Ok are you guys ready, Here are the specs for what i need to achieve, Firstly the entire blower assembly will have to fit in a 50mm x 70mm tube, The total diameter of the fan must be less than 50mm, now considering the fact that the motor has a 40mm long shaft, i would like to put two sets of blades on it, with a common shaft turning at the same speed, the idea is to gain some sort of compression. so i was thinking that blade one, being the primary intake blade, should have wider blades with less pitch and the second narrow blades with greater pitch. however the total surface area to pitch ratio of blade 1 must exceed that of blade 2, so that compression occurs.
I have gotten this far, here is the motor I'm gonna buy, http://www.rclines.co.za/index.php?main ... ge&pID=150
The questions I have are : is there a relationship between blade surface area, the pitch of the blade relative to the shaft, and the amount of air it can move.
From what i have read, the closer the blades are together the higher pressure you can gain. and the greater the surface area and pitch the greater amount of air can be moved. are there set formulas for these. or is all just a bit of testing. and lastly if i had a nice bowl of burning sticks being merrily stoked by the above blower, and i placed a piece of screen across it would it be better than if left open, I'm thinking MSR reactor....