the Lado electric Geardoor are the first gear door design for rc models in the world.
they're able to open gear door and airbrakes on your models
they're so simple to use, you mount them in your airplane and that's all, no end point to set up as soon as the gear door was open or close they'll stop themselves. if something comes to lock the m during travel, they'll stop too without destroy anythings.
the best solution for your scale models.
what you could do with:
power supply: 4,8v to 7,5v
open time: 3s( depend of your gear door)
design to be mount with an 3mm pushrod( not provide)
sold by one