Hey guys,
The following formula is provided on the wikipedia page for downforce,
D=0.5(WS)*H*alpha*F*rho*V^2
Where:
D is downforce in Newtons
WS is wingspan in metres
H is height in metres
\alpha is angle of attack
F is lift coefficient
rho, ρ, is air density in kg/m³
V is velocity in m/s...
I'm now struggling after checking out both of those wikipedia articles, struggling to find information also because as soon as Wattage is mentioned i get nothing but results for electric fans on google.
Would the calculations be easier if i used a centrifugal brake? to lower the 150kg, 20metres...
Im essentially lowering a 150kg mass 20m to the ground by using the fan to dissipate energy.
The mass will be attached to a rope that is wrapped around a spool.
As the mass descends the rope will be pulled from the spool causing it to rotate. The spool will then drive the fan via a belt.
The...
Hey, I'm trying to find a fan that will dissipate 1471.5W. The fan is going to be driven via a belt connected to a driving spool and not driven by an electric motor.
How do i go about calculating the required fan size?
Is there anywhere i can look at fan specifications for fans that are not...
Could anyone provide me with any equations i would need to use to calculate the size of the fan i will need to lower 150kg and also the diameter of the spool that the rope will be wrapped around?
I read a post on lowering tethered payloads on mjgradziel.com which mentions that a fan of 1m diameter will be sufficient to lower the weight of an average person. DCould you suggest any equations to consider when trying to calculate the required size of the fan?
From the two equations i have calculated the gravitational potential energy that the mass to be descended has. And using P=E/t, have set a time for descent, t. I now have the Power output in J/s. Am i right in saying this is the amount of energy i must dissipate each second for a constant...
I have been tasked to design a controlled descender to be used on a building site to lower tools/rubble to the ground.
I'm trying to design a product like a fan descender like that seen at powerfan.co.uk
Could anyone help me with the theory side of its operation. Obviously it uses the fans...
I am using the tyre friction equation Fc=mu*Fnormal to calculate the downforce required for each corner of the Gilles Villeneuve circuit in Canada.
Fnormal composes of the downforce and weight of the car.
mu has a maximum value of 1.7, however this value will vary from corner to corner right...