Recent content by SparkyTris

I guess in essence I am wondering in what situation it is "good practice" to short the coils on a generator? I seem to be thinking of it as short-circuiting a current source: one would never join together 2 of the three phases at a 400V mains supply just to get a higher current for a singlephase...

Pls excuse this posting which is somewhat off topic but purposeful to tap into a community without "accepted" bike-lore opinions. I am a stranger to the world of vintage bikes. An uncle who has become recently into nice old British bikes has asked me about wiring and converting alternators from...

what are the implications of using a 3 phase generator to deliver a single phase load? ie, just using one of the phases.

thought I ought to mark the occasion not that anyone cares

internal pointing. purpose (as I see it) is two-fold: 1. to reduce the natural dusting effect that would otherwise occur from the traditional clay filler-mortar material and/or lime-plaster render. 2. to give an aesthetic effect If framing & lining an internal masonry wall, the goal is to...

Quite so, but the stone can still spall in any orientation. is that bad? seems not as long as the layers cannot displace too far.

I see what you mean. I was meaning that the olden days were just different in so many ways, chiefly to this argument the perceived lack of time, relatively higher cost of labour, and harsher precipitation in this region meaning that doing it "properly" is no longer as viable as it was. so I...

why would the stones spall with evaporation?

I have developed a theory on which I would welcome comments Specifically Northern Orkney Islands traditional building, where the main material is locally quarried "Caithness Flagstone". The actual stone used in any given building is somewhat variable in quality, with certain stones being soft...

small (so-called inspection class) ROV. testign for insulation on the umbilical connection to a manual umbilical reel via sliprings. 500V DC nominal down the line. protected from lethality by a patent LIM

in the field, at potentials < 1kV, with "any old megger" I contend that: Insulation readings of >= 1Megohm on the megger's 1kV setting, indicates "good to go". insulation readings between 250k-1M: "keep yer back to it and lets see what happens when energised" insulation readings below 250K...

OK so ericmarks experience indicates that their may be significant differences between machines. I can see that fundamentals like mid-engine vs rear hub motor may be different. my feeling (and I admit that this is based on very scanty practical) is still that this is one of those...

Good shout, simple coulomb-counter.

Anyone got any experience bodging up e-bikes with BLDC hub motor at subsystem level? I have developed some broad theories on the arrangements so far, based on my vast experience of : guessing a diagnosis of failed and unidentifiable controller on one problem bike, taking a punt on something...

can anyone reccomend external PIR lights that will last some reasonable length of time? ideally >36 months