Well, when I had my LAK-17a, I had a make-before-break and I never blew
a fuse.Â* The idea is to flip the switch, not see how slowly you can keep
it in the "make" position.Â* I would imagine the "make" time is of the
order of no more than a couple of thousandths of a second.Â* Some body
with a scope could measure that time and let us know.

On 4/5/2020 10:10 AM, wrote:
On Sunday, April 5, 2020 at 10:18:00 AM UTC-5, Dan Marotta wrote:
Wouldn't a make-before-break switch solve the problem in a much simpler
fashion?Â* That's what my Stemme uses and switching between main and tail
batteries is a non event.

Depends on what happens between make and break.

There will be some amount of surge current from the full battery to the empty one. If the current times the time exceeds the fuse IT, you can blow a battery fuse.

Long wires out to the tail and quick switching could make this less likely.

--
Dan, 5J