One of the engines that TF says use is super tigre 2300. My mind is set I am going with that. I have a super tigre now g40 with a pitts and it is a great engine( it did take me a while to set the needles though , I have picture of it in my gallery ). I have it on a great planes 40 kit corsair. Again the only way I am going to go with a OS is if I can find one for around $150. We have a swap meet here in TN next month I am going to go to it and hopefully someone my have one, if not here I come super tigre!