cfiidon
Well Known Member
A few days ago I was on a return trip from SoCal to Norcal. I was IFR at 10,000 MSL and took some data:
MP 21.2
OAT 47F
DA 11530
PA 10,000
Altimeter 29.93
TAS 181kts
From this I used some on-line calculators to determine that the atmospheric pressure at 10,000 ft was 20.39.
So... that gives me a ram air boost of about 0.8 in/hg. Sound reasonable?
I subsequently verified that my MP pressure gauge is accurate (read 29.3 when my D180 altimeter set to zero feet MSL read 29.28). This was done on he ground. OAT read 58F in the hangar when AWOS reported 56F.
I am using a Sam James conical canister and K&N filter. The SJ cowl scoop is modified and adapted to my original updraft scoop lower cowling. The scoop feeds a horizontal cold air plenum. I am thinking this is probably only a little better than the Vans snorkel arrangement, probably owing to whatever added benefit I get from a larger filter area.
Comments?
Don
MP 21.2
OAT 47F
DA 11530
PA 10,000
Altimeter 29.93
TAS 181kts
From this I used some on-line calculators to determine that the atmospheric pressure at 10,000 ft was 20.39.
So... that gives me a ram air boost of about 0.8 in/hg. Sound reasonable?
I subsequently verified that my MP pressure gauge is accurate (read 29.3 when my D180 altimeter set to zero feet MSL read 29.28). This was done on he ground. OAT read 58F in the hangar when AWOS reported 56F.
I am using a Sam James conical canister and K&N filter. The SJ cowl scoop is modified and adapted to my original updraft scoop lower cowling. The scoop feeds a horizontal cold air plenum. I am thinking this is probably only a little better than the Vans snorkel arrangement, probably owing to whatever added benefit I get from a larger filter area.
Comments?
Don