Yea I really didn't want to add any more weight, but you know sometimes it's a good thing at high speeds to help keep it down. Not good at high speeds for enertia tho. I weighed the thing the other night. It weighed 10.97lbs with 7s batts. I didn't think that was too heavy as my Rivercat weighed 9.7lbs. It sits in the water nicely. Doesn't sit to low. Doesn't have a problem getting on plane and doesn't handle funky (it did at first tho...whew I didn't even like driving it). I drove it around in some circles yesterday and it was pretty fun to drive and nothing got hot. I may give neu a call at lunch and see what they think.
Carbon shocker build
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Update. Kinda lost interest in it and been running the Rivercat. Well I decided since it was windy today I'd run the "slower" but bigger boat. Last time I ran it I was highly disappointed in it as I couldn't even break 60 on 6s. Boo. I was running a x450 and a abc 1915 that Dasboata did for my buddy (buddy sent it to me because I damaged mine) and rounded the tips and I thing reduced the pitch. It was intended for the 57k rpm my buddy was turning so I guess my boat didn't like it. So I did me up another 1915 abc prop and tried it out. Boy was I surprised! The best 6s pass I could muster up before with a regular 1915 was 65ish. Today I went 76.6mph. Only thing I did (that I can remember) is change the strut position a little. Then on 8s it went 85.7mph but I couldn't run it out in this lake. Was too small and the wind and water was making me nervous. This is still the 1440kv motor. I have the originally intended 1650kv motor waiting to go in soon. Honestly I think this has 90 in it if I could stay in it.
My 6 year old was videoing and accidentally cut it off before the gps was shown (no biggie anyway) so here it is
And here the video showing how I was only able to blip it. (Note, there's an island in the middle barely under the water that you can't see, I didn't want to hit it so I was very nervous about running it in this lake)
You can hear the wind too
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Hmm. Not sure what the point of the whole removal or rounding off the tip of those props was, but i'm sure current was greatly reduced using it. Perhaps you can compare.
Get yourself some proper logging already :P sounds like you might actually need it.
The shocker looked like it was a millimeter away from actually flipping if you kept going there... probably why it went so much faster too (wind must of been helping it air out ? lol)
Btw, in regards to going up in voltage -- why not go up to 9s or more to max out the motor's limit? Can't you just go with smaller packs as you're going up in voltage...
Besides I don't think half a pound or more of weight is gonna make much of a speed difference... It's not like you're drag racing.Last edited by dmitry100; 01-24-2016, 12:17 AM.Comment
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Hmm. Not sure what the point of the whole removal or rounding off the tip of those props was, but i'm sure current was greatly reduced using it. Perhaps you can compare.
Get yourself some proper logging already :P sounds like you might actually need it.
The shocker looked like it was a millimeter away from actually flipping if you kept going there... probably why it went so much faster too (wind must of been helping it air out ? lol)
Btw, in regards to going up in voltage -- why not go up to 9s or more to max out the motor's limit? Can't you just go with smaller packs as you're going up in voltage...
Besides I don't think half a pound or more of weight is gonna make much of a speed difference... It's not like you're drag racing.
The prop was modded for another boat. Like I said my buddy sent it to me because I didn't have another 1915 after I damaged my original.
I have a sf300 lite in it, it has data logging. It's not even breaking a sweat where I'm at right now.
It was on the edge because that water was a little rough for those speeds and the wind was blowing pretty good. On smooth lake and no winds, it is more stable. I ran it in another lake right before that and it was more stable but I didn't notice some yahoo had his fishing poles stuck in the ground at the other end and had his line casted out. When I was checking for people fishing, I was looking for people and not just poles. So I ran over his lines, needless to say I stopped running in that lake. Also when I went 76 on 6s everything was more calm do its not the wind helping it
I'm thinking about stepping up to 9s but this motor isn't the one intended for this boat anyway. I might swap motors and not have to worry about 9s. I have a 1527 1640kv for it.
