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    Virgin Atlantic Challenger I
    by gcladd ๐Ÿ‡จ๐Ÿ‡ฆ ( Leading Seaman)

    2 months ago
    Resurrected a model that I build years ago from a set of plans published in Model Boats magazine (still have the issue with plans). Hasn't been in the water, but a group of guys involved in a sailing club invited me out to participate if I do not go to fast or create a large wake.

    it's powered by two Graupner 380 motors and Graupner gear reducer units. The current prop size I believe is a 20mm three blade, but I have two blade racing props that really make this sucker move.

    It does have operating lights that I never completed, so I should get that cleaned up while waiting for the arrival of new battery packs (still has 7.2 V Nicads in it).

    ๐Ÿ’ฌ Re: Virgin Atlantic Challenger I
    2 months ago by gcladd ( Leading Seaman)
    View All

    I recall that I had a similar problem to yours using the Graupner stock motors. Forgot this when I wrote the original post. I have a pair of Kyosho Lemans AP29's that I bought way back when to get it to ride on plane. These motor have a noload rpm of 16000.

    I would play with motors/prop diameters before attempting to rip out drivelines.

    I will have to put the Kyosho's back in the model and take it for a run on a weekday when there is no one else around that the speed or wake would bother on the pond.
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    ๐Ÿ’ฌ Re: Virgin Atlantic Challenger I
    2 months ago by JOHN ( Warrant Officer)
    hi there, I don't know what went wrong with my posting - but - anyhow, I built this model a few year ago of the original version of Virgin Atlantic Challenger - the one that sank. I had a similar motor setup to what you have in your model and it would never plane properly. I believe the problem to be where the prop tubes exit the hull; behind the last step; there is a build up of vacuum created by the props. This stalls the boat. It makes the boat underperform. In some future time, I intend to remove the prop shafts from my model and move them further back and also to make the prop tube angle slightly steeper to give the props more clearance from the back end.
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    ๐Ÿ‘€ 40 Views

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