The aluminum has more negatives than positives for BL power.
- The blades cannot be sharpened enough and the result is non-optimal performance - prop walk, low efficiency.
- The castings are porous and don't polish or smooth well
- The weak nature of the metal can result in easily-thrown blades - dangerous!
- Aluminum is not without its own health concerns - it is a known neurotoxin. I'd rather have berrylium poisoning (treatable) than alzheimers!
http://www.med.nyu.edu/patientcare/l...hunkIID=164929
http://www.angelfire.com/az/sthursto..._toxicity.html
Bottom line - follow the manufacturer's recommendations.
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