I have a Walko biplane that has a 1610 prop on it and the only complaint I have is that it doesn't want to slow down and is very hard to land smoothly if there's no wind will going to an 18 six help in that department? It's on the 26 mL gas engine.
Make sure power system can handle the prop by: rcdude07
Make sure the power system can handle the prop. If it can, give it a try. But do be aware the more scale a plane is, the less it'll slow down like a trainer.