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Hey Travis, I know your anxious to run the boat but you've taken it this far and I would hate for anything to go wrong rushing and trying to fit some runtime in.
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I guess I'm just having some bad luck. Neu 2 day shipped me the correct bearing (awesome of them btw)....so I put my motor back together tonight. Sounded unusually rough. So I hooked up my 1527 to compare the noise. The 1527 was much quieter. Investigation time. Long story short, the bearing they sent me today is bad lol. Crunchy and rough. Guess that explains it. Good thing I had already ordered a set of boca ceramics. I guess I'm not worried about it, can't run till the weekend anyway.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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First try. On 3s.
First pass on 4s. I know this was a while back this was posted but I never tried the low voltage route till now. So I really had no retort. Lol. Was going through some old threads....and I stand by my comment of it not being hard to get 70 on 4s.....when I finally got around to trying it. :)
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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With all the issues you've been having with Neu... I'm surprised you still have any patience left with them.Comment
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Originally posted by dmitry100
Well I haven't had any failures. Matter of fact I've pushed my neu's harder than the lehners I had. The lehners failed. At least any error I've had with neu, they took care of it and always sent me extra parts for free with it (end caps, bearings, shims, rubber boots). I have nothing bad to say about neu. It's not just neu that makes mistakes. Tp sent a customer of mine the wrong kv (it was double the kv he ordered) motor and burned his esc up and destroyed one of the batteries. They more than took care of him. So I'll continue to use tp and neu in all my builds. I'll just make a habit of checking kv for now on.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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It's funny, this discussion swayed me to build this last fall...
It was my first single motor build so dialing it in was new to me. Didn't have much time with it last fall and this spring only had a couple runs with it before the trials. Testing this spring on 3s I had it in the upper 60's on the gps, tapped to the deck, and topped out at about 82 on 4s. I only had 3 props to try on this boat and it didn't like two of them lol.
My logs showed I had a LOT of room to play with props. I had a bad crash in the spring and cracked her up good, it's always that one bad hit. I repaired her and she took the record with a fast pass of 79.5 . No doubt she had a lot more left in her, sure she would of knocked on 90 np. I took it to Alabama with me but was having radio issues all day and didn't get to run it. Have all the parts here to build my new P-cat just need my hull, not going with a river this time.
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It's funny, this discussion swayed me to build this last fall...
It was my first single motor build so dialing it in was new to me. Didn't have much time with it last fall and this spring only had a couple runs with it before the trials. Testing this spring on 3s I had it in the upper 60's on the gps, tapped to the deck, and topped out at about 82 on 4s. I only had 3 props to try on this boat and it didn't like two of them lol.
My logs showed I had a LOT of room to play with props. I had a bad crash in the spring and cracked her up good, it's always that one bad hit. I repaired her and she took the record with a fast pass of 79.5 . No doubt she had a lot more left in her, sure she would of knocked on 90 np. I took it to Alabama with me but was having radio issues all day and didn't get to run it. Have all the parts here to build my new P-cat just need my hull, not going with a river this time.
https://youtu.be/-xAAKyf2P1A
Looks like it's running pretty smooth! That's the first time I saw that video. Good stuff. I only have two props for it right now too. Well I tried a three blade but it lost 8mph. Maybe some tweaking it would have gone faster but I didn't like the amp draw. Right now I'll spike around 260 for a tenth or so of a second and then it comes down to high 100's low 200's so I've got some room to play. I propped down to a 1.4 pitch prop to run it that first time on 4s. It's no doubt got 90+ in it easy. Haven't cut the rudder or used a thinner one yet. My batts are less than ideal too. I'm only running 6200mah total on board. This was honestly an experiment to see how it would do so I didn't buy anything special for it. The tiny 3100mah batts are for my little play boat. I just wanted to do something a little different than the norm and see where it would end up. Guess a new challenge. Anyone can keep throwing more and more voltage at something and keep going faster till something lets go...but it's truly a challenge to do the same thing with less power.....so my hats off to the guys that are doing this. I came across this thread the other day because someone pmed me about some Rivercat build threads and I clicked on this one and started reading it all over again. I was getting a kick out of some of my shenanigans in here. Lol. Then I came across that post and made me think of where I'm at and what I'm doing now. I probably wouldn't even be messing with trying to go fast on 4s had neu not sent me the incorrect kv and it making me curious to see what it'll do. I didn't care about the esc anyway as it was a Frankenstein experiment anyway. Guess it's being put to the test lol. I'm surprised it went this fast, I tried this motor on 4s in my 1/8 buggy and it was laughably slow.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Not sure why you guys don't go with twins... 100mph is rather easy to acheive. Yet 80-90 mph takes lots of work with huge Neu's....
