I will be happy to take you to lunch when you are in RI and I am in
airport vicinity. I will even pay for the drink if you can answer the
following simple question. For 100 points and the jackpot... ;-)

An RV-10 has a span of about 32 ft, wing area of 148 sqft and a wing
loading of 18.6 lb/sqft. It cruises at around 190mph
(optimistically). It's stall speed is 57mph.

Let's presume its wings were telescopic---which of course they are not.
Let's presume that fully extended they are still what they are. Now
presume in full flight, I could take off 1/3 of the wing. For your 100
points, how does the expected stall and cruise speeds change? [For
extra credit, assume a reasonable weight increase. hmmm...how much
does an empty aluminum wing structure weigh? I guess this could even
be fabric---it would be used only during landing.]

regards,

/ivo