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Electricity
has finally come to Control Line!
Maybe control line flyers are a little bit more traditional than other species.
After all - the capabilities of the human body and brain have been developed
over millions of years and do not undergo changing cycles as fast as present
day technology revolutions. Nevertheless the electric drive has been accepted
within our circles, and there are some strong arguments to use this kind
of technology.
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Contest
flyers generally do not immediately switch to new gadgets just because these
are available. After all their placings depend on their equipment. Only
when this has been developed to a level which at least can keep on par with
existing methods, new equipment will be considered. Quite understandingly
so, since there’s still a lot of development to be done. |
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.
But there are also those for whom experimenting is a prime factor in their
modelling world. Thierry Saunier ( France ) is one of those who have accepted
the challenge and has managed to use this power source quite successfully.
Being a creative mind he didn’t choose a common beaten path, but instead
decided to mix a combination of state of the art design concepts, semi scale
appearance, and modern electric power technology. And quite convincingly,
at that! |
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At
a contest in Italy we found some time to talk about his endeavours. Thierry
very freely gave away full information about his equipment. For an “electric
blank” like myself the necessary information is difficult to obtain,
so this kind of information is invaluable. I’m sure for many people
it can serve as a starting point for own attempts in this “current
circuit”. The table below will give all the details. |
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| airplane |
Morane-Saulnier
MS 1500 "Epervier" |
| design |
aerodynamic
layout is influenced by the Beringer school of design and very close
to these dimensions and proportions ( wing shape, flap size, tail
moment arm, etc. |
| weight |
1750
gr ( including 50 gr noseweight ) |
| motor |
AXI
2826/10 |
| propeller |
Graupner
Cam Prop 12,5 x 6 . Also used APC 13 x 6,5 electro |
| battery |
LiPo
Polyquest 4S 3700 , weight 382 gr |
| controller |
Phoenix
60 preferred for safety ( to control temperature ). Also used Phoenix
45 |
| timer |
JMP
programmed for three flight phases:
1) 15 seconds low power while walking to handle
2) sufficient power to fly schedule up to Squarel Eight
3) after Square Eight power is slightly and continuously increased
until end of flight
|
| used current |
3000
mA |
| charging |
at
0,5 C, at about 2 A. Each battery is used only once each day. Each
charge is marked on battery to control number of cycles. |
| charging time |
2h
20 min for 100 % full charge |
| flight time |
5:30 |
| current draw |
36
A checked on the ground. In flight about 32 A. More at the end of
flight. |
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While
for some the soothing sound of a strong combustion engine cannot be simply
replaced by any invisible and inaudible electrons, the electric way might
just be the only possible one for many of us in the future. So - not only
out of curiosity but for real sound ( sound! ) reasons we should throw a
keen eye on this development.
And after all - why not !
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