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  1. jurgenscraft

    Propellor modifications.

    I recently saw a article relating to holes being drilled through the sides of the proplellor, venting exhaust fumes out the side, I think ??. are there any advantages in doing this modification,and what is the purpose of this modification.Surely the possition and size of the hole drilled must...
  2. jurgenscraft

    Yamaha 55EL prop three or four blade ??

    I am currently running a Yamah 55el with a three blade propellor, the choices I have at the moment are,11 1/2 x 12 and 11 1/2 x 13 pitch. what would be the advantages I would experience by changing to a four blade propellor and what would the equivalent propellor sizes and pitches be, another...
  3. jurgenscraft

    correct battery use.

    I would like to use my two batteries as follows:<br />battery number one. starter, lights and non navagational equipment including vhf radios. This battery will be charged by the motor charging system while in use.The other battery will be used for navagational equipment and electronics but will...
  4. jurgenscraft

    Correct mounting procedure for gps and magnetic compass.

    Good evening, can any body advise me as to the correct distance I should keep between my magnetic compass and the gps and other electronic systems,on board my boat,or do these elecromagnetic fields generated by these electronic instruments have no effect on the magnetic compass, all the metal...
  5. jurgenscraft

    wood rot ,please explain.

    what, exactly, is wood rot, and what causes it to start and to continue, is it a organism that lives on wood . How do I stop the wood in my boat from rotting.are there coatings that prevent wood rot or stop existing rot,KIND REGARDS William Wright.
  6. jurgenscraft

    Marine ply info.

    Can any body out there explain to me, the difference between marine ply and normal ply wood.I notice that some guys use normal ply wood on their boats and apply marine varnish,I use marine ply and apply a penetrating epoxy, these guys recon that the normal ply wood will last just as long as the...
  7. jurgenscraft

    Battery cut out switch.

    Even though my boat's wiring is in good order and all circuits are fused, I would like to fit a battery cut out switch in the possative cable, so that, in the event of a electrical problem I can kill all electrical power,has any body tried this out, if so is the possative cable the one to...
  8. jurgenscraft

    bilge pump placement.

    The boat I have consists of the hull having 4 seperate compartments each interconnected by a 25mm hole drilled through each compartments allowing water to flow through to the drain plugs at the back of the boat, each compartment is fitted with a hatch so as to gain access, and for general...
  9. jurgenscraft

    Light strength / brightness rating CP or WATTS

    I have often seen spot lights rated in CP , candle power, all I can imagine is the brightness of that particular light, I am familiar with light globes rated in watts from which I can calculated the amps drawn by these particular globes, be it 55 watt or 75 watt or so on, but when a light is...
  10. jurgenscraft

    Fitting a regulator in charging circuit.

    Has anybody fitted a normal external type automotive regulator in line with the battery being charged,if so, do you have the wiring diagram.<br />The charging voltage on my YAMAHA 55EL tends to charge at about 15 volts at WOT.And about 13.5 volts at lower RPM (idle to about 3500 rpm.)
  11. jurgenscraft

    Night Cruising Lights

    I would like to mount a light on my boat so that I can do some night cruising,I have the normal navigational lights fitted. At the moment I use a hand held high power spot light which I have to recharge from time to time, I would like to fit a similar light as used in motor cars.Spot lights draw...
  12. jurgenscraft

    Seat restoration,

    I recently decided to restore the captain's chair on my cabin boat. The seat has been striped and the timber and foam rubber seat padding was found to be in good repair. just as a precaution I coated the timber with a low viscosity solvent free penetrating epoxy which will saturate and penetrate...
  13. jurgenscraft

    YAMAHA/MARINER OR MARINER YAMAHA 55EL

    My YAMAHA 55El vintage 1988 is brightly painted as a YAMAHA but has a information plate, giving serialnumber etc ,but this is in fact a Mariner disc, people in the "know" ??? say that YAMAHA manufactured motors for Mariner up until a certain Date, when was this date up until.And what in fact is...
  14. jurgenscraft

    Yamaha /Mariner 55EL thermostat question

    while I await the local manual guys to import me a manual on this particular unit I need the following information. Does this motor have a thermostat. I have looked but cannot find any thing on this particular motor that looks like a thermostat, or a thermostat housing, only a small hole high...
  15. jurgenscraft

    Anutha gps question.

    I am currently using a Sony Pyxis GPS which,Although,a little long on the tooth works well for my purposes, the possitional displays are good and accurate, how accurate are the speed read outs. I use this system instead of a speedometer,this particular has the options of showing knots, mph, or...
  16. jurgenscraft

    Charging voltage Mariner / Yamaha 55 EL

    the volt meter connected to the electrical system shows a voltage of about 14 to 15 volts when charging . What is the correct charging voltage and has this particular motor have a voltage regulator fitted in circuit and what happens as rpm rise will the charging voltage also rise if there is no...
  17. jurgenscraft

    hf antenna for amateur radio.

    I want to use a Hustler 40 meter, 7,000Mhz to 7,250Mhz, mobile antenna on my cabin boat.Has any body done this before and if so what type of a counterpoise was used if any, my cabin boat is constructed of wood and grp,I use a hand held for vhf and a shakspeare antenna for 29Mhzmarine frequencies.
  18. jurgenscraft

    what prop size and pitch.

    I have a Jurgens craft marine cabin boat , which is 4.5 mt long and is of the deep vee and reverse chine hull configeration fitted with a Yamaha 55 el two cylinder two stroke motor .This motor boat was designed and maufactured in South africa and is designed for carrying persons to the max load...
  19. jurgenscraft

    SONY PYXIS IPS-760 GPS RECEIVER

    I have had this unit for quite a long time but only started to use it recentely.<br />the manual states that commercially available map cards can be used.<br />I have tried to obtain these map cards here in South Africa,without any luck. Can any body help me with information , or point me to a...
  20. jurgenscraft

    tachometer for yamaha / mariner 55 el

    Can any body give me some information regarding a tacho for this particular type of older motor, where about would the electrical connections be.<br /><br />Regards Willie
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