Hello FT community, I created this system to hold things to our planes and then release them, I find it very useful and I wanted to share it with all of you.
For a long time I have been thinking about how to make a system to join two aircraft in a robust way so that they do not move with respect to each other and that the servo does not suffer or get stuck if what it holds is too heavy. I am doing an experiment to launch 2 kg space shuttles from an aeroplane and I need a reliable and compact system.
The first model I made had two claws that held the bottom, and opened with a servo, but sometimes they opened in flight and didn't hold well.
Then I made a version in which the only moving part is the servo. What holds the piece that is released is fixed and when it slides backwards by air resistance or gravity it is released, in that way it is perfectly held without moving anything until the servo pulls out the pin and the mechanism is released. Moreover, no support is needed to print it.
this is the 3d model in thingiverse https://www.thingiverse.com/thing:4552053
It is super reliable, cannot be released unintentionally, it is very small, and it can be put on the top of an aeroplane to launch it from another one, and it is perfectly flush so it is aerodynamic.
It has a small spring to help release it but it is also not totally necessary, without it it also releases quickly.
In the minute 5:25 of this video you can see the mechanism in action, this weighs 600grams but I have released things up to 1.2kg and it works perfectly.
Apart from being used to link two planes together I also thought it could be used for other projects such as making a biplane that takes off easily and releases a wing in mid-flight and becomes a much faster monoplane. This is where everyone comes up with their own crazy inventions.
That's all in this article, I just wanted to share this design because I think it's very useful for the model plane community.
Thank you very much for reading me and I hope you find it useful.