Monday, July 14, 2008

Make a flying model aircraft

Please go thru the link.. It has visuals to prepare you to make a model aircraft and some basic of areomodeling.
 

Friday, May 16, 2008

Advance Flying Tricks

Tired of flying straight & level ? Below are links that will describe in detail all of the wildest aerobatic maneuvers for you to try!

 

General Comments

This is a list of areobatic figures that have common names. Some of these were invented during aerial combat in WW I. I have included a short verbal description and the IAC symbol for each basic figure.

The symbols for the figures follow the rules of the FAI for depicting aerobatic figures. The figure starts at the small solid circle and ends at the vertical bar. All aerobatics figures start and end from horizontal lines in either upright or inverted flight. In aerobatics competition, most figures can be entered and/or exited from either upright or inverted flight. This affects the difficulty numbers for the figures. In general, the altitude at which the figure is entered does not have to be the same as the exit altitude. Exceptions are for instance the Cuban Eight, all full loops (regular loop, square loop, etc). In cases where the entry and exit lines have to be the same altitude, they are drawn slightly separated to better show them.

The elements used in these figures are horizontal, vertical and 45 degree lines. These describe straight flight in these directions. Solid lines describe upright flight, dashed lines describe inverted flight. Parts of loops connect these line segments (see e.g. the Humpry-Bump). Rolls in 1/4, 1/2, 3/4, etc increments up to 2 rolls can be added to the lines.

The looping portions in almost all figures have to have the same radius in all parts of a figure. For instance the quarter loops going into and coming out of a hammerhead have to have the same radius. There are some figures where this does not apply completely.

Rolls on vertical lines and on 45 degree lines have to be centered on this line to score well. Any deviation from the center results in a downgrading during a competition.

 


Rolls

Rolls can be added to most other figures to increase the difficulty factor of the figure. There are two basic types of rolls: slow rolls and snap rolls (flick rolls in european parlance).

Slow Rolls

1.)  Roll      2.)  Point Roll 

Slow rolls have to be flown normally on a straight line (exception is the avalanche). The roll rate has to be constant and the longitudinal axis of the plane has to go straight. This requires constantly changing rudder and elevator control inputs throughout the roll. Hesitation or point rolls include stops at certain roll angles. The number on the base of the roll symbol describes the number of points the roll would have if it were a 360 degree roll. Allowed are 2 point, 4 point and 8 point rolls. The fraction on the arrow of the roll symbol describes what fraction of a full roll is to be executed. If no points are specified, rolling is done without hesitations. If no fraction is specified, a roll symbol that starts at the line specifies a half roll (see description of the Immelman). A roll symbol that crosses the line specifies a full roll (first figure). The second figure shows the symbol for 2 points of a 4 point roll (adding up to half a roll) from upright to inverted flight.

Snap Rolls

3.)  Snap Roll      4.)  Outside Snap Roll 

Snap or flick rolls also have to be flown normally on a straight line. A snap roll is similar to a horizontal spin. It is an autorotation with one wing stalled. Figure 3 shows the symbol for a regular snap roll, figure 4 for an outside snap. In the regular snap, the plane has to be stalled by applying positive g forces. In an outside snap, the plane is stalled by applying negative g. In both cases rudder is then used to start autorotation just like in a spin.


LoopLoop

This is one of the most basic maneuvers, but not easy to fly well. It has to be perfectly round, entry and exit have to be at the same altitude. The difficulty in flying this manuever well is in correcting for effects of wind drift. In competition, it helps if you don't have to fly first, so you can watch what your competitors are doing and judge the wind drift that you have to take into account.

The maneuver starts with a pullup of about 3 - 4 g. Once past the vertical, the back pressure on the elevator is slowly relaxed to float over to top of the loop to keep it round. Past the top, the back pressure is slowly increased again throughout the back part till horizontal flight. The plane has to stay in one plane with the wings orthogonal to the flight path. Rudder is used to maintain the plane of the figure and ailerons are used to maintain the orientation of the wings.


AvalancheAvalanche

This is the basic loop with a roll (usually a snap roll) at the top of the loop. The roll has to be centered at the top of the loop.


