Wonwings diary-Painting a full sized aircraft.
We all know about painting our models but how many of us consider the implications of painting a full sized aircraft ? well here are a few facts that will make you think the next time you pick up your airbrush or paintbrush to apply some colour to your miniature.
The first thing to consider when painting something say the size of an airliner,or even a smaller aircraft for that matter is the weight,if you have ever lifted a gallon of paint across the room you will know what I mean ? paint in any form is heavy,and weight is not only detrimental to the performance of the aircaft but is also lost revenue for the airline as well,there are laid down stipulations about just how much paint can be applied to the aircrafts exterior and any build up can be detrimental in many ways,every time that the aircraft comes from the paint shop then it needs weighing,specialist companies travel around the country calculating the aircrafts weight and balance,this is all part and parcel of the machines certificate of airworthiness,although there are no aircraft weighbridges ( well at least not to my knowledge ? ) the method is to place the aircraft onto special jacks and the data read off and calculated.
We mentioned the build up of paint,well every now and again the paint needs stripping off,this an be a messy and expensive process and it is important that any detrimental paint strippers or specialised liquids are removed properly as they can continue to eat into the alloy skin of the structure if not neutralised by the washing down process.
Once the paint has been removed then it is time to treat the alloy of metal aircraft with what is called a self etching primer,this is normally a two part acid based material that slightly etches into the metal providing a suitable key for the final paint,not only must it be applied but the top coat needs to be put on within a set time period otherwise it will not key properly.
Not all paint is sprayed these days,health and safety requirements have led to other methods of application especially in the armed forces where many aircraft are handled daily,more use of paint rollers is being used,similar in appearance to your domestic roller but of a much higher quality to give a smoother finish,now here is a fact did you know that there are more aircraft refinishers in the R.A.F for example than any other trade ?
Gone are the days when roundals and sign written methods were used on roundals,signs and instructions etc,with the advent of pre-computer cut decals this has changed the system entirely,they not only look very neat,but are light in weight and can be easily removed with an heat gun should they need to be replaced.
It is a costly and time consuming process of painting any large machine,methods have changed considerably but the task still requires lots of manpower and is labour intensive,so next time that you reach for that small tin of Humbrol think of how the job is done on the big stuff.