Solved FT Radial C pack motor problems HELP

[Jo's squadron]

So I finished my FT3D and when I flew it on the C pack motor after 30 seconds I had no more power and my battery was discharged!!!
that was on a amazon 40amp esc, this did happened to me before and it was indeed the esc. But now I but a much better brand esc on it
(this time a 30amp) and write after take-off I had tuns of power, but again after 5 seconds the power went down (like a lot). But after flying for about 5min my battery was at a normal voltage. and almost every time I us the c pack motor my esc and motor got really HOT.
I am runing a SLOWFLY 9x6 prop on 4S... wich is what flitetest recommends!
So is it the motor or is it the esc?
I do have a 60amp esc that I could try but I dont want to risk braking or over heating that one too.
P.S. my motor is the FT Radial 2218 1180kV Brushless Motor v.2

Pleas help.
Thanks in advance for the replies.

 

[Merv]

...I am runing a SLOWFLY 9x6 prop on 4S... wich is what flitetest recommends!...

I'm guessing the 9x6 prop recommendation is for a 3S setup.
It sounds like you have too much prop for 4S.

 

[Jo's squadron]

I just flew it on 3S and it did the same thing. So I dont think its the prop.

 

[Foamforce]

I just flew it on 3S and it did the same thing. So I dont think its the prop.

When the motor and/or the ESC is too hot, it’s almost always the prop. I say almost because it could also be something like a bad bearing causing extra load, but that’s uncommon.

Do this one simple experiment. Put a smaller prop on. Try an 8”. See if it still gets so hot. If not, it’s the prop.

Ideally you want to measure the amps drawn by the motor and not exceed the rating. But if you don’t have that, you touch it and see if it’s too hot.

PS, the slowfly prop draws more amps than a standard non-slowfly prop.

 

[Jo's squadron]

When the motor and/or the ESC is too hot, it’s almost always the prop. I say almost because it could also be something like a bad bearing causing extra load, but that’s uncommon.

Do this one simple experiment. Put a smaller prop on. Try an 8”. See if it still gets so hot. If not, it’s the prop.

Ideally you want to measure the amps drawn by the motor and not exceed the rating. But if you don’t have that, you touch it and see if it’s too hot.

PS, the slowfly prop draws more amps than a standard non-slowfly prop.

thank you for the input. I will try a normal non-slowfly prop (a 9x4.5, the flitetest ones).
I dont think that I have A 8in prop though.
I will test it today and tell you how it goes.
I will try 3S and 4S.

 

[Jo's squadron]

So I tried it on 3s and 4s, on a 9x4.5 non-slowfly prop. 3s did the same thing but 4s was good with a consistent amount of power, and after 6 or 7min of flying the battery was at about 15.4v. So I think that the cheap 40a amazon esc died because I pulled too many amps out of it, but the better brand 30a esc had a max amp auto cut-off wich resulted in the low but constant battery usage.
what do you guys think???
P.S. why did the 3s do the same ting? well I think that its because my battery was discharged before the flying (even tough I thought it was).
and on 4s after flying the motor and esc were only slightly warm.

 

[Mr Man]

So I tried it on 3s and 4s, on a 9x4.5 non-slowfly prop. 3s did the same thing but 4s was good with a consistent amount of power, and after 6 or 7min of flying the battery was at about 15.4v. So I think that the cheap 40a amazon esc died because I pulled too many amps out of it, but the better brand 30a esc had a max amp auto cut-off wich resulted in the low but constant battery usage.
what do you guys think???
P.S. why did the 3s do the same ting? well I think that its because my battery was discharged before the flying (even tough I thought it was).
and on 4s after flying the motor and esc were only slightly warm.

Well I’m glad you’ve got it figured out!

 

[Piotrsko]

I dunno I run 11x4 1/2 props no problem. 50 amp esc with heat sink, 3 cells.

 

[Mr Man]

I dunno I run 11x4 1/2 props no problem. 50 amp esc with heat sink, 3 cells.

I‘ve done 10 inch props on power pack b equivalent motors and they worked OK.

 

[Jo's squadron]

Y’a I should get a 50a esc soon.

 

[Jo's squadron]

Thanks all for your help and replies👍🏻