Just saw Graupner's Su-31 in model shop.

[link=http://www.shop.graupner.de/webapp/commerce/command/ProductDisplay?prrfnbr=281987&prmenbr=1081&lang=en]Graupner Su-31[/link]

They are recommending OS 46LA or "4-stroke motor of around 11,5ccm"

I was thinking of Magnum FS 61 AR, I can get it for very good pricing.

Would this be enough ? Or step up to Magnum 80 FS AR ?
Price difference is minimal but 80 is 200 grams heavier.

Any help appreciated.