Hi Tom, the length that I am measuring is the bit length itself, shown below. Every time I get a dozen or so in stock, they always seem to vary. As for the name, that is probably just me leaving out the word Pro. No worries there. I'm sure it's the same tool.
- Thank you for clearing that up. Sometimes when suffixes or prefixes get dropped, like the PRO, it sends us new guys into a tail spin. 
This image is the one that Jeff use to have up on the Loki Website back when I went to work for him in 2009. He bought his tools direct from CTI and he had many tools on an office shelf to be sent back for warranty at that time. I am sure CTI will do this without an problem for customers, just like Adrian mentioned above. Myself, I have found it easier and more cost effective to simply check each tool I receive and the ones I find that are too long get carefully ground down on a bench grinder. The image below is based off of what he was instructed by CTI at that time and this is what I have always used. If anything has changed since then, I am unaware of it. BTW, I have no idea how the 1.675" measurement on the left effects anything.
*******This is how I was instructed to measure my drill bit, and Jeron's response is that it should be .940 nominal. Perhaps a further conversation with him would be advantageous? I'm not sure I would know the right questions to ask, but this is surely different than what he told me that all Pro Dat tools should measure.*******
Please remember that CTI and Loki delays have different burn rates. And Loki even has 2 different delay types. My mention of changing delay times by "about" a second for each .025" is more of a generalization, based on Loki delays, not CTI delays. So everything I talk about is going to be in reference to Loki delays. Everything Jeron talks about is going to be in reference to CTI delays. Please do not confuse the two.
- That actually dawned on me just before reading this paragraph. Noted, with thanks. So, based on the measurements of the steps on my tool, that would make this true (length of drill notwithstanding):
CTI to LOKI
-3 is a -4
-5 is a -7.4
-7 is a -10.7
-9 is a -14
People have to remember that delays are not completely accurate in the least. Close, yes. Always accurate, no. Temperature for one plays a big part in the burn rate of APCP. Temperature changes pressure, and pressure will change the burn rate of a delay.
The problem with having a delay too short is that the delay is the only thing holing back the pressure from the ejection charge. If the delay is drilled too short, too much delay material is taken away and as the motor reaches burn out, if there isn't enough delay material left covering the touch hole, the chamber pressure in the motor will extrude the delay through the touch hole and light the charge. Worse yet is when this happens well before the motor is done burning and then you've got flames coming out of both ends. So if you're using the shortest delays on your flights, make sure you are checking the drill depth of your tools. If you see an early deployment at burn outor a forward blow by, ask the flier what delay setting they were using and what their tool bit measured, assuming they used a CTI Pro-DAT.
I hope this clears it up a bit. I didn't mean to ruffle any feathers here. I'm just trying to prevent lost boosters and hardware.
- No feathers ruffled at all, thanks for helping clear this up, although I'm not sure we're to the bottom of it, a definitive answer from CTI is in order, as it appears that the tool spec may have changed. In fact, I'm about to order a few more reloads while they're in stock! Awaiting follow up from CTI!
