Do you think that SOME of the rides would let a SMALL FOLDABLE powerchair like this one on? (It can be flipped into manual mode real easily and only weighs 50 lbs.) Or would it still be a no go?
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Power wheelchairs are generally treated for the most part the same as manual wheelchairs. If you are able to switch to a manual wheelchair if needed, they do have manual wheelchairs available at attractions.
Pirates is the only attraction I’m aware of that has pretty much never allowed power devices in line, even though manual wheelchairs can go in line (not including those with separate entrances/lines because their line is not accessible).
There are some others that have instituted restrictions off and on - usually after some incident (looking at you Haunted Mansion and Tower of Terror!)
There are some weight and size restrictions - the size of the wheelchair space is 30 inches wide by 48 inches long, according to the ADA requirements.
My daughter’s manual wheelchair is 26 inches wide and about 42 inches long. (Almost 48 including her backpack).
The armrest height is 28 inches from the ground and the top of the push handles are just a bit over 39 inches tall. (She has a power wheelchair, but we have not brought it to WDW).
She has used all of the wheelchair accessible ride cars with her manual chair with no problem.
The tightest ones are Buzz Lightyear at MK, Magic Carpets at MK; Journey Into Imagination at Epcot, Nemo at Epcot; Triceraptor Spin at AK, Safari at AK; Toy Story Mania at Hollywood Studio.
Length in general is tighter than width, but we have had no problem with her wheelchair fitting. Multiple times the CM at Aladdin’s Magic Carpets thinks it won’t fit, but it does.