 Despite the accident , a pre @-@ production batch of ten aircraft was ordered on 27 July 1945 as it was felt that mixed @-@ power aircraft would be of some use easing the transition of pilots from piston @-@ engine fighters to jet @-@ engined ones . At the same time Sukhoi 's Su @-@ 5 was cancelled as it was judged inferior to the I @-@ 250 . 
