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Old May 06, 2012, 04:46 AM
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Mikethk's Avatar
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New setup performance......

Hi.

I upgraded my setup from:
Motor: 745W, 1240Kv http://www.modelskibet.dk/product.asp?product=6531
ESC: 120A http://www.hobbyking.com/hobbyking/s..._Boat_ESC.html

To:
Motor: 2400W, 1300Kv http://www.offshoreelectrics.com/pro...o-4092&cat=148
ESC: 180A http://www.hobbyking.com/hobbyking/s..._Boat_ESC.html

Same batteries are used. 25C, 22v2

But the performance seemed to drop down?
Why is that?
Its like when i have the propeller above water, then it goes nice fast, but as soon as i put it into the water, i cant archive the same top RPM.

Im thinking, maybe there is no enough power for the bigger motor/ESC.

But what could the problem be?

Mike
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Old May 06, 2012, 05:39 AM
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Sneek, Netherlands.
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Double post, sorry.
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Last edited by pompebled; May 06, 2012 at 05:50 AM. Reason: goofed up.
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Old May 06, 2012, 05:49 AM
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Hi Mike,

Your Lipo's can't provide the power for the new motor.
Did you use the same prop, or did you prop down for testruns?

25 x 5,8 = 145A
The motor average output is 2400W : 22,2V= 108A
The bursts can be easily twice as much = 200A+

You'll need 40C lipo's or more (preferably parallel packs) for this set-up.

Regards, Jan.
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Old May 06, 2012, 06:13 AM
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I'll do a "what he said" on Jan's post and add that you need to be sure to check your esc timing on that motor. The 4092 1300kv is a D wind and should have the timing set just above 0 degrees. (3.75 degrees works well)
The default factory timing on the Turnigy 180 is around 15 degrees and if left unchanged will cook something.
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Old May 06, 2012, 08:40 AM
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Thanks Bill, I knew I was forgetting something cruicial...

Most likely because I don't own one of those ESC's.

Regards, Jan.
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Old May 06, 2012, 11:31 AM
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Quote:
Originally Posted by pompebled View Post
Hi Mike,

Your Lipo's can't provide the power for the new motor.
Did you use the same prop, or did you prop down for testruns?

25 x 5,8 = 145A
The motor average output is 2400W : 22,2V= 108A
The bursts can be easily twice as much = 200A+

You'll need 40C lipo's or more (preferably parallel packs) for this set-up.

Regards, Jan.
I used the same prop as with the first setup.

25 x 5,8 = 145A What are those calculation? 25? 5,8?

The feeling i get is that when the motor is above water, it can go as fast as it needs. But when underneath it cant go fast anymore.... So to say, it aint the prop size i believe.

Could i try to parralel my 2 packs running 11v1 with then 50C. If i can get the power as i get with 22v2 25C then it would be a pretty good test for showing that its the discharge of the battery that is wrong? I dont wanna buy new batteries if it aint the solution
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Old May 06, 2012, 11:33 AM
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Quote:
Originally Posted by bill34207 View Post
I'll do a "what he said" on Jan's post and add that you need to be sure to check your esc timing on that motor. The 4092 1300kv is a D wind and should have the timing set just above 0 degrees. (3.75 degrees works well)
The default factory timing on the Turnigy 180 is around 15 degrees and if left unchanged will cook something.
Jan's post?

esc timing? How to check this? How do i set it? Sry. im still nab.

D wind?

Why will the Turnigy 180 cook somethign due to 15 degress? I dont get it. I wanna test this before working towards new batteries.

Best regards Mikethk
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Old May 06, 2012, 11:42 AM
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electric motors are timed just like a combustion motor so to speak. The timing for your "d" wind motor is low. So you need a programming card to change the timing of your ESC to 3.5 degrees. Also 25C batts can not typically provide the required amp draw for FE boats.
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Old May 06, 2012, 12:10 PM
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Quote:
Originally Posted by Mikethk View Post
Jan's post?

esc timing? How to check this? How do i set it? Sry. im still nab.

D wind?

Why will the Turnigy 180 cook somethign due to 15 degress? I dont get it. I wanna test this before working towards new batteries.

Best regards Mikethk
I was referring to the need for more battery as Jan said. Minimum of 40c for that motor with a 2p (6s x2 in parallel) being preferred to give it full power.
As wagondriver said different motors require a different timing on the esc to operate properly. D wind motors are typically more torquey than a Y wind but generate more heat and absorb more amps doing it. As a result you have to run lower timing to keep from overheating them.
Easiest way to set the timing on the Turnigy is with a programming card. http://www.hobbyking.com/hobbyking/s...idProduct=7187
Refer to the sheet that came with your esc for what the settings mean or to program it via your radio.
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Old May 06, 2012, 08:21 PM
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Jan, where did you get the 5.8ah? He never stated the capacity of his batteries
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Old May 06, 2012, 08:40 PM
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Coming back to referring to the sheet that came with the esc. Did you set the throttle end points? That's another thing you have to do with a Turnigy that I forgot to mention earlier.
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Old May 07, 2012, 03:49 AM
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Quote:
Originally Posted by boaterguy View Post
Jan, where did you get the 5.8ah? He never stated the capacity of his batteries
Check Mike's thread about his large and heavy hull.

Regards, Jan.
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Old May 07, 2012, 06:48 AM
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Alright, didn't realize there was another thread.
The calculation Jan did (5.8*25) was to calculate how many amps your batteries can put out.
The 5.8 is the capacity of your batteries, in this case your batteries are 5800mah (milliamp hour), but you have to change that to amp hours (/1000).
The 25 is the C rating of your batteries, there is usually a burst and constant, you want to use the constant. Beware with cheaper manufacturers these numbers may be a little bit exaggerated.
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Old Jun 12, 2012, 04:22 AM
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Hello everybody... Thx. The timing actually worked....

I changed it to 3,75 and now it goes alot faster.
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Old Jun 12, 2012, 02:56 PM
Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
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Hi Mike,

Good to hear you got it working!

Some pictures, or video would be nice...

Regards, Jan.
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