Is this how its supposed to look when its running VIDEO

[xlandguy]

Well I don't get how the ESC is 60 amp but the boat seems to pull more than that? And a 6,000mah 30c can do 180 amp continuous, way more than the ESC is rated for??? I would think those batts are plenty for this boat.

[Old Sloppy]

[QUOTE=pavmentsurfer;416953I have 8200's but only run them in my summit as they are only 30C.[/QUOTE]

a) 8200 30c = 246 amps rating

b) 5000 50c = 250 amps rating

c) 15000 40c /2 = 300 amps rating

this is what I run in my Cat, I have 2 motors so the 300 amps rating ( actual 15000 40c = 600 amps, but it is devided by 2 motors)

My batteries do not get hot. I estimate 125.3 amps (per motor).

Harry

[Brushless55]

Well I don't get how the ESC is 60 amp but the boat seems to pull more than that? And a 6,000mah 30c can do 180 amp continuous, way more than the ESC is rated for??? I would think those batts are plenty for this boat.

Higher amps maintains Voltage, more Watts, more RPMs = higher speeds

[DjFlipNautikz]

i run two 5000mah Turnigy 4s batteries in parallel. i actually have never tried 2s batteries because 3s and 4s is all i have. here is a video of her running.

[xlandguy]

So you get what, 10 mins runtime with the two 4s in parallel? Motor must get kind of hot running that long? And it looks like its going pretty good even with the added weight of all that battery!

[Brushless55]

So you get what, 10 mins runtime with the two 4s in parallel? Motor must get kind of hot running that long? And it looks like its going pretty good even with the added weight of all that battery!

If your cooling is setup proper, you wont have heat issues not matter how long you run
and on the flip side, a cooling system setup wrong wont last 1min

[pavmentsurfer]

Im not sure that 60 amp ESC rating is entirely correct. If I'm getting 2 50C batteries really warm after a run its obviously pulling a heck of alot more than 60 amps. Ive got a Turnigy 120amp ESC to go into this boat. I bought it mostly for the adjustable LVC... but I was thinking maybe it would also be more robust.

I got my battery information from the guy who actually sells the SPC packs that I run. Tom from SPC. His answer was that when the 8200mah pack is full then yes, your amp ratings are correct. However, when the battery is being drained and there is less MAH in the pack, your amp ratings drop as well. At the end of a run you may be pushing that pack too hard. Whereas a 50C rated pack can still deliver the amps when its empty because it is a true 50C... it sounded like good logic and Tom has never steered me wrong. He has an SV27 and runs it pretty hard. He also has thousands of dollars in data logging equipment and battery testing equipment. So, I trust that he knows his stuff.

[Brushless55]

Bad Logic from Tom

Im not sure that 60 amp ESC rating is entirely correct. If I'm getting 2 50C batteries really warm after a run its obviously pulling a heck of alot more than 60 amps. Ive got a Turnigy 120amp ESC to go into this boat. I bought it mostly for the adjustable LVC... but I was thinking maybe it would also be more robust.

I got my battery information from the guy who actually sells the SPC packs that I run. Tom from SPC. His answer was that when the 8200mah pack is full then yes, your amp ratings are correct. However, when the battery is being drained and there is less MAH in the pack, your amp ratings drop as well. At the end of a run you may be pushing that pack too hard. Whereas a 50C rated pack can still deliver the amps when its empty because it is a true 50C... it sounded like good logic and Tom has never steered me wrong. He has an SV27 and runs it pretty hard. He also has thousands of dollars in data logging equipment and battery testing equipment. So, I trust that he knows his stuff.

UHHHH???
so he Tom says that the 50c he sells can deliver what he says the packs can and others don't?
so he is saying that the 8200mah 30c (240A)pack when they are down to 1500mah only deliver 60amps but his 50c remain the same
not good logic at all, actually bull really...

and what temp is warm with your packs?
90*F
100*F
???*F
packs can get to about 140*F without harm
most packs heat up good when they go beyond 80% use
if you have 20% and greater left in the packs after a run and they are hot, then they are not true 50c to begin with..

[pavmentsurfer]

Tom says the packs he sells have been tested and proven to deliver a minimum of 50C... whereas MANY other companies packs DONT deliver their actual C rating. Im AM saying that yes.

However, what I'm NOT saying is what you wrote about the 8200's. Keep in mind, those packs are SPC's as well. What he said is that a 30c pack that is down to 1600mah is not putting out as many amps as a 50C pack that is down to 1000mah. I don't run my packs below 3.6vpc just to be safe but the logic says a pack with a higher C rating will be delivering more amps when it gets low than a pack with a lower C rating. it makes sense.

If you do the math, An 8200mah 30C pack that has been run down to %20 capacity now has 1600 (approx) mah remaining. 1.6X 30 = 48amps... thats what the math says.
A 5000mah 50C pack that has been run down to %20 has 1000mah remaining. 1 X 50 = 50. So yes, the 50c pack at %20 remaining is capable of delivering more amps.

What would be ideal would be an 8200mah 50C pack. Then, IT would be putting out more amps than the 5000mah 50C pack at %20 capacity.

