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63 pages, Kindle Edition
Published September 1, 2017
Maximum slope for hand-propelled wheelchair ramps should be 1" of rise to every 12" of length (4.8 degree angle; 8.3% grade). Maximum slope for power chairs should be 1.5" rise to 12" length (7.1 degree angle; 12.5% grade).
International Residential Code (standard code used all over US) requires a 10" minimum tread and a 7-3/4" maximum riser. This would be an angle of approximately 37.8 degrees; 65.5% grade.
Now my physics is pretty damn rusty but according to a formula I found on line the Force to push Mrs. Bennet (est weight 120 lbs) her wheeled chair (estimated weight 40 lbs) up a 65% slope is ... 380 pounds of force. Conversely the strength required to keep her from flying down the slope is 380 pounds of resistance. This isn't a one person job unless the one person is a strong man contestant.