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The purchase
Online or Hobby shop? Sure you can save a couple bucks online, but I always try to support my LHS whenever I can. Some good online vendors ive used are: www.allerc.com www.cheapbatterypacks.com www.towerhobbies.com www.horizonhobby.com www.4mht.com and there are countless others, but pick up the phone book first. If you have an LHS nearby, check out his stock and his prices. |
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Radio: not so easy. The good news is that there are very few radios available that are sub-standard today. The bad news is that there are hundreds to choose from. You want to order what suits your expectations. An inexpensive GWS transmitter works fine, but you’ll eventually end up buying a nice 6channel computer radio for your 2nd or 3rd plane. If you have the cash and you expect to be in this for the long haul, go with a sweet radio right off the bat. You wont have to buy twice. If your unsure, the lesser expensive radios will be fine. The only feature you really NEED at this point is ‘servo reversing’. More on that later. Just be sure to get a 4channel (minimum) and get it with an ‘air’ designated frequency. Here in the ‘states, that’s 72mz, and 27mhz. Given the choice, id rather have 72mh. The 27mhz band is used on every single cheap Radio shack rc toy there is, plus its very close to the CB band, so you have a better chance of getting hit with interference.
Please check around if you don’t live in the states to see what bands are designated RC ‘air’ and order accordingly. You usually have a choice between dozens of channels within the band. Just pick one. Doesn’t matter. If you live in Central NJ, just don’t pick channel 42…. Transmitters are generally sold with the frequency crystal. Receivers are not. You will need 1. a transmitter 2. a receiver 3. a receiver crystal that not only works with the receiver itself, but is the same channel that the transmitter comes with. Be advised: for the most part, transmitters and receiver crystals are brand-specific. A GWS receiver crystal may not work in a Hitec receiver… Unless you are ordering a package deal, be sure to stick with a brand. You may be confused by all the three-letter acronyms that are used to describe radio features. Here’s a list of some features and an opinion of their value. If you don’t care, please skip ahead to “The rest of the gear” section. PCM = Pulse Code Modulation. Instead of sending the receiver simple commands like ‘up’ and ‘left’, everything is sent in an 8-bit code. If the signal that reaches the Rx isn’t precisely in that code, the receiver does nothing. This is the ultimate way to filter out noise. Unnecessary for the Slowstick, but hey, if ya got the scratch, it certainly wont hurt. This would only be found in investment quality radios, like $200 & up. Again, a simple Fm 4 channel radio will usually do the job fine. EPA = End Point Adjustment. Can be used to limit the travel of the servos if you want. Not as useful as Dual Rates, but ok. D/R = Dual Rates. A servo travels 60 degrees each way. If you set up the linkages to ‘throw’ the rudder & elevator as far as they go, then you will have an extremely nimble plane that can do loops in the blink of an eye and can do a U-turn in about 6 feet. The downside is that minor flight adjustments require much more practiced and sensitive thumbs. The plane feels like its going all over the place. Dual rates allow you to cut the throws to half, while using the full range of the stick. Typically you flip the D/R switch for takeoff, landing and for relaxing flight. Set to Full rate, your doing loops, stunts, combat etc. Gives you the option to mellow out or ‘kick it up a notch’. EXPO = Exponential servo travel. Not unlike D/R, with this feature you can set your servos sensitivity to your input. With expo enabled, you can have very fine, precise control of your elevator and rudder, while still maintaining ability to do stunts. This is a nice feature. Without expo, the servo moves the same amount for every little bit of stick travel you give it. 0=0, ½ = ½, full = full. With Expo, 0=0, but if you move the stick say ¼ of the way, the servo only moves say 15%. Move the stick ½ way and the servo moves to say 33%. Move the stick up to ¾, and the servo starts increasing its throw to maybe 66%. Move the stick all the way, and the servo goes to 100%. Dual Conversion. A dual conversion receiver filters the signal twice. Less interference. More money. Not generally necessary on a little electric plane unless you live in an urban or industrial area where you will experience lots of the dreaded Radio Interference (RFI). Very important for a larger glow or gasoline planes. Little electric planes might hurt somebody if you lost control, but internal combustion planes can kill. Shift. This is REALLY important. You MUST order a transmitter and receiver that have the same shift. Futaba, GWS, and Hitec transmitters use a NEGATIVE shift. JR and Airtronics (sold as Sanwa in some countries) use POSITIVE. A (-) transmitter and (+) receiver wont talk to each other. Since you will probably be ordering both from the