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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 3 - Undercarriage

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It would be nice to believe that the models own undercarriage could take the load of a landing but with my flying its just not going to happen. The kits undercarriage is quite beefy but it has got weaknesses particularly around the wheel stub axles.

I looked at ways of strengthening the undercarriage but could see where breaks would occur. The decision was to either dispense with the models parts and make up a complete undercarriage to match it, or keep the kits parts and supplement it with something else.

I decided to make up a set of skids to act as the undercarriage fabricated from scratch using 1.5mm hollow brass tube and 0.3mm brass plate. The rational for skids as opposed to wheels is of course weight.

 
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I made up two individual skids one to act as the main undercarriage the other to act as nose undercarriage. I designed them both to protrude lower than the models undercarriage to protect them from damage. The main undercarriage was also designed wider than the models to provide a more stable stance during take off and landing. I examined the model to see where the undercarriage could be fitted / glued and made templates in tracing paper of the brass attachment plates.

I cut out the attachment plates from the brass plate with a pair of scissors as it is quite thin. Brass tube is easily bent into shape with a pair of pliers, this I did for each element of the main undercarriage.

 

 
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After cleaning the mating surfaces and applying a little flux I pre-tinned then soldered each piece together using a normal soldering iron which generates enough heat for these materials and gives plenty of control. When cooled the joints are very strong.

After washing off all the flux I gave everything except the gluing surfaces a coat of matt black, I will experiment with the colour to camouflage as much as possible in flight.

Prior to painting the fuselage I will glue the undercarriage in place with epoxy.

The portions of the undercarriage in contact with the ground will be covered with some silicon tube to provide a degree of cushioning.

 
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The nose skid assembly is stepped to fit inside the nose wheel retract housing, as this is glued to the underside of the cockpit it will be strong enough to take any impact from a bumpy landing

 
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In use the Heli sits in a slightly tail down stance a good deal less than the full size version, a little forward cyclic will no doubt be required during take off

 
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Using a similar technique and once the tail rotor had been positioned correctly I also made a tail skid as shown.