Both OS and YS are releasing new engines called the Max 55HZ Hyper and 56SR respectively. These engines are much more powerful than the current 50 class engines. To prevent accidents or crashes, if you are planning to use either of these engines in the Hirobo Sceadu SDX, please read following notice.


1. Using the hardened drag bolt (Z-H2532-044) is recommended.

2. Do not use main blades which do not come with metal collars. We recommend using Hirobo main blades, which all have this.

3. Using upgrade main gear Z-H0412-169 (87T) or Z-H0412-291 (89T) is recommended.

4. Pitch up servos should have more than 9kg of torque.

5. Keep the main rotor speed under 2,000rpm.

6. If there is any vibration caused by parts becoming loose, stop flying immediately to check or replace these parts.


Before each flight, make sure to check the machine carefully.