Hi all, I am in the process of making a hand crank blower for my wood/charcoal forge which is approximately 600mm diameter and 300mm high. i have worked out a gear train setup that would give a ratio of about 1:20 using old bike parts. I have seen 2 blower wheels on Ebay, a 88mm for $8 or a 180mm for $30. As i am trying to do this as cheaply as possible, the 88mm seems pretty good for price. Roughly how well would the smaller wheel work if i could get it to 1000-2000 rpm? Ebay link removed