Pse Decipher Abbrevations

Ok, after 50 yrs of inactivity I pick up a copy of "Flying Models" and find these terms- pse help me understand them. Tnx, Jim.
EDFs
4S Li Po. Guess Li Po is lithium polonium and 4s Might be 4 cells in series?
3S640 mah. Yes, mah is milliampere- hours to this E.E. But 4s?
Moulded CF components.
80 C discharge rate. Is C coulombs, or its equiv., ampere seconds?
Short Kit. I can guess but could be wrong.
yA hinges
12 amp. ESC
A 10 S pack
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Electric ducted fan

LiPos can be arranged in (S)eries or (P)aralell just like Nicads. 3S is 3 in a series, 4S is 4 10s is 10

Carbon Fiber, very strong material used to make "composite" parts

C is current rating, 1C on your 3S 640 up there is 640.

A short kit gives you plans and key parts like ribs, you cut out the easier ones of you own balsa

no clue. CA hinges are plastic covered with material that CA(hot stuff, super glue) sticks to

Electronic speed control rated at 12 amps. There are ESCs for DC motors and there are 3 wire ECS for brushless motors. Many of these ESCs are programable by various means. You can change the voltage you supply to them( 2S or 4S or whatever) you can make them shut off abrubtly so they fold your folding prob on an electronic sailplane. Powered gliders can be much lighter than they used to be. Another aspect of ESCs is BEC. BEC is battery eliminator circuit. An ESC will provide your radio with the correct voltage to run it and also varying voltage to the motor so you can eliminate your RX battery ans save weight. In theroy your ESC will cut off power to the motor when the voltage gets too low as ot not run your RX. There is an inherent risk in having your power to your motor quit abruptly as opposed to slowing down noticable and giving you a chance to fly out of a trouble spot. Although, my tree climbing abilities are comming back to me becasue of this even though I'm now in my late 40s. :)

10S pack represents lots of money.(jk) That would be 10 lipos in a series.
With the lipo battries and many little motors nowdays you would be very impressed with what you can fly with electric. With enough money you can fly some VERY big planes aerobatically!
mk
http://www.wattflyer.com/forums/index.php? electric fourm(i am not a member)
http://www.atsrcplanes.com/speedcontrol.htm ESC example
http://www.rcuniverse.com/magazine/article_display.cfm?article_id 2 This about EDF, the back issues are on the left, click on any you are curious about.
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Electric Ducted Fan

see http://www.rcmodels.ca/lipoly_safety.php - #S indicates the number of cells in series

As above

Most likely , CF = Carbon Fiber

From the cited link above: "* "C" is a 1000:1 ratio of the capacity of a cell or pack in mAh to a given current in Amps. It is normally used to define maximum current-handling capabilities for charging (e.g.1C or 2C) and discharging. A large "C rating" for discharge permits high currents from smaller packs, for instance a 20C continuous rated 5000mAh pack is able to deliver 100 Amps continuously. In this instance, 20C constant should be seen as the maximum "full throttle" that can be applied ongoing before damage to the pack will be inevitable. Like running a sports car at full throttle all the time, habitually running a Lipo pack at its maximum C rating is not good practice"

Generally, pre-cut ribs/formers and associated molded / formed parts (like cowls).....

?? could that have been 1/2 A or CA??

ESC = Electronic Speed Control (how you throttle an electric). 12 amp is, of course, the current load the speed control is rated for

Same as first two, number of cells in series (undefined power rating)
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Thanks to all. I appreciate it. Jim

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Since no one else corrected this one...
LiPo = Lithium Polymer, not polonium.
Basically, it's a lithium ion battery but different construction.
Brian
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On Sat, 12 Sep 2009 21:01:37 -0400, JFL34 wrote:

Well, you picked up the right mag (or at least my favorite one).

Electric ducted fans.

Lithium-Polymer. There are a number of variations on the lithium battery theme; LiPo was the first one that was really successful as a model airplane motive battery. I think polonium is radioactive; no matter how well it'd work in a battery radioactivity would tick of the regulatory folks.

3 cells, 640 milliamp-hours.

CF = carbon fiber.

