Warbird Information Exchange

I'm curious what are the advantages/disadvantages of electric direct drive VS electric inertia drive starters? I'm mainly interested in radial applications but would like to hear any insight anyone might have.

Thanks

If you have a low battery, a Inertia starter will usually spin up enough to start the engine, most also have the ability to be would up by means of a crank, so no battery is needed, and they sound like a radial engine starter should sound.

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Matt Gunsch, A&P, IA, Warbird maint and restorations
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Does anyone know what the weight differences is between the 2 are ?