twistair
Living in the Skies
- Joined
- Nov 24, 2003
- Messages
- 1,161
- Location
- Kronshtadt, Russia
- Aircraft
- none own :( currently flying Calidus mostly
- Total Flight Time
- Don't know exactly, ca. 3000 hours
As we discussed with Chris (ckurz7000) I started today some performance testing which may be interesting for somebody.
First was to see how true ASI shows our airspeed.
Test environment was:
Calidus gyro/Rotax-912ULS/IVOprop Medium inflight adjustable prop
Load: 170 kg crew+20 kg fuel
OAT +24C
500 feet density altitude
Measurements taken by GPS at a triangle base keeping constant IAS during all three legs. IAS pitch was 10 kmh from 50 through 170 kmh. After that field results were filed and CAS was calculated:
Results (kmh):
IAS CAS %%
50 47.0 0.94
60 58.3 0.97
70 66.3 0.95
80 78.7 0.98
90 86.7 0.96
100 100.0 1.00
110 109.7 1.00
120 120.0 1.00
130 134.7 1.04
140 143.7 1.03
150 154.3 1.03
160 165.3 1.03
170 173.7 1.02
Sorry for metric units
To be true these measurements may have some deviation from reality since it was my first experience in such measurements so we simply made them in two flights to become familiar with procedure itself. Tomorrow I'll try to repeat them more precisely.
Anyway correlation looks more or less real.
First was to see how true ASI shows our airspeed.
Test environment was:
Calidus gyro/Rotax-912ULS/IVOprop Medium inflight adjustable prop
Load: 170 kg crew+20 kg fuel
OAT +24C
500 feet density altitude
Measurements taken by GPS at a triangle base keeping constant IAS during all three legs. IAS pitch was 10 kmh from 50 through 170 kmh. After that field results were filed and CAS was calculated:
Results (kmh):
IAS CAS %%
50 47.0 0.94
60 58.3 0.97
70 66.3 0.95
80 78.7 0.98
90 86.7 0.96
100 100.0 1.00
110 109.7 1.00
120 120.0 1.00
130 134.7 1.04
140 143.7 1.03
150 154.3 1.03
160 165.3 1.03
170 173.7 1.02
Sorry for metric units
To be true these measurements may have some deviation from reality since it was my first experience in such measurements so we simply made them in two flights to become familiar with procedure itself. Tomorrow I'll try to repeat them more precisely.
Anyway correlation looks more or less real.
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