Yup they are 'Clear' coke bottles and they work

I would not reccomend an all clear airplane unless there are some contrasting colors for visual orientation. Here is another of mine a small electric with one wing completely clear and another a color clear. I would not reccommend this either as its quite difficult to maintain orientation.

Also another of mine that is a vintage RC type airplane flown on just rudder and throttle it has no orientation problems with clear wings and some black. the solid balsa fuselage is also clear monocoat.

Last picture are three of my airplane that actually are trainers covered in various color clears. It includes a Senior Kaydet, Seniorita and a Senior Telemaster.

John