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Author Topic: Grinder power unit  (Read 1240 times)

Offline Leo Mehl

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Grinder power unit
« on: January 20, 2014, 11:05:36 AM »
This is my power unit stuffed into tank compartment of my IC Grinder. Eflight 25 870 kv motor. Viper 4 cell 3200 MAh 14.8 volt battery and arming plug plus too much wiring. I wish they wouild make the ESC with the wiring coming out of one end instead of both ends. HB~> HB~> HB~>
« Last Edit: January 26, 2014, 12:38:08 PM by Leo Mehl »
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Offline Kim Doherty

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Re: Grinder power unit
« Reply #1 on: January 20, 2014, 11:20:48 AM »
Quote from: Leo Mehl on January 20, 2014, 11:05:36 AM
I wish they wouild make the ESC with the wiring coming out of on end instead of both ends. HB~> HB~> HB~>

Leo,

You can remove the shrink wrap, unsolder and reattach the power leads to the ESC so that they are running in any direction you want. Just use a new piece of shrink wrap and you are all set. I do this on my models.

Kim.
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Offline Dean Pappas

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Re: Grinder power unit
« Reply #2 on: January 20, 2014, 08:05:06 PM »
Hi Leo,
Sure enough, tidiness ain't easy in a cramped nose!
Thanks for the opening, actually I've always wished for all the high current wiring to come out one end, and the control cable to come out the other: that would alleviate the interference that sometimes couples into the control cable from the high current side.

Regards,
  Dean P.
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Offline Tim Wescott

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Re: Grinder power unit
« Reply #3 on: January 20, 2014, 08:34:21 PM »
Quote from: Dean Pappas on January 20, 2014, 08:05:06 PM
Hi Leo,
Sure enough, tidiness ain't easy in a cramped nose!
Thanks for the opening, actually I've always wished for all the high current wiring to come out one end, and the control cable to come out the other: that would alleviate the interference that sometimes couples into the control cable from the high current side.

Dean: I'll design a schematic and lay out a board for an ESC if you'll write the software!

I have a Castle ICE (I think that's what it was before I stripped off the heat shrink) here -- it's a double-decker design with all the "low power" stuff about 5mm away from the power deck.  You could unsolder the wires and put them on "backwards", but about all that would spare you would be the proximity of the low-power wires to the high-power ones: the circuitry would still be jammed up close.
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Offline Crist Rigotti

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Re: Grinder power unit
« Reply #4 on: January 20, 2014, 09:02:55 PM »
Shouldn't there be some consideration to airflow in that "engine" compartment?  Being narrow and cramped, I can see where it would be easy to over-temp something.  Cramming in a lot of electric stuff has to lead to problems.....right?
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Offline Paul Walker

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Re: Grinder power unit
« Reply #5 on: January 22, 2014, 07:57:04 PM »
Wow Leo!!!

Where is the battery in there?

Have you checked the ESC's running temp yet?

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Offline Dean Pappas

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Re: Grinder power unit
« Reply #6 on: January 23, 2014, 08:44:55 PM »
Quote from: Tim Wescott on January 20, 2014, 08:34:21 PM
Dean: I'll design a schematic and lay out a board for an ESC if you'll write the software!

I have a Castle ICE (I think that's what it was before I stripped off the heat shrink) here -- it's a double-decker design with all the "low power" stuff about 5mm away from the power deck.  You could unsolder the wires and put them on "backwards", but about all that would spare you would be the proximity of the low-power wires to the high-power ones: the circuitry would still be jammed up close.

hi Tim,
I'm hardware ... Mongo not write code. The last time I wrote code in anger was assembly for a 6800.

Dean
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Offline Dean Pappas

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Re: Grinder power unit
« Reply #7 on: January 23, 2014, 08:50:15 PM »
Yes, Crist.
cooling in this airplane looks like it's gonna' be a problem.
Leo, has this flown yet?
Can you figure a way to get more air to the ESC and battery? Maybe a scoop on top of the nose?
In general, heat is the enemy of motors and ESC's.  Batteries tolerate poor cooling in May, but not in July.

later,
  Dean P.
« Last Edit: January 25, 2014, 04:48:17 PM by Dean Pappas »
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Offline Leo Mehl

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Re: Grinder power unit
« Reply #8 on: January 26, 2014, 12:31:25 PM »
Quote from: Crist Rigotti on January 20, 2014, 09:02:55 PM
Shouldn't there be some consideration to airflow in that "engine" compartment?  Being narrow and cramped, I can see where it would be easy to over-temp something.  Cramming in a lot of electric stuff has to lead to problems.....right?
so far no problems with airflow altho it is winter and everything stays cooler. The vent I have on the nose really helps keep things cool and the battery stays really cool.
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Offline Leo Mehl

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Re: Grinder power unit
« Reply #9 on: January 26, 2014, 12:34:14 PM »
Quote from: Paul Walker on January 22, 2014, 07:57:04 PM
Wow Leo!!!

Where is the battery in there?

Have you checked the ESC's running temp yet?


It's winter and everything stays cool. Good flying Grinder. But it isnt the plane that screws up. I am hoping I can beat someone with this plane but who knows?
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Offline Dean Pappas

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Re: Grinder power unit
« Reply #10 on: January 26, 2014, 08:39:07 PM »
Quote from: Leo Mehl on January 26, 2014, 12:31:25 PM
so far no problems with airflow altho it is winter and everything stays cooler. The vent I have on the nose really helps keep things cool and the battery stays really cool.
Duh-Oh! I didn't notice that top scoop, the first time around. HB~>

take care,
  Dean P.
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Offline Leo Mehl

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Re: Grinder power unit
« Reply #11 on: February 07, 2014, 01:00:02 PM »
Quote from: Paul Walker on January 22, 2014, 07:57:04 PM
Wow Leo!!!

Where is the battery in there?

Have you checked the ESC's running temp yet?


The battery is that black thingy with the gray velcro holding it in. the back of the battery is held by a plywood shelf that alows the battery to be sliped into and it also helps keep the esc cool. So far no problems with this system and all my runs have been consistent. The only changes I have made is I am still running a 12X6 apc prop that is not cut down . I had to put larger wheels on the plane to get clearence. There is a large opening in the front of the cowl and also a large exhaust opening which keeps everything cozy warm but not hot. In other words I can't warm my hands in the winter because the battery is only luke warm and not a sign of high heat.
« Last Edit: February 11, 2014, 02:19:20 PM by Leo Mehl »
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