"The reason manufacturers don't make stuff is when they don't perceive them as being commercially viable/profitable." Er, yes, that goes for everything, but perceptions about what is commercially viable change from one year to the next, otherwise there would never be any new models. Who would have thought that Airfix would produce Lego-like Quickbuild models that represent such a move away from its traditional products...anything is possible, that's why we have wish lists. The point about most spinning props looking different due to the number of blades, and / or RPM speed at which they operated is of course true, but maybe that's another reason why the manufacturers should produce them as they could bring their expertise into play. Thank you for posting those instructions, Dogsbody, I built a few Frog kits many years ago (and still own a few now) but I cannot remember seeing the the prop disc in any of them! Thank you too, Ratch, for the image of the Lysander. It's hard to make out the detail of the prop, but is that a kit that you installed an electric motor in?