RE: Irvine 53 Prop Sizes
You will find this type of feedback on proping your irvine 53.. What you need to know is that the manual calls for those type of props in the UK because of noise pollution laws,,the props like 11-9 11-10 etc give off less noise..This is true info... so what i have done is prop for the kind of flying im doing and the type plane AND WEIGHT.. Pattern style plane, i use the 11/5 for 3d type flying the 12/4 is good,, hope this helps...