Instructables (MUSHU) Variation.

This variation has an update. New story to come soon…

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This yacht design and 3D printed files have been downloaded from Instructables. It was designed to work with a B-rig from a DF65. We have modified the body design and axles, to allow for rig changes and to stay within our set of rules. Huge thank you to the original designer for supplying such a lovely design.

I have made some variations on this design and am still developing ideas. The original swept-backed wheels allowed the two axles to act as back stays, but I found that it was better to go for a single backstay like a DF65.

Straightening the wheels required shorter axles and it decreased the length of the yacht from 700mm to approx 650mm. I had to shorten the axles to stay within the 500mm width.

PS: the front bar needs to have a channel support for stiffness otherwise the forestay tension bends it too much. Leave the axles as original 10mm x 3mm aluminium to act as suspension.

NOTE: Rules allow for the rear backstay extension to be outside the overall length rule.

Original design: https://www.instructables.com/3D-Printed-Folding-RC-Land-Yacht-MUSHU/

Updated files that i used can be found here. More to come soon…

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The steering arm connector from 3mm threaded rod to tig welding stick.

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The back stay extension port added to the 3D design

You can use any wheels you like. Heavier skate wheels are great for stability, but slow the boat down.
Pic above: Model aircraft wheels from ali express adapted to the instructable hubs. The larger 4 inch wheels work well as they don’t need cutting, but I prefer the 3.5 inch https://www.aliexpress.com/item/1005007683059585.html?spm=a2g0o.order_list.order_list_main.4.3f351802Zy98nO Small wheels have to be cut with a circle cutter to fit. Try to get this right or the wheels take on a wobbly look… haha..

UPDATE: New hub file available that fits these wheels without any cutting. Just smash the original plastic out and glue these in… Suits 80mm and smaller aircraft foam wheels.

3D printed extra long winch arm and simple push button switch.
https://www.jaycar.com.au/spst-pushbutton-black-actuator-latching/p/SP0718

V7 OLY LAND YACHT BUILD LIST

TOOLS

• Phillps head screw drivers

• Allen Keys

• Spanners

• Hacksaw

• Drill

• 3mm tap

• files

• Soldering iron

PIECES

• Base (modified MUSHU)

• Middle (modified MUSHU)

• Top (modified MUSHU)

• Straight axle x 2 (modified MUSHU)

• Hex bolt axle tightener x 2 (MUSHU)

• Ali front beam joiner (MUSHU)

• Hex nut tightener for steering arm (MUSHU)

• Steering arm (MUSHU)

• Steering rod connector x 3 (OLY)

• Hubs x 3 (OLY)

• Winch arm (OLY)

MISC

• Electrical switch

• Wire extension for switch

• Rubber O rings (for weights)

• Steering arm yolks x 2

• 3mm stainless Threaded rod

• Stainless TIG rod 2mm

• Small backstay hooks x 2 (DF65 style or IOM fir backstay hook)

• 3 wheels

• Mainsail winch

• Steering winch

• DF65 sail. C, B, A, A+

• Wheels bearings

• Gorilla clear Gel

HARDWARE

• 4mm Lock nut x 4

• 4mm nut x 4

• 4mm x 25mm hex bolt x 3

• 4mm x 12mm Allen key bolt x 4

• 4mm x 38mm Allen key bolt x 1

• 4mm x 22mm Allen key bolt x 2

• 3mm x 20mm Allen key bolts x 2

• 3mm x 12mm Allen key bolts x 2

• 3mm lock nuts x 4

• 2mm x 10mm bolts x 2

• 3mm x 12mm screw x 1

• 12g x 12mm screws x 3

• 3mm x 25mm screws Phillips or hex x 6 (includes spares)

• Screws for winch

• Screw for arm

• 4mm Spring washers x 10

• 4mm flat washers x 10

• Aluminium 10 x 3mm bar x 2m

• Aluminium C channel 10mm x 10mm x 1m