Depends on the engine, plane, line length and diameter, prop, altitude, fuel mix, compression ratio, weather, at least.

Having laid that on you, in my experience, a NV or AP Wasp .061, on 10% Nitro, 45 ft .008" d lines, APC 5.5x2.5 prop, sea level, moderate weather, can do the pattern on 25 cc of fuel. A TD.049 needs about 40 ccs. Drilled venturis and pressure feed make it anyone's guess.

So far, my Medallion .049 seems to do the pattern OK on 25ccs  on 38' lines.

Hope this helps.

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