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ACES rules 2009-2010
Appendix 3.4 E-engines
Side 1 from 3 Version 2008-11-30
Appendix 3.4 E-Engine
1. All classes of IC engine can be replaced with en E-engine power system. Because these have different characteristics, E-engines will have different methods of control from IC power.
2. The most important factor is to limit the accumulator/battery capacity. This makes it possible for the pilot to choose from the many different e-power systems available.
3. To ensure there is no increase in speed and power, we have set these general limitations for all E-systems
3.1 All E-setups must be suitable for a minimum flight time of 450sec in combat. Remember that this is different from normal flight. You will consume more power when flying with a streamer and you must allow for RPM testing at the start of your heat.
3.2 All E-power systems will be limited by the maximum rpm and the pitch of the propeller. This "propstream-
sum" (PSS) will help limit the maximum speed of the model. The "prop-stream-sum" is calculated by multiplying the maximum RPM by the pitch of the propeller in inches. The current limit of the PSS is set at 72000.
This system of control allows for a wide variety of power systems to be used without restrictions other than those based on performance.
Examples:
PSS
pitch
max RPM, rounded
72000
7
10.300
72000
6,5
11.100
72000
6
12.000
72000
5,5
13.100
72000
5
14.400
72000
4,5
16.000
4. In general terms, E-engines will not be the fastest in the field, they have better performance during start and tight turns.
5. Replacement of IC-engines:
engine class
max. Wh
max. prop diameter
min weight
max. weight
.10
28 Wh
9 inch
500g
1500g
.15
38 Wh
9 inch
700g
1500g
.21
50 Wh
10 inch
1000g
1700g ; from 01.01.2010 on: 1500g
.25
67 Wh
11 inch
1200g
1700g ; from 01.01.2010 on: 1500g
normal twin
twice .10 or .15 setups
9 inch
2x see above
1700g
all other multiengine A/C
67 Wh
11 inch
1200g
1700g
6. Penalties:
At large events all models will be RPM tested before the heat starts. Your motor, battery and propeller must be of similar/same specifications as the time the model was booked into the contest. If you have changed your system from this you need to ask the contest director for permission to continue. Your allowed rpm and prop size needs to be documented on your score sheet (it helps the judge).
ACES rules 2009-2010
Appendix 3.4 E-engines
Side 2 from 3 Version 2008-11-30
6.1 According the § 3.4.2 Engine over rpm limit
Check your maximum allowed RPM. If your rpm exceeds the allowed limit by more than 100rpm you will receive a penalty for trying to compete with excessive power. Remember the max rpm figure is regulated by the pitch of your propeller.
Example: 72.000 PSS divide 5 inch pitch = 14.400 RPM (max. deviation over the limit is 14.500 RPM)
The RPM measuring shall be done inside 15 sec.
6.2 early landing in case of too much consumed energy
No penalty is given if a forced landing was due to technical damage, streamer in the prop, collision, plane crash or any other unforeseen circumstance.
If the A/C is forced to land without a technical problem due to lack of accu/battery power and if the contest judge or organiser has doubts of a correct E-setup they can appoint a technical control.
(The organisation will have a specialist for this duty. He will check for excessive power consumption.) The pilot can get a penalty of 0 positive points for this round if he is found to be using too much power.
These point is to discourage the E-pilots who go over the top.
7. Example list of accu compositions
In case of the very fast changing of accu cells in the international market we use the item Wh Watt*hour.
Some possible accu sets: (all LiPo) most used types in rich type. Other cell types can also be used, calculate the Wh with the technical data of your cells.
engine class
nominal volt per cell
number of cells, seriel
capacity Ah, possible parallel
result Wh, rounded
.10
3,7
3
2,5
28
.10
3,7
4
1,8
27
.15
3,7
3
3,4
38
.15
3,7
4
2,5
37
.15
3,7
5
2
37
.21
3,7
3
4,5
50
.21
3,7
4
3,4
50
.21
3,7
5
2,7
50
.21
3,7
6
2,2
49
.25
3,7
3
6
67
.25
3,7
4
4,5
67
.25
3,7
5
3,6
67
.25
3,7
6
3
67
8. Some examples of proven E-setups:
engine class
remark
E-engine
controller
prop
accu producer
accu cells
accu capacity
voltage
Wh
.15 class
cheap class
xx3536xx
30A
.15 class
middle class
AXI 2814/12
PIX3000
Aeronaut 9x5
KOKAM
3S
3300 Ah
11,1 V
36,63
.21 class
cheap class
xx3542xx
40A
.21 class
middle class
KORA 10/12
PIX4000
Aeronaut 9,5x5
SAEHAN
3s2p
2100 Ah
11,1 V
46,62
.25 class
cheap class
xx3548xx
40A
.25 class
middle class
KORA 15/10
PIX4000
APCe 9x4,5
SAEHAN
4s2p
2100 Ah
14,8 V
62,16
.25 class
middle class
KORA 15/12
PIX4000
APCe 11x5,5 (reduc.diameter)
SAEHAN
4s2p
2100 Ah
14,8 V
62,16
ACES rules 2009-2010
Appendix 3.4 E-engines
Side 3 from 3 Version 2008-11-30
A picture of different accu packs.
If you have questions, please send me a mail, I send you more information.
rainer@aircombat.de
Rainer