Has there ever been any construction articles on the early diesel - electric loco's ie class 25 or 31 etc in the model engineering press? I have been toying with the idea but i,m only familiar with steam.
There was a set of three articles in EIM describing the building of a Brush Class 31 Locomotive in 7 1/4" gauge. See EIM July, August and September 2005.
I have a battery powered 5"G Hymek and found there is a difference working with diesel outline. With steam you are mostly following the prototype but with the inside of the diesel you have to design it yourself. Being a retired electronics engineer it was fun, hands on like being a junior engineer again, instead of writing specs for other people to have all the fun.
Peter Thankyou for the info. A Brush class 31 in 7 1/4" gauge was exactly what i was thinking of! I've had a Triang one for 00 gauge since i was a youngster in the mid seventies,must have belonged to my eldest brother.My local club has a ground level 7 1/4" gauge track only,so putting two and two together! bingo!I must now go and do a lot more research into these loco,s as i really am out of my normal field.
Just spotted this, I thought I'd bring up an idea that's been floating in my head. Could a model that really is diesel electric be built? Proper engine, genny and everything where they are on the real thing. I've done a few rough calculations, I figured a 1/12 engine in a 1/16 (3 1/2" gauge, to match my tich and Britannia when eventually built) should fit, so a class 37 would have something like 8.8cc/cylinder, 105.6cc in total. Take a lot of making I know, but would be interesting.
Greenbat, don't know where you are, but if you can get Model Engineer no., 4439, 21sept - 4 Oct 2012, the cover feature is "Build a real Diesel Elecric Class 47 Locomotive in gauge 1", if it can be done in G1, surely its possible in 3 1/2". I think Edgar WestburyDesigned a twin cylinder 30cc motor called 1831 for 3 1/2" G, and I think similar size 4 cylinder engines have been designed. I don't think you would need quite 105cc, although you want the crankshaft power to be around twice the power you expect from the generating system, and still keep the revs down for normal running. isc
This looks to be pretty much the same set up, but using a battery rather than another generator to excite the alternator. I'm surprised that with all the electronics now appearing in Model Engineering that someone hasn't come up with a proper design for an I/C-electric control. The article says that 24v dc motors are used, but the alternator voltage gets up to 40v-50v?
It seems that it is possible to build such as system, but it needs a bit more design work by someone electrically minded to make sure it will all work ok