have to agree with Roland i have flown just cocks for years , but alas no more too many good hens waisted , the N.E.H.U montage for this years U.N.C winners only had 2 cocks and this is in my mind the hotbed for testing strains and sexes so far more hens are winning than cocks in my mind , as stated before ill race then hens first 3 races then ill get cocks out for 4th race and fly whats fit after.