When i bought my boat i asked tom what packs would be better to run. my 5000mah 50C's or my 8200mah 30C's. He said the 5000mah packs would be better as they would be capable of putting out more amps as the pack drained. I didnt question him, I just did it.

My packs currently temp at around 120 degrees at the end of a full, non stop run. Thats the outer plastic of the hard case so I'm sure the cells inside are a bit warmer.

[Brushless55]

Tom says the packs he sells have been tested and proven to deliver a minimum of 50C... whereas MANY other companies packs DONT deliver their actual C rating. Im AM saying that yes.

However, what I'm NOT saying is what you wrote about the 8200's. Keep in mind, those packs are SPC's as well. What he said is that a 30c pack that is down to 1600mah is not putting out as many amps as a 50C pack that is down to 1000mah. I don't run my packs below 3.6vpc just to be safe but the logic says a pack with a higher C rating will be delivering more amps when it gets low than a pack with a lower C rating. it makes sense.
If you do the math, An 8200mah 30C pack that has been run down to %20 capacity now has 1600 (approx) mah remaining. 1.6X 30 = 48amps... thats what the math says.
A 5000mah 50C pack that has been run down to %20 has 1000mah remaining. 1 X 50 = 50. So yes, the 50c pack at %20 remaining is capable of delivering more amps. What would be ideal would be an 8200mah 50C pack. Then, IT would be putting out more amps than the 5000mah 50C pack at %20 capacity.

When i bought my boat i asked tom what packs would be better to run. my 5000mah 50C's or my 8200mah 30C's. He said the 5000mah packs would be better as they would be capable of putting out more amps as the pack drained. I didnt question him, I just did it.

My packs currently temp at around 120 degrees at the end of a full, non stop run. Thats the outer plastic of the hard case so I'm sure the cells inside are a bit warmer.

first off, I quoted what you said about what that moron said
his logic that he has you believing is 100% WRONG!
his math is dead wrong..
if you run a lipo that can only put out 50a, you will jack them up!!
and IMO the 8200's would be the better pack as you will have about 50% more runtime

and again, most packs will heat up if ran beyond there 80% capacity
if your not doing this and they are getting hot, then that tells me they are not true 50c packs
I have 40c Turnigy packs in my P-Spec that the motor pulls 80a cont and they only get about 105* after a race.. so what does that tell you?

and by the way, 3.6v per cell is not a safe range, that's about 100% empty...

[pavmentsurfer]

Well, this thread jumped into territory I'm not comfortable with pretty fast. The math I'm using to determine how many amps the pack is putting out is not MINE or TOMS... its the math everyone uses to calculate amps. So I can't really see how that can be WRONG. MAH/1000 X C = amps. Its the math that everyone uses. But no big deal.

I don't appreciate you suggesting a person I know and trust is a "moron". There is NO need for name calling or insults here. Maybe its acceptable on this forum. Its not what I'm used to and Id prefer it be kept out of this thread.

Finally, you can say what you want about the packs I'm running. They are tested and proven to be 50C, if not higher. Im very happy with them. From my understanding of how amps and lipos work, it makes sense to me and ill be sticking with the logic. Run times aren't the most important factor to me. But I'm new to boats. So clearly I don't know anything about RC electronics right.

For the record, 3.4 volts per cell is empty. at 3.6 volts per cell I'm putting about 4000mah back into my 5000mah packs when I charge. By my calculations, thats %20 remaining.

[Brushless55]

......

[Brushless55]

Im not sure that 60 amp ESC rating is entirely correct. If I'm getting 2 50C batteries really warm after a run its obviously pulling a heck of alot more than 60 amps. Ive got a Turnigy 120amp ESC to go into this boat. I bought it mostly for the adjustable LVC... but I was thinking maybe it would also be more robust.

I got my battery information from the guy who actually sells the SPC packs that I run. Tom from SPC. His answer was that when the 8200mah pack is full then yes, your amp ratings are correct. However, when the battery is being drained and there is less MAH in the pack, your amp ratings drop as well .

At the end of a run you may be pushing that pack too hard. Whereas a 50C rated pack can still deliver the amps when its empty because it is a true 50C... it sounded like good logic
and Tom has never steered me wrong. He has an SV27 and runs it pretty hard. He also has thousands of dollars in data logging equipment and battery testing equipment. So, I trust that he knows his stuff.

UHHHH???
so he Tom says that the 50c he sells can deliver what he says the packs can and others don't?
so he is saying that the 8200mah 30c (240A)pack when they are down to 1500mah only deliver 60amps but his 50c remain the same
not good logic at all, actually bull really...

and what temp is warm with your packs?
90*F
100*F
???*F
packs can get to about 140*F without harm
most packs heat up good when they go beyond 80% use
if you have 20% and greater left in the packs after a run and they are hot, then they are not true 50c to begin with..

Tom says the packs he sells have been tested and proven to deliver a minimum of 50C... whereas MANY other companies packs DONT deliver their actual C rating. Im AM saying that yes.

