Myself and my 5', 100 lb., 84 year old Mom! We tilted up two stacks of blocks about 1.5 feet. As shown in the photos above, one stack weighs 205 lbs. plus the carriage, for a total of around 440 pounds. The fulcrum points are on either side of the 4" x 4" Vertical Support. F1 to F2 is 5" to 6". The angled Tilt Assist Arms adds to the overall MA. The Pulley Assembly has two pulleys on each side. Across the top are pulleys to guide the tilt cords and the ratchet gears used to hold the Carriage at its fulcrum positions. Dropping on both sides are fulcrum cable tension weights which takes up slack as the Carriage tilts and holds the cable tight around the ratchet gear take up spool. The drop time is related to the weight driving the gear box which turns the generator. This is a basic setup and it turns the generator at around 100 RPM. I am using a generator from Freedom PMG™ Permanent Magnet Generator. The measured voltage is 11-12 volts.
The required force to tilt is around 30 pounds. The overhaul for one tilt is 5 feet. It should take around 8-9 tilts, with a 11-14 degree tilt, to lift the Carriage one foot. Due to some cable slippage around the ratchet gear drums and the stretching of the cables, it takes 10 to 12 tilts. When you design a Lifter and size it to something that you can handle, keep in mind that it isn't just the force in your arms, the size of your waist line might be a better parameter to base the size of your Lifter.