Having promised to continue with yesterday's account, here is a bit more:
The proceedings were so exciting, that I completely forgot to grab my camera! Rich did record the tests however on his mobile, but the best I can show is a couple of low resolution screen-grabs - if R doesn't mind the cheek?!
Although the order is wrong, this next image shows how the temporary test rig was set up (minus the 12V battery):
Rich and me were so keen to try out the loco under load, that despite an unrelenting drizzle coming down, we decided to cover the vulnerably exposed electrics with a clean, fresh rubble sack and take a chance!
I had after all previously declared that when completed, this loco should have an "all (but the worst) weather capability!"
The contraption did look rather odd - and perhaps a bit like some form of anti-commercial/industrial espionage measures had been applied?! It did succeed in keeping all the important stuff dry though!
There was some amusement to be had on two counts:
First, blindly searching for the dangling controls, let alone twiddling a miniature potentiometer under the covers - especially difficult for Rich, one handed when trying to hold his mobile with the other!
(No, stop smirking you naughty peoples)!
Secondly: Without couplings, the outward journey relied on pushing the tender, but for reasons that I will describe in a moment, the return trip required holding on with one extended finger!
(Right, that does it)!
Seriously though, I am damned glad we did it in such wet conditions, as it revealed some very interesting points for consideration!
The main concern had been whether our 100W motor would be up to the task. Surprisingly, there is not an awful lot of information published out there on the web, where it would seem few are prepared to discuss such matters. On the rare occasion that they do, most seem to strongly advise using nothing less than 150W, or sometimes more - and then only when paired!
Well - the little beastie turns out to be a flyer - in more than one sense! There is definitely no issue with stalling from a start or climbing our gradients! There seem to be bags of reserve power under there - quite enough for us anyway! It is a bit of a growling animal - that is fearsomely fleet of foot too! Every witness unanimously agreed that some kind of limiter or governor would have to be installed to prevent small persons from potentially becoming airborne!
Despite having attempted to reduce the axle speed with an extra gear shaft and sprockets, I will clearly need to reconsider the ratios! Otherwise, there can be no doubt that if the minors do manage to stay on board, especially at the top curve, they could traverse the entire circuit in a matter of seconds! Surely great for the them young'ns, but for us boring old fa... I mean grownups, we fear the likely consequences!
I know I have mentioned several times before that Mr. O., is our keen gardener, but it has to be said that he is a fair weather one - so not quite
that keen! He will never be caught in a Sou'wester, wax coat or wellies! As a result of that, and the fact that he has been engaged in other vital spare time duties, the railway has taken on a slightly overgrown - if delightfully bucolic aire! It may be a charming re creation of a narrow gauge byway, but the combination of copious moisture and squished foliage is absolute murder on the motion!
At the moment, it is not so much the horsepower, but traction that is the big problem. While I am aware of hoping too much that a single powered axle (with traction tyre) might have been sufficient - the hopelessly spinning wheels on the slightest deviation from dead level (despite the prevailing conditions) clearly prove me to have been overly optimistic! Matters were marginally aided by leaning forward on the driving truck and placing downward pressure on the loco battery box with my free arm and hand, but it is abundantly clear that the engine, even when completed, will still be far too light. The crazy thing is that we have just had (by an extraordinarily generous gift) our old, original but desperately draughty sash windows replaced, and the contractors quickly removed the remains - including what could have been handy in the form of the cast iron counterweights! Eternally grateful in my dotage for the comforts of double glazing, I may be, but damn and blast it, I shall have to search for something else similarly compact and dense for suitable ballast now!
The addition of more sprockets and using the remainder of our obtained chain to couple both axles should have been part of the plan in the first place! A priority now is to order a larger gear for the drive train to lower the top speed a bit further, while another to match the original reducer, and fitted to the leading axle, plus some extra links, should do the job nicely - and perchance, to tame the wild thing just a tad?!
Pete.