Tp4070 vs 1530 neu in same boat, no changes

[kfxguy]

I was wondering what the sheer power difference is between the two. I was going to post a thread asking but decided to do a test for myself. I have two customers that's I'm building boats for two different customers that happen to be using those two motors in their builds. So the both told me throw them in my mono and test them. Here's the details:

Kbb34
Sf300 lite
6s. I use the exact same batteries. These runs were different days so there may be a +1 to -1 difference but you'll see there's no contest
Same prop. Abc 1914-10-50
Settings the same. Basically a motor swap and battery charge.

Tp4070 is 1770kv
Neu 1530 is 1580kv

Looking at the kv you'd think the tp would have an advantage......




Tp




Neu 1530





These motors are exactly the same size too. In the pic they may look slightly different but they are exactly the same size.

[kfxguy]

And to add to it, I changed props and ran it again. It went even faster. Not the result I had with the tp. I used the 1915 and 1914 any it went the same speed within a couple tenths of a mph. Here's the result of the 1915. Ridiculous for 6s with a 1580kv motor in my opinion. And I haven't even got the hull lined out yet

[ray schrauwen]

Really you're comparing apples to oranges but, nice to see some tests.

The 1527 is actually closer to a 4070 than the 1530 NEU. The Neu 1530 is a 1/4" longer than the TP so, its going to be less stressed than a higher kv smaller can motor.

A 4070 is actually only 18 oz's compared to a 1527's 21.8 oz's or the 1530's 23.8 oz's so, even comparing a 4070 to a Neu 1527 is a slightly out of sinc.
Then there is the price difference...
Tp motors are nice but a Neu is that much nicer...

[kfxguy]

Really you're comparing apples to oranges but, nice to see some tests.

The 1527 is actually closer to a 4070 than the 1530 NEU. The Neu 1530 is a 1/4" longer than the TP so, its going to be less stressed than a higher kv smaller can motor.

A 4070 is actually only 18 oz's compared to a 1527's 21.8 oz's or the 1530's 23.8 oz's so, even comparing a 4070 to a Neu 1527 is a slightly out of sinc.
Then there is the price difference...
Tp motors are nice but a Neu is that much nicer...

I won't disagree with you except on one thing. They are the same size. I had them side by side out the boat (should have taken a pic then) but they are the same size. Maybe the rotor is longer in the 1530, but the can s are the same size. Much bigger difference in power than I expected tho. Much bigger.

[kfxguy]

Really you're comparing apples to oranges but, nice to see some tests.

The 1527 is actually closer to a 4070 than the 1530 NEU. The Neu 1530 is a 1/4" longer than the TP so, its going to be less stressed than a higher kv smaller can motor.

A 4070 is actually only 18 oz's compared to a 1527's 21.8 oz's or the 1530's 23.8 oz's so, even comparing a 4070 to a Neu 1527 is a slightly out of sinc.
Then there is the price difference...
Tp motors are nice but a Neu is that much nicer...

On a side note, I've seen people wondering the difference. Including myself. I've been wondering for a while. Now I know. For sure.

[srislash]

Very interesting comparison Trav. You've got me looking at at a pair of 1521's now in place of my 4050's. Mmm...

[kfxguy]

Very interesting comparison Trav. You've got me looking at at a pair of 1521's now in place of my 4050's. Mmm...

I've tested a 1521 vs 4060 the same kv.... They were they same speed. Just letting you know. I think a 4050 would be a little less than a 1521.

[Jamey]

Wow Travis that is definitely an eye opener!

If you punch in even optimistic slip and efficiency numbers into the calculator; 1580kv, 6S, 100% eff, 15% slip, 1.5 ratio, 45mm dia it only computes out to 75mph. But you got 80mph. Man I would be curious to know what RPM you are turning to run that fast. Surely the label is right on the can?

[kfxguy]

Wow Travis that is definitely an eye opener!

If you punch in even optimistic slip and efficiency numbers into the calculator; 1580kv, 6S, 100% eff, 15% slip, 1.5 ratio, 45mm dia it only computes out to 75mph. But you got 80mph. Man I would be curious to know what RPM you are turning to run that fast. Surely the label is right on the can?

I'll have to check it with my kv checker.

Couple things:

1) batteries being used are 4.27v per cell
2) prop is 48.3mm, not 45.
3) abc pitch is a tad more aggressive than octura.

[Jamey]

So the 80mph run was actually with the 1915 not the 1815? I'm still thinking of trying one if they come back in stock lol

[kfxguy]

So the 80mph run was actually with the 1915 not the 1815? I'm still thinking of trying one if they come back in stock lol

Yea. Sorry about that. My phone seems to autocorrect me on stuff I type more. I fixed it. To clarify all runs on this boat were with a 19 series prop. The 1914 went 76.6 and the 1915 went 80.1 apologies for the misprint.

[kfxguy]

Do note these props cavitate a bit before 20ish mph on a mono depending on how far the prop is from the transom. On my voracity the same props cavitate about half as far but the prop is further from the transom. These props bite well on a cat however.

[dmitry100]

kfxguy: I know we talked about this in another thread, but what do you think the differences might be between a 1521 2900kv on 5s and a 2050kv on 6s? Would the higher kv option be making up for it in higher amp pull, or am I just trading torque for rpm here for the same result. Or should I just go with it and find out for myself

[kfxguy]

kfxguy: I know we talked about this in another thread, but what do you think the differences might be between a 1521 2900kv on 5s and a 2050kv on 6s? Would the higher kv option be making up for it in higher amp pull, or am I just trading torque for rpm here for the same result. Or should I just go with it and find out for myself

This depends on the hull and the weight and what your trying to do. The 2900 is going to pull a lot more amps on 5s vs a 2050 on 6s.

[dmitry100]

Well, it'd be for my Shocker... I got a new esc on the way so it'll handle the increase in amps. Plus I'll most likely use the extra 5s packs for the kbb45 for 8s.