same supplier, just ask him to be sure they work together. Neither is better than the other, just be sure your equipment matches. AM/FM. Turn on your car stereo. Hit that ‘AM’ button. Now try FM. Whaddya think is better? Trainer Compatible. A VERY nice feature IF you have someone who can train you. By simply running a cable between your radio and your instructors, you can fly until you get into trouble and with the flick of a switch, the instructor can take over control of the plane. If an instructor is available to you, find out what kind of radio he has and be sure to order one that’s compatible. Many different radio brands cant ‘talk’ to each other, or at best, an adapter cable is hard to find. You will probably also have to order the trainer cable as well, unless your instructor already has one. I like this guy: http://stores.ebay.com/Toms-RC-Simul...derLinksQQtZkm Servo Reversing. Its hard to find a radio these days that doesn’t have it. Ok, so you’ve built and installed everything. You read my section about pre-flight checks. You were a good boy and actually did one. Unfortunately, you see that your rudder moves right when you move the stick left! What to do? Flip a tiny little switch somewhere on your transmitter. Simple. Some computer radios don’t have little switches, instead, you have to scroll through menus and hit ‘enter’ buttons or some such thing. |
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Battery: There are three categories to choose from.
1. Nickel-Cadmium (Nicad) Dirt cheap, indestructible, heavy as a brick. Flight times will be quite short. 2. Nickel Metal Hydride (NiMH) Reasonable price, fairly durable, Longer flight times than nicad. 3. Lithium Polymer (Lipo) ‘Spensive. Not durable. Unreal capacity. About 3 times as much as Nimh. The chemistry of a lithium battery is POTENTIALLY dangerous though. Any denting, puncturing, overheating or improper charging could result in a rather nasty fire. Statistically, it doesn’t happen that often but when it does, your house or car usually catches fire too. Lipo’s are typically not recommended for beginners. I have experience with only one GWS battery – my first one that came with my package deal. A 7cell 730mah nimh I think. It really didn’t work out well. Between the high drain stresses and my crappy charger, I had nothing but problems. Upon the advice in the forums, I then picked up a couple KAN packs and had great success. KAN is a brand name, and they make two different NiMH cells that’ll work – the 1050mah and the 650mah. The smaller 650 is better suited to some of Gws’s other planes that are more weight sensitive. Since the Slowstick actually flys better with a little weight, the 1050 is the way to go. The ‘mah’ part is the batteries capacity, in Milli-Amp-Hours. Example: a 1050mah battery can run a 1.050amp load for theoretically 1 hour before its dead. The math is proportional too. If your load is 10 amps, it’ll run 1/10th of an hour, or 6 minutes. If your load is way too much, say 20 amps or more, then the battery is being overworked and will not live very long. You will see very often batteries will have their discharge limits described by a ‘C’ rating. A KAN 1050 cell is rated for 15C, meaning it can be safely discharged at 15 times its capacity. (1.050a x 15 = 15.75amps) If you were to place a load on the battery greater than 15.75 amps, you would shorten its lifespan. Fortunately, the average Slowstick only ever really draws 7-10 amps at wide-open throttle. Typically I get 10-12 minutes of runtime at full throttle out of one pack, and they are barely warm when I land. A battery also has a charging rate expressed in “C” as well. The higher the ‘charge C’, faster you can charge it. Nicads can be charged really fast, at like 4C or so. Nimhs and Lipo’s don’t like much more than 1 maybe 2C. So if you get a 1050 battery, set your charger between 1 and 2 amps. I prefer 1amp. Takes twice as long to charge, but your cells will get fully charged and they will live longer. So in short, I recommend the KAN 1050 pack for your Slowstick. If you get the 300 motor, go with 7 cells. For the 400 motor, go with 8cells. These packs can be bought at www.cheapbatterypacks.com, and like the name implies, they are very cheap! About $17 each. Buying several packs means you can fly longer. Optional: GWS speed controllers & batteries have always come with the little red plugs called “JST connectors”. They are really not rated for much current, but they usually do the job. Cheapbatterypacks will build your packs with any connector you choose, including the JST. If you want a little extra reliability and performance, and you don’t mind doing a little soldering, then I suggest ordering the batteries with quality Deans Ultra plugs right from the start. You will also need to order a couple loose Deans Male plugs to solder onto your ESC and your charger. Again, this is optional. The JST’s will do, and you can always upgrade to Deans plugs later. Getting them from the start will save a bit of work later on. |
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Charger: Again, lots of options here. There are three things you absolutely MUST have.
