I have be in the landcsaping business for almost 20 years and I have never heard of putting two blades on. Until this weekend when I found this site and started reading. This is a great site. So I tried it on my 20 hp Honda Fast Track. I have two sets of gators. It is amazing the airflow from it. It also cuts everything realy small. And it suckes up the grass that lays over from the tires. It does sound like I have an airplane under my deck trying to take off. I hope I don't ruin my lawn mower??