John Slade wrote:

So, if we have a difference of around 50 lb [lighter for the 13B], does this
mean I should mount the 13B aft of the plans point for the Lyc to keep the
airplane C of G in the same place?

Well, that depends on whether you have a pusher configuration or a tractor
configuration, and also on where the datum point is.  Less weight = need to be
further from the datum point.  I think generally this means further forward for a
tractor and further aft for a pusher.

DISCLAIMER: I haven't read all of the weekend's email yet, so this may have
already been covered.

Russell Kent

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