Square LoopSquare Loop

This is a variation of the basic loop. The two vertical lines and the horizontal line on top have to be of the same length. The exit line at the bottom has to be at least as long as the other three sides. The quarter loops that connect the four sides have to have the same radius at each corner.


Eight Sided Loop8-sided Loop

This is another variation of the basic loop. The two vertical lines, the 45 degree lines and the horizontal line on top all have to be of the same length. The exit line at the bottom has to be at least as long as the other seven sides. The eigth loops that connect the eight sides have to have the same radius at each corner.


ImmelmanImmelman

The figure starts with a half loop to inverted flight. A half roll then results in horizontal upright flight.
This is one of the maneuvers that have been used in WW I to reverse direction. This maneuver does not preserve speed and altitude. It trades speed for altitude.


Split-SSplit S

The figure starts with a half roll to inverted followed by the second half of a loop downward.

This is another maneuver to reverse direction. This one, like the immelman, does not preserve speed and altitude. In this case it trades altitude for speed.


Half Cuban EightHalf Cuban

Five-eighths of a loop to a down-line at a 45 degree angle. The plane is inverted at this point. Centered on this downline is a half roll from inverted to upright. A pullout to horizontal completes the figure.

This is another one of the maneuvers that reverse direction. The downline can be used to adjust the altitude and speed at the end of the figure.

Cuban EightCuban Eight

Two Half Cuban Eights can be combined to form a Cuban Eight or Lay-down Eight. In this figure in competition the two looping parts have to be flown at the same altitude with the same radius. The exit has to be at the same altitude as the entrance to the figure.


Reverse Half Cuban EightReverse Half Cuban

This figure starts with a pull to a 45 degree up-line. Centered on this line is a half roll from upright to inverted. Five-eighths of a loop complete the figure to horizontal flight.

This again is one of the maneuvers that have been used to reverse direction while preserving altitude and airspeed.

Reverse Cuban EightReverse Cuban Eight

Like the Cuban Eight, a Reverse Cuban Eight can be formed by flying two Reverse Half Cuban Eights back to back.


Inside-Outside EightInside-Outside Eight

This figure is similar to a Full Cuban Eight, but it does not contain any rolls. The second loop is an outside loop. Again, the two loops have to have the same radius and have to be flown at the same altitude. Entry and exit have to be at the same altitude.


HammerheadHammerhead

A quarter loop into a vertical climb. When the plane stops climbing, it pivots around its vertical axis (which is now horizontal).The nose moves in a vertical circle from pointing up through the horizon to pointing down. After moving vertically down to pick up speed again, the maneuver is finished with the last quarter of a loop to horizontal flight. This figure can have optionally rolls on both the up-line and the down-line.

The quarter loop is flown just like the first part of a loop. When the plane is vertical, the elevator backpressure is released completely. During the vertical line up, some right aileron and right rudder is needed to maintain the vertical attitude because of the engine torque and p-factor. When the plane has slowed enough, full rudder initiates the turnaround. It is followed by right-forward stick (right aileron and forward elevator) to keep the plane from torquing off. The pivot is stopped with opposite rudder when the nose points straight down. When the pivot is completed, the ailerons and rudder are neutralized. Elevator and rudder are used to keep the nose pointing straight down. Thje pivot must be completed within one wingspan. Rolls on the downline require only aileron input if the plane is trimmed correctly.

This maneuver is sometimes called a hammerhead stall. This is not an accurate name because the airplane never stalls. The airspeed may be very low, close to zero, but since there is now wingloading during the turn-around, there is no stall (at zero g wing loading, a wing does not stall). The plane is flying throughout the maneuver with all the control surfaces effective (even sometimes only marginally so).

This also is one of the maneuvers that have been used to reverse direction while adjusting altitude and airspeed by changing the length of the down-line.


Humpty-BumpHumpty-Bump

The figure starts with a quarter loop to a vertical climb. A half loop then results in a vertical down-line. The figure completes with another quarter loop to horizontal flight. The looping part on the top of the figure does not have to be the same radius as the two other looping portions (the quarter loops going into and coming out of the humpty). Again the figure can have optionally rolls on both the up-line and the down-line.


