Say it ain't so, PLEASE! Atomik Stupidity!

[Brushless55]

We all know how the Spartan started out, motors and esc's burning up. Before they hit the stores I predicted that their original system would melt down and I was right. I'm not right about everything, hell, I'm wrong a lot! Lets see how this stuff plays out.

Max Amps also states that you will get 26 minutes run time in a Spartan with these 6500 cells in series for 14.8v nominal. I think that's maxing out at 35 amps for 24 minutes by some quick math in my head but, again, I can be wrong.

to run those packs for 24min to the 20% rule means, that boat is only pulling 12amps
man that sucker must really fly with 178watts

[NativePaul]

So I am seeing it this way. Naviga rules have weight limits as I knew already so, add weight with coolers to your already setup boat that may be at max weight already, therefore you have to trim weight somewhere else...

Does anyone else see this as tail chasing? I'm not trying to be rude or condescending but, give and take is the quandary. Where do you take weight away from, cells, motor, hull, hardware?? I'm sure it's only a few grams or it could be more depending on the design.

What is in there anyway, just an aluminum plate or a copper plate or a water filling type like the ones hobby king sells?

Naviga do have some maximum boat weights for the smaller speed and steering classes, but they are not endurance events so battery cooling will be of no use to them.

I was thinking of the oval and Eco classes, none of which have maximum boat weight limits, the maximum weight limits we have for these classes are just for the battery, (Mini=110g, Mono/Hydro1 and Eco=280g, Mono/Hydro2=560g) including anything fixed to them ie wires, heat shrink, connectors, velcro etc. By having separate cooling plates plumbed into the boat that freely slide in and out of the cells they are part of the boat and are not included in the battery weight.

It should not be possible to save the weight of the cooling plates as the motor, hull, and hardware should already be as light as is practical to do their jobs reliably. As the boat will be heavier with the plates you will need to discharge the LiPos deeper to get the extra power needed overcome the increased wetted area, there will be a threshhold where you are swapping the acceleration and nimbleness of a light boat for the rough water capability of a heavier boat but maintaining the same speed, and I suspect if it allows you to reliably get any more power out of the cells than that it will be an advantage.

The coolers I saw were aluminium alloy or brass plates, with a tube soldered, glued or one piece machined in/on to one or both sides, they have to be quite thin to fit between the cells in a standard battery, I would guess they were between .75-1mm thick, If you wanted to use a water in a cavity type cooler (which would be more effective for cooling), not only would you have to rebuild all your batteries with enough slack in the tabs to fit the thicker coolers in but you would have to design new hulls with space to fit the thicker batteries in.

[ray schrauwen]

They state 32+ mph.....

to run those packs for 24min to the 20% rule means, that boat is only pulling 12amps
man that sucker must really fly with 178watts

Paul, thanks for educating me. Sorry I was a bit un-read on the Naviga classes you were referring to.

[Spartanator]

Say it ain't so, PLEASE! Atomik Stupidity!

Can't I just make the lipo be a ride pad??? Lol

Haha, 26 minutes in a Spartan... Maybe 26-20=6!

[ray schrauwen]

I thought of doing that once...