A switch-jack, simply put, is an ON switch, OFF switch and CHARGING jack for your plane... all in one neat CLEAN 4-5 gram set up.
Over at California Sailplanes.com has an excellent step by step photo how-to page, go there to check it out!... but these photos will give you an idea how clean an install this is!
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For how to solder the actual switch and jack as well as where to purchase the parts go to Hollyday.com
NOTE: Since Hollyday no longer sells these parts or makes the jacks I would advise you to download a
copy of the instructions... I do not know how much longer this link will exist...
To buy QUALITY parts go to Mouser Electronics. I DO NOT advise using the Radio Shack stuff.
STD (5 amp?) set-up:
Jack: Mouser part # 502-765
Plug: Mouser part # 502-712A
Micro set-up: I do not use the micro set-up any more. The type of plug used was never intended to carry supply voltage and is constructed in a way that could potentially fail although I never had a problem with them. The STD size plug is only fractions larger and weighs like 1 gram more - so use the STD one.