Versions: V1 and V2
- This example goes a step beyond the first. If the objective is to match, say, a 40% Carden 540 airplane and some information is known about the wing span, weight, prop size and motor, this example shows how this specific information can be used. The Scaling Wizard, will then autoscale data that required to get the physics right.
- The wing span of the 40% Carden 540 is 118 inches, the weight is near 38 lbs, and the prop diameter is 30 inches. This information was found online, and when this information is compared with the autoscaled results in the first tutorial, it should be clear that the autoscaling can come pretty close with requiring this specific input! But we will use this data nevertheless in this second example.
- Go to the “Scaling – Size/Wgt” page and click on the buttons for span and weight, and enter the known values (see screen grab below).
- Now go to the “Scaling – Propulsion” page, and in the propeller section click on the button to specify the diameter. Enter 29 inches. Leave the propeller weight as zero if you do not have that information. When the weight is left as zero, then the Scaling Wizard will compute it automatically.
- For the motor, power data on motors are not always reliable. If we know the approximate maximum RPM, that is a better figure to use. For this 40% sized airplane with a 29-inch diameter propeller, a value of 5200 RPM is reasonable and is used as shown in the graphic below.
- All of this information above is used to scale the baseline 33% Edge 540 data to produce the 40% scale version like the Carden Edge 540.