Thanks for filling the performance gains in terms of percentage... It is interesting.
Your cross country times and numbers seem pretty close to what I have experienced. And like you I am happry for the choices we have. I try not to assign values to other folks' flying habits, I have friends that fly C-150's and J-3's, and also friends that fly Kodiaks and Jet Rangers... Everybody's pockets are different, I am thankful I get to fly at all...
I find it fascinating that anyone would consider 'incremental propeller changes' marginal... I don't think the general masses agree, after all, companies like Catto, Prince, MT, etc, etc,,,, all depend on sales. Sales I am guessing driven by people wanting a better prop? Marginal has certainly not been my experience. Not in my play planes, and not in my work planes... In fact in my case it has almost always been a 'game changer' Here are a couple examples;
I was a part of a propeller swap on a Pponk'd C-180 recently. The same engine, plane, pilot, and weather conditions. They were actually flown within 15 minutes of each other. The measurer was a meticulous A&P / IA, who was skeptical that there would be much change. The pilot was a pro pilot, who by nature of his profession logs many, many take offs per day (should have consistency figured out by now...) No short field techniques were used, the plane was simply trimmed neutral and allowed to fly off on it's own. Both props could be coaxed into leaving the ground sooner, this technique was simply used to minimize the potential for human error...
The second prop tested, left the ground 157' sooner than the first.
I agree, that for the average person flying off a mile long paved airport, this is not a game changer. For those of us that routinely load our wives, dogs, and fishing gear in the airplanes and head to 500' - 700' sand bars for the morning, calling this a 'game changer' would be an understatement.
My work plane recently received a new prop. It is a 500 gallon plane, and at a typical muni airport it really is a 500 gallon airplane. Unfortunately, my home strip is short, and during my normal work hours the prevailing wind generally sets me up for a tail-winded departure for several hours. In these conditions this has typically turned my 500 gallon airplane into a 400 gallon airplane... It just wouldn't haul any more.
The recent prop change, was so dramatic (and the original prop was the original TC'd prop) that the airplane has now become a true 500 gallon airplane at home
But wait... it gets weirder.. They are the same props (except as you may have figured by now the new one is 4" longer). That's not the weird part... the weird part is the new longer prop is faster
at every fwd power setting.
Prop math looks
easy... My opinion is that if it really were
easy, ther would no longer be advancements in propellors... heck everyone would just build the best profile / length / etc... and call it good.
Take care, Rob