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Part 1 - Core
Part 2 - Tail
Part 3 - U/Carriage
Part 4 - Servos
Part 5 - Electrics
Part 6 - Flight Trials
Part 7 - Assembly
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Mil Mi-24V Hind E Helicopter - R/C Model Conversion

Part 4 - Servos

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I purchased a complete Hummingbird FP helicopter for the donor parts of rotor blades, rotor head, servos, gyro/mixer and receiver as it was cheaper than buying separates and I would have the bonus of a few spare parts for my other Heli.

The guys at Midland Helicopters had assembled and flight tested the Heli so I couldn't resist charging up the nickad and having a go. Almost to my dismay it flew every bit as good as my heavily modded version although the Century transmitter has a very heavy feel on the cyclic. Obviously the hours of practice gained since my original purchase have stood me in good stead, being able to fly this Heli straight out of the box is proof of that.

All that said it is evident that the Hummingbird FP is a good choice as a first radio controlled helicopter.

 
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The servo's mount using double sided tape, I trimmed down the top and bottom mounting lugs to give as much clearance as possible. I made sure I was happy that the servos are not going to come away from the mounts, I used a good quality mounting tape.

I have made no attempt to purchase smaller servo's than standard, no doubt this could be done with the result of less clearnce required.

 

 
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The Aileron servo requires a fair amount of clearance. As can be seen in the picture it exits just above the models left hand exhaust outlet. I measured carefully then cut out with a Dremel and finished to size with a flat needle file.

I will paint the servo and horn the same colour as the fuselage to camouflage it, in addition I will fit as much of the actual exhaust as possible to further hide the servo. I believe in flight it will look fine.


 
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The Elevator servo also protrudes slightly beyond the fuselage.

Again I marked carefully, cut out with a Dremel then slowly enlarged the opening taking time to trial fit the two fuselages together until I had just enough clearance.

A little crude I know but when painted I dont think it will be too noticeable.

 
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The Elevator servo horn link required just a small amount of clearance at the rear of the rotor housing which I simply filed to shape.

Both servos operate freely to their full throw.