A Special Rudder Linkage

Discussion in 'General RC Boating Forum' started by Jim Allen, Mar 22, 2019.

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  1. Mar 22, 2019 #1

    Jim Allen

    Jim Allen

    Jim Allen

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    This rudder linkage was designed to allow right rudder actuations to be done by pulling the rudder rod rather than pushing the rod. All the linkage moving metal parts are made of AISI O-1 full hard tool steel. Metal to metal bearing points are insulated with machined teflon pieces. The mechanism works very smoothly & is designed to last indefinitely. A hardened steel 1/8" rudder blade is mounted in the precision machined slot.

    Jim Allen
     

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  2. Mar 22, 2019 #2

    Terry Keeley

    Terry Keeley

    Terry Keeley

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    Nice! What a fertile mind...
     
  3. Mar 22, 2019 #3

    Danny King

    Danny King

    Danny King

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    Very nice.
     
  4. Mar 23, 2019 #4

    brad nichols

    brad nichols

    brad nichols

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    Too many little pieces for big fingers, but it does look nice!
    Brad
     
  5. Apr 3, 2019 #5

    David Santistevan

    David Santistevan

    David Santistevan

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    Love the engineering!
     
  6. Apr 8, 2019 #6

    Jim Allen

    Jim Allen

    Jim Allen

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    Special rudder blades are being made for the special rudder linkage. They are 1/4", full wedge, 7075-T651 aluminum blades that have a 5/32" water inlet hole. The ID of the entire water line is 5/32" ID, without any restrictions, up to the engine. This will be the largest water inlet hole ever to be used in a blade of this thickness which has a tapered back edge towards the bottom. At the point where the side of the blade's inlet hole is placed the rudder will be .215" wide. This means that both drilled holes must be on center which will give .0295"/side wall thickness at this point. I use a precision angle block to hold the rudder blank square in two axes for drilling the back edge water hole. Another fixture will hold the rudder blank for the blade's 5/32" ID side water inlet hole drilling operation. This same fixture will be used for the rudder's final wedge shape. The rear water line barbed fitting is pressed into a bored hole. The last photo shows how the side 5/32" inlet hole is started on a flat surface after clamping an additional 1/4" thickness to the blank's side.

    Jim Allen
     

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    Last edited: Apr 8, 2019
  7. Apr 9, 2019 #7

    Hydro Junkie

    Hydro Junkie

    Hydro Junkie

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    What size and style hull is that designed for?
     
  8. Apr 9, 2019 #8

    XtremeRcBoats

    XtremeRcBoats

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    Nice work Jim, as always.
     
  9. Apr 9, 2019 #9

    giuseppe gallegra

    giuseppe gallegra

    giuseppe gallegra

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    Hello Jim, this is very innovative rudder,congratulations.I'm very interested, Please let me know if it's for sale?
     
  10. Apr 9, 2019 #10

    Terry Keeley

    Terry Keeley

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  11. Apr 11, 2019 #11

    Jim Allen

    Jim Allen

    Jim Allen

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    Both hardened steel & aluminum rudders are used on large size riggers & cat type boats. The two type mounts shown are interchangeable as well as all of the blade clamping devices. The blades when mounted can be in only one precise location for the clamp screw & shear pin to pass through. There is a hardened steel piece pressed into the rudder that will cut the shear pin without damage to an aluminum rudder blade. I can easily change the riding attitude of a boat by changing the width of rudders that have the same shape but different wedge thicknesses. Wider thickness rudders, typically 1/8" to 1/4", of the same shape, always generate more lift, even when their bottoms are rounded. The most important thing is to make sure the leading edge is perpendicular to the water line at speed. A tapered rear edge seems to make the rudder less sensitive to incorrect mounting.

    The photos show the new fixture mounted for drilling the side water entrance slot & milling the rudders wedge shape. The same fixture is used for both operations, only the rudder blank itself is inverted for the side milling operation. The rudder blank is turned end to end for wedge milling of opposite sides. A 5/32" ID hole is the largest hole possible in a 1/4" thickness full wedge rudder.

    Jim Allen
     

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