JERC isn’t JERK

 The one that comes up as **"Japan Experimental Rotorcraft Club" is JERC**

- **Full name:** 日本自作回転翼機 JERC Japan Experimental Rotorcraft Club 自分で作るヘリコプター 

- **Website:** `heliflt.com` - titled `Welcome to JERC Japan Experimental Rotor Craft` 

It's described on its own homepage as:

> 自作回転翼機ヘリコプターの研究開発を通して航空スポーツの発展と安全性の向上を目的に作られたクラブ - a club created for the development of aviation sports and improvement of safety through R&D of homebuilt rotorcraft helicopters 

It's not a single airfield with a clubhouse - it's a nationwide homebuilder network. The domain registration / contact that is publicly indexed for heliflt.com points to Osaka:

> GRAND FRONT OSAKA TOWER A 13F 4-20, OFUKACHO, KITA-KU

> OSAKA 

In practice members build and test at private strips / local airfields around Japan - e.g. student rotorcraft groups like Osaka Public University's Sakai WindMill Club use Nanki Shirahama Airport for tests. JERC itself operates mainly online.

The site went offline around its expiration in 2015, so there is no current public street address for a physical clubhouse - if you want to contact them you have to go via the archived `heliflt.com` pages or Japanese homebuilt aircraft forums.