[modeleng] Re: Blaastpipe calculations

Reducing the back pressure can be an advantage.
Some recent work has been done on that subject, in models and full size.

Details are at:

http://www.alanstepney.info/page14.html


Alan Stepney


http://www.alanstepney.info
Model Engineering & steam engine information pages
----- Original Message ----- 
From: "AndyA" <AndyA@xxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, May 23, 2005 11:56 PM
Subject: [modeleng] Blaastpipe calculations


Hi All
What calculations do you use to calculate the blast pipe diameter? The 
cylinders are 1.6875" diameter by 2.4375" stroke. This scales up very 
closely with the full size engine dimensions of 19" diameter  by 28" stroke. 
Someone suggested that I scaled the full size blast pipe which at 5.125" 
would give me a dimension of 0.454" diameter however this seems a little 
large. What does everyone think? The model design calls for 0.25" but that 
gives a fair bit of back pressure and a very strong blast. How about using 
the 0.25" designed diameter with a multiple jet nozzle? Would that offer any 
advantage?
Andy

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
line.


-- 
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.322 / Virus Database: 266.11.14 - Release Date: 20/05/2005


MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: