Prop Selection Graphs

The 3 prop selection graphs are truly unique. Once you grasp the concepts, you will find them to be useful tools. The two axes are diameter and pitch. The red lines represent D vs. P for a fixed current. If you think of each intersection of green lines as defining a prop size, you can easily see how much current it should draw. The solid blue lines are boundaries based on best motor efficiency. You can change the range by simply entering a new max value in the AMPS text box. The right-most dashed blue line represents P=D. The other is P=D/2. The X represents your prop selection on the main screen. If you point your mouse cursor near a green-line intersection and click, the X will move to the nearest intersection.

SELECT.gifIf you click the Select button, you will return to the main screen with the prop size specified by the X. Now comes the cool part. If you click the mouse while holding down the Ctrl key, you will create dots that 'snap' to the grid. Ctrl-click a dot to remove it.

LIST.gifIf you click the List button, you will get a list of the performance of all the props you selected! You can print this list, save it in a text file, or sort it by up to three categories.

AMPS.gif This is the current used to construct the graph. On the Current graph shown below, it is the maximum current, and the minimum is half of this. The program makes a guess at this number and you can change it in the text box.


The three prop selection graphs are used in the same manner with a few exceptions. The Gearing graph below has curves representing different gear ratios with the indicated current. It otherwise works the same as the Curent graph.


The Cell Count graph below has curves representing different cell counts with the indicated current. It works similarly to the other two graphs with an important difference. If you click your mouse to move the X, the graph will redraw itself by assuming the nearest integer cell count and recalculating current accordingly.