Outerlimits SV43 build

[fweasel]

Trimmed up the push rod, installed a boot, and locked everything down. Now it's time to sort out the ESC mount.

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[Jesse J]

[Fast One]

You wouldn't happen to have the MTC website details by any chance?

[fweasel]

You wouldn't happen to have the MTC website details by any chance?

MHZ stocks some MTC hardware on their website, or you can order them directly from Christoph at MTC if you're not in a hurry.

https://www.mtc-powerboat.de/

[hughb]

That’s quite the novel solution for mounting the servo, great idea!

[fweasel]

That’s quite the novel solution for mounting the servo, great idea!

Thank you. I've seen it done that way on other builds and it seemed like a good fit here.

[fweasel]

I've been trying my hardest to not finish this boat. So far, I've been very successful with that, until this weekend. I found enough time in the workshop to modify the ESC mount, epoxy it into the hull, build a 12S cap bank, solder all ESC connections, dress the ESC receiver wire, mount the ESC in the boat, drill and install bulkhead fittings for cooling inlet and outlets, and run all cooling lines. I even got my padded cover from Werner in Germany. It fits perfectly.

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[fweasel]

I really wanted to install the water outlet under the rear overhang, but decided it was best to keep the stream visible since it's an aggressive SAW motor and prop combination. I drilled the hull and epoxied in a small section of 7/32" brass tube flush with the outside of the hull. It's will pretty much disappear once the hull is painted. Still unsure of both battery placement and how I'm going to strap them into the boat so I needed a temporary solution for the maiden run. Stuffed in as much foam as I had and cut a slot in the middle just big enough for two 6S packs stacked on top of each other.

Took the boat to the local pond today for the initial test run and of course, the sailboat club was there, which means I had to haul all of my stuff down to the far end. Got setup , bolted on the smallest big prop I had (ABC2214) and tossed the boat in. It didn't sink, which was victory number 1. Made two quick half throttle passes and brought it back in. Temps checked out, but little more water inside than I would have expected. I haven't done a leak check, so it's probably an easy fix. I did a quick pressure test on the cooling system to make sure I didn't have a pinched o-ring or a bad hose barb on the ESC. No issues there.

Sent the boat back out and made a few longer passes. Lots of chine walk. Speeds were probably mid 60's, still only partial throttle. Zero setup so far aside from a level trim angle and tabs raised up high. Turns terribly, but that's a known issue with this particular stepped hull design and not a problem for my purposes. Tried to give it a little more throttle to see of speed would settle the hull down, and it wiped out. I forgot to tape the hatch, took on quite a bit of water while the tug was pushing it back to shore. I run a neoprene hatch seal on most of my boats and forgot all about taping down the canopy before I sent it out. Once it was back on land, I noticed the drive hardware was loose, allowing the entire propshaft to wobble back and forth. It was plenty tight on the workbench last night, so obviously more loctite is needed. Wondering if that could have made the chine walk worse. I'll start playing with trim angle and trim tabs next time out.

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[fweasel]

Battery trays are finished! Just need to wait for them to arrive from Germany and get them fitted into the hull.

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[srislash]

It’s looking good Ryan, I love the servo mount. I should find one of these hulls with the overhang transom one of these days for my steerable drive system

[fweasel]

It’s looking good Ryan, I love the servo mount. I should find one of these hulls with the overhang transom one of these days for my steerable drive system

Thanks! Hardware that cool needs to be seen. I wouldn't hide it under an overhang.

[srislash]

Thanks! Hardware that cool needs to be seen. I wouldn't hide it under an overhang.

Actually if my center pivot was mounted above tHe stinger it would have the desired pendulum effect without all bracketry to fix geometry.
One day Ryan, one day.

[fweasel]

Ordered some black glass vinyl and stretched it on the canopy for some last minute windows. Turned out pretty good for my first time working with the stuff. Also poured about 1.5oz of epoxy and chopped fiber into the nose

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[fweasel]

Built a cardboard template so I could figure out where to place notches in the battery tray base to clear the stepped hull ridges. Ground them out from the base plate with the dremel and then glued it into the hull. I used large beads of black aquarium silicone on the bottom side to take up the large gaps without dripping down the hull on the initial installation round. Next, I'll go back and epoxy the side edges with G-Flex for more strength because of the reduced attachment surface area compared to trays in the bottom of a cat sponson. The cured silicone will prevent the epoxy from running down towards the keel and I can do both sides at once without having to tilt the hull while it cures. I also offset the tray slightly to the right by about 5mm to counter balance some of the ESC weight.

Once that was in place, I started to panic about a high speed crash smacking the upper deck of the hull. It's a lot of flat, unsupported surface area. I did a quick CF inlay on the underside of the deck and then spent the better part of 90min making a bulkhead support template from cardboard. I cut the bulkhead out from carbon plate. I was incredibly lucky that I had a piece in the drawer big enough for this shape. I cut out a relief hole in the middle so I can still stuff flotation foam into the bow. Took several test fits to message a few tight edges and corners, then I epoxied it in from the front face, and will go back and use carbon fiber cloth tape on the back side. The deck is already much stiffer and the epoxy isn't even fully cured yet. Should help with the crashing...


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[fweasel]

and I just ran out of resin and hardener... cutting this one close