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Wednesday, 01 September 2004 22:43 |
- Does the Roswell Flyer use stepper motors are simple DC
motors ?
No it uses cheap mabuchi motor, but each of them is
"drinking" 2-3A, multiply by 4 and you
understand that with 900mAh, you can only fly 4 min...
- Do the electronics contain a gyroscope to calculate level
flight ?
not only one but in fact 3!
- Does it contain a CPU and software to calculate motor
speeds ?
it contains a micro controller with no reference and a
close loop (maybe more than one)
- Do all 4 motors have adjustable speed, and is this done
by changing the voltage ?
Yes with a PWM (pulse wide modulation), though 4
Transistors.
- Do you know of any websites where people build their own
roswell flyer, including description of the electronics ?
Yes richards friedrich with a basic stamp, but i ve heard
nothing since 3 years, a german guy hardwire one with 3
mixer and no gyro (i do not know how it fly), a french
guy made a glow one and take months to make it fly. mike
Dammar develop the draganflyer during 5 years. Nasa is
building one for MARS, but the price of project is in
million dollars. We try to build one, controlling motor
is not the difficult part since some circuit are also
available, reading gyro and determining what to do is
more difficult (our site is
http://www.ifrance.com/Phobos-flyer/). All links are on
my homepage
- Aren't the batteries very heavy, or are they an expensive
kind ?
The weight comes from the battery. The problem of this
heli is power consumption otherwise it is really great to
fly. Hope to see the next generation of battery (methanol
or something else). That will certainly push sales. Right
now Nicad or nimh do notimprovemuch flight time. Li-Ion
are still too expensive $80 or more.
- What makes the kit so expensive, the chips, the motors?
Nothing except the fact that no enough items are made,
hand made is the real name of current production. In fact
Mike says that all heli share the same prize (picollo or
hornet). He refuse to develop a glow version because
there is no market and nobody will pay for it. Moreover
he has a recorded video where in less than a frame
(1/24s) the heli get upside down because a motor died: no
pilot on earth can save the situation.. and the heli in
such case.
- Can propellors be build by cutting them from plastic.
The key of success is the quantities of air you can move
to increase accuracy of controlling...you can discuss
with the builder of the roswell flyer, he is open, his
name is mike Dammar his site is at www.spectrolutions.com
- Do you know of webreferences to instructions to make them
?
no you must build them. Mario who build Micro heli and
sell nice engineered upgrades parts send me a message,
here is a copy:
De: <
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>
Objet: Re: heli blades
Date : Donnerstag, 7. Juni 2001 20:35
Hi Cedric,
The Roswell blades are very easy to make, we are sorry
but we don't carry
blades for such. If you wan to make yourself a set, form
wet sheet 1/16"
thick balsa over a 3 inch tube, hold it in place with
rubber bands. When
dried you will have a balsa tube that you can sand and
cover with epoxy and
carbon cloth, when finished cut to match Roswell blade
pattern, sand the
leading trailing edges lightly and drill to match holes
on the original
blade.
Hope this helps.
You may be interested in our current products which
include micro RC
helicopters, systems and accessories.
Regards,
Mario
www.micro-flight.com/newframe1.htm
- Would it be an idea to put 2 props above eachother to
create a simple indoor heli. This would eliminate the
need for leveling the helicopter
Yes but the mechanics is very complex, it is call a
contra rotor, but you need 2 swashplate and the
controller is difficult ti implement (mechanical mixer to
modify pitch). Moreover no real application except some
russian heli.
Dou you have another questions? feel free to write me
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