FireMedic_2009
Well Known Member
Does anyone have a prop test procedure in order to compare two fixed pitch props? I will be testing a 2-blades prop and a ground adjustable 3-bladed prop and would like some ideas or procedure on how to compare.
I know I have to test them at the same density altitude. Not sure if it really matters if it’s at 5500ft or 8500ft although I believe the 3-blade is a little better at higher altitudes like 11500ft so I guess I can take some data points at high altitude.
In level flight I can get airspeed at various rpms, 2300, 2400, 2500, 2600, WOT
If the density altitude is similar at the airport elevation than you can obtain true takeoff data which you can get fpm data at various airspeed climb outs, 85kts, 100kts, 115kts. If the density altitude is a 1000ft above the airport elevation from what it from the first prop I guess you could start at 1000ft above the airport and level off at 85kts and than firewall it begin your climb.
Please add any suggestions you may have.
Thanks
I know I have to test them at the same density altitude. Not sure if it really matters if it’s at 5500ft or 8500ft although I believe the 3-blade is a little better at higher altitudes like 11500ft so I guess I can take some data points at high altitude.
In level flight I can get airspeed at various rpms, 2300, 2400, 2500, 2600, WOT
If the density altitude is similar at the airport elevation than you can obtain true takeoff data which you can get fpm data at various airspeed climb outs, 85kts, 100kts, 115kts. If the density altitude is a 1000ft above the airport elevation from what it from the first prop I guess you could start at 1000ft above the airport and level off at 85kts and than firewall it begin your climb.
Please add any suggestions you may have.
Thanks