ESC suggestions needed

[majorpat]

I am building a Mean Machine with a Tacon #4074 2150KV probably a 645 prop. Will a 120 amp ESC be enough?

Thanks Pat

[Heaving Earth]

I doubt it

[J.W. Pepper]

I am building a Mean Machine with a Tacon #4074 2150KV probably a 645 prop. Will a 120 amp ESC be enough?

Thanks Pat

Pat,
Here... http://www.hobbypartz.com/96m802-4074-2150kv.html - it states the Tacon #4074 2150KV motor pulls 120amps at peak efficiency. In other words a 120amp ESC would be worked to death (regardless of prop size), not good, especially for boats.

Rule of thumb is that you should allow at least 30% overhead in a brushless setup (I do that for both my R/C trucks & my boats). The overhead is because no ESC operates at peak efficency, there's also the various unexpected circumstances.

So to answer your quesiton in plain english: take the maximum amps the motor is rated at and add 30% to it, 120A + 30% = 156A.

So you want to use a Seaking 180amp ESC (or equivalent) as the minimum. That gives you plenty of overhead / safety net so you don't have to worry about burning up your electronics.

About props: they can & do effect the load on the motor, which in turn increases the load the motor puts on the ESC. Another good reason to allow overhead.

Pay a little extra now, or a lot later to fix damage, choice is yours.

Good luck

[J.W. Pepper]

I doubt it

Hey Einstein, how come you can't give people simple answers to simple questions??

In this thread... http://forums.offshoreelectrics.com/...tock-esc-BJ-26 - the op asked... "I am trying to figure out what everything means, Kv, pole, sizes, and the wind?"

In post #2 you told him "For 6s you want 1500kv or so. Shaft size 5mm Can size 36mm should be good."

Gee Einstein that's nice, he said he does not know what KV means!! He also stated "that he did not understand sizes", and you immediately start babling about KV's, shaft & can sizes. How is that helping him when does not know WTF any of that B$ means??

14 posts later and not one of you so called "experts" had answered ANY of his original questions. So I did, long winded post?? Yes, had any of you "experts" answered at least some of his questions, it would have been a lot shorter.

Now in this thread the op asked if a 120A ESC would work. If you really are a R/C person instead of a forum troll, than you would know that HobbyPartz sells Tacon motors, I did. It took me just a few minutes to get the tech specs on that motor so I could give him an "intelligent answer" - see post #3.

You and your co-horts have no problem bashing, ridiculing, denigrating, me; but non of you "experts" are capable of providing people with simple direct answer's to their questions. Rest assured, I am not the only member of this forum who feels this way!! I am in the process of answering a PM sent to me about nit-wits like you.

Expert?? Yeah right, here's your sign....

[Heaving Earth]

Hey Einstein, how come you can't give people simple answers to simple questions??

In this thread... http://forums.offshoreelectrics.com/...tock-esc-BJ-26 - the op asked... "I am trying to figure out what everything means, Kv, pole, sizes, and the wind?"

In post #2 you told him "For 6s you want 1500kv or so. Shaft size 5mm Can size 36mm should be good."

Gee Einstein that's nice, he said he does not know what KV means!! He also stated "that he did not understand sizes", and you immediately start babling about KV's, shaft & can sizes. How is that helping him when does not know WTF any of that B$ means??

14 posts later and not one of you so called "experts" had answered ANY of his original questions. So I did, long winded post?? Yes, had any of you "experts" answered at least some of his questions, it would have been a lot shorter.

Now in this thread the op asked if a 120A ESC would work. If you really are a R/C person instead of a forum troll, than you would know that HobbyPartz sells Tacon motors, I did. It took me just a few minutes to get the tech specs on that motor so I could give him an "intelligent answer" - see post #3.

You and your co-horts have no problem bashing, ridiculing, denigrating, me; but non of you "experts" are capable of providing people with simple direct answer's to their questions. Rest assured, I am not the only member of this forum who feels this way!! I am in the process of answering a PM sent to me about nit-wits like you.

Expert?? Yeah right, here's your sign....

In a thread about props you gave the op terrible advise on prop size based on completely wrong math calculations suggesting a 42x59mm spartan prop is equal to an x648. Bad.
I may not be as detailed as you but my advise is at least correct when I give it.

[Heaving Earth]

Anyways pat, yes a t180 would be good for your motor.

[nata2run]

I am building a Mean Machine with a Tacon #4074 2150KV probably a 645 prop. Will a 120 amp ESC be enough?

Thanks Pat

my 4074 in my Genisis with a 40mm prop cooked a SF200 on 6s. So far the T180 is going ok at around 70mph. If you are running a 645 on 6s you could pull way over 200a. I think a 120a would blow in the first 20 sec. a T180 should would work on 5s.