Feigao 12xl

[10gauge]

Mel279, I agree with Douggie. Running 8S on a 12XL will not yield predicable success over the longterm. I don't know what your aiming for, but that's more of a SAW set up, and would not recommend using a Feigao above 35,000rpm continuously for sport oval racing. A Feigao 12XL will run predictably well with 6S @ 30,850rpm.

RMZDADDY, great run! You were smart in propping down to m440 and using a gear tranny for 8S. But, I would question running 41,100rpm continuously on a Feigao XL motor for sport ovals. It doesn't leave much room for prop changes.

[ReddyWatts]

I agree with RMZDaddy and he has all the data to prove that a 12XL will work on 8s using a trans in a cat.

I have run a 10XL on 6s with a trans and it worked great. FE did not have the larger economy motors at the time, so I was trying to get better performance out of a 540 motor.

IMO, a 12XL setup will work for fun in the right hydro hull on 8s with direct drive, but the prop rpm and weight would be the determining factors.

[Mel279]

I was thinking that if Im using 12xl with 8s lipo, and x430.5 prop...would that be ok?its a direct drive...

[ReddyWatts]

Which hull and length?

[Mel279]

Which hull and length?

Its for my Mean Machine 29", and I'll be using hydra 240 LV with lots of added caps..ehe

[ReddyWatts]

I was thinking that if Im using 12xl with 8s lipo, and x430.5 prop...would that be ok?its a direct drive...

That prop will not be large enough for the MM hull. I would not use anything smaller than an x437. The x437 on this setup in a cat hull with direct drive would use over 2000 watts, which is too much for a 540XL motor.
It would need a trans.

[Flying Scotsman]

My point on this discussion was that 8S on the motor series described is a no no, as most FE boaters now run directly from the motor to the prop. It was a cautionary note as I perceived rightly or wrongly that many new FE boaters would perceive this as a go ahead to put more voltage to their motors than they were designed for and run them for 2 minutes or more
As, I stated a transmission changes the values.
I really think we need a sticky for new FE boaters does and donts, especially for RTR boats and large hulls

Douggie

[RMZDADDY]

My point on this discussion was that 8S on the motor series described is a no no, as most FE boaters now run directly from the motor to the prop. It was a cautionary note as I perceived rightly or wrongly that many new FE boaters would perceive this as a go ahead to put more voltage to their motors than they were designed for and run them for 2 minutes or more
As, I stated a transmission changes the values.
I really think we need a sticky for new FE boaters does and donts, especially for RTR boats and large hulls

Douggie

Understood, my apologies Douggie. Sorry if I offended

[DISAR]

If your MM is set up nicely and light maybe it can do it with a 438-440 max. You can try it and tell us the results.
However,
a) the voltage is high (ESC damage potential)
b) If your MM is not set up correctly and running heavy amps draw will be high (over 100), hence motor burn hence ESC burn?

What everyone here tries to tell you is that there is a high risk of damaging motor-esc and who knows what else-flex?
It is a rare setup and "pulled" to max.You have only one positive feedback from RMZDADDY who did it but with trans.
The risk is yours, it is not something that is "impossible".

[Flying Scotsman]

Understood, my apologies Douggie. Sorry if I offended

No apologies needed, as I respected your point of view, and it was very valid

Douggie

[RMZDADDY]

Right now with the trans, I'm getting 33724 no load rpm at the prop (after the 1.22:1 reduction).

If I were to switch to a 14xl direct, that would yield 35253 no load at the prop. Does this sound more reasonable?
Sorry Mel for hijacking your thread!

Oh, and thanks Douggie.

[ReddyWatts]

Yes, the 14XL will work on 8s.

[Mel279]

Right now with the trans, I'm getting 33724 no load rpm at the prop (after the 1.22:1 reduction).

If I were to switch to a 14xl direct, that would yield 35253 no load at the prop. Does this sound more reasonable?
Sorry Mel for hijacking your thread!

Oh, and thanks Douggie.

Hey RMZDADDY

Thats ok, I needed to know as much info and opinion from all u guys here, regarding the 12xl, 8s setup, so maybe I'll be thinking also getting one 14xl, or maybe should I go for KB45 12L(1400kv) or KB45 8xl(1600kv), for 6s. Thanks to u RMZDADDY also for sharing your experience regarding your MM setup and also the video. Thanks alot for all of you guys here helping me out regarding the 12xl, 8s setup, if I go to other forums beside here and RRR, it would takes days or week to get reply, but here was pretty fast, as fast as FE boat can go..LOL

[RMZDADDY]

Glad I could be of some help, best of luck to you

[Mel279]

What flex cable size do u use on your MM?Im using .150 flex