Steps to FLY

Now that you have completely built your Model, it is time to hit the Playground and FLY!!!  Watch the Video for steps to fly : http://youtu.be/LLo2x_yhD1Q

To fly the model, we need to follow 3 Basic Steps everytime we build a new model.  These 3 steps will help our model to balance well and FLY well.

STEPS to FLY:

1. Centre of Gravity (CG) Test

2. Chucking (or) Gliding Test

3. 100 winding of rubber motor Test

All the Above 3 Tests are also demonstrated LIVE in the Videos as well. 

The link for the video is: http://youtu.be/LLo2x_yhD1Q

Watch the Videos for visual understanding of the steps explained below.

All the 3 Steps need to be performed one after the other in the order mentioned only on a fully Built, ready to Fly model.  "Fully Built - Ready to FLY" means, the model is fully built, covered with paper, landing gear attached, rubber motor fixed and the propeller nose block fixed.

1. CG Test: The CG test is performed to ensure that the balance of the Airplane is correctly set.   To do the CG test, first we need to look at the Plan Drawing Sheet.  In the Plan Drawing Sheet for the airplane you have built, there will be a point marked in Black Arrow and mentioned as "CG/ CG BalancePoint".

At this point under the wing mentioned as CG Balance Point in the Plan Drawing, try to balance the Aeroplane.  When you do this, for a correctly balanced airplane the Airplane's Nose and Tail should balance in such a way that the Airplane's Nose is slighly facing down (watch video). 

In the CG Test, What if the Nose is not pointing slightly down, but pointing upwards:  In this case, the Airplane is said to be Tail Heavy.  To adjust this, we need to add some weight to the Nose of the Airplane till we get the Nose of the Airplane to point slightly downward.  We can use china clay or small nuts as a weight (watch the video illustrations)

In the CG Test, What if the Nose is pointing very much Down with the Tail pointing very much Upwards:  In this case, the Airplane is said to be Excessively Nose Heavy.  To adjust this, we need to add little weight to the Tail section of the Airplane.  But all the HobbyScience airplane kits are designed in such a way that none of our airplane's will be Tail Heavy!!

Once the model is balancing with the Nose pointing slightly down, then the CG Balance is supposedly correct for your Airplane!!

Note: For the Beginner Model "LITTLE FLYER" there is no need to add any weights.  The correct CG Balance should be achieved by sliding the cabin front or back.   Sliding the cabin backward is equal to adding Nose Weight and solves the problem of STALLING.  Sliding the cabin forward is equal to adding tail weight and solves the problem of DIVING.  Watch the video specific to LITTLE FLYER.

2. Chucking or Gliding Test:

After the airplane is Balancing int he CG Test properly with the Nose slightly down, we need to perform the Gliding Test.  In the gliding test, we are trying to check our airplane's gliding path. 

For the gliding test, hold the airplane under the CG location and launch the plane parallel to the ground, preferably when there is no wind.  The lauch angle should not be upwards or downwards, but at your EYE Level when you stand upright.  For launching correctly, stand upright and target a distant point at your eye level and then launch the airplane with moderate speed towards the distant target point in a moderate speed.  Do not violetntly throw the model at a high speed, as it will damange the model and the airplane may get broken.

Once launched, if the model is correctly gliding, then the airplane will smoothly fly parallel to the ground and gradually come down to the ground with the landing gear touching the ground first.  This is the Ideal gliding that we need to get from this Test.

2a. What if the airplane upon launching climbs up with the nose pointing upwards and then stops in the air and then falls?   This Behavior where the airplane is climibing upwards and stopping is called as STALLING.   In this case, the airplane is flying with a tail heavy attitude.  So we need to add little bit of weight to the nose, until the airplane glides and floats parallel to the ground.

2b. What is the airplane upon launching, directly hits the ground nose first in a diving motion?  This Behavior where the airplane is immediately Diving Nose First into the ground is called DIVING. In this case, the airplane is flying with very much high NOSE HEAVY attitude and we will have to add little weight to the tail section of the airplane.

After adding weights based on the problems observed during the Gliding Test, again launch the airplane at a calm windless time, parallel to the ground.  Now the airplane will glide smoothly parallel to the ground and gradually come down (watch the video)

Note: For the Beginner Model "LITTLE FLYER" there is no need to add any weights.  The correct CG Balance should be achieved by sliding the cabin front or back.   Sliding the cabin backward is equal to adding Nose Weight and solves the problem of STALLING.  Sliding the cabin forward is equal to adding tail weight and solves the problem of DIVING.  Watch the video specific to LITTLE FLYER.

3. 100 Turn / winding of rubber motor Test:

After completing the CG Test and Gliding Test and getting the desired outcomes from the two tests, it is time to apply the power of the rubber motor to the airplane.  But before giving full power, it is always better to give 100 turns / windings of the rubber motor to the propeller.  After winding the propeller for 100 turns, gently launch the airplane at your eye level parallel to the ground.  The plane should now fly with the power from the propeller and will fly till the rubber motor unwinds. 

Now gradually increase the number of turns of the rubber motor and happy flying.

Note: Please observe the maximum turns for your airplanes as mentioned below and do not exceed the maximum turns, otherwise the rubber motor will break.

Model Maximum Turns of Rubber Motor
Street Sparrow  200 Turns
Little Flyer  350 Turns
Cessna  350 Turns
Moth  450 Turns
Ornithopter  45 Turns