Why would you carry your spare $1500+ engine around in a card board box. Approved F.A.A flight box $220 click link for more info. We use for X-30,PRD,Mini Rok,Comer & many others 12″ L x 8.5″ W x 14″ H Frank 909-456-9264 http://inlandempire.craigslist.org/rvs/4708147533.html