Mean machine motor help

**Fluid** · 09-25-2010, 09:44 PM

The 1518/1Y has a Kv the closest to your current 9XL, but it is actually a bit lower. With the same prop there will be little difference in speed, although the Castle will probably run cooler. Remember that both motors are budget types and are built in China....as far as I know in the same factory - but probably not. Neither will have quite the efficiency of the US-built Neus.

The 1518 may even be slower with the same prop, but it will have higher torque so it will be able to swing a larger higher pitched prop. That will be the way to get higher speeds with that motor. To use your current prop and 4S voltage you need a motor with a higher Kv to go much faster.

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**Make-a-Wake** · 09-25-2010, 09:57 PM

I'd run a Leopard 4074 on 4s.

**catboat** · 09-25-2010, 10:07 PM

Originally posted by Fluid

The 1518/1Y has a Kv the closest to your current 9XL, but it is actually a bit lower. With the same prop there will be little difference in speed, although the Castle will probably run cooler. Remember that both motors are budget types and are built in China....as far as I know in the same factory - but probably not. Neither will have quite the efficiency of the US-built Neus.

The 1518 may even be slower with the same prop, but it will have higher torque so it will be able to swing a larger higher pitched prop. That will be the way to get higher speeds with that motor. To use your current prop and 4S voltage you need a motor with a higher Kv to go much faster.

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Wow!!, thanks for responding, I didn't know there where NEU - China motors and NEU US motors...

Based on your comments, It seems that larger pitched prop is necessary. If I change props, what are your thoughts on going with the 1520 or 1717? If I can get away with only a prop change then I'm ok (for now). Down the road, (when funds improve) I could upgrade to 6S and then I would hope to have a crazy fast MM while still running cool temps (hopefully).

Thanks for your thoughts.
Sak.

**keithbradley** · 09-25-2010, 10:10 PM

Originally posted by catboat

Wow!!, thanks for responding, I didn't know there where NEU - China motors and NEU US motors...

Based on your comments, It seems that larger pitched prop is necessary. If I change props, what are your thoughts on going with the 1520 or 1717? If I can get away with only a prop change then I'm ok (for now). Down the road, (when funds improve) I could upgrade to 6S and then I would hope to have a crazy fast MM while still running cool temps (hopefully).

Thanks for your thoughts.
Sak.

I would think that you are going to be at the end of your rope with that esc if you go to a larger can motor and a larger prop.

**catboat** · 09-25-2010, 10:46 PM

Originally posted by keithbradley

I would think that you are going to be at the end of your rope with that esc if you go to a larger can motor and a larger prop.

Yeah that's what I'm worried about as well.

Do you have any idea what type of performance differential you can get between the 1515 1y vs 1717 1y? (Assuming the esc limitations are addressed)..

**keithbradley** · 09-25-2010, 11:12 PM

You should be able to swing a little bit bigger prop with the 1717, and the lower kv will allow you to run a higher voltage and draw less current at the same RPM (once you have an esc that is capable).

**Make-a-Wake** · 09-25-2010, 11:12 PM

The 1717 is probably 40-50% more powerful as it is a 46x85 compared to 40x75 for the 1515. You would need 5 or 6s with the 1717.

**catboat** · 09-26-2010, 03:22 AM

So, what do you guys think.... if I change the prop, get a 180A or 240A esc would you go with NEU 1520 1Y or the NEU 1717 1Y?

My goal is
1) a cooler running motor (the 9xl tends to run hot in my existing setup)
2) higher speed (is that possible on 4S 40C 5000mah?)

Thanks for all you input....

**Scott T** · 09-26-2010, 03:35 AM

I personally think a 1717 would be too much for a sport MM. Are you running 1P?

Is your motor list due to the sale on Castle Neu motors? Out of the 3 motors you listed I would go with the 1518, and possibly get an M445 or X642 if the 442 doesn't reach the speeds you want.

I'm interested in your current set up though. I had an MM with an 8XL on a 442 with the same ESC, and the motor never ran hot (even though it's a 'hotter' motor than your 9XL). I'd suggest looking at the reason your 9XL is running hot with your current set up, because based on my MM experience it should handle it easily.

As suggested, the 2200 kV Leopard 4074 is another option I'd consider (I also ran my MM with a Neu 1515/1Y, same ESC).

