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Motor and Gearbox system for a Trommel

Motor and Gearbox system for a Trommel

(OP)
Hello

I recently got into veg gardening. I have a lot of good soil but it needs to be sieved to remove rocks and other crap from it. I decided to build myself a Trommel based on this article http://www.popularmechanics.com/home/how-to-plans/...
But I decided to make a more robust version of it, everything else stayed the same.

The Drum Weight is 52KG (up to 70KG with Soil inside, that’s about 2 x 12 Liter buckets full)
The length of the drum is 50” (127cm)
The outside diameter is 30” (76cm)
Inside diameter is 28 ½” (72.5cm)
The channel for the belt is 20mm
I would need the drum to spin at about 20 to 25rpm.

Going by this information can someone tell me how to calculate what type of motor I would need and if the rpm were too high how do I reduce it using a gearbox?
Thanks

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