1st 3d printed boat

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BlackSrow
Posts: 10
Joined: Sat Feb 03, 2018 9:36 am

Re: 1st 3d printed boat

Postby BlackSrow » Mon Aug 20, 2018 9:33 pm

Alright , both turbine are working , juste some minor leaking
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BlackSrow
Posts: 10
Joined: Sat Feb 03, 2018 9:36 am

Re: 1st 3d printed boat

Postby BlackSrow » Mon Aug 27, 2018 3:45 pm

pictures will come soon
after the 1st real test , i have some question
turbine are leaking what do you do again it ?
and coupling seem a little bit weak ? have you go problem with it to ?

admin
Site Admin
Posts: 177
Joined: Thu Jan 11, 2018 7:46 pm

Re: 1st 3d printed boat

Postby admin » Mon Aug 27, 2018 7:26 pm

I've ordered stainless steel ball bearings and stainless shafts. The couplings seems fine as long as there is no misalignment, but as soon as there is the slightest misalignment you will get friction heating.

Regarding sealing, I'm not a boat pro but I have designed it so that the forward shaft compartment of the water jet house should be able to work like a stuffing box, where you can besides a bearing also fill it with grease. Have a look at this thread: https://www.rcgroups.com/forums/showthr ... ts-discuss

The mention "black axle grease" and "Silicone Dielectric Grease", and I'm thinking of trying vaseline because it's easy to get hold of. It might be a bit thick though, so silicone grease could give better performance. Anyway, you can google for "rc boat stuffing box lubrication" and you'll probably get many hits. Also, if you manage to find an O-ring that is small enough you will need grease for it not to be damaged by the high surface speed. Another trick I've heard of is using rubber to make a custom seal, like cutting pieces of wide rubber band or even from a balloon. These are also methods that can be tested but I'm thinking they probably don't last as long as just filling the space up with a grease that is thicker than water. If you have a local hobby shop, you can go there and ask fro some grease to test for a stuffing box.

Regarding coupling, the space is very tight so I'm thinking of doing a compact version of the coupling in the attached picture. The idea is to use aluminium tube, a smaller diameter inner one that I drill a hole through and put a pin through, and a larger diameter one which can be made a cut in where the pin fits. In that way one can make a very compact version of this coupling with not so much effort, I'll post pictures as soon as my bearings and shafts arrive.
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BlackSrow
Posts: 10
Joined: Sat Feb 03, 2018 9:36 am

Re: 1st 3d printed boat

Postby BlackSrow » Sun Apr 07, 2019 12:25 pm

hi working like a champ , build an other one , also working like a champ , i 've add some water pump , everything is going well , designed and printed a trailer for it , i saw on thingiverse ( on the micro pump ) that you've got a small stand for the cb90 could i have the files

BlackSrow
Posts: 10
Joined: Sat Feb 03, 2018 9:36 am

Re: 1st 3d printed boat

Postby BlackSrow » Fri May 10, 2019 8:28 am

some pictures of my cb90s for you olle
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