aluminum or copper coils

Aluminum has about 2x the conductivity of copper for a given weight... but it also has about 1.6 times the cross sectional area; and a slightly larger expansion coefficient...

For a given motor a larger copper coil can be fitted which will handle significantly more power and yeild greater BL... the downside is weight but we all know that 1W/1m @ 1kHz sensitivity dosen't necassarilly mean anything ( and extra mass isn't necassarilly a bad thing )

That said Kyle quite obviously nailed the advantages of aluminum...

 
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