If you were planning on going really fast, really quickly, then you can certainly consider venting out the base for internal pressurization equalization - there are some theoretical advantages to that. I would still vent out the side for barometric measuring though for the reasons Aaron mentioned.Instead of putting the hole in the body tube could I put them in the motor mount rings and venting out the back of the rocket?
The JLCR still needs accurate barometric readings before it is ejected. I would still use body tube vent holes.This was just for pressure equalization and not altimeter readings… doing a few launches this weekend, starting at about 3900 asl … launching approz 6400ft agl … using a jolly logic chute release, did not really want to drill a hole in the body tube. That is why i was thinking about going through the motor mount rings from the bottom.
Every "bay" should be vented. Both parachute bays only need a small hole. I use 1/8" up to 4" diameter rockets. 3/16" up to 7.5" Your av-bay needs sensing holes more than vent holes but same idea. 3x 1/4" up to 4" and 3x 3/8" up to 7.5"
I have a TeleMetrum and I don't see anything about AV Bay Static Pressure Port sizes in the manual.Recommend you do whatever is recommended in the altimeter manual for the av bay static pressure ports.
Indeed! I didn't mean to imply my method was the only, best or even correct way. Just that it is how I do it. You should always follow the manufacturer's directions.Recommend you do whatever is recommended in the altimeter manual for the av bay static pressure ports.
Understood, and surprised they do not mention it.I have a TeleMetrum and I don't see anything about AV Bay Static Pressure Port sizes in the manual.
This is all I really see on the topic:
"The barometric sensor sampling port must be able to “breathe”, both by not being covered by foam or tape or other materials that might directly block the hole on the top of the sensor, and also by having a suitable static vent to outside air."