You can see the base that the BC-611/BC-721 plugs into in the CG-4A Glider between the dual yokes.  It’s at the Air Mobility Museum in Dover Delaware.
 
https://amcmuseum.org/at-the-museum/aircraft/cg-4a/
 
Ray F/KA3EKH

From: [email protected] <[email protected]> on behalf of sbjohnston--- via MRCA <[email protected]>
Sent: Wednesday, October 2, 2024 6:37 PM
To: [email protected] <[email protected]>; MARK DORNEY via MRCA <[email protected]>
Subject: Re: [MRCA] [Milsurplus] BC-611 Operational Question
 

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I have a BC-721 which is the glider version of the BC-611.   It has an 8 pin Jones socket on the side of bottom swing door.  I think the bottom cover is deeper than on the BC-611.  In original use, the socket provides the interconnections to the glider via the mount.  

I've never seen a BC-721 mount, but I've put that socket to good use to feed A and B power in from an external pack of batteries. 


Steve WD8DAS  
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