are 20turn stingers enough for a 40" proboat PT?

[spacephrawg]

My stock motors burned out not too long ago due to battery troubles. had to replace hte motors and ESC. So i replaced them with 20turn stingers, based on someone's advice. Everything is watercooled. What I'm trying to figure out is will those motors be able to handle their job or will they overheat and die?

Thanks!

[Predreadnut]

I am not a big lover of the Stingers. I have a Proboat Classic Runabout and when the stock motor burned up I tried a Stinger. It didnt make as much power as the stock motor and it got very hot. After leaving a very small amount of water in the hull a few times, the Stinger corroded really bad. This is when I tried what turned out to be my favorite motor. A Traxxas Titan Marine 14.4v. This motor is cheap(around$19.00), reliable,has GREAT power,and has a built in cooling fan. Running my runabout on 7.2v, the Titan never has gotten more than warm. What I find amazing is the amount of power it produces on half its rated voltage.

[spacephrawg]

Thanks man. Well this sucks because somehow I ended up with 6 stingers.

So you ran a 14.4v motor on a 7.2v battery and it was a-ok? eeeenteresting. Thats the kind of battery size I've got.

[Predreadnut]

Try the Stingers, you've got water cooling right? I dont have water cooling so the internal fan on the Titan works well for me. Running the 14.4v on 7.2v is one of the reasons why it runs so cool, even running flat out, Im only running the Titan at 50% of its max. Try the Stingers, see what happens, experimenting is half the fun. Make sure your water cooling is working good and dont leave water in the hull and I think they'll work fine.

[Kmot]

I also did like Tim, with my Kyosho Stream Liner. I ran an E-Maxx 14.4V Titan motor on a 7.2V battery. It ran perfectly scale speeds, the motor never got hot, and it was in a fully enclosed hull with no air vents or water cooling.

Your Stinger motors are good motors. The secret is to not overheat them. Just like using them in a car, they have to be 'geared' correctly. You will melt a Stinger in a car just as easily a boat if you overload it. Same goes for any motor, actually.

The 'gearing' on a boat is simply the prop. Too large, or too much pitch, and it will overload the motor. Since you have water cooling, you have a slight advantage. Although honestly, a coil around the motor is not all that great for cooling. Brush cooling accomplishes far more. Anyway, you may need to get different props than the stock Proboat versions. It requires testing and more testing. Set up the boat, and run it in the water. Bring it back into dock no more than at 1 minute intervals checking for heat. If you can do the "5 second" test each time, then you are good. If you cannot hold your fingers to the motor for more than 5 seconds it is overheated. Try a smaller or less pitch prop.

[spacephrawg]

I'm using a three-blade Raboesch propellor that was recommended to me by Loyalhanna.

The brushes on the Stinger aren't exposed so cooling them is a problem.

Perhaps I should jsut go and get more of the Proboat stock motors? I liked mine until they burned out. I destroyed them by running one with a load and one not, for an extended period of time. Fried everything.

THe motors worked well when they were "alive" though.

[Kmot]

I'm using a three-blade Raboesch propellor that was recommended to me by Loyalhanna.

Recommended for the Stinger in the Proboat PT??

The brushes on the Stinger aren't exposed so cooling them is a problem.


Not really. Look at the photos. This is how can motors are done for brush cooling, you solder short pieces of tube to the brush tabs:

[spacephrawg]

The props i'm using were recommended for the stock proboat motors, not the stingers.

[Kmot]

That's why you will probably have to experiment with different props. ;)

[spacephrawg]

So which is nobler in the mind, or boat for that matter? The traxxas E-max motors or the stock proboat motors?

[Predreadnut]

The stock motor in my Proboat Runabout lasted about 10 hrs. I would waste money on them. Just my opinion, but I'd get the Titan's, save yourself time,trouble and worry.

[spacephrawg]

Hm. The PT boat stock motors are different than the runabout motors. They're even listed under a different number I think.

So what do I do with six unused Stingers?

[CaptLee]

Put a pair of the Titan's in my Midwest PT and am running them on 14.4 volts with Propshop 1.2" 3 blade props. Almost too fast, but it is easier to dial it back than to go to 8 cells. Motors run cool(5 second test) so ended up using one in my Classic also and got similar results as Predreadnaut on 7,2 volts. Figure that the Titan is usable in any boat that needs a fair turn of speed and reliable as rocks. No water cooling on them so one less item to worry about.

[spacephrawg]

Put a pair of the Titan's in my Midwest PT and am running them on 14.4 volts with Propshop 1.2" 3 blade props. Almost too fast, but it is easier to dial it back than to go to 8 cells. Motors run cool(5 second test) so ended up using one in my Classic also and got similar results as Predreadnaut on 7,2 volts. Figure that the Titan is usable in any boat that needs a fair turn of speed and reliable as rocks. No water cooling on them so one less item to worry about.

What sort of run time do you get with them? All I've got for batteries is 7.2v 6 cells.

Also this is the titan 550's we're talking about right? 12turn right? I'm looking them up on ebay as we speak.

Thanks again!

[spacephrawg]

The stock motor in my Proboat Runabout lasted about 10 hrs. I would waste money on them. Just my opinion, but I'd get the Titan's, save yourself time,trouble and worry.


When the stock motors quit, did they destroy the ESC too?

[fooman2008]

I would think that titans would be fairly cheap since seemingly everyone and their brother is upgrading their E-MAXXs to brushless. I would probably take trip to fleabay and see what they have. Since my E is sitting there gathering dust it may donate some components to future projects. (I have the a pair of the old stepped speed controllers, and at least four servos of various gear types (plastic and metal) so I got something at least!)
Foo

[CaptLee]

Not the 12 turn ones, the 19 turn or the 23 turn for the truck. Titan Marine is an unknown for turns but appears to be a med. power motor.

[spacephrawg]

the titans i've seen on ebay are reasonably priced as motors go.

Ironically, an old order i had for the stock Proboat PT motors just came in. To those who have experience with these, how long should i expect them to last b4 they crap out on me and will they take the ESC with them?

Also will I need a new ESC for the titan motors? I hope not.