Servo Pushrod Connectors and Control Surface Horns

thingiverse

Various servo pushrod linkages and surface control horns I use when building radio control planes. These save me a lot of money on having to buy these bits and pieces, don't take long to print, and seem to perform just as well for cheap foamies. I've used them in aircraft up to 800 grams without problems. There are 3 versions of the servo pushrod connectors. They all glue onto the ends of different sized rods. The holes for the rods you connect them to come in 3.2mm, 2.5mm and 2.2mm sizes. I use 2.5mm for the cheap '2mm' carbon fibre I get from hobbyking, 3.2mm for bamboo barbecue skewers that are even cheaper, and 2.2mm for anything that's really 2mm in size. You need a little extra space for wiggle room. I use superglue to glue the pushrods into the 3D printed pushrod connectors and that works fine. Bamboo, carbon fibre and 3d printed plastics all stick well with superglue. I use 1mm wire to push through the holes on the parts which I also glue in place with superglue (on the outside so as not to glue the parts together) then cut short. This makes some of the parts none removable unlike the bought ones that unclip so I just print spares and cut them off. https://www.ebay.co.uk/b/1mm-Jewellery-Wire/150059/bn_7023563447 Search for '1mm jewellery wire'. The control surface horns come with backing plates which you may or may not need. If using with wood control surfaces you may just be able to srew the horns down into the wood with wood screws. If using with a foamie you may want to run plastic bolts all the way through predrilled holes then use the backing plates with plastic nuts to hole things in place. The holes are sized for M3 screws or bolts. Here are links to the tinkercad designs so you can make your own versions. This is especially useful for the control horns as you can create versions to fit different wing sweep angles. There are a few different angles I have used in the link. https://www.tinkercad.com/things/8zU1hkOXUiV (Control surface Horns) https://www.tinkercad.com/things/lfowoVcudSH (Servo Pushrod Connectors)