I know that static thrust is best when using a low pitch, large diameter prop. In this case, I am planning a 18x6 prop.
if you go to the "Tach Reading Page" you will see many people posting what their Saito 180 turns for RPM,
for what you said I agree for the most part, that is when comparing 2 props of a given brand and type, such as an APC 17X8 to an APC 18X6. but what you will find is that a good quality Wood prop pulls much harder than a Plastic prop of the same size. for example>, my Magnum 180 4St turns a Xoar 17X6 at 8600 RPM, and an APC 17X8w Sport turns 8800 (both on 15% Magnum fuel) so I suggest on your Saito for you to run a prop in these sizes with 20% Nitro or less (APC 17X8w, or a 17X6 good quality wood prop), I'm betting if you run an APC 18X6 with 15% you will turn around 8200. so with that if you want to run an 18 inch prop you will most likely have to use less pitch than 6" unless you burn more Nitro. don't get me wrong, if you wish to run at a lower RPM, then please do so, many people do, and engines run smooth and constant when loaded like that, they just work a little harder
see the Tach Reading page here,
Tachometer Readings - RCU Forums
Jim
Last edited by the Wasp; 05-25-2017 at 09:59 PM.