Wing Loading and Pitch Speed

[Lucke]

Hi RCgroupers !

I like to know about what is the best wing loading for electric Sport and Trainers Parkflyers.

And I like to know too about the Pitch Speed, what is this ? How can I calculate it ?

Thanks for all help !

Lucke

[BMatthews]

Light is best. Keep everything as light as you can while still having enough strength. Light wing loadings not only land slower but they can fly faster as well, if they are a clean design with low drag, as they don't make as much drag to lift the model. The weight of the motor and battery packs will ensure that it's not too light.

For pitch speed you take the pitch rating and multiply by the RPMs of the engine or motor. That gives you the airplane speed in inches per minute. From there use conversoins to figure out the speed in mph or kph. Typcially a model will fly from 60-90% of that max possible speed in level flight depending on how much drag the model has. But you need to allow for the RPMs going up during flight. That's not always easy to figure out.

[adam_one]

Hi RCgroupers !

I like to know about what is the best wing loading for electric Sport and Trainers Parkflyers.

And I like to know too about the Pitch Speed, what is this ? How can I calculate it ?

Thanks for all help !

Lucke
The problem is that the wing loading alone won't tell you much unless you also know the plane's actual size.
For instance, the wing loading of a full scale Cessna 152 is about 167oz/sq.ft (510g/sq.dm), a model aircraft with such a wing loading would hardly be able to fly.
So, the smaller the aircraft is the lower the wing loading should be.

However, a figure that is not dependent on the aircraft size is the Cubic Wing Loading, which is calculated dividing the weight by the wing area raised to power of 1.5
A beginner is advised to choose a cubic wing loading equal or lower than 8, since it will give low take-off and landing speeds regardless of the actual plane's size.
You may calculate your aircraft's cubic wing loading here (http://adamone.rchomepage.com/calc_cubicload.htm)
And to calculate the pitch speed click here (http://adamone.rchomepage.com/calc_speed.htm)

[Lucke]

Thanks BMathews,

Now I understand about the Pitch Speed and Wing Loading...


Wow Adam !

Thanks for the information ! this links will help a lot !

Thanks for all !

Lucke