Recent content by reebrah

Well, given i need to find out mass flow or velocity, how can i convert the propellor power delivered, propellor efficiency, diameter/radius, or air efficiency to provide me with mass or velocity flow?

The parameters I have in mind are a 80cm diameter fan, with a high efficiency of 0.9, given a power of 40kW. How can I accurately model thrust given this type of set up?

Okay to make it more clear, let's say vertical lift fan held in place at sea level. Given the parameters listed is it possible to calculate on paper the force of thrust provided by the fan?

Hello, How is it possible to calculate the static thrust from a fan given power, radius, air density, and propellor efficiency? I've did some research and found various equations that all gave me varying results. Does anyone know what the real static thrust equation is? Thanks...

No i am just trying to find an accurate way to model power consumed given an amount of thrust and radius of fan. Are their any other factors i should be worried about?

there's also another eq. I've found on wikipedia which replaces the eta^2 with a constant of four. How can i confirm this is correct? Also you are right about the thrust units.

I think that might just solve my problem lolz

True but in this equation the eta^2 is replaced with a 4. This would then further decrease the power estimated from this relation. Anybody else know anything for hovering thrust?

Basically I am doing work that requires me to calculate power for given thrust of a fan which is hovering. Variables known: diameter of fan: 0.8m, thrust output of fan: 250kg, rho=1.1455 kg/m^3 which is the density of air at 35Celcius , and eta which is the fan efficiency = 0.8 I...

Homework Statement basically I am doing work that requires me to calculate power for given thrust of a fan which is hovering. Homework Equations We are given the diameter: 0.8m, thrust output of fan: 250kg, rho=1.1455 kg/m^3, and eta which is the fan efficiency = 0.8 The Attempt...