I am fixing to start building a Goldberg Extra 300 It will be lightned to the max without compromising the strength of the structure. I have a foam wing kit for it that will be cored a set of carbon fiber gear glass cowl and pants and maybe a carbon fiber spinner. Ok heres my question I dont want to cut my cowl all up so I want to run a inverted 4-stroke (I dont mind cutting the bottom of the cowl). I want the plane to have unlimited verticle i'm not into 3-D just your normal airbatics and some Imac. I dont want the plane to be under powered and I dont want it to be way over powered. I also want to run a 3-blade prop for the scale look (I know the 3-blade is not as efficent as a 2-blade but that dont bother me) I'd like to hear some suggestions on engine prop combos.

Saito 150 (180 guzzles too much fuel and there's not much room for a 24 oz tank in this plane), YS 120/140.

Keep the plane under 10lbs and any of the above engines will give you unlimited vertical.

Thank's for the reply LuvBipes.... anyone else care to add any other suggestions.

THE SAITO 150 IS A POWERHOUSE IF MONEY IS NO OBJECT I WOULD GO WITH IT . I DONT HAVE ONE BUT HAVE HEARD GOOD THINGS ABOUT THE 150.

With YS 120 you need to put ele & rud servos in the tail, , as well as the battery, maybe with the new YS 110 you may get some weight advantage; I am sure power will be there!
Also I did reinforce the fire wall and the landing gear fuselage former.
You will get what you are looking for with this combo.