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Links

Sites I visit often or otherwise really like are in bold.

General Information

The R/C Soaring Guide If there's a more comprehensive description of what R/C sailplanes are all about, I haven't found it. 
See How it Flies An illustrated primer on why planes fly. A must read if you care about the physics of flight.
Fatlion A good description of what R/C sailplanes are all about, information on slope soaring, combat flying, and an excellent list of planes organized by skill level. 
MH AeroTools A web site by Martin Hepperle, inventor of the MH series of airfoils.
The LiftZone
- Discussion Groups
Articles on everything soaring-related. Check out the discussion groups.
The EZone
- Discussion Groups
"The virtual home of electric flight". All electric-powered planes, some sailplane reviews. Lots of technical information on electric motors, speed controllers, propeller configurations, etc. Check out the discussion groups.
R/C Soaring UK R/C Soaring UK. Reviews and technical whitepapers.
Slope Soaring - Hong Kong Reviews, pictures, etc.
SlopeFlyer.com Focused on slope flying. But you probably guessed that.
Redwood Soaring Association A great photo on the home page.

SLO Locals

Andy Schuler's Pics
Bill Mulder Hit the combo box at the bottom for Gentle Lady & Sky Shark info
Berkeley Johnston's Wanderer Only Berkeley would fly a crunchie on our slope.

Foamies

Dave's Aircraft Works A focus on "scale" fliers. I've only seen a couple, and they were fairly tank-like in the air. In strong winds they'd probably be fine.
North County Flying Machines Makers of the Moth, a "plank"-style EPP sloper in the JW style, and Bluto, probably the two best EPP slopers out there right now.
Trick R/C The manufacturer of the famous Zagis.
 

Aircraft Manufacturers

Art Hobby Well-named: these planes really look like works of art.
Dynaflite Notably the Talon & Bird of Time.
Great Planes Great Planes, maker of the Spirit (among others).
F3X.com Nice slope racers, some almost affordable, some not even close.
FVK Modell A German manufacturer of sailplanes. Great stuff.

Graupner

German manufacturer of all things R/C.
ShredAir High-quality (very expensive) F5/3B stuff.
DC Hobby A truly horrible web site with a rude webmaster, but the new owner of the famous Airtronics kit line. Except the Olympic II; he was too good for that kit.
Mad Aircraft More foamies, including the Highlander.
Pole Cat Aeroworks Hammerhead One-design sloper, and some HLGs

Resellers, Aircraft, Parts, etc.

Bruckner Hobbies Radios, good prices.
Dymond Modelsports Sailplanes and electric accessories.
ET-Air Espen Torp, importer of composite planes including the Wizard Compact II, and the Opus.
Hobby Lobby A smallish but good source for sailplanes, electric and otherwise. Well-selected accessories (motors, speed controllers, etc.) for the electric versions.
IRF Machine Works The Little Big Winch, and a rotary driver system.
Maxx Products International All kinds of stuff. I go here for servo extensions, connectors and plugs.
Northeast Sailplane Products Maker of a few, reseller of many. Lots of things to look at here.
Radical RC Another source for connectors and other supplies.
Tower Hobbies Not too many sailplanes, but a good selection of other necessities.
 

Variometers

Picolario It talks back. On-command spoken altitude, tone indicating rising/sinking.
ELV-Telemetriesystem Digital display, also shows on-board battery voltage.

Their website thwarts linking. To see the product, click
- Shop
- Freizeit-Modellsport
- Zubehör - Flugmodelle
Then navigate to the third page.

   

Projects

Turkey Vulture A sailplane that looks like a turkey vulture. Really.
V-Sentry A cheap audible flight monitor/plane finder system. Other neat stuff on this site, too, including a build-it-yourself CAMPac for Futaba radios.