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View Full Version : Run Time and Largest lipos that fit?


x2beach
08-12-2009, 09:38 AM
What is the largest lipo you can fit ? I have some SMC 2c9000 pack. will they fit ? the specs (Length: 153mm; Width: 43mm; Height: 28mm )

Also what kind of runtime you getting with 3200 Lipos?

thanks
mickvk
08-12-2009, 04:23 PM
I thought I got 9 mins out of my 3700 25c's.... But I have to check that.
6S HYDRO
08-12-2009, 04:31 PM
9-10 min. Out of 3700's--- what.... Are they paralleled
Doby
08-12-2009, 04:33 PM
They would have to be..............but even that would be pushing it.....
6S HYDRO
08-12-2009, 04:38 PM
Yeah, the heat would be detrimental
mickvk
08-12-2009, 04:39 PM
Nah, they're just a stock series set up. I've only had two days with the boat so maybe my time was off. Sorry. I'll double check this weekend.
Brushless55
08-12-2009, 08:24 PM
I get 9-10 out of my 3700 25c's.



10min on 3700s ? :confused2:
Drag Boat Bob
08-12-2009, 08:53 PM
Nah, they're just a stock series set up. I've only had two days with the boat so maybe my time was off. Sorry. I'll double check this weekend.

That is a good idea...
mickvk
08-13-2009, 01:11 AM
What is the largest lipo you can fit ? I have some SMC 2c9000 pack. will they fit ? the specs (Length: 153mm; Width: 43mm; Height: 28mm )

thanks

The box in the front of the boat is shallow height at the nose, 30mm. Goes to 45mm at the motor mount. The length is 145mm from nose to motor mount. The width on either side of the motor is 47mm. I haven't tested any big batteries. Just rattling off quick measurements for you.
mickvk
08-17-2009, 09:08 AM
I metered a run using two JackPower 2S 3700's in series. Moving avg speed 19MPH. Max spd 36. Stock except for the prop - aquacraft 40-52/3. Run time, 7.5 mins.
mickvk
08-17-2009, 09:09 AM
That is a good idea...

Have a nice day
Brushless55
08-17-2009, 02:29 PM
I metered a run using two JackPower 2S 3700's in series. Moving avg speed 19MPH. Max spd 36. Stock except for the prop - aquacraft 40-52/3. Run time, 7.5 mins.


how many Mah are you putting back into your packs?
Raydee
08-17-2009, 08:44 PM
I swear I read somewhere that someone was running the 5500mah G3 cells which are pretty long?
v-spec
08-17-2009, 11:28 PM
Mine are 175x46x18 size 2s1p they just fit but they don't rub.
Drag Boat Bob
08-17-2009, 11:48 PM
Have a nice day

I am sooo sorry, I thought that you might be damaging your lipos.

Hey, go ahead, what do i care...
Brushless55
08-17-2009, 11:58 PM
Mine are 175x46x18 size 2s1p they just fit but they don't rub.


Hey how's the Proboat esc and motor working for you?
v-spec
08-18-2009, 12:12 AM
It's running great I'm really happy with my boat right now. GPS'ed 42+ tonight with an X442. Looking to buy a little more aggressive prop now. And adding the gps slowed it down noticeably.
mickvk
08-19-2009, 12:58 AM
how many Mah are you putting back into your packs?

Since the OP was looking for run time, I ran it to the cut off. The 3700 packs took 3500 MAH.

have a good one.
Brushless55
08-19-2009, 01:03 AM
were these ran in parallel to get 9min runs?
mickvk
08-19-2009, 08:04 AM
I am sooo sorry, I thought that you might be damaging your lipos.

Hey, go ahead, what do i care...

Thanks for the help. Have a good one.
mickvk
08-19-2009, 08:08 AM
were these ran in parallel to get 9min runs?

If you're replying to my post saying I got 9-10 minutes, that was bad info. Two 3700 packs in series ran 7.5 minutes
Doby
08-19-2009, 09:12 AM
Is your Low Voltage protector on your speed controller kicking in after 7.5 minutes?
mickvk
08-19-2009, 12:01 PM
Is your Low Voltage protector on your speed controller kicking in after 7.5 minutes?

Yes, I'm pretty sure it did. I could tell the boat was slowing down so I took it in. I think that's what the manual refers to as the "stutter warning system". I have not changed the stock ESC programming and I run standard 4S.
6S HYDRO
08-19-2009, 12:09 PM
your gonna damage those lipos buddy, thats what weve been trying to explain to you
6S HYDRO
08-19-2009, 12:10 PM
3minute runs max, and you should be running full or close to full throttle the whole time. Or else youll damage your esc cap and your cooling will not be working effectively
mickvk
08-19-2009, 01:11 PM
3minute runs max, and you should be running full or close to full throttle the whole time. Or else youll damage your esc cap and your cooling will not be working effectively

The manual does clearly agree with the partial throttle part. But I can't stay deep in the throttle due to my water conditions. I keep flipping it. I guess I picked the wrong hull for the lake I live on. :)

I have kept a close eye on temp (spektrum DX3S real time temp) and haven't had a problem... Yet!
6S HYDRO
08-19-2009, 01:16 PM
check your battery temps
mickvk
08-19-2009, 01:18 PM
your gonna damage those lipos buddy, thats what weve been trying to explain to you

I thought I was operating within "normal" use - keep voltage over 2.9 per cell. Keep temperature under 130F. But I wont press my luck with hitting the Low Voltage Cutoff. It's just like driving my automobile - I don't need to actually hit the rev limiter just because I can. Thanks for the advice.
6S HYDRO
08-19-2009, 01:32 PM
yes it will make the batteries puff after time, try to get 2 good 3min runs in off a set of 3700's and it should still have a little left in the batteries. for fe it is good not to take out more than 80% of your batteries mah- they'l last longer and run better
6S HYDRO
08-19-2009, 01:36 PM
i usually run them till about 3.75 volts per cell- thats with no load on them(not running the boat) if they were under load they would probably be @ around 3.0-3.3 volts per cell. it takes a lot of power to push a prop thru water- its nothing like rolling on a bearing on the ground like in a rc car