Hey , I am using 2 astro flight reversing harbor master esc . one on each engine . I had thought about boosting the power , but she runs good on 12 volts . I may juice it up a bit on my other donzi with the 40's . Oh check out this site . Look at the 55 viking . sells for around $14,000.00 . Captiansmodels.com I tried to get the guy to sell me a hull and deck but he would not do it !