A tractor capable of lifting at least 2,000 pounds is best for moving round bales of hay. It would probably take a horsepower rating of about 40 or 50.
40 horsepower
About 20 to 40 horsepower
The Scale would be 40 to 1. 20 feet is composed of 40 six inch sections and the scale tractor is one six inch section representing the 20 foot original therefore 1=40
30-35 horsepower stock, up to 40 with mods...
40 horsepower.
The Raptor 660 has about 38 to 40 horsepower in the stock engine. This can be modified to increase the horsepower.
A 4040 has 77 drawbar horsepower and 91 PTO horsepower.
The volume of an engine does not necessarily determine its horsepower. That being said, the average 350 cubic centimeter engine is about 40 horsepower.
40
Rated 40 out of the box
Buy a performance chip. Very simple to install and pretty cheap. Can add 40 horsepower sometimes.