Lipo high C vs high volt

[Shun Tung]

Dear all Master ,

Would you please teach me if one of the lipo is 150 c 11.1 v and 60 c 14.4 v which one is more power in the hydro boat ? My hydro is atomik
Miss Excite . Please advise !!


Thanks you so much!!


Dragon .

[fjelling]

Edit: Sorry, was a bit fast here...

Power = Voltage x (Ampere x C-rating)

(150C x Ah) x 11,1 = W

(60C x Ah) x 14,4 = W

[Fluid]

Power = Voltage x Ampere.....150 x 11,1 = 1665W......60 x 14,4 = 864W

Unfortunately this is not correct, the "C" value is not amps but rather it is the discharge rate based on cell capacity. Maximum 'safe' amps = "C" x Ah. We cannot calculate the amps without knowing the cell capacity, and we can't calculate watts without knowing the amps.

To the OP: Assuming that you are using the stock Atomik components, 4S may be too much voltage for your hydro motor, it will depend on the motor's Kv (rpm/volt). The controller will not handle the maximum amps either of the packs could supply without failng, so the "more power" answer is 4S....but the prop choice will have to be safe or you may blow up the motor and/or the ESC. The recommended voltage by the manufacturer is 3S. Use 4S at your own risk.


.

[BILL OXIDEAN]

Dear all Master ,

Would you please teach me if one of the lipo is 150 c 11.1 v and 60 c 14.4 v which one is more power in the hydro boat ? My hydro is atomik
Miss Excite . Please advise !!


Thanks you so much!!


Dragon .

The short of it, use the 14.4 60c lipo and you will absolutely love it! In fact, you don't have to even make a prop change although I recommend our CNC 36mm prop which is same dimensions as stock http://www.atomik-rc.com/Alloy-Prop-...category=76920

Stock system will handle it all night long in fact, the boat was top qualifier, won 3 out of 4 heats in PLTD Sport Hydro 2011 Gary Johnson Grand Prix Classic.
Our club let me run it, because the specs of the motor are supposably less power than current PLTD motor specs (less KV/KT)
Miss excite is a very fast and stout boat bone stock. The boats we used in this video were stock. Mine (in the aerial views) has an upgraded prop, and turn fin.
Not sure if they were running 4s but I certainly was : ) The powerplant in our Miss Excite is strong and well ballanced. I've got 2 miss excite motors here still running perfect. Guys at our pond not only run 4s but upgrade to some very stout props such as V937 Octura

Check the Vid: http://www.youtube.com/watch?v=1yix7COoLGE

Not "fluffing" things because I race for them, just stating facts. There are several Miss Excites bone stock running 4s on youtube if you think my opinion is skewed : )

[BILL OXIDEAN]

Here are a couple of examples : )

http://www.youtube.com/watch?v=ZqX5I22o_tA

http://www.youtube.com/watch?v=VQ2r6W5Z5jI

[Shun Tung]

Dear Master Bill,
You are correct this miss excite is very fast and stable to fun in 14.4 v . I use 2 cell 14.4 v 4000mah 40c to run.
It 's very good but one things I can't use more than 4000 mah lipo because inside no room for me to place the lipo.
Do you thing Vernon 7.4 v 3800 mah short pack x 2 can place in this boat and I saw you play this boat in golden gate
park Spreckels lake . Did you change the bearing but you didn't wrote this part number . So I checked the Boca bearing customer service send back email to me . Would you mind teach me what spec lipo , band and how to adjust this boat for good of this boat .

Thanks you so much and thanks every master to reply .

I'm sorry about my English not very good but I hope all the master understand !!!



SMF74C-2YS NB2 Radial Bearings
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SMR74C-2YS NB2 Radial Bearings
4 x 7 x 2.5 Millimeters
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[ReddyWatts]

Edit: Sorry, was a bit fast here...

Power = Voltage x (Ampere x C-rating)

(150C x Ah) x 11,1 = W

(60C x Ah) x 14,4 = W

You are correct that a 11.1 volt battery with a 150 C rating will provide MORE WATTS than a 14.4 volt battery with a 60 C with same MAH rating.

Formula to calculate a batteries “Maximum Watt Rating”.
(MAH/100) X (C rating/10) = Battery Maximum AMP rating
(Battery Maximum AMP rating) X (Battery Volts) = Maximum Battery WATT rating

(5000MAH/100) X (60C/10) = (300 amps) X (14.8 Battery Volts) = 4440 WATTS
(5000MAH/100) X (150C/10) = (750 amps) X (11.1 Battery Volts) = 8325 WATTS

Just thought the title of this thread was interesting.

[Shun Tung]

Thanks you every master ! that's means if I buy Maxamp 11.1 v 4000mah 150 c lipo may be faster than 14.4 v 4000mah 60c lipo ?

[ReddyWatts]

No it just means that the 11.1 battery has a higher power rating. For your setup I would use what has been suggested.

[tlandauer]

Thanks you every master ! that's means if I buy Maxamp 11.1 v 4000mah 150 c lipo may be faster than 14.4 v 4000mah 60c lipo ?

Simple observation:
The higher the voltage , the faster the motor turns, in most cases the faster the boat goes given the condition that all parameters are similar: props, water (wave size), strength of wind, etc... Discounting any potential failure due to disregard for proper set up. ( not saying your set up is wrong, just saying in general)
If you are ready to spend that much money on Maxamp, I will look at Dinogy Lipo before making a final decision, Maxamp is not used by most guys here. I don't bash brands, but go get something that is well proven.

http://dinogylipos.com/

I am no master

[martin]

The Miss excite with the stock motor will run much faster with 4s 14.8v than using 3s 11.1v, the motor is 2000kv x 14.8v =29600rpm unloaded. On 11.1 = 2000kv x 11.1v = 22200rpm unloaded.

[danielplace1962]

If the amps you plan to pull from a pack is say only 30C then a 120C probably wouldn't do you much benefit over if you had bought a 60 C pack. The C rating only helps when you need that much. If you buy double what you need it will do as good as if you had quadruple the C rating.

To get an idea you can relate to you could think about C rating kinda like wire size. If a wire is large enough to safely supply the currect you intend to pull out of it then upsizing it a bunch isn't going to change much for the better just because it is bigger.

Another would be a circuit breaker. If you had a 3 amp load on a 15 amp breaker it would operate exactly the same as if you had put it on a 60 amp breaker.

[Wetter]

this is a good class.
so which acts as the breaker the esc or motor? which usually goes first?
(my boats run stock except buggies and planes ) and never blown a darn thing then again,i do not push them as hard or as long,
and i stay within the specs.
it helps when you have more than a few to play with.
P.S. But i usually break something before any thing gets so hot

[NativePaul]

You are correct that a 11.1 volt battery with a 150 C rating will provide MORE WATTS than a 14.4 volt battery with a 60 C with same MAH rating.

In theory yes, but in reality there is no such thing as a 150C battery yet. I think 60C is about as high a rating as I believe at this time although I hope it will continue to steadily rise as it has been doing. 150C is pure fiction and will be for quite some time.

[Wetter]

well how do they get away with these false or inaccurate claims,? gosh what fool would pretend somethn' he ain't?
like people that steal others identity should be escorted off the planet.