1. your charger must be compatible with the battery you get. DON’T charge a Nimh with a Nicad charger – you’ll ruin it. Try to charge a lipo with a Nimh or Nicad charger and you’ll very likely start a fire. 2. Peak Detection. Not ‘peak predicting’ or timer style chargers. They are junk. 3. Charge current that suits your battery. Some chargers are adjustable, so you can set it for different size batteries. Nice feature. Otherwise, just be sure it will deliver 1amp. Less is fine, it’ll just take longer to charge. More will shorten your batteries life. Many chargers are available in DC only. A few are AC/DC – but generally cost more. A DC charger typically runs off your car battery or cigarette lighter, but you can also buy or build a 12v power source so you can charge from the comfort of your workbench. If your handy with a soldering iron, you can hack the power supply from an old computer (what I did) for almost no cost. Junk computers typically line the streets on garbage day, just grab one. Note: big computers have bigger power supplies. Little desktops may not be big enough to run your charger, plus they are harder to get your fingers into to work on. Go to www.rcbatteryclinic.com and scroll down to the bottom on the left side. All you need to know. I recently junked my lousy MRC 959 charger and bought a Hobbico 12v Quick Field charger MKII. I’m very happy with it. It can charge two different batteries at once, has adjustable current, can be set to charge Nicad, Nimh or lipo, and was affordable at $60. You will need a power supply though or your stuck charging from your cars cigarette lighter. The only charger I know of that can do everything and runs on AC or DC is the Hobbico Accucycle Elite, but its $150. It also can do two batteries at once, and it has a nice display readout that tells you what’s going on. I’ve heard good things about the affordable Wattage PF-12 ac/dc charger too. All the features you really need, nicad/nimh only, for $60. The GWS 12volt charger seems ok from what ive read, but I have no personal experience with it. Consider it a decent option if your on a budget and don’t mind the 12 volt issue. I have nothing nice to say about the MRC line of chargers though. They claim to do all sorts of things, but my old 959 is a pain to use and false-peaks often. The newer 969 is supposed to be Lipo compatible, but it doesn’t peak-detect lipos, causing a potential overcharge and fire. Avoid. Generally speaking, I do not like wall-wart style chargers. They take forever to charge and they don’t stop once the pack is full. These are a good example of “You get what you pay for”. |
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Summary
I recommend this for your initial order: http://www.allerc.com/store/product_...products_id=50 http://www.allerc.com/store/product_...oducts_id=1003 http://www.allerc.com/store/product_...roducts_id=628 http://www.allerc.com/store/product_...roducts_id=161 http://www.allerc.com/store/product_...oducts_id=1109 http://www.allerc.com/store/product_...roducts_id=433 http://www.allerc.com/store/product_...roducts_id=994 and finally, batteries from cheapbatterypacks.com: http://www.unipros.com/cbpsite/packs...sion_id=181484 (the A7KAN1050FT listed partway down – you want AT LEAST two packs, I have seven!) |
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Waiting for Mr Postman: Your eager as hell now and wishing you’d paid an extra $50 for Fed-Ex overnight delivery. But there is still a way to satisfy that flying Jones. Go to http://n.ethz.ch/student/mmoeller/fms/index_e.html
And download FMS flight simulator. It’s free! You can control the planes with your keyboard or go to Toms ebay store and get an adapter cable so you can plug your transmitter right into the computer. http://cgi.ebay.com/ws/eBayISAPI.dll...916731698&rd=1 He also has good prices on the radio equipment itself, so keep that in mind. One nice thing about FMS is that there are countless different planes you can download for it. Just do a google search. Here’s a few, including the Slowstick: http://gunnerson.homestead.com/files/fms_models.htm |
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