My First E-Dune Runner

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The batteries should be at my door soon. If I don't have to move the servo tower and radio box then I just need to fab up some battery holders. That shouldn't take too long. Maybe by the end of the long weekend I could get the thing going. But it'll still be a ways off from being track-ready.

I'm still figuring out the heat sink. I've actually read more research that says I need to keep the heat sink thick. So for now I might not do anything and simply try the thermal paste.
 
Oh my! The batteries showed up, when I lifted the box I thought there was a mistake. I was also hoping the mistakenly doubled my order. Nope, the two largest batteries I've ever seen were in there. Combined weight is 5lbs 5ounces. That's 9 ounces heavier than the stock gas motor! So now I know this will be heavier than stock. The batteries are huge!

The good news is I don't have to move the servo tower but the radio box has to go.

Here's a picture comparing 2s 5000 to the 2 x 6s 8000mah batteries:

7890329288_f2fd62ae63_z.webp
 
They are very big.

I'm a little low on ideas on how to mount these. Maybe we can all collaborate and brainstorm about ways to mount these big guys. The obvious way I can think of is mount aluminum angle and box them in but I'm not sure that's the best way. Maybe velcro them to the chassis and just run straps over them. Any ideas are welcomed. I am concerned that they are vulnerable b/c they are soft packs.
 
Those look like a mattress.

I think you would be ok with Velcro as long a they are down in the chassis.
 
I sort of regard these soft packs like an egg. They can handle a decent level of pressure given it's spread out over the area of it but if you put too much pressure in a specific spot they dent.

So a fiction type of mount like velcro could be ideal. But I'm just not sure how yet.

Maybe the velcro is on the chassis bottom mated to the bottom of the battery but that's not enough to hold it in place. If you simply use a typical strap(s) to hold it down you'd certainly dent the cell. But maybe instead of a thin strap you use a very thick one like that is as wide as the pack. Maybe use a piece of fabric (somewhat stretchy) like vinyl to cinch the pack down. This would put enough pressure on the velcro to hold it place while not damaging the pack.

Maybe instead of fabric we use a cut up rubber inner tube. Cut it to the width of the pack and use it to cinch it down. This would also provide friction at the top of the pack to help the velcro (at the bottom) hold it in place.

Sorry for spilling out my thought process but maybe it'll spark a better idea from someone else.
 
I started playing w/ an idea this morning. It's .125" aluminum strips w/ grooves milled into them so they interlock. It'll serve the same purpose as the velcro but tolerate dirt/mud better and not allow the battery to move at all (unlike velcro that has some give to it).
 
This is how I plan on placing the batteries in the chassis:

7897468060_e309f15ca5_z.webp
 
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RCDAD said:
It is great to see that they fit!
Click to expand...
It does amaze me how big this thing is. What's even more amazing is that the 5ive-T is even bigger!! Yet it comes w/ a smaller motor and sub-par parts :( Don't get me started.

Anyway, progress has been made on the battery mounting idea (there has been a change in thought).

[A little background info]

Everyone in my family has crazy mental potential (not applicability but potential :) . So projects (regardless if they are RC, auto, home, business, etc.) go like this. I come up with a great idea (not being arrogant just making a point). I think it's the best idea ever otherwise why would I think of it, lol. I pass it along to my father. He always makes it better in a way I never could have thought of. Then I pass the idea onto my brother. My brother has one of those crazy brains you cannot explain. He takes the idea comes up w/ a new idea that is completely out of left-field NO ONE would of thought of, yet it is better and easier to pull off.

So with that we have our battery mounting concept:

7898029886_b42d8e4619_z.webp

Think of a tootsie-roll except the candy is a battery and the wrapping is an inner tube. Above is one battery stuffed inside a wheel-barrel tube (took about 30 mins). The ends will be clamped down to the chassis w/ aluminum bars. The bottom of the battery-wrapped tube will be industrial velcro fixed to chassis velcro.

This provides significant holding pressure that is equally distributed throughout the surface area of the battery. Well that's the theory anyway. Only track time will tell.
 
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