What are the benefits of a dual triple blade prop vs a dual blade prop on a small aircraft?

Answer 1

Well, those are nice, but here are the facts.
Adding blades doesnt increase performance by much at all ts about 6% per blade. the main purpose of adding blades is to quiet an aircraft down, and decrease p factor.
The only thing that affects performance by much is the length of the prop. A 60" prop with 65 hp produces 265lbs of static thrust, the same engine with a 72" prop creates an amazing 420lbs of thrust, thats 60% additional thrust.
That partially explains why the cessna 150 with its 100hp o200 engine only goes 100mph, but other o200 equiped planes have clocked 250mph with stock engines.

Answer 2

So if you assume that the aircraft weighs the same, each Engine (I'm using it to mean motor, as well as props) has to pull the same amount of weight.

That being said, it's obvious that the propellers are what's doing the pulling (by shoving air past themselves). So therefore, for a tri-prop, the motor will effectively feel 50% more resistance from the air, because there is an extra propeller.

Basically this means for the same given RPM, the three-prop engine has to have more torque than the two prop (unless the tri-prop is made smaller). But the benefit is that the tri-prop can have a lower operating RPM than the two-prop because more blades pass the same spot in the air per given rev.

But ofcourse, this all depends on the propeller size and angle of attack.

Answer 3

I'm assuming "DUAL" triple blade was a typo. (6 blades altogether?!!).

Dogg has it just about right. Aerodynamics favors the 2 blade prop, but practical considerations like ground clearance, noise, etc lead the way to 3 blades. Also, 3 blades will be heavier for the same operating conditions, and weight is an incredibly important factor.

Answer 4

Dogg got it pretty good...
Take a look some small homebuilt helicopters. In effect they are turning a very large propeller at relatively slow speed. But due to the efficiency of the longer slower turning blade...it's able to lift a 450lb helicopter and a 200lb pilot.
Generally more blades will quieten a aircraft and increase ground clearance....(very important when considering prop damage from gravel etc)

Answer 5

a dual triple blade prop doesnt have to spin as fast to move the aircraft so it is more efficient

Answer 6

Dual triple blades will add life to your engine, because it doesn't have to work as hard to keep you in the air. At cruise altitude uses a lower rpm settings. At lower atlitudes gives you more torque.

Answer 7

Same diff as Gillette's triple blade vs. twin blade. Get it?

Answer 8

The more blades a prop has the quieter it is.

Answer 9

Less vibration