The JMP Project
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The project
 Obviously, you do not get such a
result just by chance! Jean-Yves, undeniably the master on
this project, started by building a workshop totally
dedicated to this challenge above his garage! Everything is
there: a precision scale, a one gramme traction bench he
made himself, magnifiers, etc...
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First attempt: the "2xRien" ("Twice
nothing")
Mass analysis:
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Technical data:
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- Completed wing: 1.16 g
- V-tail: 0.36 g
- Sub-total for wing + control surf.: 1.52 g
- Fuselage: 0.98 g
- Gear + 2 wheels: 0.28 g
- Sub-total for fuselage: 1.26 g
- Motor and gearbox 1/22.8: 1.39 g
- Prop. 160x100: 0.42 g
- Sub-total for motorisation: 1.81 g
- ESC special JMP: 0,2 g
- Rx special JMP FM 41 MHz with quartz: 1.55 g
- 2 servos (actuators): 0.96 g
- Control links: 0.29 g
- DC/DC converter: 0.45 g
- 1 x 50 mAh battery: 3.73 g
- Sub-total for radio: 7.18 g
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Name:
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2xRien
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Author:
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J.Y. Martin
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Type:
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Monoplane
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Wing span (mm):
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540
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Length (mm):
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420
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Wing area (dm2):
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8.2
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Mass (g):
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11.7
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Mass (oz)
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0.41
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Wing loading (g/dm2):
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1.43
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Wing loading (oz/sq.ft)
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0.33
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Motor:
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6x10 mm coreless motor
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Gearbox:
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1/22,8
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Propeller:
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JMP 160x100 mm
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Servos:
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Actuators
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Speed-controller:
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JMP-France special
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NiCd battery:
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1x50 mAh
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DC/DC converter
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1.2 to 5 Volts
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TOTAL: 11.77 g
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- Structure, receiver and servos: 5.58 g
- Motorisation, speed controller and battery: 6.19 g
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- The maiden flight
or how a 107 mph wind storm can affect the flight of a 12 gramme
R/C indoor!
Then, what is "nothing" ???
First, you
have to know three things:
- a) Jean-Yves Martin is inveterate man,
- b) Number twelve is not a round number, especially in the
international metric system,
- c) There are in French three expressions which almost mean the same
thing: " trois fois rien" ( three times nothing ), " deux fois rien"
( twice nothing ) and "moins que rien" ( less than nothing ).
Then,
considering the fact that the "Magicien
d'Oz" ( The Wizard of Oz ) weighs around 30 grammes, that is to
say "three times nothing", we come to the conclusion that "nothing"
equals 10 grammes. As the "2xRien" ( Twice nothing ) should,
according to this, weigh 20 grammes but in fact only weighs 11.7
grammes and as Jean-Yves, after optimisation of some components has
now reached 10.6 grammes, I bet that the "2xRien" (Twice nothing)
could become the "Moins que rien" ( Less than nothing ). Are you
still with me ? So, let's continue...
The bet is won: the "Moins que rien"
And it was going to happen...
After a further tenth of gramme trimming here and
there, Jean-Yves MARTIN presented for the first time in
public, on Sunday, February, 6th, 2000 at the Achères
indoor meeting, the "Less than nothing", a 9.8 gramme
Indoor R/C plane.
Jean-Yves even gave himself the pleasure of taking part of
the slowest plane race with his model ; he was only beaten
by the helicos (Piccolo)!
Of course, the differences between the "Twice
nothing" and the "Less than nothing" are difficult to see on
the pictures, except, may be, the battery color and the
perforated wheels...
All details...
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The event was celebrated with Champagne but
Jean-Yves, incorrigible, had to remove few tenth of gramme
from the cork to get the right weigh on the scale...
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(*) : I now must reveal a secret. The objective of
the JMP project was "less than ten grammes" right from the beginning
but the French Twisteuse team is superstitious and do not like to
count its chicken before they are hatched (Translation: do not like
to present you a plane before it flies).
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page.
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