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1/10th scale Hydro Build

Old 07-06-2021, 03:44 AM
  #126  
Vilante
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I can't for the life of me get the cooling jacket on the motor. Any tips? The o-rings just seem too big, but checked it's the correct cooler etc.
Old 07-06-2021, 05:11 AM
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Lithium grease or dish soap usually works. The o-ring has to be a tight fit or it won't seal and, if that happens, you will lose all of your electronics due to water shorting out the components. Something else you might try is to throw the motor in the freezer for a few hours . The reason for that is the motor's metal parts will slightly shrink, giving you a bit more room. You don't want to do that with the jacket as rubber(and rubber like compounds) expand both when they get hot and when they get cold(back to beginning science on that one). If you try the freezer, DON'T TRY TO SPIN THE MOTOR UNTIL IT WARMS UP OR IT CAN DAMAGE IT. As you are probably aware, different kinds of metals have different expansion rates so getting it too cold could damage some of the parts if they contract either more or less than others around them
Old 07-07-2021, 01:44 AM
  #128  
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I ended up breaking an o-ring, doh! Got the other one on but took a little chunk out of that too. On enough to mock it up etc but will have to get new rings and try again.

This is the mounting spot for the rudder on the plans, do you think it's ok or should be closer to the center?​​​​​​​




Old 07-07-2021, 03:18 AM
  #129  
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I would move it in so that the pivot pin is centered on the stringer. Otherwise, looks good
Old 07-08-2021, 08:41 PM
  #130  
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This is what I'm thinking for the bend in the stuffing tube. Is this gentle enough?



Old 07-09-2021, 02:11 AM
  #131  
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It looks like this will have to be the layout. To get the batteries in the ESC will have to go toward the back with the servo. It will mean running wiring fair way but not sure how to avoid that/



The motor is currently 1/8" from the bottom of the tunnel. I could get it lower but it would mean a hole in the tunnel which I'm not keen on.



Old 07-09-2021, 03:24 AM
  #132  
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So, you're saying the ESC won't fit forward of the motor? IF it will, it would work better to reverse the batteries, leads pointing forward, and connect the batteries with a "Y" so you will have the batteries in either parallel(longer run times, less speed) or series(more speed, less run time) as you desire. The shorter the wires, the less voltage loss and less chance of burning up a wire. Having the receiver in the back would be better, weight wise, since the receiver is several grams lighter, on average, than an ESC. You could move the motor aft a bit, giving more room for the ESC in the front as well. Is the ESC water cooled? That could make a difference in location as well
Old 07-09-2021, 03:44 AM
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I could get it right up in the nose but I'd have to route out some timber to get it lower in the chassis.

It would mean it's right next to the motor. Cooling would be tricky but could go either side of the motor and then back over the top.




Old 07-09-2021, 03:53 AM
  #134  
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I could also mount it above the stuffing tube, it would need a mount I can easily remove. The nose option might be too tight, might get hot jammed in there?


Old 07-11-2021, 02:55 AM
  #135  
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I think it will have to go in front of the motor and the motor will have to move back. Either way I'll have to figure out the cooling lines. The timber either to the side or in the nose will have to be modified to get the cooling in there. I weighed it and the balance is pretty much 50/50 as you see it here so it may not be a huge issue.


Old 07-13-2021, 01:48 PM
  #136  
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And that, my friend, is where R/C boating gets fun. Figuring out how/where to run wiring and lines is where it gets challenging. I've got it pretty much down as for the nitro and petrol boats but, with the electrics, still trying to figure that one out since there are more parts involved
Old 07-17-2021, 03:46 AM
  #137  
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Well, had a very interesting experience with carbon cloth. I tried to put it down the tunnel one night when the kids went to bed.

What I learnt:
  1. Carbon cloth frays like nobody's business, and the runaway threads like to stick to anything with epoxy on it.
  2. You need to be better prepared that I was.
  3. It's hard to get it smooth and neat.
  4. It takes about an hour to clean up the mess you've made just to get back to square one.
Once I'd done that, I just ran some epoxy into the tunnel, thinking that'll be strong enough. Going to do the same in the seams of the sponson's and that'll be that.

I have glued in some fibreglass panel to mount the motor mount to, and made a motor mount out of the same material. Because there is a tunnel, I've mounted the motor through this mount so it sits down in the tunnel, about 2mm above the floor, and gives me a good angle.

Glued it all in tonight so fingers crossed.

ESC now goes into the nose a little as that portion of the nose is covered by the cowling so the motor wires can come back through above the deck. Next I'll get the stuffing tube mounted then I can move on to making some brass lines for the water to leave the boat. Slowly getting towards decking it which is exciting but plenty to do yet. We're in lockdown here in Sydney again so getting a bit more time to work on it though obviously which it wasn't due to the bug.


Old 07-17-2021, 03:50 AM
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I've also printed up a servo mount on my newly acquired 3D printer. It's the same weight as a standard servo mount (which didn't fit) but custom made to fit the boat. Noting that I'm not using that linkage, have something better on the way.


The CAD design.

I'll get a better photo later but this gives you an idea. Most of it will be under the deck so this way I can mount it to the bulkheads rather than the floor. Easily removed and less floor holes.
Old 07-17-2021, 11:27 PM
  #139  
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Just realised the stuffing tube doesn't fit into the end of the strut. Pretty sure it should? It's too big.

Have emailed the supplier.

These little delays really slow things up. I've put a heap of auto filler on the plug for the hatch, and it didn't go off. So I'll have to fix that. Having real trouble getting the ratio of that right, as it's supposed to be 50 to 1 product to hardener, and that's hard to judge in small amounts.

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