RE: Funtana 90 What engine ???????? help
A Saito 100 only weighs 1.5 oz. more than your OS 91 and will swing the same prop at least 400 RPM more on the same fuel. Mine balances at 7". I highly doubt a Funtana will balance with with an OS 91 without putting your battery up front or adding lead. If you added lead there is no way your plane 8 lbs.