That's a kindof subjective question.
Tiller:
I'd estimate 30/40 PTO HP is a good range for a 5' tiller based on mfg. ratings.
BH:
I have found my 4110 (41hp/34hp) entirely adequate for a 6' BH. Chances are you'll break your shear pin long before you run out of HP to turn the cutter, so somewhere in the 30-40 PTO HP range should be plenty.
Disk:
This is a little harder question because you have speed vs. soil type vs. width. Generally speaking, 40 hp (4wd) would be adequate for a 6' disk at a "decent speed" for the soil on my place. (I run a 6.5' disk w/ 41hp).
Now, the faster you want to go, the more HP you'll need to prevent from loading the engine too much at speed. IMO although 50 hp would be better, 40 hp is entirely adequate for a 6' disk (and many people get away with less hp than that.)
Hope this helps.
Tiller:
I'd estimate 30/40 PTO HP is a good range for a 5' tiller based on mfg. ratings.
BH:
I have found my 4110 (41hp/34hp) entirely adequate for a 6' BH. Chances are you'll break your shear pin long before you run out of HP to turn the cutter, so somewhere in the 30-40 PTO HP range should be plenty.
Disk:
This is a little harder question because you have speed vs. soil type vs. width. Generally speaking, 40 hp (4wd) would be adequate for a 6' disk at a "decent speed" for the soil on my place. (I run a 6.5' disk w/ 41hp).
Now, the faster you want to go, the more HP you'll need to prevent from loading the engine too much at speed. IMO although 50 hp would be better, 40 hp is entirely adequate for a 6' disk (and many people get away with less hp than that.)
Hope this helps.