Strength of a maple tree branch / limb?

I am trying to find what the strength of a tree limb is to know if I can use it as an engine hoist, It rises at about a 85 degree angle, I would be using another branch off that limb to stop the hoist from falling back to the base of the limb, the weight would be about 5 feet from the base of the limb (limb is about 20-25 feet total to the tips of the final branches of it) and would need to support about 600-700 pounds. This is one of the lower limbs, tree is about 40-50 years old so quite tall. Thanks for any help anyone has!