Size of cylinder.
Here is what you need to consider.
Weight of the prop. Any leverage advantage or for that matter disadvantage. Most pneumatic props are working with a disadvantage. IE the end movement of the prop is greater than the throw of the cylinder.
So lets say your prop weighs 5 lbs and the mechanical movement is 4 to 1. So if your cylinder moves 4 inches, your prop moves 16 inches. This is a basic calculation and likely the more experienced will correct me, but I would think that with pressure of 100 PSI, to lift this prop you would need a cylinder with a piston diameter of approx 1/2 inch in diameter. A cylinder with a 1/2 inch piston has on the non-rod side an area of rounded off .19 cubic inches. So if you apply 100 PSI to this area, you will provide 19 lbs of pressure. Likely this would not lift the prop though, because of friction and loss.
Hopefully this will give you an idea on how to compute your needs. It is not the distance of travel that you need to look at, other than how it relates to the distance you want your prop to move. Again this factors in. If you change the lever point to increase the movement per the distance of throw, then you will need to increase the size of the piston.
Hope this helps.
Here is what you need to consider.
Weight of the prop. Any leverage advantage or for that matter disadvantage. Most pneumatic props are working with a disadvantage. IE the end movement of the prop is greater than the throw of the cylinder.
So lets say your prop weighs 5 lbs and the mechanical movement is 4 to 1. So if your cylinder moves 4 inches, your prop moves 16 inches. This is a basic calculation and likely the more experienced will correct me, but I would think that with pressure of 100 PSI, to lift this prop you would need a cylinder with a piston diameter of approx 1/2 inch in diameter. A cylinder with a 1/2 inch piston has on the non-rod side an area of rounded off .19 cubic inches. So if you apply 100 PSI to this area, you will provide 19 lbs of pressure. Likely this would not lift the prop though, because of friction and loss.
Hopefully this will give you an idea on how to compute your needs. It is not the distance of travel that you need to look at, other than how it relates to the distance you want your prop to move. Again this factors in. If you change the lever point to increase the movement per the distance of throw, then you will need to increase the size of the piston.
Hope this helps.
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