A blog by RRikesh

Replacing propellers on the Syma X11

After some weeks of flying and crashing my Syma X11 quadcopter, I decided to change its bent propellers. The stock plastic propellers got bent  after hitting hard surfaces, and I have managed to straighten them with my hands and fly again each time. Stability was compromised and I now want to get the original flying stability back.

gearbest replacement propellers syma x11

Replacement propellers for Syma X11

I bought two sets of Syma X11 propellers from Gearbest (Each set contains four propellers). If this is the first time you’re changing propellers, don’t worry, it’s easy.

Why are propellers of different colours?

Propellers are usually colour-coded. For example, the front of my Syma X11 has black propellers while the back has white propellers. This allows you to easily understand to which side your quad is pointing to, while flying. Additionally, the Syma X11 also uses different LED colours to denote front and back.

Motors do not spin in the same direction

If you look closely at your propellers spinning, you’ll notice that they don’t spin in the same direction. For example, on the Syma X11 – the front left and back right motors spin clockwise while the front right and back left motors spin counterclockwise. Each clockwise and counterclockwise motor needs a different propeller.

Propeller labels

You may have noticed that your current propellers are labeled 1, 2, 3 and 4. However, the propellers I’ve received were labeled 1, 2, 2 and 3. Nothing to panic about it, the propellers will work fine if you have one pair of clockwise and one pair of counterclockwise propellers.

CW and CCW propellers

CW to the left and CCW to the right. Look how they are mirrors of each other.

Replacing the propellers on the Syma X11

Once that you’ve figured out which propeller goes where, get yourself a small screwdriver and change the propellers! Changing a propeller takes a couple of seconds!

Changing propeller syma x11

Changing propeller syma x11. Bent propeller to the right

Steps:

  1. Hold the propeller and unscrew it from the top and lift it off.
  2. The second step is to replace the new propeller and screw it back.
  3. Repeat for other three

Your quad should feel new again now 🙂

Happy Flying!

Fixing “Fatal error: Call to a member function set_home_url_scheme()”

Polylang is a cool WordPress plugin that helps you create multilingual websites easily. While cloning the database to another server, I got a white screen of death and upon inspection I found this error:

Fatal error: Call to a member function set_home_url_scheme() on a
non-object in /**servername**/wp-content/plugins/polylang/include/model.php on line 209

Looking in the source code I found:

foreach ($thiscache->get('languages') as $language) {
if (defined('PLL_CACHE_HOME_URL') && !PLL_CACHE_HOME_URL)
$language->set_home_url();

// ensures that the (possibly cached) home url uses the right scheme http or https
$language->set_home_url_scheme();

// use custom flags on frontend only
if (!PLL_ADMIN)
$language->set_custom_flag();
}

Clearly, the code broke when  $language->set_home_url_scheme(); was evaluated, on line 209.

Upon searching on the internet, I came across this thread from Polylang’s support which had the answer: This issue can be solved by deleting the _transient_pll_languages_list transient from the  options table.

That was a quick fix 🙂

WordPress 4.3 is here

Good news! WordPress 4.3 is here!

Almost 24 hours after WordPress 4.3 was released, this version has been downloaded more than 1.5 million times.

WordPress 4.3 downloaded more than 1.5 million times in 24h

WordPress 4.3 downloaded more than 1.5 million times in 24h

What’s new for users in WordPress 4.3?

  • Menus in the Customizer
  • Formatting Shortcuts
  • Site Icons
  • Better Passwords
  • Comments turned off on pages

You can get the details about the new WordPress options on the WordPress 4.3 release post.

What’s new for developers in WordPress 4.3?

  • Addition of singular.php in the template hierarchy.
  • PHP4 constructors get deprecated.

Happy blogging 🙂

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