swisseagle
Well Known Member
Hello
I'm helping a buddy whith his RV-7A, he bought a new prop, what a beauty! Now to compare apple to apple, how should we test a propeller thoroughly?
- At which Altitude? 5000 and 8000ft?
- At which pressure? Density altitude or pressure altitude?
- Other values to record? OAT, % power, FF?
We got the Catto description as follow:
2-Bladed Glass/Carbon Composite Propeller for RV-7A
72" Diameter x 74" Pitch
TMX-IO-360 Red Gold 180+HP@2700RPM
Top Speed at Target RPM- 200-204MPH@2750RM
The static rpm on this propeller is just at 2300rpm
At 110kts climb speed the rpm is 2450
For cruise 2450rpm is about 155kts.
We are a bit off these values now:
- Static we could only got 2080rpm (field elevation 1300ft)
- Climb at 110kt (at 10'000ft) 2310rpm
- Full power 161kt (171TAS), 2670rpm, at about 5000ft
For sure we will contact Craig, but we want to do this with clean data.
Thanks for any input.
I'm helping a buddy whith his RV-7A, he bought a new prop, what a beauty! Now to compare apple to apple, how should we test a propeller thoroughly?
- At which Altitude? 5000 and 8000ft?
- At which pressure? Density altitude or pressure altitude?
- Other values to record? OAT, % power, FF?
We got the Catto description as follow:
2-Bladed Glass/Carbon Composite Propeller for RV-7A
72" Diameter x 74" Pitch
TMX-IO-360 Red Gold 180+HP@2700RPM
Top Speed at Target RPM- 200-204MPH@2750RM
The static rpm on this propeller is just at 2300rpm
At 110kts climb speed the rpm is 2450
For cruise 2450rpm is about 155kts.
We are a bit off these values now:
- Static we could only got 2080rpm (field elevation 1300ft)
- Climb at 110kt (at 10'000ft) 2310rpm
- Full power 161kt (171TAS), 2670rpm, at about 5000ft
For sure we will contact Craig, but we want to do this with clean data.
Thanks for any input.