Competition TurnCompetition Turn

Competition turns are not the coordinated maneuvers that you use in normal flying. In a competition turn you first roll to the desired bank. It has to be at least 60 degrees. My experience shows that the steeper the bank, the better the scores. I try to get close to 90 degrees bank. Once the bank is established the turn is started. The plane has to maintain a constant bank and altitude throughout the turn. At the end of the turn the turn is stopped and then the wings leveled for horizontal flight. The example shows the symbol for a 270 degree turn.


Rolling TurnRolling Turn

This maneuver combines a turn with rolls. The example shows a 360 degree turn with four rolls to the inside. The plane has to maintain a constant roll rate, constant turn rate and constant altitude throughout the rolling turn. This maneuver is quite difficult to fly. It requires constantly changing inputs from all three controls (rudder, aileron, elevator).


Spin

Spin Inverted Spin 

Spins also are aerobatics competition maneuvers. The two figures show a regular and an inverted crossover one turn spin. Spins come in 3/4, one, 1 1/4 and 1 1/2 turns.

During spin entry, the plane has to show a stall break, followed by the auto-rotation. The rotation has to stop exactly after the specified number of turns. Once the rotation has stopped, a vertical downline has to be established.

In a crossover spin, the plane is first stalled upright. At the stall break, the nose is pushed forward to get into an inverted spin while maintaining the stall. The inverted spin is then completed as it would be for an inverted spin with entry from inverted flight.


Chandele

The Chandele is not a figure for aerobatics competition. On the FAA power commercial pilots test a Chandele is defined as a maximum performance climbing turn through 180 degrees while maintaining a constant turn rate. The idea is that this is a "plan ahead" maneuver. You first establish a medium bank depending on the performance of your aircraft. Then a smooth pullup is started. The angle of bank stays constant during the first 90 degrees of turn, while the pitch angle increases steadily. At the 90 degree point the plane has the maximum pitch angle which should be close to the critical angle of attack. During the second 90 degrees of turn, the pitch angle is held constant, while the bank angle is smoothly decreased to reach 0 degrees of bank at 180 degrees of turn with the airspeed close to the stall speed. The plane should not settle during the last part of the maneuver and the recovery. The decreasing bank angle durning the second half of the Chandele will maintain a constant turn rate together with the decreasing airspeed. The turn needs to be kept coordinated by applying the right amount of rudder. A Chandele to the left is quite different than one to the right because of the ever increasing amount of p-factor in the second half of the maneuver.


Wing OverWingover

The Wing-Over is a competition maneuver in glider aerobatics. You pull up and at the same time bank the plane. When the bank increases past 45 degrees, the nose will start to drop while the bank keeps increasing and the plane keeps turning. Halfway through the maneuver, the plane has turned 90 degrees, the fuselage is level with the horizon and the bank is 90 degrees. The plane is above the original flight path. The nose then keeps dropping below the horizon and the plane keeps turning, while the bank is shallowed. When the bank drops below 45 degrees, the nose is pulled up towards the horizon and the plane reaches horizontal flight with wings level after 180 degrees of turn. At the completion of the maneuver, the plane is at the same altitude as on entry and flying in the opposite direction.


Lazy Eight

Like the Chandele, the Lazy Eight is not a competition maneuver but is required for the power commercial pilot test. The aerobatics version of the Lazy Eight is two wingovers back to back. The FAA commercial pilot version is similar but the maximum bank is only 45 degrees instead of 90 degrees. The name Lazy Eight comes from the fact that the nose of the airplane is following a figure 8 on its side on the horizon


Barrel RollBarrel Roll

The Barrel Roll is a not competition maneuver. I have tried to give a description of a Barrel Roll without using my hands, but have failed miserably so far. Maybe somebody else has a good verbal description that doesn't require hand waving.

