Republic XP-69
... that development of the Republic XP-69 aircraft was canceled due to problems with its liquid-cooled radial engine?
... that development of the <b id="mwAqI"><a href="./Republic_XP-69" id="mwAqM" rel="mw:WikiLink" title="Republic XP-69">Republic <span about="#mwt52" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"XP-69"}},"i":0}}]}' id="mwAqQ" typeof="mw:Transclusion">XP-69</span></a></b> aircraft was canceled due to problems with its <a href="./Radiator_(engine_cooling)" id="mwAqU" rel="mw:WikiLink" title="Radiator (engine cooling)">liquid-cooled</a> <a href="./Radial_engine" id="mwAqY" rel="mw:WikiLink" title="Radial engine">radial engine</a>?