OK - Just putting in my 2 cents...

Torque Roll is caused by an equal and opposite reaction of the rotating propellor, right? Right.
How can you create the same thrust while reducing the torque? Use a propellor that is more efficient for the specific use.
They have several different diameter and pitch propellors for a reason.
Many people fly their planes in many different manners, one being hovering.
The most efficient pitch to hover with is a lower pitch and higher disk area, (diameter), than one used for high-speed flight.

A 17x4W is a wide blade prop. I used a 14x4W to load up my .65LA where I needed the ground clearance, and a 14x4 let the engine run a little high for my liking.
This is a power prop, and has a lot more engine load due to its WIDE blade. It has a higer rotational drag than a normal width blade.

You see, a larger diameter will have a greater static thrust using the same pitch because of the disk area that is covered when the propellor spins. Double the diameter and increase the disk area by 3 times.
Why is this important? The pressure differential can be less while producing the same thrust. The engine can spin slower and perform the same amount of work, (Dick, the watts consumed WILL be the same producing the same amount of thrust, but torque will change).


You can imaging the pitch as "shifting gears" in your car.
If you start in 1st gear, you will have lots of accelleration, but your top speed is limited. If you start off in third gear, you will have a good top speed, but your acceleration will be poor. This can translate roughly to your propellor pitch. A low pitch like x4 will have greater static pull than an equivalent loaded prop with a higher ptich like x8, (I use the term "equivalent loaded prop" because you need to decrease the diameter when you increase the pitch to obtain the same load).

Dick, with all due respect, you were measuring watts to thrust, not watts to torque, or thrust to torque. The question that was asked had to do with reducing torque while maintaining thrust, not changing power to change thrust. Please don't confuse the problem with a non issue.
You were measuring the efficiency of the prop, not the torque required to spin the prop.

Powerlines,

In simple terms, try a standard width blade 16x4. This will produce the same thrust for hovering while spinning at a higher rpm, but at a lower rotational force, or torque, because of reduced drag of the smaller prop blade.
If the engine revs to high, go up an inch in diameter while keeping the same pitch, (if they make such an animal).

Let us know how you make out.

Bob