Propeller Slip

[@sushantdhiman4483]

Fantastic video. Correlation of screw with propeller was very well explained.

[@727AC]

This is a simply great video. This really demystifies the difference between blade angle and blade pitch!

[@DeJONbomb21]

great video! super simple and very easy to understand! thank you! I recommended this video to all my mates who study this :)

[@malpayashyras.1393]

Thank you very much for this video! It's very easy to understand. This helped me a lot in my Aircraft Propeller class especially because we are having online classes instead of face-to-face so it was hard for me to understand this topic but your video helped so much!

[@RoddyMcNamee]

@shyra Malpaya thank you for that, I'm glad it is of some use. Best of luck with the rest of your studies.

[@orestism4118]

Perfect Video on propeller Geometric and Effective Pitch! If you are reading PoF from Bristol books it's chapter 18. Really helpful!

[@Michallote]

Hey any clue on where to acquire this book

[@orestism4118]

There are many different online shops, Google "Principles of Flight, Bristol"

[@christopherjames8633]

What’s the difference between experimental mean pitch and geometric pitch ?

[@gopikrishnanmenon5035]

What will the angle of advance be with the aircraft stationary but propellers running?

[@RoddyMcNamee]

@@gopikrishnanmenon5035 The angle of advance will be zero, which if you think about it makes sense as the aircraft won't have advanced.

[@t_c5266]

If I was given motor power, and desired diameter, how would I optimize a new propeller design to maximize amount of airflow?

[@RoddyMcNamee]

Mass flow of air = density x area of prop disc x velocity. If for a given altitude the density and area of the disc (based on prop diameter) are fixed, then the only thing left to vary is velocity. The velocity can be considered as the sum of aircraft velocity and inflow factor. The inflow factor depends on the prop efficiency. So, to maximize the mass flow of air trough the prop, the prop should be operated at the optimum angle of attack (where lift to drag is a max) to maximize efficiency and inflow factor.

[@t_c5266]

@@RoddyMcNamee thanks!

[@sayedsaid4026]

Excellent explanation 👌

[@akbarshoed]

Well done! Timeless classic!

[@eemtech1606]

In your video "Propeller Static Thrust Equation" you mentioned that the efficiency of a propeller is around 85%, do in many your videos about Froude's momentum, you mentioned that the efficiency is around that number. My question is, what is the relation between efficiency and that slip, which its unit also percentage?

[@RoddyMcNamee]

Have a look at this video, it shows slip, the advance ratio and efficiency. kzbin.info/www/bejne/rafKh4Sfopt2b5Ysi=0Yu2css9pCWa-Tru

[@eemtech1606]

@@RoddyMcNamee Thank you for the link, I now understand it.

[@ok_sal]

thank you got my props exam tomorrow! :D

[@RoddyMcNamee]

Good luck.

[@mcinstrumental2961]

thanks

[@abhilashm6711]

Great teacher

[@abhilashm6711]

Sir ,but how to find pitch angle if we are gonna design new propeller and we have only the diameter of propeller?!!!

[@RoddyMcNamee]

@Roaring Aero you'll need more information than the diameter. You'll need to know the cruise speed of the aircraft and the cruise RPM.

[@abhilashm6711]

@@RoddyMcNamee sir can you give your WhatsApp or mail id or skype id,? Please?

[@aviator_himanshu520]

Thank u so much sir