The Best 2″ and 2.5″ Propellers Shoot-out

Here is a 2″ and 2.5″ propeller shoot-out for cinewhoops and micro FPV drones. These are common propeller sizes for 1103, 1105, 1106, 1204 motor sizes. Bookmark this page so you don’t miss out on any updates :)

The testing and write-up take a long time to do, if you want to see more content like this, please support the website by using the product links on this page if you decide to make a purchase :) Thank you!

Summary of Results

Not to waste your time, let me tell you right now what the best props are from my testing. My conclusion is based on my own analysis of the data. I have shared the data at the end of the article so feel free to study it and decide for yourself.

Since I am using these props on cinewhoops for smooth cinematic flying (very little acro), my main focus would be on efficiency, followed by power and finally responsiveness.

Apart from thrust, efficiency and response, I also measured noise level (in dB) of each props at 50% and 100% throttle. I think this would be useful information for selecting props because we all want our whoops to be less annoying when flying indoor :)

Umma85 – modified from Beta85X

The Best 2-inch Props for Whoops

My favourite is the Emax Avan 3-blade, which seems to be the best balance between power and efficiency. You should get exceptional flight time with these given the outstanding efficiency advantage for the 50% and 75% throttle range (cruising speed).

For raw power, Gemfan 2035×4 and Gemfan 2036×4 are both great options, with the 2035 being a tiny bit more efficient at the cost of a few grams of thrust, this makes sense because of the lower pitch. However you might want to use bigger motors than 1105 for these. They are heavy props and require more torque to spin effectively, therefore more suited for heavier builds.

My main 2″ rig is the Beta85X (Umm85), which comes with the Emax Avan 4-blade. Surprisingly these props didn’t perform well at all, efficiency is one of the lowest especially at mid throttle. If you change them out for the 3-blade version, you should immediately see improvement in flight time and slight increase in power :)

The Azure 2035×3 is an interesting prop, I didn’t expect it to have such low thrust which is way below average, I had to run the test twice to verify (same result). There is no power at the top end and efficiency isn’t particularly great at mid throttle either. However due to the ultra high RPM, it’s one of the most responsive props in the list, which suggests it might do well on ultra-light builds.

The props with the lowest noise level are the KingKong 1935×5, with only 88.5dB at 100% throttle. But these are very poor performer in my thrust testing, so I do not recommend them. The next options are the Gemfan 2035×4 at 95.5dB, and Avan 4-blade at 97.1dB. The rest are all over 100dB.

Umma95 – modified from  Beta95X

The Best 2.5-inch Props for Whoops

I think the best 2.5″ prop has to be the Azure 2540×3. It’s one of the most efficient props across the whole throttle range offering ultra long flight time, and still producing very respectable power (thrust).

My second favourite would be the Emax Avan 2.5″, this is the absolute powerhouse, delivering the most thrust at full throttle, and yet offers decent efficiency.

I recently built the Umma95 which was modified from the Beta95X. It comes with Gemfan 2540×3, and they are actually excellent props as well. Great balance between power and efficiency. If you are already using these I don’t think you have to switch :)

The HQ T65x3 is in a similar position as the Azure 2035×3 we mentioned earlier It’s a very light prop that doesn’t make much thrust, but it can run at very high RPM and it’s designed to be responsive. It would be great for ultra-light builds like a toothpick, but I wouldn’t use them on a whoop.

The most silent props are the Racerstar 2435×4 with a noise level of 97.9dB at 100% throttle, and Gemfan 2535×4 is pretty quiet too at 97.7dB. The rest are almost all over 100dB.

2“ Whoop Props Overview

Azure 2035X3

Go back to “Summary of Results”.

Go check out the test data.

Emax Avan 2inch 3-blade

Go back to “Summary of Results”.

Go check out the test data.

Emax Avan 2inch 4-blade

Go back to “Summary of Results”.

Go check out the test data.

Gemfan 2023X3

Go back to “Summary of Results”.

Go check out the test data.

Gemfan 2035X4 RotorX

Go back to “Summary of Results”.

Go check out the test data.

Gemfan 2036X4 Hulkie

Go back to “Summary of Results”.

Go check out the test data.

HQ T2X2.5X3

Go back to “Summary of Results”.

Go check out the test data.

HQ T2X2X4

Go back to “Summary of Results”.

Go check out the test data.

KingKong 1935X5

  • Product Page: https://bit.ly/2C6d2J3
  • Max Thurst / Current: 132.57g / 6.05A
  • Noise Level: 74.5dB (50%), 88.5dB (100%)

Go back to “Summary of Results”.

Go check out the test data.

Racerstar 2035X5

  • Product Page: https://bit.ly/2Z2LRI4
  • Max Thurst / Current: 156.84g / 7.13A
  • Noise Level: 77.8dB (50%), 99.5dB (100%)

Go back to “Summary of Results”.

Go check out the test data.


2.5″ Whoop Props Overview

Azure 2540X3

Go back to “Summary of Results”.

Go check out the test data.

Emax Avan 2.5inch

Go back to “Summary of Results”.

Go check out the test data.

Gemfan 2535X4 RotorX

  • Product Page: https://bit.ly/2XQdB2g
  • Max Thurst / Current: 214.00g / 9.56A
  • Noise Level: 77dB (50%), 97.7dB (100%)

Go back to “Summary of Results”.

Go check out the test data.

Gemfan 2540X3

Go back to “Summary of Results”.

