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Old Nov 24, 2014, 11:17 PM
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Mark from Dinogy,

Are you going to be at the AMA Expo this year? If so, which days, and will you have a good variety of battery capacities of various cell counts (4S-6S)? I'll need to check out the booth and buy some batteries.
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Old Nov 25, 2014, 04:08 AM
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Hi Joe

Sorry to read you've flagged it away. Don't worry about returning the money it was a donation to the cause. As far as I'm concerned I have had excellent value.

I don't care too much about exact measurements and if you find batteries that perform well please let us know. I will check the site occasionally.

Regards Stewart
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Old Nov 25, 2014, 04:35 AM
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Quote:
Originally Posted by MCSGUY View Post
I would not go by this, especially on the smaller wire. 20 amp on a 20AWG might act more like a fuse then a conductor (give it a try on a test bench to see what I mean).

Joe
Confusing, since there are allot of different visions on this subject

This I did see from a manufacturer, which is maybe valid in general?

Rob

Ps. I did get my 12AWG cable and for 100amps... nope
Already visual I would say 'nope'. So will order 8AWG for this purpose

http://estconn.en.alibaba.com/produc...AWG_18AWG.html
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Old Nov 25, 2014, 01:44 PM
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14g at 90+ amps

Quote:
Originally Posted by brushless55 View Post
and possibly because our races are over so fast, some less than 90sec at that amp rating that the wire heat may not have much time to really build up

also though during a race I never run 4s1p in the boat I was testing with, I always race with 4s2p so they share the load between the packs
Quote:
Originally Posted by mrforsyth View Post
...and there you have it.

At ~1/2 the current, the power dissipation in the leads will be 1/4 as much as when running a single pack. Consequently, wiring heat build up during a run will be very manageable, and why your leads are staying cool.
Quote:
Originally Posted by brushless55 View Post
when you quote someone be sure to include all wording
because on test day I was running 4s1p
I tested 6 different lipo brands that day, and yes I did see some packs puff as I was running them from 50-60sec WOT and taking out 2500-3000mah
on the Gens they ran right at 60sec and used up 3000mah in that time
For what its worth
also to note I have pushed one of my FE boats during testing over 240amps on 10g wire that is on the speed control...
also some of our spec classes us the UL-1 speed control that has 14g wire and I have seen our boats pull over 90amps constant during a 6 lap heat, and some have gone over 110 amps constant on that same speedo through those little wires
http://www3.towerhobbies.com/cgi-bin...&I=LXVSV4&P=ML
not sure if it matters but the max temp on the wire says 200*C
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Old Nov 25, 2014, 02:55 PM
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Can you get away with it? Very likely, as long as the duration is short, connector solder joints don't reflow and fail, and you're perfectly ok giving up the power losses.

Is this wise practice and something that I would freely recommend for a flight application? No, as the consequences for power failure are far more grave than a land (or water) based application. In my experience, it's generally wiser to be more conservative in an application that is less tolerant of a power system failure, but that's just me....
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Old Nov 25, 2014, 03:52 PM
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There may be a good reason not to, but if you've got 4S2P for races, why not reconfigure, rewind the motor, and use 8S (put the same two lipos in series) to double the voltage and halve the current?
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Old Nov 25, 2014, 09:37 PM
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Originally Posted by AeroKen View Post
There may be a good reason not to, but if you've got 4S2P for races, why not reconfigure, rewind the motor, and use 8S (put the same two lipos in series) to double the voltage and halve the current?
LOL
that would be against the NAMBA rules for P classes
P = 4 cells
N = 2 cells (and those little buggers can actually pull more amps than some P class boats)
Q = 6 cells
T/S = 8 cells I believe

and no reason to rewind a motor when they build plenty of other KVs

I am in the process of building a Cat for 8s racing, and that sucker is going to fly !
it's a much much bigger boat....
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Old Nov 25, 2014, 09:44 PM
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Its called racing

Quote:
Originally Posted by mrforsyth View Post
Can you get away with it? Very likely, as long as the duration is short, connector solder joints don't reflow and fail, and you're perfectly ok giving up the power losses.

Is this wise practice and something that I would freely recommend for a flight application? No, as the consequences for power failure are far more grave than a land (or water) based application. In my experience, it's generally wiser to be more conservative in an application that is less tolerant of a power system failure, but that's just me....
LOL can we get away with it ...... Its called racing
not sure how many of us race across the US but there are many many members in NAMBA who race these setups, if not we would have no races
http://www.namba.com/content/districts.asp
yes we are Nation wide
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Old Nov 25, 2014, 10:16 PM
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Quote:
Originally Posted by brushless55 View Post
LOL
that would be against the NAMBA rules for P classes
P = 4 cells
....
Yup, that would be an excellent reason!
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Old Nov 25, 2014, 10:30 PM
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Quote:
Originally Posted by AeroKen View Post
Yup, that would be an excellent reason!
if you break the rules you do not race

you cannot race 8s in a 4s class
8s boats have their own class for racing... so kinda pointless
P class is 4s only
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Old Today, 01:03 AM
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T-cat
Dinogy Lipos will be at the AMA show all 3 days. I take everything I have In inventory so will have many sizes a available.

Mark
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Old Today, 01:06 AM
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Awesome! I need some 4000mah 4S and maybe 4000mah 5 or 6S as well. I'll check out the booth. Thanks Mark.
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