Looking for a buggy project - Page 12 - RC-Monster Forums

02.01.2007, 02:06 AM

yeh lol same here, but idk... good to hear u found a new way to mount it..

and also what is wrong with the 80 b? its cheaper (which i like lol) would it get to hot or what?

nativepaul · 02.01.2007, 12:09 PM

Don't be too tempted to make a metal enclosure for Lipos, they come in soft polly pouches for safety reasons first not weight.

My dad was an electrical safety tester, responsible for giving out BS kite marks for the UK, one of the things came with AA size lithium cells, and in his effort to find dangers he put the 2 cells in a standard home nicad charger, and left them on an ovenight charge, he put the charger in a thin steel locker the type we have in schools and placed a screwdriver through the holes where the padlock would go.

On return in the morning he found the screw driver, stuck over 2 inches into a brick wall from where the door blew off and schrapnel from the bits of cell had blasted through the locker (creating more schrapnel) and bits of the metal cell cases and locker where all over the bunker, floor, ceiling, walls, the lot.

Its like gunpowder, you can put an ounce of powder on a plate and burn it in your hand but if you put it in a pipe and seal the ends, you have a bomb.

Theres videos of lipo fires and while they go up well and start fires, if your outside and one goes up 20ft away your prety safe, but stick one in a metal case and I wouldnt want to get within 100yds.

I think from memory those cells where 3.7v and 1200mah I cant imagine the destructive power of a 4s 8000 pack in a metal enclosure. Just dont Do it.

02.01.2007, 12:56 PM

lol terrorists!! the po po shows up, we had a bunch of calls that ur lighting off bombs!! no no just my batteris for my toys:018:

BrianG · 02.01.2007, 02:12 PM

Well, it wasn't going to be sealed, just mostly enclosed to help prevent punctures during a crash. I wonder what material the liposack is made of? It would be interesting to see if they could make battery wraps. That way, your cells are always in a sack. Of course they'll still vent if a problem occurs, but it would help mitigate the effects.

As to why I didn't go with the 80B; I wanted at least 100A minimum. Those current ratings listed are at 25 degrees C. But, we all know that running BL on a hot summer day can greatly exceed that and those FETs derate the current ratings. So, even though I won't be running at 100A, it'll be right where I want after derating.

neweuser · 02.01.2007, 02:20 PM

Quote:

Originally Posted by BrianG

Well, it wasn't going to be sealed, just mostly enclosed to help prevent punctures during a crash. I wonder what material the liposack is made of? It would be interesting to see if they could make battery wraps. That way, your cells are always in a sack. Of course they'll still vent if a problem occurs, but it would help mitigate the effects.

As to why I didn't go with the 80B; I wanted at least 100A minimum. Those current ratings listed are at 25 degrees C. But, we all know that running BL on a hot summer day can greatly exceed that and those FETs derate the current ratings. So, even though I won't be running at 100A, it'll be right where I want after derating.

I like confort level in my esc's too. On 5s, my 12020 runs a lot cooler than the 9920. My quark also runs cooler on 4s than 5s as well.

02.01.2007, 03:22 PM

yeh i want the same feeling, but im asking lol
but can we get some updated pics?

BrianG · 02.01.2007, 03:34 PM

This might be done by the end of the weekend, so you'll have pics then. Right now, I'm using Legos to simulate the ESC mount for fitment purposes so it looks a little funny. :)

And yes, the Legos are mine. I find that I can easily make mockups of many things before building it for real.

neweuser · 02.01.2007, 03:36 PM

Sounds good Brian. Whenever you are ready. I bet the legos would fly with some lipo and esc with bl though!

BrianG · 02.01.2007, 03:50 PM

Quote:

Originally Posted by neweuser

Sounds good Brian. Whenever you are ready. I bet the legos would fly with some lipo and esc with bl though!

Yeah, and fly apart with the first crash! :) And just to clarify; I just use Legos to simulate certain parts, mainly for fitment - not the whole buggy.

neweuser · 02.01.2007, 03:54 PM

Quote:

Originally Posted by BrianG

Yeah, and fly apart with the first crash! :) And just to clarify; I just use Legos to simulate certain parts, mainly for fitment - not the whole buggy.

I figured that mcuh, but I know how much you like to take things apart and put them back together! LOL:005:

glassdoctor · 02.02.2007, 12:42 AM

Now we know why it took so long to get the buggy done.. you spend all your time playing with legos, lol.

I use cardboard to mock up stuff sometimes. Anyone want a pretend 4s 6000mah pack? It kinda looks like the real thing... hee hee

BrianG · 02.02.2007, 02:39 AM

Quote:

Originally Posted by glassdoctor

Now we know why it took so long to get the buggy done.. you spend all your time playing with legos, lol.

Awww man! You caught me! :dft001: We all have to have our toys! ;)

I've used cardboard too, but Legos are easier and faster to make stuff. Plus, you can make small adjustments without having to build from scratch. I actually have my Lego bins near my workshop area. :)

Lol, E-MAXX Rock's. Patience! I did make some headway tonight though. Made the receiver mount, replaced the gasket in the diff, made and thermal epoxied the heatsink for the Quark, figured out how I'm gonna have the ESC mount set up, and figured out the wire routing. Not bad for one night.

neweuser · 02.02.2007, 10:02 AM

Quote:

Originally Posted by BrianG

Awww man! You caught me! :dft001: We all have to have our toys! ;)

I've used cardboard too, but Legos are easier and faster to make stuff. Plus, you can make small adjustments without having to build from scratch. I actually have my Lego bins near my workshop area. :)

Lol, E-MAXX Rock's. Patience! I did make some headway tonight though. Made the receiver mount, replaced the gasket in the diff, made and thermal epoxied the heatsink for the Quark, figured out how I'm gonna have the ESC mount set up, and figured out the wire routing. Not bad for one night.

That is pretty good progress Brian. So you thermal epoxied the heat right to the quark? Or did you put it in the case of the quark?
Can't wait to see the completed project!

BrianG · 02.02.2007, 11:09 AM

I only epoxied heatsinks to the external case. I'll wait until the warranty runs out before I do any improvements to the ESC internals.

I can't wait to see the completed project as well! :)

neweuser · 02.02.2007, 11:17 AM

Quote:

Originally Posted by BrianG

I only epoxied heatsinks to the external case. I'll wait until the warranty runs out before I do any improvements to the ESC internals.

I can't wait to see the completed project as well! :)

Brian, if I may ask. I thermal epoxied my fan mount wings to the bottom of my rear custom heat sink. Now, when do this, the epoxy did not seem to be AS strong where you would not be able to remove the object after it dried. Stronger than the paste yes, and yes it dried hard, but my question is..."how hard would it be to remove the esc from the epoxy?"
The reason I ask is because I would love to epoxy my Quark to my rear heatsink. But if it's harder than hell to remove in case of damage, then I may not want to. But it seems that it may not be. If I could epoxy with some effort to remove it, then I would definately do this instead of zipties...