Thank you for this thread, now I'm wondering about all of the D/F jet kits that were produced before the advent of gas turbine units. Most of the smaller BVM kits were originally made for D/F and with slight modifications are now turbine kits as well. Since the cost of D/F units are less than the turbine engines, why not have less expensive D/F kits and ARFs converted to turbine to offset the cost. Maybe the reason for the 'not a turbine jet' disclaimer is a 'not resposible for this product' if it is converted to turbine. Personally I have no doubt that the quality of the turbine and ARF jet kits are great, but a little expensive for a flying hobby. The bottom line for me is a little extra work to make the D/F kits stronger is well worth the effort, considering a turbine jet may also be lost to several factors, not just structural and the initial cost of the kit is a consideration. . .