Altimiter Port Placement

Robshe01 said:

Quick question for the group.

I am making some modifications to a 4in rocket and have decided to put an altimiter bay in the nosecone. Basically I am cutting off the bottom of the cone and epoxying in a 38mm motor mount tube to hold my altimiter and rocket tracker.

My question is on the vent holes for the altimiter. Does it matter if I drill the holes toward the front of the nosecone on the part that is sloped or do the holes have to be at the base where the diameter is not increasing.

Seems like a stupid question, but I think someone was warning me once, not to put an altimeter bay between the fins of a rocket because the uneven airflow coming throught the fins may cause incorrect pressure readings.

Also is their any issue of putting a walston rocket transmitter in close proximaty to a missile works RRC2 mini.

Any thoughs or comments?

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SpartaChris said:

I don't know the answer to your question, but if uneven airflow is a concern, then you might want to put the altimeter further down the airframe of the rocket. I think the standard rule of thumb for baro units is at least 3 calibers of straight surface for altimeters. Accelerometers on the other hand don't usually have this as a requirement.

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