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

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  • 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 1 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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