Neither. "C" is the one-hour discharge rate, i.e. if the battery is rated at 1000mA-h, then 1C = 1A. (by the way, 80C -- particularly in a LiPo -- is fantasy. Look close, and you'll probably see that it's a "momentary discharge spec" or some other marketing BS).

A kit with only some of the parts provided, usually aimed at the expert builder. This is usually stuff like foam cores, unique hardware and/or molded parts. You're expected to supply all of the "normal" dimensional balsa, spruce, music wire bits, etc.

CA hinges (not to be confused with CYA). CA is cyanoacrylate glue; a CA hinge is a bit of plastic sheet that's custom made to work well as a hinge if you glue it into a slot with CA.

An electronic speed controller that can supply up to 12 amps to a motor.

Ten cells in series -- if they're LiPo cells that's around 34 volts, which implies a BIG plane. If they're NiCd or NiMH then that's around 12V, which is moderately large and moderately (to exceedingly) obsolete.
--
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For LiPo's that discharge rate is a blatant lie, they don't go that high (yet?). Thread in the 'high performance' subforum: http://www.rcgroups.com/forums/showthread.php?t 09269

LiPo and balancer wiring diagrams http://scriptasylum.com/rc_speed/_lipo.html System wiring diagrams http://scriptasylum.com/rc_speed/_wiring.html
For a rainy day ...
*** Get a current/Watt-meter, it will save you money and will more than pay for itself!
*** Presentation: de-mystifying Electric Flight http://www.rcaircrafters.org/The%20Electric%20Show.pdf
Get a current/Watt-meter :)
*** http://www.ampaviators.com -> Beginner Guide
Get a current/Watt-meter :)
*** E-book: Everything You Wanted To Know About Electric Powered Flight http://homepage.mac.com/kmyersefo/everything-e-power.pdf Corresponding discussion: http://www.wattflyer.com/forums/showthread.php?t1071
Get a current/Watt-meter :)
*** Several Wiki's http://www.wattflyer.com/forums/vbglossar.php
Get a current/Watt-meter :) 3$ diy Watt-meter: http://www.rcgroups.com/forums/showthread.php?t 9923
*** http://www.ezonemag.com -> Faq
Get a current/Watt-meter :)
*** System wiring diagrams: http://scriptasylum.com/rc_speed/_wiring.html *** LiPo pack and balancer cable wiring: http://scriptasylum.com/rc_speed/_lipo.html
Get a current/Watt-meter :)
*** Monthly Ampeer newsletter, on paper and online available. Excellent articles in the archives by e-flight pioneers Ken Meyers and Keith Shaw a.o. http://homepage.mac.com/kmyersefo
Get a current/Watt-meter :)
*** Brushless motor animations and simulations. Mostly outrunners but inrunners are just outrunners turned inside out, nothing fancy: http://www.rcgroups.com/forums/showthread.php?t !6928
Get a current/Watt-meter :)
*** Choosing a power setup http://www.rcgroups.com/forums/showthread.php?ts9069 http://www.wattflyer.com/forums/showthread.php?t '019
Get a current/Watt-meter :)
*** About de-rating controllers and motors, starting at 'for everyone else': http://www.rcgroups.com/forums/showthread.php?p 476940#post11476940
Get a current/Watt-meter :)
*** E-flight calculators, a compilation http://www.rcgroups.com/forums/showthread.php?t `6703
Get a current/Watt-meter :)
*** Current, voltage, Watt, battery-types and -C-rating explained http://www.rcgroups.com/forums/showthread.php?tA7868
Get a current/Watt-meter :)
*** About BECs, #servos and battery voltage: http://www.rcgroups.com/forums/showthread.php?p 679182#post11679182
Get a current/Watt-meter :)
*** 'Dry' testing brushless motors after a mishap: http://www.wattflyer.com/forums/showthread.php?t5216 http://www.rcgroups.com/forums/showthread.php?t $0993
Get a current/Watt-meter :)
*** How to repair a brushless motor http://www.rcgroups.com/forums/showthread.php?t 79423
Get a current/Watt-meter :)
*** Motor_rewinding_101, about poles, winds, delta, star http://www.gobrushless.com -> knowledge base -> basic overview (1-5)
*** And I almost forgot, get a current/Watt-meter :D
Vriendelijke groeten ;) Ron near Nijmegen, Netherlands http://home.hetnet.nl/~ronvans /
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