Because you have about the same heat going into a smaller amount of water so the water boils even faster, which makes more pressure so the engine goes faster. It is a bit of a steam 'Swan Song'. After the water falls below the flues they are forced to radiate their heat to the air (or conduct their heat into surrounding metal structures) so the water cools and pressure drops, slowing the engine. But by this point the engine is 'running dry' and may have suffered some damage.
---- Original Message ---- From: "Mike Chaney" <[EMAIL PROTECTED]> To: "Small-scale live steam discussions" <[email protected]> Cc: Subject: Re: [SSLiveSteam] Aster JNR Date: Thu, January 25, 2007, 17:57:00 Gary wrote:- > .... When the engine speeds up after running for > awhile, the boiler has too little water allowing the fire to heat the > water more rapidly than when adequate water is in the boiler. I won't argue with the first part of that sentence as I have no experience of it, but could you please explain the physics of the second part? Mike _______________________________________________ SSLiveSteam mailing list Send messages: [email protected] Cancel subscription: http://postfix.45mm.com/mailman/listinfo/sslivesteam Rules: http://www.45mm.com/sslivesteam_guide.html _______________________________________________ SSLiveSteam mailing list Send messages: [email protected] Cancel subscription: http://postfix.45mm.com/mailman/listinfo/sslivesteam Rules: http://www.45mm.com/sslivesteam_guide.html
