hear an American air pump in original.
jwb,
the sound of articulateds and mallet steam engines is not very complicated - but very often wrong realized at models.
First, take an articulated, more exactly a simple artikulated with four high pressure cylinders.
Each cylinder generated its own sound, two chuffs per wheel rotation. And four cylinders generate eight chuffs together.
However in many cases you can hear four double chuffs or also four single chuffs, because the wheel positions of front and rear engines run more or lesser synchronously. These eight steam chuffs merge a lot more to an indefinable noise. The single chuffs are no longer clearly to separate at articulateds, in contrast to the chuffs of two-cylinder engines.
Mallets thus compound engines are working a bit different. Only the front cylinders have exhaust pipes to exhaust nozzles in the smoke box and so you can hear only the sound of two cylinders, thus four chuffs. Ever! This is true even if a mallet is starting and high-pressure steam is given additionally to low-pressure cylinders. All steam of a mallet must go through low-pressure cylinders and after into exhaust nozzle in smokebox and smoke stack. Therefore four chuffs only at mallets!
.
.
. Sorry, I have deleted here a greater section of my text. Mayby I must write a correction about mallets of last level of develoment.
. I have a few other aspects found that I have not included in my description. A next post will follow with new desription.
. Thanks for your interest.
.
thanks for your opinion about air pumps. This theme is a very external one for me because I never did hear an American air pump in original.
jwb,
the sound of articulateds and mallet steam engines is not very complicated - but very often wrong realized at models.
First, take an articulated, more exactly a simple artikulated with four high pressure cylinders.
Each cylinder generated its own sound, two chuffs per wheel rotation. And four cylinders generate eight chuffs together.
However in many cases you can hear four double chuffs or also four single chuffs, because the wheel positions of front and rear engines run more or lesser synchronously. These eight steam chuffs merge a lot more to an indefinable noise. The single chuffs are no longer clearly to separate at articulateds, in contrast to the chuffs of two-cylinder engines.
Mallets thus compound engines are working a bit different. Only the front cylinders have exhaust pipes to exhaust nozzles in the smoke box and so you can hear only the sound of two cylinders, thus four chuffs. Ever! This is true even if a mallet is starting and high-pressure steam is given additionally to low-pressure cylinders. All steam of a mallet must go through low-pressure cylinders and after into exhaust nozzle in smokebox and smoke stack. Therefore four chuffs only at mallets!
.
.
. Sorry, I have deleted here a greater section of my text. Mayby I must write a correction about mallets of last level of develoment.
. I have a few other aspects found that I have not included in my description. A next post will follow with new desription.
. Thanks for your interest.
.
Cheers, Bernd
Please visit also my website www.us-modelsof1900.de.
You can read some more about my model projects and interests in my chronicle of facebook.
Please visit also my website www.us-modelsof1900.de.
You can read some more about my model projects and interests in my chronicle of facebook.