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    Schottel Propulsor
    by Willem ๐Ÿ‡ฉ๐Ÿ‡ช ( Master Seaman)
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    7 Posts 6 Replies 2 Photos 0 Likes
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    ToraDog
    Sub-Lieutenant
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡บ๐Ÿ‡ธ United States
    Online: 13 hours ago
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    Willem,
    PM me. I may be able to help you out.
    Jonathan
    Willem
    Master Seaman
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 26 seconds ago
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    Thanks for your suggestions. I looked at goBilda, but they seem to be sold out. I will try a servo expander, that should work with my old analogue transmitter.
    Thank you all for this fast and helpful answers.
    Maverick
    Master Seaman
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 9 hours ago
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    Why not try a large gear on servo connected to a smaller gear beneath the crane to give up to 360ยฐ rotation๐Ÿค”
    ToraDog
    Sub-Lieutenant
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡บ๐Ÿ‡ธ United States
    Online: 13 hours ago
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    I forgot to mention, that the goBilda servos will also provide 360 degree continuous rotation with full proportional speed control. They really are quite nice units. One need to purchase the servo programmer, but they only cost $10 and you only need to buy one once.
    ToraDog
    Sub-Lieutenant
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡บ๐Ÿ‡ธ United States
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    YES. There is a very good set of servos made by goBilda, see their page here: https://www.gobilda.com/2000-series-dual-mode-servo-25-2-tor...
    Both the Speed and the Torque versions provide 180 degree rotation out of box and up to 300 degrees rotation with a servo expander used. I have used the speed version, which is lacking in torque, to move turrets and torpedo tubes on my 1/48 Fletcher destroyer. I was very happy that, with a simple expander, they achieved 300 degree rotation, but I was disappointed by the low torque. I replaced them with the Torque version and could not be happier. Since that time, about 1 1/2 years ago, goBilda has come out with a higher torque servo. I can not determine if this new servo will give 180 degrees right out of the box, as the Speed and Torque versions DO.
    The company is very easy to order from and is very fast and responsive. I Think that they would be the ticket for you.
    https://www.gobilda.com/2000-series-dual-mode-servo-25-2-torque/
    ๐Ÿ”—
    roycv
    Chief Petty Officer 1st Class
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Hi ,there are several high power servos but in a standard servo size. Usually metal geared and you will not need anymore than a 6 Kgrm /cm power.

    However you will see several servos marked as 180 degree turning but they only work if they have a 180 degree driver.
    So you will also need a servo expander unit to fit between the rx and the servo. These are incredibly small items about the size of 2 servo plugs. There is a UK firm makes them and there are several available from China. Expect to pay plus or minus ยฃ10.

    But even if the servos are advertised at 180 or perhaps 160 degree movement they still require another unit.
    If you are happy with electronics and can take a servo apart then add a 1K ohm resistor to each side of the feedback pot and this will increase the total throw of the servo. You will need a bit of trial and error here.

    I do not know if modern computer tx's can expand the servo signal to match 180 degrees. I expect someone else will know.
    regards
    Roy
    Willem
    Master Seaman
    ๐Ÿ“ Schottel Propulsor
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 26 seconds ago
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    Does anyone know of a strong servo that rotates a full 180 degree?
    Last Christmas I got a 3d printer and decided to build the "ENAK", a floating crane were I could get plans and a lot of information on the internet. All the details I have to construct and draw; keeps me buzzy as well as the 3d printer.
    Now about the schottel propulsor, this needs to rotate a full 360 degree. With a belt there is a 1:2 rotation enhancement, but the servo has to deliver a full 180 degree.
    I noticed that servo's sold as 180 degree rotate only 90. So now I'm looking for a servo that really rotates 180 degree.



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