The issue of "gross" verses "net" hp has surfaced. This is a new one to me. First, let's be clear that we are NOT talking about PTO HP, which is a measure of how much HP is available at the PTO after the rest of the tractor has siphoned off what powered it comsumes.
This started with the observation that, although one might expect the B2910 to have 29HP, is has 30HP. But the fine print says "gross HP", which in itself isn't too odd until you look at the literature for the L3010, 3410, 3710, and 4310. In the book they quote both Gross and Net HP (along with PTO HP). The Net HP corresponds to the tractor model number i.e. 30HP for the L3010, on up to 43HP for the L4310. The gross HP for each machine hovers around 10% higher than the net.
So what the heck is the difference between gross and net HP?