I had the Seagull PC9 and I used an OS .46AX with a APC 10x8 prop. With this prop the plane would go vertical unlimited. I know that Phoenix models makes one and Tower Hobbies carries them. I do not have any experience with them, only the Seagull.

One thing to be aware of is mine crashed in a dive due to elevator flutter, so replace the stock clevises with metal ones and make sure the push rods have no play in them. Other than that, the plane is a great flyer.