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Always interesting reading what your experimenting with, why not try an air dam under the front of the tunnel to break air flow a bit. This helps keep the front down at the speeds your running allowing you to run a more neutral angled strut, something as simple as a large diam drinking straw taped across the tunnel around 2" in from the front of the tunnel works.
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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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Yes It Is FAST
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Well guys, just got back from the lake. I had a feeling that the rudder was going to be too short and not hold the nose down. I was right. I made a successful pass on 3s, although it handled a little wonky when getting on step....and I knew what was to come when I saw what it did. I did set a new personal best on 3s, but it don't matter because this rudder isn't staying. I did video it. I won't bore you with the acrobatics on the two 4s runs I attempted. I've been through this before so it's no sweat. It's a fine line of how long the rudder must be. I even tried the extra 1lb of weight from using the 5800 packs. Nope. Gotta go back to where I started on the rudder length. Seems like it's all lined up the same way my original Rivercat was. No problem. Here's the 3s run...my 6year old videoed for me so excuse his little fingers over the camera a couple time lol. He did a great job tho!
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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And I wanna add, I usually drag the run out in the first pass when I make a change that could possibly cause it to take flight. Yesterday it was stating down enough where I can get it to speed much faster.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Man, are you good at launching. I've managed to dump mine upside down from about a foot high.Comment
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Lol I've had my fair share of that. I've had a lot of practice here lately so I haven't done it in a while!
I added a waterproof voltage gauge. I wired it up where it tell me a single cell voltage so I can keep tabs on my voltage after each run. Beats having to plug my checker in every time. I didn't do anything elegant with it because I'm trying to refrain from adding any additional weight. Check it .....
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Well I put the new rudder on. I waned to confirm that a little reshaping helps it. Turns out it does. It went 93.xx with the reshaped rudder and a lower pitch prop. Same prop but just a sharpened rudder and it went 91.xx. So about mph is what a little free attention to detail does. I'll be back at it Sunday. Weather is supposed to be beautiful and in the 60's.
I've got to find a way to see if the boat is going perfectly straight under full power. I'm giving no trim to the rudder so I suspect it may not be straight. My buddy is getting one of those quadcopter tgat follow you so I'll get him to bring it over and I can see for sure what it's doing. Gotta get the thing going straight. I've got a couple more agressive props to try. I know a higher pitch one it didn't like on 3s but on 4s it's a different animal. On 3s it's very tame. Even at 80+. On 4s the motor like turns into a beast and sounds totally different (but higher rpms)32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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I await Sunday evening for results Travis. Keep up the good work.Comment
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Thanks! If everything goes well I'll be posting what it did. If I have time I may try an alien esc in it to see if it's more efficient. I cleaned this thing up (ugly white wrapping with a blue heat sink...ugh) and epoxy coated it. Then put a piece of carbon cloth over the blue cooling block. Don't work the cloth isn't touching any circuits. (Think you saw pics of this already tho)?
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Have you ever tried wire drives on any of your builds yet? Maybe try it out and see if performance would be any different...
Also, have you ever tried using a thin "wedge" knife for your rudder? I hear it could help bring a few mph's...Comment
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Rudder seems to be a no go. It's a fine line of keeping it on the water. If I cut drag there it'll flip. I may need to angle the prop down a tad more.
I know I can't run a wire drive with this setup. It's got too much power and the angle on my tube is too great. Plus I don't see any wire drive collets (mbp in ose store) that fit a 8mm shaft.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Went ran it today. I didn't have much time at all to fool with it. 3s it ran ok (80.9) but seemed to be dragging and just not airing out or turning on like usual. 4s the first pass I flipped. I thought it was due to too much rudder trim so I straightened it. Flipped again. I think it was turning too much from prop torque. So I angled the prop down a few degrees. Stayed on the water next pass but was down a good bit from my best runs at 87.5mph. Was running super wet. I think since the last crash the strut moved or something. Guess I gotta start over so since I'm doing that I decided to shim the strut a little to cut the drag from rudder trim. I started at .015. Is this too much you think?
I also got agitated and cut one of the battery trays out. I evidently (knowingly and being in a hurry) I didn't mount the trays low enough to make it to where it's not a cussing ordeal to get the 4s pack out. So you know that saying.....why is there never enough time to do it right the first time, but always enough time to do it again right. Well I should post that on my cabinet in from of me. Lol.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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