: Rob (& other magnet hatch builders):

: How much force does it take to open those magnet-fastened hatches?
: (The 'pull' of the magnet pair will be less than the published spec
: because of the veneer and glass/epoxy in between?)

: I'm thinking about a day hatch cover - I want it to be waterproof,
: but I need to be able to open it with one hand, and somewhat
: behind my back....
: So, for an 8" or so cover, how many magnet pairs would I need?
: (Using the 3/4 x 1/8 epoxy coated magnets we were discussing)

: I'd appreciate comments, to guide my experiments.....

: ;-)

Hi John

There's a bunch of pictures and notes in my Guillemot build log,
http://www.farback.ca/index.php?option=com_content&view=article&id=19&Itemid=31
that might be helpfull.

A firm tug on the webbing loop breaks the hatch free. This picture shows 7 pounds on the underside not popping the hatch loose with the lip seal installed.

Kirk