Now now, come on! I doubt Tony is becoming a millionaire selling his little brass weights!
Ellis has done extensive testing, below and above what he currently uses. So of course this tree doesen't grow into heaven!
When I earlier stated that in onroad a heavier car is faster in the wet, that is of course only to a certain extent. That's common reason! What the limit is will vary depending on conditions, but there will be a "sweet spot".
And yes, all your physical theories are "correct". But you're forgetting that RC racing simply cannot be compared to 1:1 racing. The speed, low weight and power is simply way way too extreme here!
Me and Elvo had a fantastic & VERY long discussion tread on myTSN (Serpent) many years ago. The topic was "fluid dynamics", more commonly known as aerodynamics. I learnt all about Bernoullis theorem, inverted aeroplane wings, diffusers, gurneys, vortexes and so on... which was so much fun & very interesting! But in the end the conclusion was: The speed relative to the scale is so high that more or less none of these principles apply! Firstly we don't have "drag penalty" as we're overpowered. Secondly it's just "pushing air" here and there, plus tons of turbulence! So it's very much down to experimenting!
Keep in mind that also insects don't have "aerofoil" wings. They're just simple & flat, like RC wings. They just showe air around!
(fluid dynamics don't work in such a small scale, as the air molecules are always the same size)
(Yeah, yeah.. the point comes now...)
The same is the truth for weight. Forget your schoolbooks! Go to the track and start testing - with laptimes! If you at a given track and the best setup you can come ut with - are faster with a very light car - nice! Go for it! But try also with more weight - at different places in your chassis!
I'll do whatever is faster! F*** theory! Books have been rewritten throughout history!
And look at F1! They're experimenting all the time! Motorsport is no "given science"! It's trials & errors & crazy stuff all the time! A given setup change may even have different results on different tracks! So TEST, TEST, TEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
That being said, we now see more and more tracks with astro turf. Which means high grip and a fairly flat surface. This caters for lighter cars. My guess is we will also see softer (yet durable) tire compounds in the future (maybe also lower profile). Again, easier to get a light car working well... In my crystal bowl I see OR getting closer to on-road...