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Re: Any feedback on size of a boat and size of the engine ?

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  • Xavier LUCAS
    Hello Jean Yves, How was your summer ? Not funny report about a trip in the US this summer ? Thanks for your comments, I browse again eclectispace web site
    Message 1 of 4 , Oct 16, 2007
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      Hello Jean Yves,

      How was your summer ? Not funny report about a trip in the US this
      summer ?

      Thanks for your comments, I browse again eclectispace web site again
      last week end and I enjoy the information. You can be sure that I will
      try to test my boat to get more informations on my engine this winter
      in the bath tube.

      I don't think that I will need a 40 mm pipe to do the engine. I will
      probably use a 8 mm pipe or what I will find here which is similar. I
      found some cheap balsa sheet and strip this afternoon so I will built
      the hull as light as possible, I will also use some mini servo and
      receiver and some "light" battery. For the heat source, I will try
      some "methanol" gel found in a hobby shope here and also probably I
      will try some alcool.

      I was very interesting this weekend by one of your article concerning
      the reduction of the exhaust pipe to get more propultion. I am not
      specialist in thermodynamic (even if I major in chemical engeniring)
      but do you think that I can use a 2 inch 6 mm exhaust pipe link to my
      8 mm pipe without any problem.

      I also appreciate some information concerning the lenght of the pipe
      outside the hull to get a better efficienty !!!

      Well first of I need as much information as possible to figure out
      what I am going to do and then I will try to build the hull. My major
      problem for the moment is to get an heavy boat which can not be run by
      the pop pop.

      Have a nice day

      Xavier
    • Jean-Yves Renaud
      Hi Xavier. Answers in blue on your message ... should get a thrust of 80mN. ... thrust, the best way is not to use a cylindrical nozzle, but a conical one. ...
      Message 2 of 4 , Oct 17, 2007
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        Hi Xavier.

        Answers in blue on your message

        > How was your summer ? Not funny report about a trip in the US this
        > summer ? Summer in Greece and French Riviera. No funny report.
        >
        > I don't think that I will need a 40 mm pipe to do the engine. I will
        > probably use a 8 mm pipe or what I will find here which is similar. I
        > found some cheap balsa sheet and strip this afternoon so I will built
        > the hull as light as possible, I will also use some mini servo and
        > receiver and some "light" battery. For the heat source, I will try
        > some "methanol" gel found in a hobby shope here and also probably I
        > will try some alcool.  Once optimized, with 2 pipes of ID 8mm you should get a thrust of 80mN.
        >
        > I was very interesting this weekend by one of your article concerning
        > the reduction of the exhaust pipe to get more propultion. I am not
        > specialist in thermodynamic (even if I major in chemical engeniring)
        > but do you think that I can use a 2 inch 6 mm exhaust pipe link to my
        > 8 mm pipe without any problem. Though it could improve slightly the thrust, the best way is not to use a cylindrical nozzle, but a conical one.
        >
        > Well first of I need as much information as possible to figure out
        > what I am going to do and then I will try to build the hull. My major
        > problem for the moment is to get an heavy boat which can not be run by
        > the pop pop. I like such a project. I had a 45 foot sail boat for 24 years. Now I have only a small Norwegian boat...and less worries.
        >
        > Have a nice day. Same to you. For me, today should be mainly used to test a 8 pipe engine. I started this morning. It works fine but I expect to increase the thrust.

        Jean-Yves

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