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Introduction
Glossary
1) Beginner issues
| A101 |
Why fly electric? |
| A102 |
How do I get started? |
| A103 |
What kind of planes can I fly with electric
power? |
| A104 |
How do I sign up for the AMA/MAAC? |
| A105 |
What Kind of equipment do I need? |
| A106 |
What special tools would I need? |
| A107 |
Can you suggest a few beginner setups? |
| A108 |
Are soldered or crimp joints better? |
| A109 |
What goes on which stick? |
2) Safety
| A201 |
What safety procedures should I follow when flying? |
| A202 |
What is an arming switch? |
| A203 |
When should I use an arming switch? |
| A204 |
How much power will I lose? How much weight will I gain? |
| A205 |
What is a fuse? Why use one? |
| A206 |
What type of fuse should I use? |
| A207 |
How do I choose the fuse rating? |
| A208 |
How and where do I install the fuse? |
| A209 |
Are there any safety precautions for the motor battery? |
| A210 |
How do I fuse a brushless motor? |
3) Batteries
| A300 |
Battery Basics |
| A301 |
What's Volt, Amps, "C" rating,
etc....? |
| A302 |
What are milli-amp hours? |
|
A303 |
How fast can I charge my batteries? |
|
A304 |
What is Nicad memory? |
|
A305 |
What is Cell reversal? |
|
A306 |
Should I cycle my packs? |
|
A307 |
Can I deep discharge an individual cell safely? |
|
A308 |
What is the discharge of a Nicad like? |
|
A309 |
Black Wire Syndrome |
|
A310 |
Low Tech Cell Matching |
|
A311 |
What are the effects of series and parallel? |
|
A312 |
What are NiMH batteries like? |
|
A313 |
Can I use Lithium batteries for electric flight? |
|
A314 |
What do the battery codes like SCR, AE mean? |
|
A315 |
Is it safe to solder directly to batteries? |
4) Electric motors
| A401 |
What does "breaking-in" a motor actually do? |
|
A402 |
How do I break-in a motor? |
|
A403 |
What does gearing do? |
|
A404 |
How do I compare an electric motor to an IC engine? |
|
A405 |
What are motor constants? |
|
A406 |
What's the difference between Delta and Wye Brushless Motors? |
|
A407 |
What is "timing"? |
|
A408 |
How much should I advance a speed 400? |
|
A409 |
How do I use the "speed 400 timing tool?" |
|
A410 |
How much heat can our motors dissipate? |
|
A411 |
How can I keep my motors clean? |
|
A412 |
What is a sensorless motor/controller? |
|
A413 |
How does a sensorless motor work? |
|
A414 |
What do the motor names (Speed 400,600, 05, 25) mean? |
|
A415 |
How do I do a "Water break-in" ? |
|
A416 |
How do I measure motor constants ? |
|
A417 |
Will this cheap Mabuchi 540/380 etc. be good for E-Flight ? |
|
A418 |
How many capacitors do I need on my motor and what values ? |
|
A419 |
Should I wire two motors in series or parallel? |
| A420 |
Where can I find some information on common
brushed motor constants? |
5) Speed controllers (ESC's)
| A501 |
How does a speed control work? |
|
A502 |
What is the advantage of a High Rate Control? |
|
A503 |
What is the best switching rate for a hi rate ESC? |
|
A504 |
How does a motor brake work? |
|
A505 |
What is a BEC and how does it relate to the speed control? |
|
A506 |
What are the disadvantages of a BEC? |
|
A507 |
What is a Cutoff? |
|
A508 |
How long can I fly once the cutoff takes place? |
|
A509 |
What is opto-isolation and what does it do? |
|
A510 |
How do I disable the BEC on my speed control? |
|
A511 |
Where does my BEC speed control plug in ? |
|
A512 |
Can I control 2 brushless motors with one controller ? |
6) Propellers
| A601 |
Why doesn't my Graupner folding prop extend all the way out? |
7) Chargers
| A701 |
How does charging current relate to capacity? |
|
A702 |
How can I make certain my packs are fully charged? |
|
A703 |
How does a peak (or delta peak) charger work? |
|
A704 |
Will my charger work with Ni-MH batteries? |
|
A705 |
Will a NiCad peak charger work with Lithium batteries? |
8) Model info
| A801 |
What are the differences between Indoor, Slow and Park flyers? |
|
A802 |
What are EDF models? |
|
A803 |
What exactly are EPS/EPP/Depron and other construction foams ? |
|
A804 |
What is the watts/pound rule? |
|
A805 |
What does the Watt-hours/pound rule tell me? |
|
A806 |
How do I match an electric power system to a given airframe? |
|
A807 |
How do I convert a gas powered plane to electric? |
| A808 |
Are there any proven electric setups listed
anywhere? |
9) Electrical formulas
| A901 |
How do I calculate duration? |
|
A902 |
How do I calculate Watts? |
|
A903 |
How do I convert units of measure? |
|
A904 |
What is Orme's Law? |
Reference resources
Mailing lists
FTP sites
Web pages
Newsgroups
Non-electronic Resources
Magazines
Books
Contributor Credits
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What is the advantage of a High Rate Control?
Q. What is the advantage of a High Rate Control?
A. Doug Ingraham, Lofty Pursuits
The simple answer is the efficiency is greatly increased over that of a frame
rate control.
An electric motor wants to turn at a certain speed that depends on the
voltage that is being supplied to it. The best speed control would provide a
nice clean DC voltage that varies from a maximum that is the same as the battery
down to zero volts. The frame rate control fails to do this because the motor
sees full voltage during the on times and zero voltage during the off times.
If you were able to measure the amps that flow into the motor during the on
time you would see that they are much higher than expected. These high currents
end up heating the motor and battery almost as much at every throttle setting
above 20% as at full throttle.
One way to make low-rate controls more efficient is to place a good size
capacitor across the motor terminals. This tends to average the voltage
somewhat.
The high rate controls work by reducing the voltage that goes to the motor.
The reason they can do this is because the motor is not a pure resistive load.
It has some of the same characteristics of an inductor and it is these
characteristics that make a high rate control more efficient. An inductor that
has current flowing through it tends to want that current to continue to flow.
If the voltage is turned on and off fast enough the current will continue
flowing smoothly through the motor.
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