Tweet
I should mention too. The Bling Rocket beats up on both of these on the water with UL power. It's more stable at right around the same speed. Trouble is, you can't buy one off the shelf ready to rip.
-
Noisy person -
ts davis
i was looking at running 2 4s packs in parallel and i was curious if the 2 4s packs in parallel at 40c would be any different as 2 2s 50c in series
so are you saying the proboat needs alot of screwing with to get running good and the aquacraft is good out of the boxComment
-
Probably not fair to ProBoat to make such a blanket statement. I know guys have good luck with the boat. Let's say that was the case with the examples we had on our pond. Manufacturing discrepancies, water type, traffic, wind direction patterns on our particular pond. Lots of factors to take into count for why we saw that with our guys.
Still come down to mah on the packs. You could get 2 huge 2s packs. Say 2s/6600's and series those. If you parallelled 4s/3300's you end up with the same thing. Both are reasonable approaches. You "should" be able to get 4 minutes out of quality 4s/5000 pack as long as you don't go too crazy with big props. 4s/5000's X 2p is unnecessary in either of these boats IMO.Noisy personComment
-
True
I never thought of bigger 2s packs then i dont have to buy a new chargerComment
-
Ok cool
What about the blackjack 29 cat will 4s fit in thereComment
-
Keep in mind 4s with 2s packs in series = the batteries C rating (50c as you noted), The 4s packs in parallel you add the two packs "C" rating together as well as the mAH... so 4s 5000 40c in parallel with another of the same would be a 4s 10,000mAH 80c pack to your ESC :)
Obviously if you run a single 4s pack it is what it is..Comment
-
i never thought about the c rating doubling
is that going to be to much for the escComment
-
You can NEVER have too much amp capacity... EVER :) The problem is you usually don't have enough.. hense poofed packs.
The only spec you need to worry about with an esc is the voltage, if you don't exceed the max voltage you won't have an issues. The battery, even the ESC only gives the motor what it asks for, the higher the C rating the less resistance there will be (normally) and you will have a happy cool setup. If you have too few "C's" for what your motor is demanding or an esc not capable of what the motor is demanding you can again cause issues. Also the "normally" was because if you don't have sound battery connections the plugs can really hinder performance and cause issues even with the best lipo's. Even good bullets if they are even slightly loose in a battery tube (or with each other) will cause arcing and it will eventially mess up or desolder joints. 90% of desolders are from arc'ing (at least from what I've seen over the years).Comment
-
sounds good pal
i have been into the brushless cars for while and never had all these tech stuff needed to know
so in your opinion if you were me and just going out to buy a boat and new batteries what would you run?
2 2s packs or 2 4s packs
what do you think i will be happier withComment
-
On the topic of ESCs:
1) Number of poles.....is that specification the sum of the stators and magnet poles or just the magnet poles? One 'expert' claims it's the sum of both. You can see how confusing this can be when determining the base timing to start with based on manufacturer's recommendation based on pole count.
2) Pulse width modulation. My Seaking 120A doesn't have an adjustment for this. Anyone know what Pulse Width it uses and what's the drawback of not having the proper pulse width? (not to be confused with timing)Comment
-
I was speaking in regards to the battery... but yes load is part of the equation if you look past that and you always want the right equipment for your load. If you over amp most escs of course it will die a early death. If you monitor temps and have sound connections most will still work fine at their max as long as all components are good and resistance is low, but if the esc goes up always opt for a higher amp rating. Keep in mind most ESC issues arise because your lipo's cannot do their jobs and as voltage drops, amps increase to reach the same speeds and if the packs have an issue providing those amps things can go south fast. I'd suggest the hobbywing 120 or 180 amp esc's but I'm sure others are great too. Obviously for smaller boats than what we are talking about lower rated esc's maybe fine.
These are motor questions, but I guess you do want to make sure your esc is capable of running 4,6 or as many poles as your motor has
Read this on another forum a while back.. so I'll give him creds.. poles are the magnet poles, not the slator teeth but as he notes sometimes people do refur to them as poles but normally for a given spec "4-pole motor or 6 pole motor it's a reference to the magnet poles.
In outrunner-type brushless motors, "poles" refer to the number of magnets around the perimeter of the rotating can. "Poles" is also sometimes used as a name for the stator teeth, around which the wires are wound. The number of magnets and the number of stator teeth is always different. Common combinations are 12 magnet poles and 9 stator teeth, 6 magnet poles and 9 stator teeth, and 14 magnet poles and 12 stator teeth.
More poles is not necessarily better than less poles. Equally important are the strength of the magnets, the number of turns of wire on each stator, the pattern of the windings (clockwise on some teeth, counterclockwise on others), and how the stator windings are connected to one another and to the ESC.
- JeffComment
Comment