Dave, the very short coupler piece is there. It is right above the top transition section of the Tiny Tim in between the struts. For me the short coupler tube, which has 2 holes in it, did not fill the entire gap. I had trouble getting the right fit of the Tiny Tim top into the Wac Corporal. I did a lot of sanding. The modeler wants a fit that is good enough to hold the model together during boost, but loose enough to fall away when the second stage fires. I do not have a Rocksim file. For me this model will get plenty of altitude with just an A8-3 in the second stage.Sorry to hear about the damage to your WAC Corporal/Tiny Tim. I have the same kit nearing completion (hoping for good weather today to shoot some paint).
Looking at the photo of your rocket prepped for flight, it doesn't appear that you are using the 'coupler' which bridges the gap between the top of the Tiny Tim booster and the motor mount tube in the WAC; have you found that this is not necessary, that you get positive sustainer ignition without it?
I don't suppose you have a RockSim or Open Rocket file for this particular configuration available to share? (the files on Rocket Reviews do not apear to be for the 24mm booster, 18mm sustainer version)
r/
Dave
Enter your email address to join: