KB8L Testing

[SJFE]

HiModel GX Seires 200A 3-7S Brushless Electric Speed Controller Type GX-200A-OPTO http://www.himodel.com/electric/HiMo...200A-OPTO.html

I really just give up.

[eboat]

I really just give up.

......... :)

[SJFE]

......... :)

What exactly are you trying to say?

[RCprince]

we gotta share the love folks

[SJFE]

I agree and do. But out of respect for Steven not with links to other stores in the open forum.

[RCprince]

I agree with the respect issue, But if it was an item that Steve sold I would never post the link no matter what the cost...That I think is respect...But I understand so I won't post link anymore.

[SJFE]

I got the cooling installed on the new esc tonight. As you can see the fets are to close and plated between the boards are impossible. Cooling will have to be done from the top.The first setup I built was with a monstrus thermaltake 12v heat sink fan over copper plate with the mhz cooling block & brass tubing. I bonded it all together with non conductive heat transfering thermal epoxy. It's a great fit and would cool a v8 chevy. problem is it weighs about a half a pound. I opted for another piece of plate with the ose cooling plates and a smaller 7.2v fan. This takes up much less space. Not to mention is a bit lighter.

[SJFE]

This is the monster cooler I built. I used the same epoxy on this one. It's really great stuff but very expensive.

[eboat]

There is three layers in that esc
Does each layer make heat or just the components on the top layer ?

[SJFE]

Each layer is stacked with fets. The bottom 2 have thermal tape connecting the tops of the fets to the bottom of the board above. I'm not thrilled about the layout but at least the heat will be transfered up to the cooling. I'm not planning on much heat anyway. I'm guessing this setup will pull about 120 to 130 amps constant. With a 200 amp esc that leaves alot of headroom. I will see tomorrow.

[SJFE]

Gearing up

We are going testing @ 11:00. I have the setup pic here. I have no free bec or lvc so Im tx packing it with a stop watch. I ran out of 5.5's AGAIN so I can't run the dpr today. That's 25 sets of 5.5s in 6 weeks. The power up test was good. No low end cogging like the hex units. Very smooth and it..um...really turned up with a 3/4 throttle burst. WOW. Packs are on the charger and the camera battery is getting charged up also. I'm only going to have temps, speeds & battery drain data this time around. By next weekend I'll have the dpr, bec & lvc wired in. I'm not afriad to admit I'm feeling some nerves after that power up.
Wish me luck

[eboat]

I will check back later to see how things went

[Flying Scotsman]

A very clean setup Tom . I trust all goes well. Let us know...props...amps...temperature..etc.

Douggie

[SJFE]

Not so good guys

Well fellas this ones my fault. I had thought I covered everything but I was mistaken. I didnt run the pressure test on the cooling system. It goes to show it don't matter how much you know or how long you have been doing this. Costly mistakes are easy to make. All I did was forget to put a single peice of silicone tubing around the end of the 4mm tubing over the first esc cooling plate inlet. The leak was so small I didnt see any water upon the first inspection. I mistook the power down for a week tx pack. I must have bumped the line when I took temps. On the next run water pourd into the esc blowing it. I was lucky the hull didnt get scorched. It does stink pretty bad. I cleaned it out, removed the floatation and hit it with the kirby. The pool nodel I had up in the bow is outside airing out. As you see in the clip the esc is a complete loss. I will double and triple check the cooling system next time. When it ran I noticed no more speed than with the last power system. Proping down just kept the temps down. The x637 made the boat loose. If I had kept with a 40mm prop speed whould have been up quite a bit. I'm out of the water for a while now. I'll order a new esc @ the end of the week if they remain in stock. You can see the damage in the clip.

Check twice buy once!

[txboatpilot]

Son of a B*&ch!! That sucks, it looked like it was running so well..

I take it you did not waterproof the esc when you disassembled it for the cooling upgrade?

Before you had the problem, did the esc work nice and smooth?