P-Limited Motors - Im going to jump on the hot seat.

[Steven Vaccaro]

Please give me the pros and cons of a rule similar to this.

A max kv and max weight on a motor. Local clubs races would be able to self regulate and when it comes to bigger events, a kv checker and scale would be used.

[Darin Jordan]

For the sake of discussion, here is a staring point for a motor specification:

Specs:
Can Measures: 36mm diameter x 58mm long (perhaps allow to 60mm, which seems to be a standard)
Poles: 4 pole (perhaps allow 4 OR 6 Pole)
Weight: 252 Grams (That's without water jacket. Perhaps allow up to 260 Grams)
Max KV: 2050

Perhaps people would be willing start gathering a list of motors to post in this thread that are close to these specs, and those motors could then be discussed and compared.

A prudent way to manage the class would be to get an initial list of motors together and make them official... re: part of the rulebook. Pretty much how we have P-LTD now.

Then, perhaps before each season or National event or ???, any new motors that come up could be considered, discussed, voted on, and added to the list... Should be pretty cut and dried if the specs are setup correctly, and shouldn't require too much controversy.

I think the level of power we've been running is great and provides a very nice level of competitiveness and excitement, so pushing that bigger doesn't make a lot of sense. We have the "Open" motor classes if you need a new thrill.

I think I just got myself involved deeper than I should have, but with our club hosting the Nats in 2016, I think someone from our club needs to be concerned about this. I'll start the ball rolling.

Ready, Set, GO!

[RandyatBBY]

I am really interested in finding a real cheap end result but it is tough. Dougs P's TP 1950Kv motor is one I would like to see added. I will add more as I find them. thanks guys.

[Doby]

Well, as the current batch of AQ (gold and blue) and older Proboat motors (blue and grey?) would be obviously grandfathered in, the first one that comes to mind obviously would be the (sorry Darrin) TP motor the cheese-heads have been using. Test results from a few people, myself included would seem to indicate that it is pretty close in all aspects.

By the way Darin, when did you start working for Target?

[Darin Jordan]

the first one that comes to mind obviously would be the (sorry Darrin) TP motor the cheese-heads have been using.

Hence, the suggested starting point specs...

[photohoward1]

P-Limited Motors - Im going to jump on the hot seat.

you know you could throw away all the motors if you would just spec max RPM/v say 2200 and spec a prop. Like. a 445 or M445. Use any motor you want. Why would a NEU or Lehner or any other cheaper brand be any different with a max KV? Argument solved.


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[RandyatBBY]

Howard this/your idea is a little too radical. but it would get a motor like this one if the length was expanded a little.
http://www.hobbyking.com/hobbyking/s..._Inrunner.html
and real cheap at $32.00

[ray schrauwen]

Since we are going down the HK road. I like this: http://www.hobbyking.com/hobbyking/s...90mm_EDF_.html

It has skewed windings similar to a NEU or HET. Very smooth 4 pole motor. I have one and I should give it a go. People have pushed it on 6s and find it's pretty tough.

[Darin Jordan]

Since we are going down the HK road. I like this: http://www.hobbyking.com/hobbyking/s...90mm_EDF_.html

It has skewed windings similar to a NEU or HET. Very smooth 4 pole motor. I have one and I should give it a go. People have pushed it on 6s and find it's pretty tough.

That definitely physically fits within the specs above.

Turnigy SK3 Fandrive - 3659-1900kv
Kv(rpm/v) 1900
Weight (g) 249
Length B (mm) 60
Diameter C (mm) 36
Can Length (mm) 35

[Darin Jordan]

Howard this/your idea is a little too radical. but it would get a motor like this one if the length was expanded a little.
http://www.hobbyking.com/hobbyking/s..._Inrunner.html
and real cheap at $32.00

For reference in this discussion, here are the motor specs for Randy's suggestion:


Turnigy XK-3665 2100KV Brushless Inrunner

Kv(rpm/v) 2100
Weight (g) 275
Length B (mm) 65
Diameter C (mm) 36
Can Length (mm) 60

[RaceMechaniX]

This is going to be a touchy subject. The biggest problem I see is no matter which motor you stick in the boat we are all going to push the motors to the limit and eventually to failure. In the non-limited classes you can go as wild as the hardware available will allow. The racer will find the best compromise between power, hull weight, set-up, prop, etc to make a combo work. I don't think anyone complains about someone having an unfair advantage in the non-limited classes.

I think we can all agree the motor is the limiting factor in the ltd classes. I would prefer to see current limiters used in line, say 75A and any motor/ESC combo allowed. This greatly reduces failures while allowing freedom to use different motors. I know this topic has been discussed at length previously.

TG

[photohoward1]

Why Not a 1521 Neu/ its only 1860kv.... With a 445 you would never blow it up. Save you the cost of 3 AQ2030 Motors.
Wouldn't be my choice to Heavy. My choice would be.1515/1y....Never blow that up either with a 445...
A Leopard 4072/2200 or a Leopard 4082/2200...Would save tons of money over time. I know TP and Many others make 2200 and below KV Motors. Heck why not a Lehner 1950/6 or 7....Big Money but would last FOREVER!

I got out of the Spec game because it was costing a fortune in Bad Motors.....******Spec The Prop!*****

[photohoward1]

This is going to be a touchy subject. The biggest problem I see is no matter which motor you stick in the boat we are all going to push the motors to the limit and eventually to failure. In the non-limited classes you can go as wild as the hardware available will allow. The racer will find the best compromise between power, hull weight, set-up, prop, etc to make a combo work. I don't think anyone complains about someone having an unfair advantage in the non-limited classes.

I think we can all agree the motor is the limiting factor in the ltd classes. I would prefer to see current limiters used in line, say 75A and any motor/ESC combo allowed. This greatly reduces failures while allowing freedom to use different motors. I know this topic has been discussed at length previously.

TG

No Motor failures if you limit the prop!

[RaceMechaniX]

Howard,
Would you propose a specific spec prop like the 445 or any 45mm prop?

TG

[photohoward1]

Easy to check too: All you need is a Tachometer. Any More than 30K at the prop on dry land and it is disqualified. (I am not sure what voltage to use for a charged 4s pack)