Ok. I fixed the rudder slack. I measured it before. It have exactly .100 slack. Now it has none. I had a 3/16 shaft I used as the pin. I used a reamer instead of a drill bit to get an accurate hole. Perfect, no slack and smooth. While I was doing that I noticed I had a busted strut bearing. Evidently when I staked it in place with an automatic center punch I must have cracked it. Fixed. Then I marked the strut and moved it up exactly 1.5mm with no angle change. Maybe should raise it more but I guess less may be more at this point. I'm gonna charge the batts again tonight and see if I can make a trip to the lake tomorrow after work. It's killing me that it's so far out of tune but really is running pretty fast. This motor must make serious power. I was logging 7000w lol
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32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was -
You only need about 3500w lol"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
--Albert EinsteinComment
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7000W on 7s should be around 270A. Those are some serious amps
Looking forward to your next video!
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Yep I was logging around that area. Little much for my liking. i'm hoping to bring the amps down on the next run. At least the motor isnt staying in here, its for my 37" cat so it should pull less amps in a cat than in a mono. I'm jonesing to try the neu 1527 in it but Ive got to finish tweaking this combo first.Originally posted by Roy Van De Sande View Post7000W on 7s should be around 270A. Those are some serious amps Looking forward to your next video!32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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I can't think of any reason this setup should pull that many amps, it's not that wild of a setup. Do you have all the parameters set right in the data logging info? Cause if it's not, it'll read wrong data. How much timing do you have in it?Comment
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keith told me to set the timing at 15 degrees (first time running a lehner and mgm) so thats what i did. The prop is real deep in the water so i'm sure that has alot to do with it. plus its kind of an aggressive prop. i'm not sure on the parameters, i didnt change anything. I am educationally (lol at that word) guessing that the esc is limiting the current, thats part of the reason its only picking up 5-6mph when going from 6s to 7s. I usually see a 10 mph gain on decent setups and ive seen 15mph difference on my rivercat.Originally posted by flraptor07 View Post32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Keith would deffinetly know about running that combo, he runs a lot of them. I guess see what raising the strut does and go from there.Originally posted by kfxguy View PostComment
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Maybe try moving the strut/stinger up a few mm...........positive way. This will get some of the prop out and let it unload reducing amps and also possibly free up the hull(not so wet)NEED PARALLEL CONNECTORS?? QUALITY 5.5MM, 8MM, 8 AND 10 AWG, GET THEM HERE:
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i did raise it 1.5mm but did not change the angle just yet. i'm hoping to go run it again when i get home.Originally posted by Make-a-Wake View Post32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Just went run it again. Didn't go any faster but I did get some interesting data. It's a little more stable with fixing the rudder slack. That helped a little. Then I moved the strut up and down. Moved batteries. Messed with trim tabs. Tried several props. It ended up liking a smaller prop. Once I got it more dialed in it went 75.2 with run down batteries (3.79v per cell). I had made about ten test passes on those batteries and the last pass was only .2mph slower than my fastest pass on fully charged packs. I even drove it around for a bit before this pass. Now I feel confident it'll do about 77-78 with charged packs. Only one way to find out. My amp draw should be less now with a smaller prop too.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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good stuff, Travis!!Comment
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Just checked data log. With the smaller prop I peakies 355 amps for a millisecond right when I nailed it. Then amps level out quickly to 195-218. So much better. Controller temp hovered around 125-130f. Motor was barely warm. Connectors weren't warm. Batteries were barely warm.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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now, just need to cup that prop a bit more to increase the pitch.....That girl will be rollin!!Comment
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Here's a graph. You can see a trend. Some runs are on top of each other too because it took Amoy less time to change the prop vs the strut. Notice the one all the way to the right, that was my last run with the smaller prop. This run was with trim tabs flat and batteries at the rear most part of the trays. Check the highest one....I'd be willing to bet that was the abc prop. Sorry for the cheesy pic of my computer screen.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Very interesting Travis. Kind of a quicker/shorter run on that last one. Are you going to try a touch smaller prop again to see what it does or just a fresh set of batteries?
You know I am paying attention and learning from your logs for my LMT twin setup.
ThanksComment
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