Tapping the hive mind here. I just finished machining out of very cool tailcone for a 2.5 body that is only 1.0" long with about a 2:1 rounded taper. The whole idea was to sink an Aeropack retainer cap in in and thread the same after loading. Tailcone and Aeropack to be bonded with JB. A little nagging doubt finally bloomed in the small part of my pea brain not occupied by Albert Ziemer. The exhaust is recessed by about .70" from the outer edge of the tailcone. Exit dims are .70 deep by approx 30mm. My questions are these:
1) will this reduce the effectiveness of any chosen motor?
2) Does this affect what propellant I should fly? I wanted long burn 29mm Cez motors, but now am I doomed to V-max?
3) lacking any other papers I could find that state "...deeper than one body diameter..." is there any research papers out there I can see that documents a deteriorating airflow turbulence problem as depth increases x and thrust goes to 0?
The rear face is flat and 2.0" in dia. and I was hoping the boundary layer would leave in a little better flow than just a big open wound at the back end.
4) should I just open up the back end a little?
Haven't bonded anything yet- I could just chalk this up as another fun day in the dungeon.
Last edited by fyrwrxz; 4th January 2012 at 10:48 PM.
I'd like to have a smart phone, but I don't qualify.
I'm not user friendly, I have Anti-Social Security.
I don't always do things, but when I do, I think I'm busy
I'm usually left holding the bag. If I got a Right bag, maybe it would be better.
Why is it a launch lug? They are usually too small to carry your rocket to the pad with.
Why do I need an altimeter that talks back to me? I can get that at home.