The A4 and the Brit/Clan/73xxx whistles were the same except the Br made jobs were a slightly different grade of bronze, but they sounded different on a Brit due to overblowing/squeeling having been made for a working pressure of 225psi rather than the 280? Of the Brits.
4" Foster agricultural traction engine running and a 4" scale Foster 7NHP double crank compound showmans road loco under construction with a 5" Gauge Alco WDLR 2-6-2(Mountaineer) under construction as a gap filler.
Post by richardwilliams on Nov 28, 2015 16:44:54 GMT
Interesting discussion. On my 5 inch Brit I fitted a 7 1/4 inch gauge chime whistle (between the frames) Cost a bit (circa £50 now I believe) so taking a risk it would work. On good pressure (just before blowing off) it works well. I think I obtained it from Blackgates.
Key issue is to ensure the pipe from the whistle valve at the front is large enough, and lagged from where it disappears below the running board.
I'm afraid I forget look past the General Chat most time so I'm probably a bit late for this but I received the drawings for a nice full throated Britannia three chime whistle from a fellow forum member, was it you Frank?
Anyway it sounds just right and under 80psi can be heard 3 houses away, I haven't tried it in steam yet. I've mounted it between the frames under the smoke box. To service if needs be all I need to do is drop the front bogie to give me free access.
My only concern at this stage is that condensate may cause problems in the long steam line from the cab, if it does I'll fit a snifter type valve to let the condensate drain out but seal under pressure.