Tag Archives: Balance

Building 4 Star 60 Day 48: Stabilising Wires Installed

Stabilizing Wires Installed

Though my plane according to the plans was complete, Monday I truly completed my aircraft!

Outside of the plans, based on club members experience, I added support wires to the tail.  You can see them installed in the featured image above.  The reason for this addition is that a known flaw in the design of the aircraft is the weakness of the fin.  If you were just flying in circles and figure eights you would be just fine but as soon as you started performing loops and rolls you would have a problem.

That problem is that the forces applied to the fin during these maneuvers would cause the tail to twist making the aircraft unstable in the air.  This instability, and perhaps damage, leads to a lack of control and I believe even the potential for the fin to break.

The wires were created by John based on the ones installed on his 4 Star 60.  He sautered the ends to bolt to the surfaces onto the wire.  The are adjustable for length as you want to make sure they are at about the middle of the top of the fin as well as the middle of the outer edge of the stabiliser into solid wood, but not to close to the edge to ensure a firm hold.

Doing one at a time you line it up and mark where the holes need to go into the stab and the fin.  Adjustments needed to be made on the ends to ensure they sit flush with the surface of the aircraft.  You then drill out the holes, ensuring you go through in a straight line as you don’t want to be at an angle.  Next you put the screws through (screw it in once required) and then put a locking nut on the screw through the stab.  Can leave the one through the fin for now.

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Building 4 Star 60 Day 47: Balancing & Weight

Finished Plane Front View

Tuesday was the day everything came together and I my aircraft was fully assembled.  Previously in the week Peter & John balanced my plane to determine how much weight was required.  The aircraft was quite tail heavy.  Need to remember that as you move away from the center of gravity (CG) the effect of 1lb of weight is compounded.  This means that even though the engine, wing, battery, etc. is all up at the front of the plane the tail still wanted to ‘sink’.

In order to counteract this John & Peter determined how much weight was required to place up in the nose so that the aircraft is actually a little nose heavy.  They determined the weight required and already had the one side of the piece of metal sanded and a piece cut out for the drain hose from the engine to go through allowing the fuel to exit instead of pooling on the bottom.  I then drilled two holes into the piece of metal.

Checking Balance With Weight Installed
Checking Balance With Weight Installed

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