FSX – Republic XF-91A Thunderceptor_v1.01. US Air Force prototype jet fighter in 1949. The feature of the XF-91 Thunderceptor is to have an inverse tapered blade that increases in thickness as it goes outward. This affects stalls and the like, allowing for advantageous landing. This is a native FSX acceleration project. This model reproduced the Curtiss-Wright XLR 27 CW-1 rocket motor which could not be obtained. VC has animation aircraft control. Changes from v1.0: Adjustment of engine output and improvement of flight dynamics.