Thanks all, for the good replies. Now to sum it up. After converting the Homelite 30 cc for all I can get out of her, Do you think it would pull my Sig Sukhoi SU-31 with any authority at all? The plane is coming in at about 9 lbs with everything in it less the engine? What prop combination would be a good try? Also----could anyone give me Frank Bowmans E-mail or web site?? I went thru 9 pages on google before I gave up. Thanks Hooker53