Few Questions.

[airbiscuit]

1) If I were to run my pursuit with 4s (1 pack) on M445 prop with the T180a, which motor will be best & why?

Leopard 3660 2050kv or Leopard 4074 2150kv?

2) I am running the 4074 2150kv, M445 , T180a on my Pursuit right now. The ESC will cutoff every time I run full throttle. As soon I release the throttle then its back to normal again & will do the same thing again if I go full throttle again.

I am runing 4s1p 45c 5000 mah.
LCV set to 3.2v (IIRC)
Timing set to 3*
ESC & motor got their own cooling lines.

[oscarel]

You need to run 2 packs with either motor. You're tripping lvc.

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[airbiscuit]

You need to run 2 packs with either motor. You're tripping lvc.

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I guess that is for the 2nd question. So running a single pack lipo is not meant for my setup. Guess the current draw is that much.

[NativePaul]

1, depends on what you want from your boat, the smaller motor will offer more runtime, and the larger motor a higher top speed.

You need to run 2 packs with either motor. You're tripping lvc.

Either that or a better pack, less cells, less KV, less prop, or lower/remove LVC. All will work, although if it is accurate a 3.2v cutoff is pretty low already and I wouldn't recommend running down to a cutoff that low or lower. Lots of people had issues with the 180s LVC cutting in too early when they first came out and had to switch it off, it is on v3 now so I would hope they fixed the issue, but who knows, maybe it is just typically Chinese quality control and some are good and some are not.

[airbiscuit]

1, depends on what you want from your boat, the smaller motor will offer more runtime, and the larger motor a higher top speed.


Either that or a better pack, less cells, less KV, less prop, or lower/remove LVC. All will work, although if it is accurate a 3.2v cutoff is pretty low already and I wouldn't recommend running down to a cutoff that low or lower. Lots of people had issues with the 180s LVC cutting in too early when they first came out and had to switch it off, it is on v3 now so I would hope they fixed the issue, but who knows, maybe it is just typically Chinese quality control and some are good and some are not.

1) Well for sure just want to have fun with my boat with some speed in mind. Not going for any race, just enjoying the hobby

I came across a post after reading some old threads here & I read someone runs the 36xx motor with 4s1p spinning the x437/3 propeller. His speed was in the 50s. I got the same propeller in hand & now started to think that I may remove the "LCV problem" with my current setup if I were to change motor.

[oscarel]

No way you're going to get into the 50s with a 36xx and a 437 on 4s. But it will eliminate the lvc problem. Best bet is what nativepaul posted. To keep speed, which sounds like what you want, is to add another lipo in parallel.

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[jim82]

If you just wanna have more run time with good temps on 4s ( with boats the higher c rating the better with lipo) ... I would go with a leo. 4074 1800kv or less kv if you still wanna use a 45c lipo(what brand) and really depends on your water temps at the moment.

[airbiscuit]

Just to update :

I am still with my current setup. No hardware(s) changes except for once I did tried a CNC 33mm 3 blade propeller & yes down sizing did allowed me to go full throttle but the Pursuit is slower. I changed back to Octura M445 & speed is back to normal. Now I am just limiting my throttle to not go full throttle & so far I am yet to trip the LCV.

[Heath M]

Remove the LVC.
Set a timer for 3mins and bring the boat back in.
Check voltage snd remaining % left in pack.
If still above 30% put a new pack in and set timer for 4 mins.
Check as above.
Keep doing this till u work out how many minutes it takes to run the pack down to 30%

[martin]

The leopard 4074 2150kv is a Y wind & needs 15 degrees timing by the way.

[ray schrauwen]

Leopard 3674 motors are usually approx. 5-10% more efficient than the 4074 series however less torque and slightly less speed. Again timing runs little by little as advised above is very important.

[airbiscuit]

Is the timing value critical to each wind?

[ray schrauwen]

Most D winds prefer 0- 5 degrees timing and a HET D winds say max 10 even though I stay on the low side. Y winds work better between 10-15 degrees timing.

[ray schrauwen]

Is the timing value critical to each wind?

Do you mean run timing or what I mentioned above?

[Fluid]

Is the timing value critical to each wind?

Yes. Too high and either motor overheats. Too low with a Wye wind and it can also run hot.


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