Only reason I ran this boat is I knew in these conditions my Rivercat wouldn't handle it (I confirmed it after this, it flipped 4 times so I put it back up). After the pretty lackluster runs I originally had with it, I wasn't expecting much but I ended up pleasantly surprised. It's been sitting on the shelf just looking pretty and I figured I'd get back to it another day. Now I know it's a great 6s setup in mildly rough conditions and I ran it for a while on 6s. It runs in the 70's and turns pretty decent. So I'm pleased with that aspect of it. I'll get better speeds out of it with more run time.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Ran a new best again today. Water was still rough where I was but it wasn't windy so I was able to hang on to it. The batts were drained because I made the first few run up and back down the lake with heat shrink on the rudder (finger protection lol). Ran 74 with heat shrink on. Hahaha. Then I took it off. Cells around 4.10v and it went
It's got more in this setup but I'm swapping motors to the one I really wanted in it.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Ran again today. Was still windy but water wasn't as rough. New best. I went up on kv by 200kv and it picked up 10mph. Sweet. All time new best for me. And I backed it up with another pass. Both passes went identical speeds. Now all I need is a little more prop. I'm gonna shorten the battery wires because when I did that on my Rivercat it was worth a couple mph before I make any other changes. And dimitry, I made no changes to the boat ride attitude, battery placement or prop. All the same as last weekend when you said it was on edge. I knew it wasn't the boat, it was bad conditions. It still wasn't perfect today but this boat isn't that picky.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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I changed motors. You didn't read above I said I went up 200kv? I had a 1530 1440kv in it and swapped to a 1640kv 1527 which I believe has better top end power. I ran yesterday 88 with the 1530 and no changes from last weekend. Same conditions. Same temp. It went 72 on 6s yesterday with the 1530. Went 79 today with the 1527. I'm using the same gps. Once I verified that the garmin and this gps read the same I feel comfortable trusting this one. This one has less glitches too. The garmin has an anomaly every now and then and I have to reset it. I've had four of them and they all do the same thing. I'm about to lose 11" of power wire too. That picked up mph on my Rivercat. May swap to 8mm bullets on the motor also but one change at a time.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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How bout this. Last weekend I hit 76 once on 6s with the 1530 and the garmin. Then the garmin started acting up (reading 7mph in my rigger) so I reset it. Made several more passes on 6s. All passes were 72-73 after the reset. So I take the 76 as being an anomaly or glitch. Yesterday I clicked off 72 mph on 6s with THIS dynamite gps. So the same as the garmin. Then I swapped motors. Ran today. 79 with new motor. I backed up the 98 twice. You can tell in the video it's moving.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Oh ok, I guess that would explain it -- thought you were running 4s or 6s or something still. So thats like a 55k vs 48k rpm difference unloaded @ 4.2v per cell.
How come you're not hitting 60k or so?
Surprised that you see that much difference in just shortening of wires. Perhaps you need more caps? You should look into trying out a parallel/series cap bank like in the Pre-Emptive Cap thread.Comment
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Oh ok, I guess that would explain it -- thought you were running 4s or 6s or something still. So thats like a 55k vs 48k rpm difference unloaded @ 4.2v per cell.
How come you're not hitting 60k or so?
Surprised that you see that much difference in just shortening of wires. Perhaps you need more caps? You should look into trying out a parallel/series cap bank like in the Pre-Emptive Cap thread.
4s is on my 32" cat. Two different boats I'm messing with. It went 96 on 4s.
I have an (8) 1000uf 50v cap bank. The batters as come from revo have super long wires with the connectors on them. It's worth a Little to shorten the wires. I'm cutting 2.75" off each wire (4 wires total) so that will be 11" off these batts. It does help believe it or not.
Actually it's not turning that kind of rpm. Under load it's definitely not 4.2v per cell like your figuring. Here's the log. Numbers of notable mention:
Temp was 107f max (75f degrees today and the water wasn't cold but it was fairly cool)
Max rpm was 42,039 but average through the run was about 41k
Voltage dropped to a low of 28.5v and averaged about 29.6v (which is the standard 3.7v per cell I figure my kv off of)
Max current was 281 but through the run it leveled off to about 190-200 and at the end at top speed it was only pulling 170ish amps. Means that next prop i go with isn't gonna make it break a sweat.
image.jpg32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Thanks! I'm not messing with it or selling it this time! Every time I get close I either mess with it, sell it or sink it. Lmao. I have a plan for next weekend. I lost 11" on my wiring last night and I plan on warming the lipos next time even though I don't like doing that.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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