Alex, 11.5 cfm @ 90 psi won't run a sandblaster. I have trouble imagining that small an electric motor putting out 7 hp too. One of those heavy 5 hp electrics will run a 20 cfm compressor with no problem but you need a fairly small nozzle in the blaster for it to keep up. I have a 7.5 hp electric on a 35 cfm V4 unit that keeps up with no problem, but one of this size is $3000 at Princess Auto.
An 8 or 10 hp gas engine will replace a 5 hp electric motor and should run almost any normal two cylinder compressor.
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