The big ED - Modelling the class 74
Yes, this is the third blog in a couple of days. Don't expect it to become a habit! Some of you may remember this from RMweb mark 3, but since that's offline at the moment, I've popped up some constructional pictures on this thread (for those that like that kind of thing). Here's a sample:
It has to be said that not a lot has happened since that point. Until now, that is. The model has been painted and is in its proper livery, but is awaiting lettering and, in particular, glazing. Why now? Well, a chance meeting over Christmas means that it may make its exhibition debut and well, it would be good if it were complete, if not actually finished.
The most pressing problem is the mechanism. This, for those who were wondering, is based on parts of a Bachmann Warship (for anyone contemplating doing something similar, I'd recommend using a Heljan Hymek - it's much nearer the correct length). There's nothing terribly radical about this as a quick glance at Jim Smith Wright's New Street thread will show, the difference here being that this one is based around the etched floorpan supplied with the DC kit body. What follows is a lesson learned the hard way that RTR chassis conversions need a bit more thought than perhaps I gave it initially.
The issue was that the existing Bachmann motor and flywheels were too long for the bijou space available and were thus replaced with a Mashima 1824 and a pair of chunky (18mm diameter, 13mm thick) flywheels from Branchlines. Now, in all honesty, this wasn't a success. The 1824 is a fine motor but like most of the large Mashimas, rather slow revving. The resulting performance can be described as pedestrian, verging on sluggish, which is not what we really want. Real 74s were, apparently, flyers (if not especially reliable) so something had to be done. That something is a replacement motor - the old one won't go to waste, we have a use for it - a Mashima 1624 which has 7,000 extra RPM (18,000 relative to 11,000) and another pair of large flywheels. There is a slight trade-off in power, but I don't foresee that being a problem. Here's hoping it works...
Adam
- 5
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