hey . well i do know some about cats , and a litle about QD engines .. the combo u want is not the most seen arround , but that doesnt mean it not a good one .. , the hull is 44 inch long and the pro serie does have the scale cockpit .. i hope u r sparkplug will be inside ! any way the QD 25 is more than enough power for that hull .. the 25 will give u more revs in the top end , and the 35 cc qd is better mono engine (57 inch ore more) . the drive and rudder hardware is all top quality ,
i would start with the centerline of the prop level with the sponsors , this way u can adjust a bit up and down , we run the prop 1/16 under sponsors ,this way the prop is giving u the best results , very little slip and bite enough for the corners .. the qd 25 is strong enough to spin a 7018 propshop ore a ABC MW 3 prop for heat racing ,and even a modded abc h-50 for saw setup . speed must be more than 55 mph in oval racing and 60 and up in saw ..
spark plug to transom will be arround 13 inch mostly , but call remy for detailed setup tips ! C/G with a QD will be at 31 ore 32 % i think ..
good luck .. and pics will help !
jerome