kfxguy: What do you think you did wrong in terms of what made those Lehners fail? Maybe too big props in terms of diameter (more pitch, less diameter), etc? Did it end up burning the windings, or did rotor get destroyed?Comment
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I didn't do anything different with the lehner that I've done with neu. Just don't trust them anymore. Plain and simple. The rotor shaft came out of one. The other one, I'm not sure, the kv shifted (maybe internal short) and went way higher and blew up an mgm esc. I ran a 648 prop on it for a little bit and then went to a 447 prop. Temps never even got warm. (Good luck getting a lehner warrantied. They will offer to look at it, but it actually making it to them is the fun part. Mine sat in customs for a month or so and then got sent back. I gave up. $480 paper weight. I'd rather buy two neu motors or 4 tp motors. A lehner isn't like some magical motor or something. It might be a couple mph faster than a comparable other name motor but it's not like omg faster. Or even $480 faster. I wanted to see what the hype was about. I did. And it's no big deal unless your trying to get that last one or two mph.
To answer your question about the twins. First off in p cat you can only run a single motor. So twins are out anyway. Second, what fun is it to not have a challenge? Sure, build a twin, go 100. Just like everyone else. Is that impressive to be like everyone else? Not in my opinion. It more impressive to know you ran the number with half the equipment. Like my buddy's Genesis. Went 104 with a single tp motor. No special prop. Nothing. Just a simple combo I put together for him with a $100 motor. That's impressive to me. :)32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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"P" class in IMPBA is single motor only. NAMBA allows 2 motors in P-Q-S-T. It would be nice if they had records for both single and dual motor classes. The SAW record for P in NAMBA is 102.88 which would be a real challenge with a single. Shawn's certificate proves a real accomplishment and I believe 80's are on the horizon. We never came too close to our GPS readings when we ran 330' and timing lights down and into the wind for an average. I have seen a boat pick up 6-7mph as its coming off the water on a radar gun. Your GPS will give you a peak speed somewhere in your run. Nice to know info but not truly accurate.
Mic Halbrehder
Mic Halbrehder
IMPBA 8656
NAMBA 1414Comment
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duplicate sorry
Mic Halbrehder
IMPBA 8656
NAMBA 1414Comment
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I disagree. It is accurate. It's been proven many times. Gps is accurate. Just because you run 90 on the gps and 85 through the traps does not mean the God is not accurate. It means you didn't get a straight enough run or a good enough start. What the gps reads is how fast the boat is going at that point in time it's updated. My gps updates every one second. See really the timing lights isn't the accurate culprit. Why? Because your boat might be capable of going xx mph but going through the traps calculates the distance traveled and the time it took to cover that distance. If your going 50 when you break the beam and end up at a true 90mph when you break the other beam it's not going to read 90 even tho you TRULY did 90. How in the heck is that more accurate that something that tells your true absolute speed? It's not. Argue if you like but it's not a true representation of how fast a boat is all out top speed. It's a representation of acceleration, keeping it on the water from accelerating quickly and being able to make the straightest (read:shortest is fastest) pass you can make. So really if you start off 40ft from the center line of the beams then go diagonal to 20ft on the other side of the beams (extreme example I know but getting my point across) then you lengthen your distance you have to travel effectively lowering your speed. So even tho your boat did 90, it reads lower at 80 so you just think that measurement is an end all and your boat only goes 80 because you can't get a straight enough line? Foolish thinking in my opinion. I use a gps as a tuning tool. I feel confident pretty must every fast saw racer uses one as a tuning aid too. I squeeze out what I can by tuning and prop changes with the gps, the eyes and ears are possibly accurate (I've guessed within a mph or so my speeds many times) but I feel the gps is more accurate. Maybe some people can tune their setup by looking at it and just knowing, but me, I feel better knowing for sure. Now at an event, it's up to me to put the boat straight through the traps and be at the highest speed I can be at when I break the beams. That's driver skill, just because one may not have the skill to do it up and back and keep it straight doesn't mean the boat don't run the number. That's unfair to take that away from the boat if you ask me.
I've tested my gps every which way I could. I tested three at a time. They all read the same. I tested it in my brand new 2016 model car. Read the same. I tested it against a radar gun. Read the same. I'm not sure how much more accurate you can get?32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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kfxguy: With the Neu and LMT... Were you running similar RPM unloaded and similar props? My LMT 2250 spins around 63k unloaded.
When both LMT's failed on you... did it happen right after a flip / air time?Last edited by dmitry100; 12-29-2015, 01:47 PM.Comment
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