Help needed problem with hot connectors

[photohoward1]

Is anyone listening? Log all u want that prop has way too much pitch...

[Bigum]

Is anyone listening? Log all u want that prop has way too much pitch...

yes Iam listening, if you read what I wrote earlier I would prop down next timer

but I have used this prop without any problems so I dont think it is the only problem

[jkr]

At the time you do the bench test,check carefully the cable temps.
If your cables go hot you need to shorten them and i don't believe you need bigger than 6mm connectors.

[kevinpratt823]

At the time you do the bench test,check carefully the cable temps.
If your cables go hot you need to shorten them and i don't believe you need bigger than 6mm connectors.

If the wires get hot during a bench test under no load I highly doubt it would have anything to do with the length of the wires.

Like was stated, it sounds like too much prop, possibly over the course of a few runs, caused excessive heat at the connectors eventually allowing them to short, taking out the ESC because of it, and it is possible that the windings of the motor are now compromised as well.

[kfxguy]

Is anyone listening? Log all u want that prop has way too much pitch...

I'm getting to the point where someone asks a question or has a problem on here.....I type out a response, sometimes a long one and then I just delete it. Most of the time they aren't going to listen anyway. I feel like I'm wasting my time....

[Bigum]

photohoward1 and kfxguy and sorry if you feel Iam not listening I am but I dont feel it so clear as just to much prop please let me explain.

First:
This prop have been used in another boat with no problem this setup was
H&M Xzees II
BK elextronic warrior 9920 speedo(99amp con)
motor nemmesis blue xl(3675) 2382v
and this setup only had 3.5mm connectors on motor and there was no problem with heat on any part.

Second:

log1.jpg

When I look at this log file a see a fine temp so the speedo is working fine, the amp draw peak around 200 but fall to about 150-140 so that is safe within the speedos specs

the motor spec state 227amp max and again, so when using 200 as peak I dont see thats is a problem.

So please explain is I just wrong or are I missing something.

of course I will use a smaller prop next time but i just dont think it is so clear cut as to much prop

[kfxguy]

We're the batteries dead? Maybe I'm wrong but that's alot of voltage drop if the batteries weren't dead. If they were full and the voltage under load was 3.375v per cell....I'd think that was a bit low to be dropping....but I dunno...you said it worked in another boat so it should be good. (Hint, all boats aren't the same as far as how much power they pull, plus you had a different esc and motor....so your comparing apples to oranges when you said that.)

[Bigum]

maybe my batteries arent the best got them from hobbyking relative cheap, I now a¨the boat aren't the same, my point was they are both outriggers and about same size and weight, and the boat there could handle this prop had a speedo rated 120amp lower but a motor with same rpm/v but 36mm.
I only used 3.5mm bullet and they was not getting warm

[kfxguy]

maybe my batteries arent the best got them from hobbyking relative cheap, I now a boat are the same my point was they are both outriggers and about same size and weight, and the boat there could handle this prop had a speedo rated 120amp lower but a motor with same rpm/v but 36mm.
I only used 3.5mm bullet and they was not getting warm

Ok.

[jkr]

So
Have you done anything?

[Bigum]

no not jet, hopefully I can make some test in the weekend

[photohoward1]

What was your Max RPM? I don't see it on the graph.

[Bigum]

What was your Max RPM? I don't see it on the graph.

Around 34000rpm in the spikes, thinking the is jumping out of the Water, and 26000 to 28000 When loaded

[photohoward1]

I figure 3.5v per cell under load in my set-ups. He should be turning 50,190 Rpm with that set-up. 26k when loaded.. He is just Creating Heat. BTW I have an Excel Spreadsheet I use to figure approximate set-ups and it says with that set-up he would theoretically do. 120mph.... (ive been using it for 10 years it gets me pretty close.

You listen to me or figure it out yourself. I'm out.....

[kfxguy]

I figure 3.5v per cell under load in my set-ups. He should be turning 50,190 Rpm with that set-up. 26k when loaded.. He is just Creating Heat. BTW I have an Excel Spreadsheet I use to figure approximate set-ups and it says with that set-up he would theoretically do. 120mph.... (ive been using it for 10 years it gets me pretty close.

You listen to me or figure it out yourself. I'm out.....

2390kv x 14.8v= 35,372rpm......am I missing something? He's running 4s, not 6s. I still agree that almost a 10k rpm drop loaded is not good. But what do I know?