Littlescreamers 63mmwater jacketed Motor

[Xfactor]

Thanks. I made it out of some aluminum bar and L stock. I plan to draw it on on inventor and make it a solid one piece item.You cant see it in the picture but it is rubber isolated as well.I It was pretty straight foward though. Its tight to get the batteries in the cockpit but its do-able. Im truly stumpped about props\s lipopacks combos.For now i will try an x457 and a x460 on 10s and 12s lipo . After looking at some of the 7th scale footage im thinking 8s and a real healthy prop the problem is you need a beefy esc something that can do 200 amps continuous. Im working on such an item as we speak.

[Xfactor]

Hey guys do you think the screamer could stand 200 plus amps @ 8s lipo?

[Xfactor]

Guess this tread is dead. No support for this motor. Oh well.

[MarkF]

Since only a few people have run this motor and with no eagle tree equipment maybe you could tell us if it can handle 200 amps. My guess is I'm sure it can but like any motor we run it will only do it for so long before it gets too hot. Let us know how it works out .

Mark

[Xfactor]

Im scared Mark . I dont want to burn it up .You dont think the idea of running 8 s is any good?When you said anything above a 460 just drags it down do you think thats a result of the esc running at its limits or something else?

[m4a1usr]

Hey guys do you think the screamer could stand 200 plus amps @ 8s lipo?

Thats a pretty good question. If your talking 200 amps continous then my personal experience says no way. 200 amps at 30 volts is lower then the 8000 watts the motor is rated at but that much current is going to equate to very large amounts of heat. Things are going to get hot other then the motor too. Internal-external wiring/ connectors/ solder joints. Look for the weakest components/ parts in the circuit. Thats probably where failure is going to occur. I dont have any facts to back it up, just my gut intuition, but I think your going to have some serious issues.

John

[Xfactor]

I fired this thing up on 12s today. MAN forget about it! This thing has sooooo much freakin torque its rediculous. It had my boat torque rocking on the stand. Man this thing may as well be on the end on a chain saw. Goodness gracious.

[Xfactor]

Yeah ur probably right i just think im gonna have to pull more than 80 or so amps to get this thing rockin.

[Xfactor]

what do you think is safe. I mean you got some of the guys on here pulling 140amps on 580's

[m4a1usr]

what do you think is safe. I mean you got some of the guys on here pulling 140amps on 580's

I dont have one in front of me or even seen one in person. But to me when considering high amperage setups I look for the choke points or areas in the circuit where all those amps have to pass. The motor internals of the LittleScreamer are a mystery to me. I have seen the "guts" of a Scorpian. And big brushless inrunners like Neu's and Lehners. What bugs me about outrunners (and not all of them but some) is that the wires coming out of the case are not the original windings strands like inrunners. Those leads coming out of the case are crimped inside the motor on some motors. A junction point. My concern is how well they all conduct equally. You may have nothing to worry about. But I would certainly do the checks just to see.

Mark is more qualified to state a rating as he already has some experience running the motor in one of his hydros.

John

[Xfactor]

So with the right set up theres a motor that could do such a thing?

[questtek]

Thats a pretty good question. If your talking 200 amps continous then my personal experience says no way. 200 amps at 30 volts is lower then the 8000 watts the motor is rated at but that much current is going to equate to very large amounts of heat. Things are going to get hot other then the motor too. Internal-external wiring/ connectors/ solder joints. Look for the weakest components/ parts in the circuit. Thats probably where failure is going to occur. I dont have any facts to back it up, just my gut intuition, but I think your going to have some serious issues.

John

Turnigy has a giant inrunner that is about the same watt power, around 8,000. I have run considerable bench tests on this motor. I was using 5,000 A-hr LiPo pacs (new) rated at 45 C. I also used the Turnigy 200A HS controller recommended for this giant brushless. The problem was the draw was so heavy on the motor the voltage dropped significantely in a very short time. I wanted to measure thrust so I had a giant 27" carbon fiber prop on it. The max I could get out was around 4 HP or so. I even added way more pacs to compensate for the voltage drop but even that did not help much.

I talked to Mark this morning and am going to borrow his Lil Screamers to put into a giant Aeromarine Laminated yellow Cannard that Remy built for me. I have included a picture of the boat along with the dual rudder/0.250" drive for it. I have all the Eagle Tree Equipment so will install it to see what happens. My guess is that the RPM is going to be too low to really have any significant speed. My previous experiments with Scorpion Inrunners in Mean Machines was pretty much a failure for the same reason.....not enough RPM even though I used some giant props.

But, after all, we only learn from failures.........and I am becoming really smart these days!

[m4a1usr]

So with the right set up theres a motor that could do such a thing?

Absolutely. The big Lehner HiAmp versions can do 200 amps continous. I know Steve Neu has done some custom winds motors for 200 plus amps. But in almost any RC boat, the better method is to use more volts and less amps if maximum speed is your goal. Heat is our adversary. Heat is what you get with the requirement of max power but voltage limits.

I'm still surprised not to see spin offs of the big high voltage motors that are being used in commercial or military applications. Of course most of those motors are custom as are the controllers but there are many big and I mean big (25 kw and more) battery powered vehicles from aerial platforms to ROV's. I guess what it all come down to is the cost. Throw enough money at it and they can build you bridge to the moon right?


John

[sailr]

I have no idea about the motor. I was supposed to be sent one two months ago but never did get it. Not sure what's up with that. I run with some pretty hot dog FE guys and wanted to show the motor's capabilities in a 48" mono. Oh well. Here sits the mono I bought for it!

[RandyatBBY]

Guess this tread is dead. No support for this motor. Oh well.

Do you not think that when they have the new supply of motors in from China, Scott will be hot on the thread!

Sailr I talked with Scott for about 45Minutes a few different times and he was going to send me some sample motors for me to help him develop a line. Another time he assured me he was going to send me a custom motor for the SAW's. I never got a thing, Sorry Scott you are a little flakey in my opinion. I hope you made a lot of money off your 50 motors...... I for one feel a little burnt. Not much, but you should call some one when you change your mind.