Yes, I too have a H9 P-51d. I have a YS-91FZ and m running an APC 13x8. It flies like a dream. Still breaking in engine, so I have no good tach readings for you. I replaced the stock wire gear with "Spring-Air" 704 retracts and "Lyte-Flyte" oleo struts. The entire air system is mounted on wing, very clean install. No unplugging of air system to remove wing, just unplug the servo wires. It weighs in at 8.4 pnds.