Twin powered carbon Rivercat build

[kfxguy]

Are you familiar with "The force"?

Lol

[keithbradley]

I typically machine mine out of aluminum, with a threaded hole and grub screw at the top, or make a "clamp" from aluminum or carbon fiber. Do you know what I mean?

[kfxguy]

I'm not very happy how the epoxy came out on the motor mounts. My fault. For one I decided to use west systems with some colloidal silica. Well I must have a bad batch of it because mine has clumps and I've got to mix it forever to get it mixed. But it leaves little air bubbles from the mixing, even if I apply heat to it, the bubbles stay. So luckily I didn't do the whole mount that way, I ended up switching to west systems and some chopped carbon. Those areas look better so I'm going to go over the other areas with it. I also coated the brass tube with 5 minute epoxy dyed black so I don't see an ugly gold tube. It's just for looks an looks pretty good. Had I known I had some carbon sleeve laying around I would have done the tubes in that. But when I found the sleeve I had already glued them in. O well, my next build I'll do that. This thing has no dang room so there not much I can do anyway.

[Luck as a Constant]

An easier way to make your stuffing tubes black is to just put some heat shrink over them


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[Mxkid261]

Man that has to be super tight in there Lol, I thought it was tight working on my single but that looks real fun. Those motor mounts look super trick!!

[Mxkid261]

Also, Im just curious how far in the sponson your drive tubes go?

[kfxguy]

An easier way to make your stuffing tubes black is to just put some heat shrink over them


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I thought about heat shrink but it would be hard to replace it on the other side of the stuffing tube support that I haven't made just yet. The epoxy does look good tho.

[kfxguy]

Also, Im just curious how far in the sponson your drive tubes go?

Bout little more than 1/2"

[keithbradley]

Travis, are you mixing with a brush or a tongue depressor (or something else)? A brush will put a lot more air into the mixture.
Also, if you ever do make the bayonet mounts yourself, consider the (counter) rotation of the motors and make them appropriately (left and right versions). Otherwise, with powerful motors, they can spin off the mount over time.

I think you will love the twin. Have you considered what props you will be running yet?

[kfxguy]

Travis, are you mixing with a brush or a tongue depressor (or something else)? A brush will put a lot more air into the mixture.
Also, if you ever do make the bayonet mounts yourself, consider the (counter) rotation of the motors and make them appropriately (left and right versions). Otherwise, with powerful motors, they can spin off the mount over time.

I think you will love the twin. Have you considered what props you will be running yet?

The way the slots are cut, the rotation on the motors force them to stay at the end of the slot instead of twisting it out to the hole on the end. I'm mixing imwith a mixing stick. I may be mixing it too fast. I'll adjust my speed. I'm pretty stressed out at the moment as I put an aluminum backing plate in the transom so I can drill and tap it so I don't have to fight with the nuts down in that tight area and while tapping it, I broke the tap off in it. Let me tell you there was almost a bunch of holes punched in the wall. Luckily I was mounting the rudder up high and I ended up moving it down some and it looks better any way.

Props... Well I've got some cnc 442's to start off with. Then I've got some abc 1615's and 1715's for it.

[keithbradley]

The way the slots are cut, the rotation on the motors force them to stay at the end of the slot instead of twisting it out to the hole on the end. I'm mixing imwith a mixing stick. I may be mixing it too fast. I'll adjust my speed. I'm pretty stressed out at the moment as I put an aluminum backing plate in the transom so I can drill and tap it so I don't have to fight with the nuts down in that tight area and while tapping it, I broke the tap off in it. Let me tell you there was almost a bunch of holes punched in the wall. Luckily I was mounting the rudder up high and I ended up moving it down some and it looks better any way.

Props... Well I've got some cnc 442's to start off with. Then I've got some abc 1615's and 1715's for it.

So they are left and right (the motor mounts)? Are they made to spin the motors so the props rotate in, or out?

Been there with the tap man...What a giant pain that can be.

[lt130th]

So they are left and right (the motor mounts)? Are they made to spin the motors so the props rotate in, or out?

Inboard rotation would keep the motors torqued into the slots. The mounts that tiqueman sent with my Shocker share the same direction in the twist slots, but they also have the top and bottom hole for four-bolt config, that will keep it locked in. Looks like Travis' mounts are the same. Is this not common for carbon plate motor mounts, cut to the sponson contour (the twist slots)?

20150716_224517.jpg

By the way, Travis, you better hurry up and finish this twin build so you can stay caught up with current trends. Keith is about to start building twin turbine HPR's (unless you just bought that bundle 'cause you didn't know what else to spend $15K on, haha). The next thing you know, everyone will be putting JetCat's in their Daytonas and Fantasms.

[kfxguy]

I just double checked. I have a left and right. Truth: first time building a twin. The motor mount direction is not something I thought about. Until now. I had planned on making the right side prop spin ccw and the left side spin clockwise. I guess this is called spinning inwards? Well just so happens the mounts are setup this way. I guess I had a 50/50 chance and I got lucky.

I got the servo mounted tonight a lot with the steering rod made up and mounted. All I've got left is a pass through fitting I have to machine for the boot to seal to. I'm thinking about a trim cover to cover the escs, bec, receiver and servo. I've got to figure out a shape I guess.


I also mocked most of it up. The Cg seems like it's going to end up exactly where I want it. It was an 1/8" forward of the Cg from my previous rivercats. I keep thinking that two props may create a little more bow lift than a single prop. I could be wrong.

[kfxguy]

Nothing special, just a couple pics of where I'm at.

[shua]

I'm really digging all the custom Carbon Fiber on this build! Awesome!!