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MOTOR SAILOR LIFEBOAT....running on pp9 batteries

pp9 batteries

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neil howard-pritchard15/05/2020 13:55:53
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next summer [ cancelled from this June due to covid19] 4 nutters are going to sail the length of Windermere with model lifeboats [mine is in the build blogs at the moment] to raise money for the RNLI.

The other guys are going with bigger boats up to 70" long, and stuffed with batteries.

I tried this 9 years ago with similar boats, but the battery capacity was enormous and my motors burned out.

this time I am going with sail as main power with an auxiliary Buhler 11 pole brushed motor running on 12 - 24 volt power just to get me out of any trouble with lake steamers and grockles in Tupperware boats getting too close whilst having a look.

as I don't really want to pay 60 quid or more on ni am or li po rechargeable batteries, I was wondering if I could run the motor on 2 x pp9 disposable batteries run in series to give me 18v.....mid motor range, and if so how long would they last. my buhler motor draws 1.5 amps per hour on full load.....but as I said I would only be using the motor for short bursts to get me out of trouble.

would

Bob Abell15/05/2020 15:03:49
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I remember you doing this reckless crazy escapade in 2012, just as my Great Eastern adventure was announced

It sounds very challenging Neil.....Are you sure it`s safe?

How many miles does that entail?

Rather you than me, Matey Boy!

Bob

Dave Milbourn15/05/2020 15:12:09
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Neil

Zinc-carbon and alkaline batteries are designed for low current supplies e.g. a torch bulb or small radio. Even though your motor draws only 1.5A that's asking a lot from a dry battery. The short answer is "I don't know - try it and see" but at a fiver apiece you might regret it, especially if they fail right at the moment you need the motor to get you out of trouble. I'd love to be proved wrong!
Why not contact Component-Shop and see what advice they can give you? You certainly don't need to shell out sixty quid.

Dave M

Ray Wood 215/05/2020 15:23:04
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Hi All,

Is it April the first again ??

PP9's are those tiny batteries for transistor radios etc the sort you used to put your tounge on as a kid?

Or am I missing something !

Regards Ray

Dave Milbourn15/05/2020 17:46:41
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No, Ray - they're PP3. PP9s are the ones with similar press-stud connectors but they're much bigger. PP9

"Tounge"??

DM

Colin Bishop15/05/2020 18:21:58
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So, just .25 amp hour capacity and the motor draws 1.5 amps? That makes about 10 minues max running time at full speed but more if just trolling- is that right?

And what if the wind is in the wrong direction? Assuming it is on the beam then you would have to tack up the lake which will pretty much double the distance.

Colin

Ray Wood 215/05/2020 18:27:25
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Hi Dave,

Yes I Can't spell either, all I left school with was O level technical drawing & metalwork, but did ok because I had some common sense, not at battery recognition unfortunately 😄

Regards Ray

Colin Bishop15/05/2020 18:43:04
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Not sure that argument holds water Ray. I managed to scrape together three A levels and that didn't include battery recognition either. It was just the start of my real education which I picked up after school. If I wanted to know about something then I simply read up on it and in those days batteries came in all sorts of varieties including wet lead acid, Nife cells , zinc chloride, DEACS and the new kid on th block NiCads. It was never rocket science and the modelling mags had tons of information on them.

Colin

neil howard-pritchard15/05/2020 18:43:19
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Posted by Bob Abell on 15/05/2020 15:03:49:

I remember you doing this reckless crazy escapade in 2012, just as my Great Eastern adventure was announced

It sounds very challenging Neil.....Are you sure it`s safe?

How many miles does that entail?

Rather you than me, Matey Boy!

Bob

oh yes, Bob as safe as we can possibly get it. we have the Windermere branch of the RNLI monitoring and keeping a close eye on us from time to time on an exercise ,the Windermere park rangers doing some escorting and keeping folk away from the boats with their rib, as an exercise, and we have two support boats for us hosted by the Royal Windermere Yacht club also volunteered their services.

the RNLI are having fund raising stalls at both ends I believe,as we did at Loch Ness and the Windermere steam Launch Museum are having a 3 day trade and model boat show helped and organised by the Windermere model boat club over the same weekend, with an evening do on the Saturday night.

our lunch time stop is at the museum, I think.

the organisation that has gone into it has been amazing, by Steve Bennett, who has shown his lifeboat model that is going to take part at many shows over the last two years, only for this dreadful covid19 to thwart us at the last moment, but we will be back next summer

neil howard-pritchard15/05/2020 18:53:32
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Posted by Dave Milbourn on 15/05/2020 17:46:41:

No, Ray - they're PP3. PP9s are the ones with similar press-stud connectors but they're much bigger. PP9

"Tounge"??

DM

thanks Dave, I knew you would bail me out before I made a fool out of myself in the middle of Windermere, lol.

so the next question is...…...I bought this set of batteries some years ago for my ST 200 Sea plane tender but only ever sailed it once and the batteries were put aside and sadly overlooked. I have tried to charge them with a 50mah charger that I use for my tx/rx batteries, and it is either not pumping in enough juice or the batteries are now in a state of permanent comatose ………..is there any way of resurrecting them, or will they just become more weights for gluing decks down.

picture is of the two battery packs and the Buhler motor I will be using.

cheers for all your help and knowledge. neil.

img_4780.jpg

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