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grendel

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Posts posted by grendel

    Lesson in complacency, Batteries they're safe or are they?

    in Broads Chat

    Posted

    the battery isolator should be close to the battery to minimise the run of wiring, personally I would have a isolator solenoid with a remote switch for preference, this would be a fail safe method as you would be remote while switching. in an explosion rated package.

    I have also been the subject of a battery explosion (internal fault - battery exploded when I turned the key on a van) in my case I was in the van and the battery in the engine compartment, so I avoided the spray of acid, but battery shrapnel was found up to 30 feet away, so presumably the acid went at least that far.

    Suffice to say, having seen that I dont want to be around if a battery goes up.

    I have also seen the effect a battery has on someones finger when they accidentally short across the terminals when using a screwdriver and their wedding ring touches screwdriver and the other battery terminal, having the wedding ring cut off was the least of his worries, for a while they were worried about saving the finger. (moral, take your rings off when working with batteries).

    I too work in the electrical industry (in the drawing office) we work at up to 33,000Volts, so we have a great respect for the stuff.

    Grendel

    Hand rails and gas lockers

    in Technical Questions and Answers

    Posted

    if your boat was a Broom, I would suggest Broom handles  :naughty: . sorry..

    how about looking at stair handrails, though I think they are nearer 50mm.

    Hardwood or softwood? maybe approach a boatbuilder who makes bits for saily boats, quant poles, spars etc, I am sure they must have the tools to round off timbers to a desired diameter.

    Grendel

    Question for Strowager!

    in The Broadscot Lounge

    Posted

    we use a similar type of cable as pilot cables to run alongside 22kV and 33kV cable routes to provide the intertripping of the protection for each end of the cable routes, these come with a number of twisted pairs in a steel wire armoured PVC cable. (generally though we default on 19 pair).

    Grendel

    • Like 1

    MTB 102 | Your Heritage Afloat

    in The Norfolk and Suffolk Coast

    Posted

    I spotted LR's spelling mistake in the MTB102's email address, I only have one complaint about the filming, Griff remember to pan the camera round slowly, I have problems with the fast pans, by the end of the film I was feeling seasick, but still the content was so good I stuck it out to the end.

    (Griff don't take that as criticism by the way, it was meant to be constructive and let you take even better videos, even I have made that mistake in the past, ending up with video's I cant stand to watch - but then I seem to be sensitive to the effect.)

    Grendel

    Greetings!

    in New Members Say Hi !

    Posted

    welcome Rincewind, I know all about where your nickname came from, I believe I have read all of the Authors books - even Strata and the Dark side of the sun, not to mention the Bromeliad trilogy and carpet people, with the possible exception of the latest book out (unless that was Raising steam). Terry is one of my favourite authors.

    Grendel

    • Like 2

    Horsepower, revs and engine size

    in Technical Questions and Answers

    Posted

    with cars I can say that larger lower horsepower engines give better economy than smaller higher horsepower, take the example of 2 Volvos I have owned, one was a 2.0 litre turbo, on a smaller car, this averaged at 32mpg (if I was careful), my current, bigger- heavier Volvo with a 2.5 litre engine (no turbo) gives me an average of 36mpg on the same run (as most of the time it is doing less work to keep me moving)  The actual BHP for the two vehicles is practically identical (that is pulling power vs weight, or towing power) as both are capable of towing my caravan easily. Neither has as good economy as the Volvo before those with a small 1.4 litre lean burn Mitsubishi engine which could average over 45 mpg on the same run, but then that couldn't tow my caravan (to be honest it sometimes struggled to pull itself).

    sometimes that bigger engine can deliver the same power with less effort and thus gets the better economy.

    (well that's how I see it anyway)

    Grendel

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