However, what I'm NOT saying is what you wrote about the 8200's. Keep in mind, those packs are SPC's as well. What he said is that a 30c pack that is down to 1600mah is not putting out as many amps as a 50C pack that is down to 1000mah. I don't run my packs below 3.6vpc just to be safe but the logic says a pack with a higher C rating will be delivering more amps when it gets low than a pack with a lower C rating. it makes sense.

If you do the math, An 8200mah 30C pack that has been run down to %20 capacity now has 1600 (approx) mah remaining. 1.6X 30 = 48amps... thats what the math says.
A 5000mah 50C pack that has been run down to %20 has 1000mah remaining. 1 X 50 = 50. So yes, the 50c pack at %20 remaining is capable of delivering more amps.
100% WRONG!

What would be ideal would be an 8200mah 50C pack. Then, IT would be putting out more amps than the 5000mah 50C pack at %20 capacity.

When i bought my boat i asked tom what packs would be better to run. my 5000mah 50C's or my 8200mah 30C's. He said the 5000mah packs would be better as they would be capable of putting out more amps as the pack drained. I didnt question him, I just did it.

My packs currently temp at around 120 degrees at the end of a full, non stop run. Thats the outer plastic of the hard case so I'm sure the cells inside are a bit warmer.

first off, I quoted what you said about what that moron said
his logic that he has you believing is 100% WRONG!
his math is dead wrong..
if you run a lipo that can only put out 50a, you will jack them up!! stupid logic for sure..
and IMO the 8200's would be the better pack as you will have about 50% more runtime

and again, most packs will heat up if ran beyond there 80% capacity
if your not doing this and they are getting hot, then that tells me they are not true 50c packs
I have 40c Turnigy packs in my P-Spec that the motor pulls 80a cont and they only get about 105* after a race.. so what does that tell you?

and by the way, 3.6v per cell is not a safe range, that's about 100% empty...

Well, this thread jumped into territory I'm not comfortable with pretty fast. The math I'm using to determine how many amps the pack is putting out is not MINE or TOMS... its the math everyone uses to calculate amps.
No one on these forums uses this bogus logic when the pack is being used up!
So I can't really see how that can be WRONG. MAH/1000 X C = amps. Its the math that everyone uses. But no big deal.

I don't appreciate you suggesting a person I know and trust is a "moron". There is NO need for name calling or insults here. Maybe its acceptable on this forum. Its not what I'm used to and Id prefer it be kept out of this thread.
Ok so the guy is a used car sales man or something?? using bogus logic to sell you his packs and to over look some other packs that could be a better choice..

Finally, you can say what you want about the packs I'm running. They are tested and proven to be 50C, if not higher. Im very happy with them. From my understanding of how amps and lipos work, it makes sense to me and ill be sticking with the logic. Run times aren't the most important factor to me. But I'm new to boats. So clearly I don't know anything about RC electronics right.
LOL

For the record, 3.4 volts per cell is empty. at 3.6 volts per cell I'm putting about 4000mah back into my 5000mah packs when I charge. By my calculations, thats %20 remaining.

most pack are about done at 3.6v per cell.. you might have about 10% left in the packs
all my packs when they are at about 3.7v per cell I am putting back the 80% used back into them
had to quote all this tom given logic for you that is bogus

[siberianhusky]

IF you batteries are getting hot AND they are "50c" packs then either there is something wrong with the boat (don't think so because it runs) or the batteries are junk.
You are drawing amp spikes of not much over 100 amps and average of 60-70 most likely.
My other spec cat see spikes of about 110 and an average of about 75. It's a butt load faster than my MC!
A quality 25c 5000mah pack can run this without overheating the packs. In fact I have run this setup with a pair of 25c 5000mah Enerland packs with no heat problems at all. Not ideal but very,very possible. I have the eagletree data available.
Since nothing has gone up in smoke I'd have to say your packs are no good because they don't seem to be able to deliver 100 amps without heat issues.
Or you are running them down too far.
I completely agree with the 3.7v number, thats my baseline as well. With my Crew thats about 4 minutes hard non stop running with a 5000mah setup, resting voltage before I charge is always 3.7x V. Also works out to an approximate amp draw of 60 amps.

[Brushless55]

IF you batteries are getting hot AND they are "50c" packs then either there is something wrong with the boat (don't think so because it runs) or the batteries are junk.
You are drawing amp spikes of not much over 100 amps and average of 60-70 most likely.
My other spec cat see spikes of about 110 and an average of about 75. It's a butt load faster than my MC!
A quality 25c 5000mah pack can run this without overheating the packs. In fact I have run this setup with a pair of 25c 5000mah Enerland packs with no heat problems at all. Not ideal but very,very possible. I have the eagletree data available.
Since nothing has gone up in smoke I'd have to say your packs are no good because they don't seem to be able to deliver 100 amps without heat issues.
Or you are running them down too far.
I completely agree with the 3.7v number, thats my baseline as well. With my Crew thats about 4 minutes hard non stop running with a 5000mah setup, resting voltage before I charge is always 3.7x V. Also works out to an approximate amp draw of 60 amps.

sounds about right..