Littlescreamers 63mmwater jacketed Motor

[bvincent]

We are goofing around with a 45" Cat with this on 12 cells, and I can tell you that when you hit the throttle this thing just leaps forward and blasts off! We haven't let it "run" yet and it's over 70mph easily. A bit more trimming and we will let it really run! Just need to be sure it won't blow over.

[Xfactor]

Randy that was just the weight the Dumas circus came out to be. I didnt do anything in particular to make it heavy. The plywood and mahoghany are just heavy.The motor and batteries wont take me over 16 pounds; If they do not much more.Randy are you considering "empty" with all the running hardware installed?That is what i meant by empty. All the hardware installed : Rudder,drive shaft, strut,turnfin,and radio gear just no motor, batteries, or speed control.What do you recomend Mr. Joye or Randy.I ask one of you because I know your experience with 1\8th scales is more than mine. If I just want a fast toy you guys still dont think the screamer is a true option for me?Price is always an issue.Ill never need 8000 watts but isnt headroom ok? My way of thinking says that i can run the scorpion at almost the max continuous amperage or I can run a screamer and barely push it to get what I want. I still need you guys expert advice.I want to get my motor ordered by Friday so please help me out.

[MarkF]

I just ran this motor again in my speedfreek sport hydro this time. 10s 2p 10000 mah thunder power 30c cells, 460 prop and a castle HV240. This boat is a true gas hydro and weighs in around 20+ lbs RTR. I would say the boat runs in the high 50s. After my run the bats and controller were only warm and the motor was hot but not overly. This motor is not what you guys think it is. I would say it has the power of a Neu 2215 but with 100 rpm less KV. They need to up the KV and maybe the pole count if they want to compete against the Neu or a gas motor. The gas sport boats as my 10s neu 2230 powered ones are doing 70+ mph. I can push 80 mph on 12s. I still think this is a great motor for the price and I hope they can work out any changes they can do to make it even better. By the way propper chopper was at the lake today and got some video of my boat so you guys can see what it looks like when he post it. I think it looks good for a sport set up.
Bob, Radek has contacted me to help him with his testing since I am local to him. I will let you guys know how that goes as well.
Mark

[bvincent]

Well funny you mention pole counts. We are making the newer version in 8 poles and 770 Kv We won't have these for a month or maybe more, but we are listening and learning from you guys

[bvincent]

Mark, I want to be there when you guys hook up. Please let me know. Rad will tell me too, but I for sure want to be there.

[MarkF]

Sounds good Bob, I have lots of props to try ( over 50 ) I told Radek too to let me know when he's ready to actually run the boat before I come over. I will bring some of my boats as well.

Mark

[m4a1usr]

By the way propper chopper was at the lake today and got some video of my boat so you guys can see what it looks like when he post it. I think it looks good for a sport set up.

Right on Mark. You tell Tony to get the Youtube loaded. I want to see!


John

[Xfactor]

How many poles is the motor? When I asked I couldnt get any answers.An increase in poles will also change the timing requirements. I said that cause u guys had an ealier dicussion about casltle speed controls and their compatibility with these motors. Note: firmware updates dont fix everything thats wrong with a speed control or any microcontroller based device if it doesnt already have the hardware to suport the changes. The timing of any motor of this type can be easily calculated as long as you know the number of stator arms and poles.Ill be glad when all these people design speed controls that go with their specific motors and someone needs to design a closed loop setup on one of these sensorless bldc motors to impliment torque lock or some type of anti cavitation. that would help deal with the amp spikes these motors and esc's take. Id love to see a scope trace of one of these electric boats as they run bouncing all over the place. Motor sees a load then it dont sees a load then it dont.Imagine the function of the graph if anyone knows what im talking about.Also I notice every one just punches their boats out from a standstill it looks cool but thats the surge that kills the speed controls . I imagine a cavitating prop catching water at 20 grand probably give you a nice amp spike too ya think? Also try not to make your speed transitions so sudden on the water. Be gradual with the throttles.Thought on the castles if the castles power blocks are purely n-fets then they have a floating supply thats what the caps on board are for(likely).If that speed control was designed around a specific rpm range the R/C (resistive capacitive) circuit has to be calculated and the caps have to be selected to ramp up and discharge fast enough to accomodate the pole changes as the motor turns and the fets need to drive the waveforms from positive to negative.Most of the big stuff is likely this way because their is less high amperage selection amongst p-fets than n-fets . So castle is who you need to ask if the screamer will work right with their esc. Scott you guys need to know the appropriate timing for your motor. As for the chinese stuff its not the manufacturer its the desingner so a speed control from there has just a much likelyhood to be good or junk as the expensive stuff. For a true boat motor and speed control to be good they need to be designed specifically for that purpose. Please dont confuse the caps im talking about with the external caps that everyone is adding those are merely stiffning the voltage supply line. Nuff said
X

[bvincent]

X Factor,
You are wrong I did post all that info when you asked. This thread just moved a couple pages and you missed it. I said it has 6 magnet poles and 9 stator heads. The new version will be 8 magnet poles and 12 stator heads.

[Xfactor]

Im sorry my friend I didnt see it. I wasnt slighting yall my friends i was only trying to help.

[bvincent]

No Worries, I just didn't want you to think your request was ignored or forgotten

[Xfactor]

The castles should hopefully be able to handle that new setup its 15 degree timing on that dont quote me cuz im remembering that from my head. Ill let you know for sure I have to draw a diagram so make sure im write. But Mark is correct more poles will give u a "torquier" motor excuse my bad english.I think you guys understand that there is a great need for a motor of this type and price to run scale boats. While everyone including myself is telling the guys at screamer what they need id like to offer any help I can give just pm me. Properly designing a motor for a specific application is a daunting task.Esc are just as bad. I hope the processor in those casltes arent the problem because processing speed limits the maximum rpm a speed control can drive a motor as well. Slow processors could cause timing issues and cog a motor or have fets shorting across one another.

[Xfactor]

If you want to put some easy money in your r and d dept. Design us some of those trick watercool jackets for other outrunners . You feel me? Thats where ya cash is. Do this before you become a victim of team zerox lol. Patent your water collar if you can.

[Brushless55]

Well funny you mention pole counts. We are making the newer version in 8 poles and 770 Kv We won't have these for a month or maybe more, but we are listening and learning from you guys

sounds great man!

[Ub Hauled]

I'd be down for one of those 8 pole 770Kv motors... looking forward to it.