23-02-2013, 09:40 AM
AEROMODELLING
AEROMODELLING.ppt (Size: 1.1 MB / Downloads: 142)
INTRODUCTION
Aero modelling is the one of the finest hobbies, which is very popular world wide among people of all ages and professions. It has often been the starting point of many Pilots and Aeronautical engineers. “It is a hobby in which a cadet learns to build up the model of actual aircrafts which are unable to carry persons and used for sports purposes”.
WHY AEROMODELLING STARTED IN NCC
The aim of introducing Aeromodelling in the NCC curriculum is to increase the air-mind ness in the youth of our country. If taken in right lines, it can be extremely thrilling for all.
By constructing the models by one’s own hands, one can understand the various principle of flight and problems of construction.
MATERIAL USED IN AEROMODELLING
DOPE
Dope is liquid (celluloid + Thinner).Dope is used for following purpose:
For air - proofing, water proofing.
For tightening the surfaces skin by plasticising effect.
For making the model hardy and less vulnerable to weather conditions.
TOOLS
Very few tools are required for Aeromodelling. Engine and other accessories are available ready made, the tools which are needed are for the construction itself.
TYPES OF AERO MODELS
There are a number of varieties of aero models, which are classified according to the role and utility of the particulars type.
STATIC MODEL
These are the miniature replicas of the original, full sized aircraft types and the best skills of the Model Makers. The scope of this particular type is boundless and depends upon the ideas of the individual concerned.
POWERED MODEL
The models which are flying with the help of engines and with propellers are power models.
1. Free flight Models: These require large and open fields to perform. They are usually hand – launched. These models are flying in the air freely without any control.
2. Rubber Models: These models get their power to fly from rubber strips. One end of the strip is attached to the fuselage as an anchorage and the other end is tied to the propeller hook. The propeller is now wound a number of given turns and when the models is launched the rubber unwinds itself. Spinning the propeller and propelling the model forward.
3. Control line models: This type model is controlled from the ground by its ‘pilot’. Two wires are attached to the model and terminate to the other end at a ‘control line handle’ which is held by pilot. These wire control the up and down movement of elevator or flaps of a model. By pulling handle up and down the elevator of the models moves up resulting in the model climbing. Similarly by pulling the handle down the elevator of the model moves down resulting in the diving attitude of the model.
PARTS OF DIESEL ENGINE
Crank Shaft.
Crank Case.
Propeller Nut.
Propeller Washer.
Propeller Hub.
Fuel Needle (Carburetors)
Back plate.
Back Plate Screw.