The confusion between choosing 2-blade and 3-blade prop for a quadcopter is a tricky one. This is one of the most talked-about topics in the drone community. Everyone has their part to say about this, but the question still remains unanswered.
So which one’s better, 2-blade vs 3-blade prop quadcopter?
2-blade propellers are good for racing. They’re fast and efficient. On the other hand, 3-blade propellers are stable and easy to manoeuvre. You can go slightly higher with them. They’re great for videography. They both excel in their own fields.
Well, this is just the surface level stuff. If you wanna get into the details, scroll down and read the whole article.
2-Blade Vs 3-Blade: Key Differences
Before we get into the details, let’s look at a quick comparison between the two propellers. This might help you in case you’re in a hurry.
|Slightly harder to manoeuvre||Easy to manoeuvre|
|Normally maximum height reach||More maximum height reach|
|Normal thrust power||More thrust power|
|Less likely to get damaged in a crash||More likely to get damaged in a crash|
2-Blade Vs 3-Blade: Detailed Comparison
You’ve already seen the key differences. But that might not be enough for you to be able to decide. Now let’s look at these differences in detail so you know your pick-
Speed & Efficiency
When it comes to quadcopters, the fewer the number of blades, the more mechanically efficient they’re. You’d know this if you’re an expert and know how a quadcopter works. That’s why 2-blade props are more efficient than 3-blade props.
2-blade propellers are slightly longer in length compared to 3-blade propellers. Due to this 2-blade propellers are able to provide more speed.
When it comes to speed, you need a motor that can respond fast. If you use a 2-blade propeller on a motor like this, you’ll get amazing results. Although, you need to check that the thrust power is not too high.
A fast responding motor with high thrust power would work better on a 3 blade propeller.
If you look out for racing quadcopters, you’ll see they always come with 2-blade propellers. They are super light in weight and that’s why the thrust requirement is not high either.
Some of the speed also depends on whether you’re using an inrunner or an outrunner motor.
The durability of quadcopters is quite often overlooked by everyone. The crashing of quadcopters is a very common scenario. That is applicable mostly for people into FPV though.
It’s a wise option for beginner FPV users to start with 2-blade propellers. The reason is, when 3-blade propelled quadcopters crash, the blades will definitely hit the ground. Before the motor hits the ground, the blades will hit first.
Whereas, when it comes to 2-blade propellers, the risk of the blades getting damaged is low. They have a faster motor response and faster speed. So, they are capable of changing the trajectory so that they don’t hit the propellers first.
If the quadcopter doesn’t hit the propeller first, it’ll hit the motor. That’s why you should use good durable motors approved by Roar.
Here’s a list of quadcopters that work best with 2-blade propellers:
Thrust Power & Precision Flying
3-blade propellers provide a quadcopter with more thrust compared to a 2-blade propeller. They can carry more weight. The extra thrust power provides a faster lift. Also, they’re able to go higher than 2-blade propellers.
While 2-blades are more efficient, it doesn’t help in lift. Thrust does. Now, as 2-blade propellers produce less thrust, it takes more time to go up.
3-blade propellers get an extra thrust at the same RPM as 2-blade propellers. And this makes 3-blade propellers go the extra height.
Two blade propellers generate two pressure pulses each revolution. Whereas Three-blade propellers generate three smaller pressure pulses for each revolution.
Due to the number of blades, 3-blade propellers are naturally quieter and smoother at the same time. And the length is also the reason why 3 blade propellers make less noise.
Heavy drones require more power, so they usually come with powerful motors. To utilize the full power of those motors, manufacturers make those drones with 3-blade propellers.
Due to the extra thrust, 3-blade propelled quadcopters tend to be more stable. Making sharp turns is easier with them. You could even get yourself a flysky or a frsky for extra control.
3-blade propelled quadcopters can fly just fine even when they’re not fully balanced. But 2-blade propelled quadcopters can’t. If they’re not perfectly balanced, they vibrate like those old Nokia phones.
We live in an era where we like our products compact and portable. The same applies to the quadcopter industry.
Manufacturers aim to make their quadcopters more and more compact and portable every day. This goal is achievable with 2-blade propelled quadcopters.
3-blade propelled quadcopters need to come with powerful motors to use them efficiently. But people don’t usually own powerful motors. And besides, it’s also more expensive.
Also, 2-blade propellers are faster and more efficient. That’s why people prefer 2-blade propellers.
If you still couldn’t decide what to choose. Here’s our take on this.
If you’re looking for speed and efficiency, then 2-blade propellers are your thing. 2-blade propelled quadcopters are usually lightweight. So, giving you the edge if you plan on racing with them.
3-blade propellers focus on stability and thrust power. These are perfect for videography and plate shots.
Now you know the difference between these two. And hopefully will be able to decide between these propellers.
Question: Does the blade solidity ratio matter for the thrust of a propeller?
Answer: Yes, it matters. You can use the Abbott equation to identify the ratio.
Question: Why are three-blade propelled quadcopters rarer?
Answer: These quadcopters tend to be heavier and costlier. That’s why they’re rarer.
Question: Do you need a license to fly a quadcopter?
Answer: You don’t need one if you’re in the nano or micro category. But a permit is needed for commercial operations.
This is everything there’s to know about 2-blade and 3-blade prop quadcopters. Well, the opinion is yours. You know which one you want.
If you have more questions, let us know in the comments.