Glad you think so!

Yeah, I failed to do the check there. I'm planning on doing another video that includes the effect of momentum conservation.

@@PostcardProfessor Please make it sooner.

Wow

Never knew id find u here

A waste of cyper space big unessesery gaps leonardo wagon goes by ship at sea design 500 + years old oil discovery embedded It 1919 for slush fund to elect polices.obviously the 100 + year politics old scam in play still just .barely.

Say please consider betz totally fake focus on 1905; Einstines relativity kinetics has blue print to stop cold global warming as well as props losing most of winds and tides values in propelling ships to in 1 rpm my design of equal and opposite reactions is able to be enclosed threw cylinders for over majority of cycle or more 6 times opening and releasing either way far more usable kinetic energy thanks if sketch helps let me know or KZfaq bejesus windmills or automatic feathering flat blade radial windmills drawimgs bigger than hover dams that reverce in tides and winds need creditability lacking in sciance thanks I am just inventor way under Einstine

I haven't tried it, but I guess when the radius (r) changes, the gamma angle also changes. Hence the Moment (M prime) is also changing. So the total moment turns out to be 485.3 kNm. How the gamma angle changes is shown in the video.

1. Betz limit and efficiency of wind turbine 2. TSR and effect on Cp cdn.intechopen.com/pdfs/16242/InTechWind_turbines_theory_the_betz_equation_and_optimal_rotor_tip_speed_ratio.pdf 3. Airfol selection , I use NACA 4 and 6 families, for root you use "fatter" airfol because of strenght airfoiltools.com/airfoil/details?airfoil=naca4412-il 4. Twist angle and distribution(video above just take wind speed on blades as 2/3 of wind speed in front of blades) 5. chord distribution, in Betz theory it is described by this equation(which needs optimatization but it is good for the beginning) c(r)=(16*pi*R)/((9*n*Cl*TSR* sqrt(TSRr squared +4/9)) R radisu of blade r local radius n number of blades TSRr local TSR 6. Material strenght, i dont know on what are you working but best materials are fiber glass and composites of fiber glass Once you define geometry of your blade I recommend building it in solidworks and printing it, than you can create mold and then more blades, or you can create your mold in solidworks as well. I hope i helped you, lets build this turbines and help our planet!

Glad it helped

It's something you choose. One constraint is that you never want your blades to get too close to the speed of sound, so (omega*R should be significantly smaller than that). If you want to dive into the world of electrical generators, there may be some additional constraints there. A final constraint would be from the structure, where you have stresses develop based on the centrifuge effect (omega^2*R). Good luck!

@@PostcardProfessor How can i chose that ? if i know that the speed of the wind (8m/s let's say), the RPM will vary and increase with the increase of the velocity of the wind. i wanna know if there is an equation that relates the 2 together (maybe also in relation with the radius)

@@ing.anthony7097 You can couple the moment of the wind turbine to a model of your generator. If you know that the generator accepts a torque that is dependent on the RPM, then you can calculate the operating point of the system. Alternatively, you can put a brake in the system that will keep the turbine operating at a steady RPM, and use up any excess torque. If you want to determine WHY the RPM is what it is, you need to start looking at the mechanical systems, rather than keeping to the aerodynamic.

@@PostcardProfessor hmmm. so if i am designing a wind turbine with 29m radius and w speed of wind 8m/s... is the RPM of the turbine shaft evident here ?

@@ing.anthony7097 Constraining the tip speed to less than some percentage (say 70%) of the speed of sound gives you a maximum value, but there's not a single clear answer from the information you've given.

I haven't tried it, but I guess when the radius (r) changes, the gamma angle also changes. Hence the Moment (M prime) is also changing. So the total moment turns out to be 485.3 kNm. How the gamma angle changes is shown in the video.

Typically, the exact details of the chord variation are due to structural constraints (how much bending can each section handle). This analysis can only tell you how much power you'll generate once you choose the chord variation.

This is ideal in multiple ways. Probably the most important is the neglect of 3D effects. We assume that the flow for each cross section doesn't change that of the adjacent cross sections, and there is no radial flow (flow along the length of the blade). Mechanical losses are also neglected, but much more easy to add in (if you have the efficiencies of the gearbox, etc.).

Can you explain how to design a axial fan?

Very different, unfortunately. Darrieus wind turbines could probably be designed somewhat similarly (with additional complications), but Savonius would be nearly impossible.

@@PostcardProfessor What is your take on the #Saphonian. Postcard Professor, and also I'd really like to get a response to my VAWT question above. Much appreciation!