Go check out the test data.

HQ T2.5X2.5X3

Go back to “Summary of Results”.

Go check out the test data.

HQ T65X3

Go back to “Summary of Results”.

Go check out the test data.

Racerstar 2435X4

  • Product Page: https://bit.ly/3e1sJyB
  • Max Thurst / Current: 189.35g / 9.55A
  • Noise Level: 75.1dB (50%), 97.9dB (100%)

Go back to “Summary of Results”.

Go check out the test data.

Racerstar 2540X3

Go back to “Summary of Results”.

Go check out the test data.

2inch Thrust Data

I tested all these propellers on BetaFPV 1105 5000KV Motor and 3S (12.4V – 12.5V). All tests are done on BetaFPV 1105 5000KV motors on 3S (12.4V – 12.5V). I tried 4S but the motors was burning hot after running full throttle for more than 20 seconds, and I don’t want to annoy my neighbour so I went with 3S in this testing.

If you prefer to hear motor spinning, here is a video :)

Thrust vs Current vs Efficiency

50% Throttle

 Thrust (g)Current (A)Efficiency (g/w)
Azure 2035x334.871.092.55
Avan 3-blade54.741.592.77
Avan 4-blade51.361.702.41
Gemfan 2023x351.541.492.78
Gemfan 2035x459.301.812.62
Gemfan 2036x460.311.842.63
HQ T2x2x453.101.592.68
HQ T2x2.5x355.451.712.59
KingKong 1935x546.541.612.33
Racerstar 2035x558.931.882.54

75% Throttle

 Thrust (g)Current (A)Efficiency (g/w)
Azure 2035x372.492.672.17
Avan 3-blade107.273.692.36
Avan 4-blade102.523.962.09
Gemfan 2023x3102.823.532.35
Gemfan 2035x4110.974.132.17
Gemfan 2036x4113.324.252.16
HQ T2x2x4104.283.792.23
HQ T2x2.5x3103.114.002.08
KingKong 1935x589.573.592.03
Racerstar 2035x5110.094.232.13

100% Throttle

 Thrust (g)Current (A)Efficiency (g/w)
Azure 2035x3115.764.202.22
Avan 3-blade154.436.401.98
Avan 4-blade151.566.881.80
Gemfan 2023x3149.225.902.06
Gemfan 2035x4162.197.061.88
Gemfan 2036x4163.717.301.84
HQ T2x2x4150.936.771.83
HQ T2x2.5x3153.266.961.80
KingKong 1935x5132.576.051.80
Racerstar 2035x5156.847.131.82

Response (Acceleration and Deceleration)

Steeper = Faster Response

2.5inch Thrust Data

I tested all these propellers on BetaFPV 1105 5000KV Motor and 3S (12.4V – 12.5V). If you prefer to hear motor spinning, here is a video :)

Thrust vs Current vs Efficiency

50% Throttle

 Thrust (g)Current (A)Efficiecy (g/w)
Azure 2540x382.152.013.27
Emax Avan86.692.293.04
Gemfan 2535x493.932.572.94
Gemfan 2540x386.142.233.12
HQ T2.5x2.5x391.692.472.99
HQ T65x350.821.422.87
Racerstar 2435x481.342.562.55
Racerstar 2540x375.901.903.22

75% Throttle

 Thrust (g)Current (A)Efficiecy (g/w)
Azure 2540x3149.184.572.64
Emax Avan159.485.302.45
Gemfan 2535x4164.185.902.26
Gemfan 2540x3156.805.172.48
HQ T2.5x2.5x3162.345.692.33
HQ T65x3107.753.192.71
Racerstar 2435x4143.995.822.01
Racerstar 2540x3140.554.412.59

100% Throttle

 Thrust (g)Current (A)Efficiecy (g/w)
Azure 2540x3211.217.782.23
Emax Avan220.928.872.06
Gemfan 2535x4214.009.561.85
Gemfan 2540x3214.348.772.03
HQ T2.5x2.5x3212.679.381.88
HQ T65x3164.185.472.44
Racerstar 2435x4189.359.551.63
Racerstar 2540x3199.117.652.15

Response (Acceleration and Deceleration)

Steeper curve = Faster Response

5 thoughts on “The Best 2″ and 2.5″ Propellers Shoot-out

  1. Evan Petrie

    Hey Oscar! This is awesome data! Have you tested the gemfan hulkie 2040? It’s a tri-blade I’m using on the umma85 and am wondering how it compares to the emax 2inch tri-blade.

    Reply
  2. Andreas

    This was a really great test and article, thank you!
    Btw i have only flown two of the props on my Transtec Beetle and here is what i thought.
    HQ T2.5×2.5×3 and Gemfan 2540×3. They give a very different feel. The HQs make the quad feel looser and mayby easier to transition between moves but the gemfans makes my quad feel more grippy and locked in like on rails and has faster forward cruising speed (for me). I wonder if that has to do with the prop tips that are bent down on them that gives that grippy feel. Anyway i like the gemfans most but now i am interested in trying the Azures after your review.

    Reply
    1. Oscar Post author

      I think that difference in feels is because of the response time, if you look at the acceleration graph, the Gemfan clearly has faster response than the HQ.
      Might have something to do with the shape of the tip like you said, but it’s hard to guess that without seeing real test data :)

      Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

For prompt technical support, please use our forum IntoFPV.com. I check blog comments weekly.