Hurricane Maintainence 300 flights

My flight logger of early setting with 7sA123, 600L 1600kv,14T, 61T/ 61T, 515mm carbon setting. Flight time 4.5 mins 3D. Voltage 20V, Amp 54A. My latest setting has power 1100W.

The swashplate has much free play at the central ball and the bearing. The central ball/hub freeplay is cured with thin CA (Do not do this if you are not sure). I am still thinking a non-destructive way to pull out the bearing.

The free play at the plastic tail grip (between bearings and the grip) is cured with some CA as filler. Actually, the stock tail set holds quite well even in funnel, fast backward and piro-flip.

Finally, I replace a Trex600 thrused tail grip and hub. What I need is a carbon tail blades to fit the stronger tail grip.

The copper tail slider hub needs replacement. The original copper slider has no thread. Since it still holds well in 3D, I do no change it.

The plastic main grip shows much freeplay and needs to put some CA at the outter bearing case to fill the gap before putting it back. The CNC rotor Hub shows some free play and needs some loctite. The dampener O-ring and spacer replaced.

Learning Autorotation

I learn it like this...

1) DO NOT USE THROTTLE CUT/HOLD HIGH IN THE SKY AT THE VERY FIRST TIME. You cannot manage that. THe first thing is to FEEL how good the heli float at a certain headspeed. So start at 1 foot hovering above ground. Flip the throttle hold, and FEEL how it float. Then increase the height to 3,5,7, 10 foot , until you get some confidence and the pitch movement. Also make sure your pitch curve is consistent in hovering mode and throttle hold mode.

2) Then feel the drop down speed. In normal mode (with negative pitch set to -4 to -6), fly the heli high up, then lower the pitch/ throttle stick down steadily (but not killing the motor.) Make sure you DO NOT set the ESC to VERY SOFT START as the motor cannot spool up fast enough (for a rescue) in case a total shut down. Practise it and see how fast the heli drop and LISTEN to the rotor gaining head speed . Do not land the heli yet. Throttle up again at around 20 foot high. This is to train you FEEL of dropping velocity.

Repeat and decrease the throttle up altitude.

3) Finally, you can land your heli , still in normal mode. Bit by bit, lower the altitude. When you get confidence, you can practise flipping throttle hold when the heli is 1 foot above ground , then 3 foot, 5.....until you can flip it high in the sky.

N.B. remember flip the throttle hold switch BACK may cause the heli to piro like hell because the tail rotor speed is not high enough to counter the main blade rotor torque.

Petshop Movie 1

A movie taken by Junita and Augustin.

Junita Violin

Hurricane EP550 New Frame

My old frame is >200 flights and is getting soft. Finally end its life on a crash from a low piro-flip. You can see the broken site and the surface area is less than 2mm x 8mm . This also contributes to the torsional weakness.


The new frame has new hex screws, better one way shaft bearing mount.


With 7s A123, the new fiber canopy fits perfectly without modification.

The new 61T is much harder and is not worn after 20+ flights.

Hurricane EP550 Delrin rear gear

In high power system setup (Align 600L/14T/7s A123/61T front/61T rear) , the stock main/rear gear cannot tolerate the torque.
This one already on 10 flights with 500mm woodies and remains its shape. You need to drill 3 holes to adapt the Gaui gear hub.

Iwill try 515mm carbon on it.

Upgrade Align trex600 swashplate to 3mm

The old version is 2mm ball screw which is prone to fail /fracture.

With the new 3mm Align ball screws pack, you can make an upgrade to the old version swashplate.

First drill a 2.5mm hole to prime a very precise straight hole

, then use a 3mm thread cutter 絲攻.

Loctite the new 3mm ball screws.

The process takes 15 mins.

Eagletree Airspeed Sensor

First tested in my Align F16. Not very impressive result as the F16 already has >50 flights and is almost on his retirement.

Lipo is a 60cycles lipo. BL is a modified 12pole 450TH with 1800kv.

Top speed just under 70km/ hr.