Just have a couple questions re;the P90.Have a very hagard swap meet special that I am trying to get in the air.Only larger engine I have is a OS 90 Surpass which happens to bolt into the motor mounts it looks awfully small up there.Also have a Lazy ace 73" if there is such a thing anyway supposed to be one.It had a Saito 180 so need to find an engine that will work in both of these and I don';t think the 90 OS is it.Just replaced it in my astro-hog with a OS 61FX like getting a new plane sure lot more power.Anyway can anyone tell me the balance point.Have humg everypiece of scrap iron I can find in the shop on the firewall and still seems tail heavy.Need heavy engine!Will that OS 90 get it in the air?See the adds say 90-120 4 stroke.It had a twin from the cutout on the cowl but no sign of how they mounted it as the present mount is low on the firewall no where near the hole in the front of the cowl?Getting m,ore enthused with it as get it a little patched up and will probably look for one of the mid sized Saitos120-180.Your comments will be appreciatted.Bob Moodie