cooling question ?

[Blackjack-sven]

I am not sure where a good place to put a different pickup on my MM ?

I'd have to say furthest away from the prop on the sponson so that you get the least amount of undisturbed water going in.

[Blackjack-sven]

Some say you can get more punch out of the packs!

Has this been proven? or just guessed?

[Brushless55]

Proven by some racers

They make lipo warmers

[Blackjack-sven]

Proven by some racers

They make lipo warmers

Does this apply to Ni-Mh batteries as well?

[Brushless55]

That's what I want to do on my Mean Machine...
When my MM goes by I can see water comming out of the exit but not like how I had it comming out of my SV27 with an external pickup, not using the rudder pickup..

I am not sure where a good place to put a different pickup on my MM ?

Any cat lovers out there with some good ideas where to mount a better water pickup?

[ozzie-crawl]

i like these they sit flush in the sponsons

[Simon.O.]

Any cat lovers out there with some good ideas where to mount a better water pickup?

Better, best or not.
I run a prop-wash or prop blast pickup on my Cat, Canard, and 2S Rigger.
This keeps my esc cool enough and the motor is is only cooled on the Cat.

Feigao 8S, 2S1P 5000 mAh Zippy Lipo, 432 prop.
o.k the rigger gets a 632 for sprints.

Prop wash pickups are the go for my smaller hulls.

[lrm50]

I belive everything has a opperating temp. Not to cold or hot. To cold more resitance. To hot starting to melt down just like a car has a normal opperating temp. To cold engine works harder due to resistance using more fuel. to hot (overheating) parts start to break down. Lipo batts I noticed reaching their opperating temp the faster my boat got. Cooling plates for batts. My thougt not a good idea, but thats me.

[Flying Scotsman]

OFF TOPIC

Why on earth would you want to warm up your batteries before running them and getting them hotter. Does this not cause more problems?

For LI-PO batteries this is very important. 70F min 90F better. There are many articles on this. Here is one courtesy of Darin Jordan.

To make a long story short... You run them cold, you puff the packs... The charge, discharge, and hold up better at 90-110 degrees than they do at 40-60-degrees... As Joerg pointed out a while back, they deliver optimum power when they are warmer.... something like 120-140 degrees...

We warm ours here, but then it's 40-60 degrees out many days, and we don't want to kill packs.

Also, putting them in the boat at 110-degrees or so gives them a NOTICABLE advantage at the start over someone starting their cold.

In my case, mine always go in at the same temp, so there is a consistency issue at the start as well.

Douggie

[Diegoboy]

Sven, I hope you insulate those bare soldered conections.
also, with the cooling jacket turned on its side, i don't think the top half of the motor is being adequately cooled.

[supafastsupra2]

So your telling me that the internal resistance of the battery won't be the first to warm up??

If you turn on the hot water tap, does the hot water in the lines not heat up right at the tank first??

Electricity moves EXACTLY the same way as water.

Youre trying to tell me that the wires actually carry heat from the batteries to the esc and from the esc to the motor? Lol.

[Blackjack-sven]

Sven, I hope you insulate those bare soldered conections.
also, with the cooling jacket turned on its side, i don't think the top half of the motor is being adequately cooled.

Yes the solder joints will be insulated, and I didn't know that the cooling jacket would cause a problem that way. Thanx for the info Diego.
The boat is not ready to run yet but just looking at those lines makes me think about rearranging them and making it neater.

[Blackjack-sven]

Youre trying to tell me that the wires actually carry heat from the batteries to the esc and from the esc to the motor? Lol.

No but as the hot water moves through the lines, it heats up as it goes along. and since the power starts somewhere in the battery it has to heat up at the connection first at least. 6 cell packs show this concept very well as the first two cells heat up before the last 2 cells. What heats up first is one argument. which heats up first and which is most susceptible to breaking down first are another. I forgot who it was that said it a few posts back but the esc is the most fragile component and therefore should be cooled before the motor. That is completely understandable. The easiest to destroy should be the first and then the next easiest and so forth. I never said that cooling the esc first shouldn't be done first like in your first post. I just said that the first component to start heating up is the battery.

[Diegoboy]

I'd love to have batt cooling plates, maybe ones like the SV27 ESC cooling plates, just bigger?
a seperate pick-up & outlet for sure!

[Brushless55]

i like these they sit flush in the sponsons

That looks cool, where do I pick one up?
and is that placed towards the back on a cat?