Cheers,
Scott

**catboat** · 09-26-2010, 04:07 AM

Originally posted by Scott T

I personally think a 1717 would be too much for a sport MM. Are you running 1P?

Is your motor list due to the sale on Castle Neu motors? Out of the 3 motors you listed I would go with the 1518, and possibly get an M445 or X642 if the 442 doesn't reach the speeds you want.

I'm interested in your current set up though. I had an MM with an 8XL on a 442 with the same ESC, and the motor never ran hot (even though it's a 'hotter' motor than your 9XL). I'd suggest looking at the reason your 9XL is running hot with your current set up, because based on my MM experience it should handle it easily.

As suggested, the 2200 kV Leopard 4074 is another option I'd consider (I also ran my MM with a Neu 1515/1Y, same ESC).

Cheers,
Scott

Hey Scott -

That was a good observation!!! Initially, I didn't intend on upgrading given my current financial disaster, ...however, the castle sale is extremely inviting, hence why I was thinking the NEU's.

I am running 2S1P x 2 in series (14.8v total). Your probably right regarding the 1717. So my next thought would be the 1520. The question would be could I still use my existing esc with the 1520? Regarding the power, if it's a bit overpowered, how bad could that be...also, maybe that motor would be good for a future boat...(That's my thoughts but again, I'm still learning, so I'll love to hear your ideas on that).

What kind of performance would you expect to see with the 1518? What was your performance on the 1515?

Regarding my existing setup, I've gutted the entire boat and I've improved the water cooling, engine mount setup, & I'm installing a new shaft (w/S bend). I haven't completed everything yet to determine the temp results...

Thanks again & I'd love to hear your thoughts on this stuff.

Sak...

**BakedMopar** · 09-26-2010, 04:20 AM

IME most 15 series and higher NEU will be pushing the limits on 1p. I have no experience with the Castle/Neu motor so I can comment on those. Fluid is on the money as usual. The benefits of moving to a larger can is the ability to run larger / higher pitched props. That's where the extra speed comes from.

**Scott T** · 09-26-2010, 04:38 AM

Sak,

I'd still lean towards the 1518 and run 2x2S. The 1520 would need a big prop or more cells to get the performance you're after. Then you'd be pushing the limits of the ESC. The 1518 should be pretty flexible for 4S options in the future.

I don't know what speed my MM was going with the 1515, I haven't put a GPS in my boats for years! Since they're race boats, I just aim to be the same pace as the fast guys for the race water conditions. But I would estimate it was in the low 50s. The 1518 should get to the same, probably using an M445.

If you can, add a fan to the ESC (if not water cooled) for extra insurance. The Castle (Barra?) 125s can handle quite a bit of power with some form of cooling.

My MM build is here, if you're interested - http://forums.offshoreelectrics.com/...=aussie+racing

Scott

**catboat** · 09-26-2010, 09:26 AM

Originally posted by Scott T

Sak,

I'd still lean towards the 1518 and run 2x2S. The 1520 would need a big prop or more cells to get the performance you're after. Then you'd be pushing the limits of the ESC. The 1518 should be pretty flexible for 4S options in the future.

I don't know what speed my MM was going with the 1515, I haven't put a GPS in my boats for years! Since they're race boats, I just aim to be the same pace as the fast guys for the race water conditions. But I would estimate it was in the low 50s. The 1518 should get to the same, probably using an M445.

If you can, add a fan to the ESC (if not water cooled) for extra insurance. The Castle (Barra?) 125s can handle quite a bit of power with some form of cooling.

My MM build is here, if you're interested - http://forums.offshoreelectrics.com/...=aussie+racing

Scott

Hey Scott -

I really liked your MM build...after I'm done redoing mine it'll be similar to what you've got there if some few exceptions. Regarding my ESC Barra 125, I've added water cooling to it.

I've got a question for you...I noticed you add a "safety loop" between the esc & batteries. Why are you doing that?

Thanks.
Sak...

**Make-a-Wake** · 09-26-2010, 09:50 AM

A safety Loop allows you to cut power immediately upon reaching your boat, even with the canopy shut and taped.....................safety factor.

Mean machine motor help

Mean machine motor help

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