80+ mph 32" rivercat

[kevinpratt823]

What is the problem?

Sent from my SCH-I535 using Tapatalk 2

[Spartanator]

The lipos fit, so he can run 8s.

[kfxguy]

What is the problem?

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With revolectrix batteries, I can run 8s

[Fella1340]

Are you going to give it a couple 8s passes? If the esc will handle it.....:) hello 100 plus mph! I don't know the setup well enough to know how much a stretch this may be on components. Good luck whatever you decide

[kfxguy]

Are you going to give it a couple 8s passes? If the esc will handle it.....:) hello 100 plus mph! I don't know the setup well enough to know how much a stretch this may be on components. Good luck whatever you decide

I tried. I posted in my other thread. Boat came off the water at 90+mph. I was a little over anxious on the throttle for that power level. I backed it back down last weekend and the water was rough and it was windy...so it came off the water twice on 6s. The first 7s pass I attempted, I stripped the flex shaft (which had just those couple passes on it right before lol) and I stripped the collet. So I made some improvements over the past few days. Here's some of what I've done. .....

I put an mbp collet...hopefully will hold better than the Octura I had. I had to modify a motor mount a bit. The collet is longer so I had to make a spacer on the motor mount and slide the motor forward a bit (to the front of the boat). I used some thick carbon fiber I had and cut to shape and then epoxy it to it. I also had to mill the slots, on the mount because the screw holes are a little wider on the neu motor (I guess?). Then I had to drill the hole a little deeper in the collet. The shaft is pretty long on the neu and it doesn't need to be...but to keep the resale value of it, I chose to modify the collet instead of cutting the shaft on an expensive motor.

Mount.



And I had to bore the hole bigger for the collet to sit close to the motor. I like the collet closer anyway because the further away, more chance of rotor shaft flexing.

[kfxguy]

And then I ordered some ceramic bearings to go in the strut. I also eliminated some excessive wiring. I have an m645 prop on the way that dasboata tuned for me. That right there should pick me up a few mph. Then I have a swordfish 240 pro plus2 to go in the boat (it's a good bit heavier than what I have now do a little front weight may help) after I run it with all the other stuff. I am making one change at a time so I can document what does what. I cycled all my batteries three times too. Now they are balancing perfectly. Aldo making a much better cap bank than what I have on there now. You guys know....sometimes the little things add up. I could throw a bunch of power to it and it would run the number, but I prefer to tweak it the best I can and get the most out of it. I'm gunning for 90mph on 6s and 100mph on 7s. I think i can get there.

[dasboata]

Freshwater. ... ... why?

looked like Salt water

[kfxguy]

looked like Salt water

Well I haven't tasted it but it's an isolated Lake that was the result of a gravel pit.

[Fella1340]

Somewhere along the line here you learned to be patient and it really shows with the results. Has the boat hit the water yet since the changes?

[kfxguy]

Somewhere along the line here you learned to be patient and it really shows with the results. Has the boat hit the water yet since the changes?

Yes. I was ran last weekend and Yesterday and today. I've had some issues. I'm getting them lined out. I had a bent prop from the 8s crash. Boat has never been right since then. It would flip on every pass...Wtf is up with that I was thinking. It took a while but I figured it out after messing up all my other settings (bent prop) So basically I'm having to start over. I ended up back in the 90's today but with partially drained batteries. It did 91.3mph at 4.0v per cell. I just got through taking the most of the boat apart. I'm getting rid if the motion wire extensions. Originally I borrowed the motor and it had the wrong connectors on it the owner did not want me to swap them so I made little 2" extension/adapters. Getting rid of those. I'm running a bec that's meant for 6s max. Well I've been running 7s.....it's lived but I'm putting the proper one in. I ordered some stainless tubing...it's going to do something nicer with the cooling lines. I'm changing the stuffing tube seal bearing to a sealed ceramic. I'm adding sealed ceramic bearings to the strut like my original strut (well those weren't ceramic). Cleaning up the wiring and installing a smaller bec plug and running the wiring in one of those snazzy wire sleeves. Basically I'm cleaning things up and improving some stuff. I think the motor is going to get ceramic bearings too.

[Fella1340]

Sounds like it will be a real killer build and with luck reliable to, very interested to see how the ceramic bearings work out. The motor is the first place I would upgrade bearings. I look forward to seeing what happens next!

[kfxguy]

Sounds like it will be a real killer build and with luck reliable to, very interested to see how the ceramic bearings work out. The motor is the first place I would upgrade bearings. I look forward to seeing what happens next!

I can't find ceramic bearings for the motor. They are flanged so they are harder to find. All other bearing I either have or they are on the way. My stainless tubing for the water lines came in. I made a cap bank and replaced the caps on the esc with 50v versions. Also cleaned up the wiring. Here's the esc. ...

[Fella1340]

It looks ready to do battle

[kfxguy]

I had a little time to fool with it last night. Started putting it back together and Cleaned up the wiring and cooling lines. Much better I think. It's not quite done but here's a peek at it...

Before


After.....

[srislash]

OK, enough with the beauty contest Trav, lets get it back in the water