Batteries are in the fuselage which helps balance the battery box vell vented temperature after flight app/ 110 degrees well even below 120 suggested for lipo operating temp also the temp outside app 60 degrees which also helps along with the plane only using about 1/2 power for flight. There appears to be no major reason not to use electric for large models as this one is just over 40 lbs and 130" span but I am using 35cc gas engines on the prototype I am building