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  #1  
Old 01-18-2020, 11:41 AM
Tsabean Tsabean is offline
 
Join Date: Oct 2014
Location: Nova Scotia
Posts: 29
Default Battery Contactor Orientation

Any reason a battery contactor can't be mounted upside down? RV8 aft mounted battery configuration on OP10 appears to show it inverted.

Thanks, Tom
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  #2  
Old 01-18-2020, 12:24 PM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Default

Gravity. Potential for G loads disconnecting it. Also is why starter solenoid is the opposite orientation. So the older & wiser folks told me back when,,,
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Time to slow down the Builder Assist operation & concentrate on finishing my own stuff & fly the 6A.
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  #3  
Old 01-18-2020, 12:30 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Contactor

I saw an article where someone calculated the G loading that would be required to disconnect a contactor...you are likely to have other, more serious issues, before that contactor will disconnect due to G loading...
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RV-10
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  #4  
Old 01-18-2020, 01:25 PM
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rv8ch rv8ch is offline
 
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Default no worries

Quote:
Originally Posted by rocketman1988 View Post
I saw an article where someone calculated the G loading that would be required to disconnect a contactor...you are likely to have other, more serious issues, before that contactor will disconnect due to G loading...
I agree. It seems the battery contactor orientation requirement has been debunked as an OWT. Mount it any way that you like.
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  #5  
Old 01-18-2020, 01:29 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
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Quote:
Originally Posted by rocketman1988 View Post
I saw an article where someone calculated the G loading that would be required to disconnect a contactor...you are likely to have other, more serious issues, before that contactor will disconnect due to G loading...
Unless the spring becomes weak.

The EAA electrical class that I just attended said mounting the contractor sideways would mitigate any problem with inadvertent activation due to G loading.
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Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
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Started on QB fuselage 01/2018
Donated for 2019 and so should you
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  #6  
Old 01-18-2020, 02:14 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default So

So where do you draw the line?

Pull enough G’s and other, more important parts, will fail, too...

Point is, in normal circumstances, orientation of that contactor is likely a non issue...
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Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues+ Paid 2019,...Thanks DR+
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  #7  
Old 01-18-2020, 02:49 PM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 168
Default

I couldn't find data for the Cole-Hersee (Littelfuse) 24115 Solenoid.

However, the White-Rodgers equivalent of the 24115 indicated that it shouldn't exceed 5G's Horizontal or Vertical...

I would mount as you wish; I think the 10 & 14 mounts them on the "bias" now..

Cheers!
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Retired Firmware Guy and Airplane Builder

2018 RV-7 QB -- Built, Flying
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  #8  
Old 01-18-2020, 03:29 PM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by mfleming View Post
Unless the spring becomes weak.
.
The contactor is not held closed by a spring. In fact, the spring works to push the contactor open. It is pulled and held closed by an electrically generated, magnetic field, opposing the spring pressure.

Larry
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Last edited by lr172 : 01-18-2020 at 03:32 PM.
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  #9  
Old 01-18-2020, 05:19 PM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
Posts: 637
Default

Somebody contract ‘MythBusters’ to to debunk it. They can try blowing it up
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Ralph
Time to slow down the Builder Assist operation & concentrate on finishing my own stuff & fly the 6A.
My 'retirement' activities list;
Mon - 6 build project to finish
Tues - 6 upgrade project, canopy, panel, interior & fairings
Wed - 9A salvage rebuild, wing, firewall, gear, engine
Thurs - 7 salvage rebuild (was second plane I built, the Turbo Subie) for a buddy
Rest of week - belongs to the wife!
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