NQD (Tear into) jet boat reverse bucket

thingiverse

If you make one please show it here and give it a like. Or if you think a change would improve something please comment. Video 1: https://youtu.be/jPulnKtUiBs Video 2: https://youtu.be/7LTETrX2Ruw Printing is done in PLA, as ABS would be stronger but more difficult to work with. I'm happy with the results of printing with PLA, and it works just fine for me. The bucket is modelled with strong beams to ensure good bonding with the build plate. My cheap Anet A6 printer has a tendency to come loose at other smaller attachment points, so I had to take extra precautions. To assemble the bucket, simply print without any support or brim and use a rotary tool to cut off the unwanted parts and sand the bucket smooth. After rebuilding the NQD Tear into it was much better and faster but I did not like the fact it could only drive forward. Time for some 3d designing. I modelled the back of the boat and the external jet pump parts to design around them. I had the option between a bucket attached to the transom or attached to the swiveling nozzle, and the last one seemed easier to me. The hinge points holding the bucket are pretty thin but never failed on me. Make sure all holes are drilled to size to accommodate the screws and bolts and make sure the bucket arms will fit in without too much force. If not, just file all burs and high spots. The bucket will fit perfectly. A bit of PLA needs to be removed from the top edge in one corner to stay free from the brass steering clamp when going forward and steering hard right. Make sure the steering actuator wire will not protrude through the brass clamp. Cut off any excess length (after adjusting the steering and you are sure the boat will go straight). The bucket is mounted with stainless M3 bolts and nuts with nylon inserts to hold them on without clamping the hinge. The actuator wire attachment point can be used with just a wire, but I added a similar clamp as used for the steering. This makes adjusting more easy and also mounting is more easy. The bucket will not interfere with water flow at forward movement in any way and also will not damage when sliding over rocks. And if there will be a broken part, just hit print and you will be fine. The only little downside of this design is that in reverse the steering is also in reverse. But the steering is very accurate and it can turn on the spot in backward position. The used servo is a TowerPro MG 90S from AliExpress. This will fit in the servo mount I designed for it. It's smart to waterproof the servo a bit since water can come in a bit now and then under the lid (silicone putty on the servo body seams and grease on the gears and bearing inside the servo where the driveshaft will protrude the body). A rubber bellow is put in a hole in the transom around the actuator wire to avoid water coming in, just like the original steering wire. Also available on AliExpress, just look for "rubber bellow RC".