Peter,
That sounds cracking; I am tempted when I get is to put her through her paces by placing a fully loaded 8 carriage Evans Set as it was in peak hour on Brisbane Northside.
I have just revised my engine specifications for the DD17 as I have recieved new information from John Knowles regarding the engines. The engine congif was originally based on detailed hand notes given to me by Brian O'Sullivan aka Sully when he was driving DD17 1051 on the QR 145th Train from Ipswich To Grandchester in 2010. After hours of reading John Knowles awesome book "Queensland Railways - Steam Locomotives; Design & Operation 1865 to 1969" I think I have a winning and realistic formular.
If you want I can send it onto you to have a test.
Regards
Michael Gitsham
That sounds cracking; I am tempted when I get is to put her through her paces by placing a fully loaded 8 carriage Evans Set as it was in peak hour on Brisbane Northside.
I have just revised my engine specifications for the DD17 as I have recieved new information from John Knowles regarding the engines. The engine congif was originally based on detailed hand notes given to me by Brian O'Sullivan aka Sully when he was driving DD17 1051 on the QR 145th Train from Ipswich To Grandchester in 2010. After hours of reading John Knowles awesome book "Queensland Railways - Steam Locomotives; Design & Operation 1865 to 1969" I think I have a winning and realistic formular.
If you want I can send it onto you to have a test.
Regards
Michael Gitsham
Today I took Boobless_ed's DD17 for a test run and it was just as powerful as the BB18.25 on a test track I have with a standard load that I use for QR steamers, which is to be expected as it is Greg Cash's BB18.25 engine file. Up to 55MPH on a relatively long flat section over a few miles therefore impressive. Test track also included a fairly steep section and OK there too, of course!
In the real world the DD17 and the B17, B18.25 and BB18.25 were rated for the same loads although the DD17 needs tanks and bunker at least one third full for sufficient adhesion. On the Ipswich line with its 1/75 gradients the DD17 was rated with a full goods load [not passenger load] of 445 tons. Passenger loads were a bit less for stop start station trips and express trains at passenger speeds. The DD17 boiler was smaller than the BB18.25 to allow water and coal to be carried on the one frame and thus their power potential less.
Real world loads for DD17, B17, B18.25 and BB18.25 were;
1 in 40 was 225 tons , 1 in 80 was 475 tons , 1 in 120 was 710 tons and max of 850 tons but needed special latest version high strength drawgear fitted wagons as usual screw couplings limited maximum train loads to 650 tons for many years especially pre 1958. Loads etc mostly copied from this book P.200 and 263 http://railshop.com.au/prod27.htm