Batteries are getting hot and puffing

[Brushless55]

get some sky lipo 30c from hobbypartz about $40.00. I've been running my SV27 on 5s2p with the aqua 60amp esc. I run it down till it cuts off almost everytime. I'm putting 2800mah back in a 2650 mah pack. And still no puffing and they balance just fine. the best part of it is if i do ruin them they're only $40 not $100+.

I'm betting those packs are actually 3300's not the advertised 2650mah

[mtbenjamin77]

I'm betting those packs are actually 3300's not the advertised 2650mah

I use two of these and they're only $30.00

http://www.hobbypartz.com/77p-sl2650-5s1p-30c-5555.html

[Brushless55]

I use two of these and they're only $30.00

http://www.hobbypartz.com/77p-sl2650-5s1p-30c-5555.html

If I didn't have so many packs right now, I would try some of those out..
thanks for posting..

[ethomp]

Just got back from another run with a pair of zippy soft packs 5000mah 45c 2s, move the strut down 1 1/8 in from 3/4 in. and man was she flying. Set my timer at 3.5 min for a total run of 4 min. and the batteries showed 3.70v each and took 2211mah to re charge them, so I think 4 min. is going to be the max time for this set up.

[Brushless55]

Just got back from another run with a pair of zippy soft packs 5000mah 45c 2s, move the strut down 1 1/8 in from 3/4 in. and man was she flying. Set my timer at 3.5 min for a total run of 4 min. and the batteries showed 3.70v each and took 2211mah to re charge them, so I think 4 min. is going to be the max time for this set up.

Glad to hear you got a good run!
Where is the bottom of your strut to the bottom of the sponsons?
Thanks

[785boats]

You do have a couple of other options.
A lipo Shield is set at 3.2V cut off & that usually leaves some capacity in the pack at cut out. You would have to do some testing. But it would be cheaper than new packs & you could use your good race packs.
http://www.offshoreelectrics.com/pro...hld-32&cat=136
Or Replace the ESC with one that has programable cutouts that can be set to 3.2 or 3.4V You would only need a $50.00 Turnigy 120A for that set up.

[ethomp]

Not sure how to get that mesurement I took it from bottom of hull to bottom of the strut where the prop shaft goes through. I ended up moving the strut back up 1/8 in. might be alittle slower but I seem to have more control in the turns. THIS THING IS TO FAST FOR OUR LITTLE POND!!! Need to find bigger waters.

[Stinger9D9]

It's also worth mentioning that the 40x57 prop is not stock on the UL-1. It's actually a pretty agressive upgrade that pushes things that much harder. You may want to try a 40x52/3. The lower pitch will slow things down a bit and lower the current draw.

I've been messing around with mine on that prop (and I have a pretty good "internal timer" that reminds me when it's time to bring her in), and everything stays nice and cool.
FWIW, I've never ran a set of batteries down to the stutter bump on an AQ ESC. I always suspected they go way too low for my comfort level.

[Make-a-Wake]

Just got back from another run with a pair of zippy soft packs 5000mah 45c 2s, move the strut down 1 1/8 in from 3/4 in. and man was she flying. Set my timer at 3.5 min for a total run of 4 min. and the batteries showed 3.70v each and took 2211mah to re charge them, so I think 4 min. is going to be the max time for this set up.

Something doesnt add up here.....................you took them down to 3.7v per cell and they only took 2200mah.........????......less than half of the capacity.........???....either you had a typo or the charger quit way before they were done or they are not 5000's. My 5000's take 5000 or better when at 3.7 resting voltage.

[ethomp]

Yes your right, that 3.7v reading was taken from another pack just forgot to go back and change my typo. I've been testing a brass 40-52 and it runs real good on that prop I just lose top end speed but after 4 min everything comes off nice and cool. I also ran a brass L40-57 and I think its out of balance because the back end starts to wag like a dogs tail. The best prop so far have been the stock plastic ones [sv27] I though I read somewhere that they were a 40-57? I need more batteries, these 4 min runs suck!!

[Make-a-Wake]

Try an x442.............a 2 blade will rev our better.

[ethomp]

I'll try that, thanks