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Luigi Vercotti

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Posts posted by Luigi Vercotti

    Kiwi rescued after 2 days adrift in Dinghy in the Med

    in MarineTalk

    Posted

    Astonished that anyone would willing want to buy and rely on a Seagull in this day & age. I say this as a Brit

    who’s owned 2 and even visited the factory where they were made in an attempt to resolve ‘issues’ (far too many times).

     

    My last experience of our bought-new-but-never-worked-properly Seagull was watching my father lift it up over his head and throw it off the back of our 18ft trailer sailor at the entrance to Chichester Harbour. It’s probably still down there somewhere.

    According to Wikipedia, the late eighties models are the ones to avoid, would that tie in with your bad experiences? My experience, which was prior the then, is reliable and near bulletproof.

    marine deals

    in MarineTalk

    Posted

    Just get a bit nervous when buying goods online from an outlet I have no knowledge of.

    All good, thanks for the response.

    I'm South island based, so I rely on online stores more than people from the great metropolis up north. I've had some good gear and good advice too, when I call them.

    Battery charger an solar

    in TechTalk

    Posted

    Luigi - EMF / Electromotive force is going to describe changing another type of energy into an electrical energy and describe its potential for work [in volts]  ie: a wind turbine will convert wind energy into electrical energy,  is where you would use emf in your example/description.  A cell in a solar panel would be another great example.

    MCP,

    Battery EMF is the correct term and has been since I did my electrical technical education, many years ago. On technical matters, that is how think and speak. However, I.T. (Matt) is correct and terminology needs to be appropriate for the forum and discussion subject.

    Battery charger an solar

    in TechTalk

    Posted

    Id suggest that its a good idea to keep the details provided on a public forum to the most simple explanations and name conventions. EMF (Electromotive Force). Battery EMF is battery voltage.

    Fair cop IT. I was in full on mobile phone typing mode, which takes up about 90% of my brain power just to maintain legibility.

    Battery charger an solar

    in TechTalk

    Posted

    .... What about the battery EMF which is increasing as the battery charges? You can't say that the resistance is the charging voltage/charging current. The battery internal resistance will be (charging voltage - battery EMF)/charging current.

    I'll be generous and suggest I=R/V is a typo on your part.

    Anchor chain

    in TechTalk

    Posted

    I think it's really down to scope the anchor's ability to bury itself and the sea bed.

     

    For a 10:1 scope, the example Chris has used, the % of the force in the rode that acts in the horizontal direction will be 99.5%. The % of the rode force in the vertical direction will be 9.9%. If the anchor is of a type that digs in easily and the sea bed has enough sheer strength, the downward force created as a result of the flukes digging in due to the horizontal pull, only has to have a vertical component of greater than 9.9% of the force in the rode.

     

    When you reduce the scope to 5:1, the angle is increased to 11 degrees, which will give 98% of the rode force in the horizontal direction, but the vertical component has now doubled to almost 20%.

    PFD with integrated harness, or separate?

    in MarineTalk

    Posted

    I'm looking to buy a PFD and harness for coastal use and maybe further afield down the track. I'm not sure whether to go with integrated or separate harness. Anyone out there with opinions either way?

     

    I have searched for this, but couldn't find what I wanted, but if it has been covered already, please post a link.

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