Thank you
to Bruce Edwards from U.K. for help with English terminology
and other lanquage problems.
Palo LISHAK, May 1-st 2007
Basic principles >>>
1- Any Electric Powered model allowed (FAI limits
apply)
2- Any Batter allowed. No limit on number, size
or type of cells (NiCd, NiMH, LiIon, LiPol, etc.)
3 - Any Electric Motor type or size allowed
4 - Unlimited motor run. But all motor run time incurs a penalty
5 - Only one motor run per flight permitted
6 - Working time 10 minutes (600 seconds = 600 points)
7 - Flying task - As long as possible in the working time
8 - Bonus for precision landing (As in F3J)
Processing: we measure and note
>>>
- propeller diameter and pitch
- RPM (full throttle)
- weight of the model
Flight: we record >>>
- total flying time from launch to landing
(value "F")
- motor running time (value"M")
- distance of the model from landing point
(value "L")
Method
for "penalty factor" (Pf) determination:
We use the table RPM versus W out for Aeronaut
CAM carbon propellers from www.aero-naut.de
We measured the RPM
and size of the propeller and assign these values to get W-out
from the graph
We recorded the weight of the model.
<<<<< click for full size picture
We can now compute the value
of PENALTY factor:
Pf =
0,005 * Watt out/Weight (kg)
It can be seen that the Pf=1 for a model which has 200W/1
kg (power out / weight)
For the round score we use following formula:
R = F + L - M*Pf
R
= result in round (points)
F = flying time
from start to landing (seconds=points)
L = landing
bonus points
M = motor
running time (1second= 1 point)
Pf = penalty factor
EXAMPLE 1 :
I have Sensor-plus model, 2000 mm wingspann, S400 motor, gear
3:1, 8 cells GP1100.....
Propeller Aeronaut 11/8", RPM=5500/min,
total weight of the model is 0,780 kg,
Power out from RPM versus W-out is 70
W
Penalty factor for this case will be: Pf=
0,005 x 70/0,780 = 0,449
I use motor for 40 seconds
I have total flying time 8 minutes and
50 seconds (530 points)
Landing - distance from LP no more than 2
m (95 points)
My result is
R= 530 + 95 - (40 x 0,449) = 530 + 95 - 18 = 625 - 18 = 607
points
EXAMPLE 2 :
I have TANGO model, 2600 mm wingspann, AXI 2826 motor, 3S
LiPol 2100 mAh
Propeller Aeronaut 13/8", RPM= 7900/min,
total weight of the model is 1,350 kg
Power out from RPM versus W-out is 380
W
Penalty factor for this case will be: Pf=
0,005 x 380/1,350 = 1,407
I use motor for 25 seconds
I have total flying time 9 minutes and 15 seconds (555
points)
Landing - distance from LP no more than 5 m (80
points)
My result is
R= 555 + 80 - (25 x 1,407) = 555+ 80- 35 = 635 - 35 = 600
points
Palo LISHAK, RIVA models hobby team
May 2007
