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At LDRS34 I test flew my Honest John with a different way of venting the "av bay" for baro sensing. My Honest John av-bay is huge as I simply attach the electronics to a bulkhead and slide the assembly down to a coupler. So everything below is wide open. I did not want to drill large ugly holes in the air frame.
Instead I attached a tube directly to the baro sensor (it is a ported sensor to allow this) and ran the line to a single plastic port in the airframe. In between there would be a small accumulator/filter (volume ~1 cu-in) with baffles and damping material. The technique was successful with a reasonably smooth baro trace through apogee. There is further fine tuning I want to do with the time constant of the filter.
Photo below is a picture of the tube connection to the altimeter.
Instead I attached a tube directly to the baro sensor (it is a ported sensor to allow this) and ran the line to a single plastic port in the airframe. In between there would be a small accumulator/filter (volume ~1 cu-in) with baffles and damping material. The technique was successful with a reasonably smooth baro trace through apogee. There is further fine tuning I want to do with the time constant of the filter.
Photo below is a picture of the tube connection to the altimeter.