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Pete's Planes |
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Flight Analysis No1 Commuter Date of test flight 18 Sept 05 Data recorded with EagleTree V2 onboard datalogger.
Model Data.........motor--Jamara 480HS BB........prop--Master Electric 10"D 7"P [measured zero-thrust pitch is 8.3"] ............gear ratio 3.0.......span 62"........wing area 2.65 sq ft..............AR = 10.............weight 45 ozf = 12.5N............wing loading 17 oz/sq ft
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initial climb |
slow climb |
level cruise |
shallow glide |
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| timeline | secs | 950--960 | 960--990 | 1050--1090 | 1090--1110 |
| battery out power | W | 160 | 105 | 65 | zero |
| power/weight | W/lb | 57 | 37 | 23 | zero |
| airspeed | mph | 22 | 25 | 25 | 25 |
| m/s | 9.8 | 11.2 | 11.2 | 11.2 | |
| prop speed | rpm | 5700 | 4600 | 4000 | -- |
| pitch speed | mph | 45 | 36 | 31 | -- |
| rate of climb | ft/sec | 6.5 | 2.1 | zero | -3.4 |
| ft/min | 390 | 126 | zero | -204 | |
| m/s | 2.0 | .64 | zero | -1.04 | |
| angle of climb or glide | sine | 1/4.9 | 1/17.5 | zero | 1/10.8 |
| degrees | 11.8 | 3.3 | zero | 5.3 | |
| tangent | 1/4.8 | 1/17.5 | zero | 1/10.7 | |
| gravity power [A] | W | 25 | 8 | zero | -12.95 |
| drag power [B] | W | 8.8 | 12.95 | 12.95 | 12.95 |
| flight power [A+B] | W | 33.8 | 20.95 | 12.95 | zero |
| overall propulsion efficiency | 21% | 20% | 20% | -- |
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Highlighted values obtained
from graph.
Revision 16 Oct 05 : Pitch speeds calculated using measured pitch [previously with nominal pitch].
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