Hydro balance

[m4a1usr]

where is this FE calc...

Look here. http://forums.offshoreelectrics.com/...ead.php?t=5382

John

[ozzie-crawl]

you really need 4s on 5s its pulling huge amps which is killing your esc,s
even if you get a esc to handle the amps your killing your motor it pulling way to many watts
if you kill the motor while running it there is a chance you will kill the esc as well.

[sporthydrofan]

yep just dl the FE Calc program very nice indeed!
looks like the 580L would run very nice with the y537/3 prop and pull less amps

580L 2154KV
5S1P- 5 amp
36k rpm
95.6 amps
3 min run time
est. speed 65 mph
91% efficiency

looks like i only have to keep 145 watts cool!

looks much better than the x640 prop which runs much higher amps and less efficiency

[sporthydrofan]

ok the FE calc says 95 amps.... but when i put on the amp logger it runs 130 amps with this setup.... does FE have a section to input the size or weight of the boat?

[Flying Scotsman]

You need to run 4S max and buy an Esc rated for 180amps minimum with that motor. You have gone through 3 esc's so far as they were not up to the demands you subjected them to. How long do you want to run, as your setup is SAW presently.

Edit

Show us a print of your total run with your data logger

Edit

FE calc is only an estimate at best

Douggie

[sporthydrofan]

So FE is wrong?
I only blew 2 ESC's so far prop was wrong, the other ESC is fine right now it doesn't even get hot 110 Degrees F, the batteries last about 4 minutes.. im just wondering why the FE calc says 95.6amps and i got 130+ on the logger and the boat only ran 52 mph not the estimated 65mph... the motor specs says it handles up to 8S...

[ozzie-crawl]

when they say the 580 is good for 8s its they also give you a 50,000 rpm limit
which you dont want to go near.but if you ran a 6l on 8s your up around 64,000 rpm. to run 8s you would want a kv that will get you around 30,000
fe calc wont give you exact numbers and a lot depends on your setup
if setup wrong you will pull more amps etc.
the 130 amps your seeing are probably spikes not what your pulling constantly
under load

[Flying Scotsman]

A 580 8L or 9L may be better suited for 5S or 4S....lower amps and higher torque. It all depends on your run time and desired speed

Douggie

[sporthydrofan]

so going to a smaller prop wont help? i just don't have any 4Slipos.. and i have 2 brand new 5S's . it runs great now. but i was just worried about the 130 amp reading. Does FE Calc take into consideration the weight or size of the boat? does it matter?

[Flying Scotsman]

If you have two 5S, I would change the motor dependant on what you paid for the batteries. 25,000 to 29,000 rpm will give you a fast boat but not SAW speeds. Saw run times are about one minute and very hard on the wallet and equipment.

Douggie

[sporthydrofan]

i'm getting about 4 minutes of run time, i don't want saw setup i want a fast sport boat so 3-4 minutes is cool for me

[Jeepers]

25,000 to 29,000 rpm will give you a fast boat but not SAW speeds.

Douggie

I run upwards of 36,000 rpm in my N2 sport hydro I have no problem with heat or burning up equipment just have to prop accordingly, and the boat is FAST!

[sporthydrofan]

I run upwards of 36,000 rpm in my N2 sport hydro I have no problem with heat or burning up equipment just have to prop accordingly, and the boat is FAST!

ok so look at my setup from FE Calc should i go lower in prop size? say a y536?

[Jeepers]

ok so look at my setup from FE Calc should i go lower in prop size? say a y536?

thats what I recommended to you in a few posts back that and an x437! That y537 3 blade you used was.... ok but you add massive load with the extra blade. especially at that rpm your turning.

So far all the 3 blade props I have tested I have not been happy with them.

[sporthydrofan]

I just bought a Y536 it seems to give the most speed with the least amp load, it runs 50's now im very happy thanks guys!