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Still learning fellas. I have a 34 inch cat with a single leopard motor - 1500kv 4082. I have a 180amp esc and it runs about 55mph on 6s (two 3s in series). Im dying to run the boat 8s. Is that too much?
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I wouldn't run 8s unless your budget allows for buying new parts.Steven Vaccaro
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Not to mention the flex cable, if its .150, that will also be stressed.Steven Vaccaro
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That's not true.....
The motor is actually rated at a wattage, not an amperage. The wattage is a direct relation of voltage and current. This motor is rated at 3500watts. At 6s, that's a potential draw of 158A. Running the same load at 8s, the potential draw is reduced to 118A.
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It IS true, the motor is limited to 120 amps on 8S as you demonstrated. You are giving poor advice to the OP. If the OP is using all 3500 watts of the motor on 6S now, he will not go faster running 8S at the same wattage. To go faster he'll need more amps. The motor might take it with shorter run times, or it may not. Running inappropriate motors is one of the major causes of motor, cell and ESC failure.That's not true.....The motor is actually rated at a wattage, not an amperage. The wattage is a direct relation of voltage and current.
Running a sport motor at near 40,000 rpm is asking for trouble anyway. Some of us can do it - within limits - but it is for specialized use only. So far it's four experienced boaters against 8S, one in favor. I won't like those odds.
If the OP wants to go faster, he'd be better advised to change his prop or strut adjustment. Many of us run 60+ mph with similar cats on 6S without stressing the motor, cells or ESC.
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What are you trying to say here? I'm saying 1500kv on 8s with a normal prop (let's say 45mm) will draw well over 200A, actually closer to 300A. Whether you think the motor can handle 120A or 118A is irrelevant. Its too high of a load for both the motor and esc, period. And it surely won't be "running the same load" on 8s that it sees on 6s.
Like anything, It could work for a while. Like Steve said, if you are ok with accepting parts failure that's fine. If you're looking to put something together to be reliable, 1500kv on 8s most likely isn't it. I say most likely, because it is possible you could get current draw down with a tiny prop (under 35mm), but I don't see the point.
Running this motor on 8s with a prop that people would normally run would be setting yourself up for failure.Comment
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hmmm, guess I'm completely wrong then. I'll be happy to admit it. That's why there's people on here who are always happy to prove someone wrong, and that's what makes this forum so good.
Fluid, you say to go faster he'll need more amps. But he's going from a 6s setup to an 8s setup, wouldn't the increase in RPM increase the speed?Comment
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The thing is that if you increase RPM on the same prop you will most definitely get more amp draw. If you go from 6s to 8s you have to drop the prop size (or pitch) to keep the amp draw the same.
If the smaller prop at a higher RPM be any faster is hard to say without testing.
IMO, not worth it though unless you're shooting for a record. I would play with the setup and prop to get more speed out of it.Light travels faster than sound, so people may appear to be bright until you hear them speak.Comment
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Guys
I would still steer away from running high RPMs on the Leopards. Yes,.......some are doing it. Thats not the point. I agree 100% with what Jay states. I saw a post from Sailr (Jim) where he comments on blowing up 2 5692 motors and oddly enough his comments mentioned the rotors failing and one taking out his HV Castle controller. I cant find the thread (I thought it was under the Castle HV Controller thread?)
Maybe someone remembers it? Anyways, as I hear about Leopards failing I am leaning more to the cautious side. Just wanted to bring up this point to OSE members.
JohnChange is the one ConstantComment
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Thanks for the feedback...
So what are these guys doing in these Genesis cats blazing over 60 70 and 80mph? One guy was running 9s on a 4082 leopard. What can I do. I have a 34 inch Bud Select (china special), current setup 6s on my 1500kv 4082 Leopard, 180amp turnigy esc. Higher KV motor and stay 6s? Upgrade motor and go 8s? Upgrade esc? Both? Somebody help me go 70. I'm at 55 and my esc and motor are barely luke warm after a full batter run...Comment
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My 37" Drifter cat ran with the same combo using an x445 and was running 62mph. I don't remember temps, but I remember having room to prop up. I'm confident it had the capability to run 65mph reliably. I'd run what you have and tune with props and strut settings.Comment
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Thanks. I'm going to stick with 6s for now.
I am going to try to prop up. Is that a 2 or 3 blade prop? Last question for all of you guys, if Im running 6s, do I have to use bullet plugs? My life would be easier if I could use Traxxas plugs on my boat. My other boats and my RC trucks are using 3s or 4s lipos but all are on Traxxas plugs. Some say those are fine, and some say they can't handle the amps. Help me pros...Comment
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This is a good wrap up.
"Running a sport motor at near 40,000 rpm is asking for trouble anyway. Some of us can do it - within limits - but it is for specialized use only."
Sure you can push the parts harder, but remember, at some point they push back. Since you stated you have 3s and 4s packs, I would suggest trying 7s first. If you have two packs with the say specs.
Also don't believe all the stuff on youtube.Steven Vaccaro
Where Racing on a Budget is a Reality!Comment
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