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  #11  
Old 03-27-2017, 01:24 PM
smash smash is offline
 
Join Date: Apr 2013
Location: Fair Oaks,CA
Posts: 35
Default Starter Contacter orientation

I just attended the SportAir class on electrical systems and the instructor advised against orienting the starter motor contactor vertically (as shown in picture below). The g-forces of aerobatics can cause the contactor to close thus engaging the starter uncommanded. He advised to mount it 90 degrees to vertical. How are others mounting their starter contactors?
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  #12  
Old 03-27-2017, 01:44 PM
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
Posts: 1,965
Default starter contactor orientation

This seems to be an "old wives tale" according to Bob:

http://forums.matronics.com/viewtopi...065c2bd53a61d6

Quote:
Originally Posted by bob nuckolls
I have yet to put my hands on any
failure of hardware that supports any notion of risk
due to airframe induced g-loads.
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  #13  
Old 03-27-2017, 01:44 PM
n982sx n982sx is offline
 
Join Date: Apr 2010
Location: Chicago, IL
Posts: 145
Default

Quote:
Originally Posted by smash View Post
The g-forces of aerobatics can cause the contactor to close thus engaging the starter uncommanded. He advised to mount it 90 degrees to vertical. How are others mounting their starter contactors?
First, neither of those are starter contactors. They are both continuous duty contactors, in this case, for ground power and bus cross feed. They are not part of the kit and Van's has no responsibility for them.

Second, for what it's worth, the starter contactor supplied by Van's in the firewall forward kit mounts at about a 45 angle.

I have no knowledge about the efficacy of the SportAir workshop remark.
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  #14  
Old 03-27-2017, 01:56 PM
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Av8rRob Av8rRob is offline
 
Join Date: May 2005
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Default

I also took the sport air workshop with Smash and found it curious that the -14 has its start/master solenoids mounted at the 45 deg. I might have to call Vans to ask their thoughts on the subject.
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