Now we are stocking more and more of the DAL props range, I thought it was about time to outline their slightly cryptic way of naming them. Time to separate the T from the TJ and the BN from the BS!
Let's start with the numbers in case you don't already know. Every prop has 4 digits - let's take 5040 as an example. The 50 means it's a 5.0 inch diameter prop whilst the 40 is the pitch of the prop. This means how far the prop would move forward per turn in an ideal world (in a dense fluid or example). So our 5040 prop would pull itself forward 4.0 inches every turn where a 5030 would only make it 3.0 inches.
Now for DAL's lettering.
T at the start of the name means a tri-blade prop
Q at the start of the name means a quad-blade prop
All the other letters describe the tips of the blades.
BN means bullnose - A blunt, cut off tip that gives more surface area and therefore more thrust but you loose some efficiency.
J is a tapered tip. Better efficiency and less load on your power system.
No letter (aside form Q or T) means somewhere between the two, a rounded bullnose tip.
Easy when you know!