OK, building my 1/4 scale PML Patriot for level 1. Also building up the Black Brant Vb in case I chicken out on the Patriot ().
In the instructions for the Patriot, it talks about drilling a bleed hole for air in the payload section, and it infers that this is to keep overpressurization from being a problem during flight (I realize that you need a hole for altimiters, but I'm not discussing that here).
The first question that this raises in my mind is whether or not you would also need a similar bleed hole in the main airframe, below the payload section. It would seem that if the air pressure is going to cause a problem with the nose cone separating from the payload section, there would equally be a problem with the payload section separating from the main tube.
The second question concerns the angle at which such a hole should be drilled. Should it be straight (perpendicular to the tube), or should it be angled? If angled, should it be angled pointing up or down?
My 'guess' would be that you would want to angle it down, such that the upward flight does not cause airflow to move INTO the payload section or body tube, but that's just a guess.
Any on-topic responses would be most appreciated.
David Erbas-White