Float Jet take off

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Float Jet

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Float Chopper

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Float Plane

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Float plane

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Model Float Planes

GWS P-51D Mustang Park Flyer ARF w motor WS 34"

GWS Beaver Park Flyer ARF with motor WS 39.8"

Foat Model

Indian RC Form Link

http://www.indiarc.com/cgi-bin/forum/YaBB.pl

The Electric Hangar @ Indian RC Portal

This guy has a splendid collection of planes in his hangar watch for some given below

 
The Electric Hangar
PT17PT 17 Biplane

Built from the GWS kit. This plane was a very nice and peaceful flier. Powered by a brushless 400 motor and a 3 cell pack this turned into a blast. It went into a nose dive when the ESC shorted suddenly inflight. I still have it in the hangar and will resurrect it sometime. Read more

Videos


Tiger Moth Biplane

This is a beautiful flier and induces a lot of confidence in the flier to fly as they please. Flies Inverted very well. Read more

Videos

Spitfire

This was a GWS kit that was first powered by a speed 400 motor where it flew 'ok'. It was later changed and powered by a cheap Tower pro brushless and a 7x6 prop with 3 cell lipo pack. This changed the plane into a rocket. When I eventually retired the plane into the ground its fuselage broke into 2 parts but its repairable. I am letting it hang in my hangar for a new day. Read more

 

Bae Hawk

This is built from the Ultrafly Kit. I got it at a bargain at towerhobbies. Powered by a brushless motor again it was a fiend for speed. The only draw back was it needed elevator mixing with throttle for reloiable flying. I got some good flights out of it. It is quite sensitive to nose weight. Fast plane ! Read more

 

Test Flight Video

Twinjet

This one is a beauty and one of my favorites. I traded the 2 brushed motors it came with for a 300W brushless inrunner and it give a super turn of speed. Flies with Elevon mixing and powered by a A123 4 cell pack it makes you look like a pro :) . If you are looking for speed this one gets my vote. Read more

Video1 - Video2


Easystar
The best plane ever for beginners. I use a brushless for it and it simply is a plane that will fly when all others are down due to lack of space or high winds. With its pusher prop it takes a lot of beating.

Formosa Electric

This one was a surprise out of the box as it was BIG compared to all the previous electric kits. Its about 48" wingspan and long. Weighs about 1100 gms with a good capacity battery pack. A 25 sized motor is the best for it. Read more

Video

Ultimate Biplane

A Beauty from Ultrafly and capable of 3D moves as well as aerobatics. This one was a fantastic flier. Sold to a friend who is enjoying it now. Read more

Video


P 38 Lightning

Awesome looking scale bird. My first twin plane powered by 2 identical brushless motors and 2 ESC. Have got some flights out of it. Really looks very nice on the ground and in the air. Quite well sized at 48" WS. Read more

Video1 - Video2

 

Parkjet Gripen

I got into the parkjet mode for this one and built this scratch out of depron or bio foam as it is known in India. Dint fly all that well for me but looks fantastic. I still have it put aside and will get back to working on it sometime. Read more

Video

 
   
The Glow Hangar
Edge 540 v2
This was a beautiful kit I made using autocad and laser cutting. I made 2 versions of this and i think they turned out nice. The fuselage was a little thin compared to the orignal one though. The edge was a little prone to tip stalling but for a first plane design it was really satisfing to build and flying.
Extra 300 .90 size

This was my 2nd laser cut and cad designed kit. I still fly this plane and its really a very good flier. Its in its 2nd life with a new covering thats more jazzy. The engine is ASP 90 2 stroke that has done pretty well. Uses 5 standard servos. I must say this is the best design and built kit from me. Read more

Video1


Extra 300 .46 size

This was my 3rd design and laser cut kit. It was scale and flew very well. Powered by a .46 engine it did all the aerobatics in the book but no 3D. The plane was covered with Vinyl and lamination film on the wing. It is still flying with a friend. I built the cowl, canopy and landing gears from scratch. Quite a looker ! Read more

Video

Yak 54 .50 size

A recent addition to the stable. Its an ARF. The plane is quite good looking and I use an OS 70 on it which is to be replaced by a Magum 91 4 stroke engine for more 3D ability. It shows quite some potential for doing the tricks in the book. Read more

Video 1 - Video 2

Pitts Bipe

This ARF beauty I got it with me from the USA. Sweet looker and not too big in size. I used an OS 70 4 stroke on it and it flies awesome. Really looks very nice in the air. I have changed the engine to a OS 46 Fx and its being tested with that. Read more

Video