Kris...'s blog - RC Groups

You need to put up with a whole lot of ugly before the goodness starts happening.....

Mini-HowTo / Posted by Kris... / Apr 30, 2011 @ 01:53 AM / 7,790 Views / 4 Comments / Reply

THE KEYS TO 3D

- The lower (lighter) the wing loading the better: lower stall speeds and better knife edge capability. The ability to fly away from a botched maneuver is important.

- The higher the power to weight ratio the better: blast out of trouble or jump out of a hover.

- The more the control surfaces move the better: faster maneuvering.

- The larger the control surfaces the better: more control of the air.

- The more powerful the servos the better: to prevent flutter.

- Digital servos: precise motion throughout the range and tighter centers.

- The faster the servos the better: faster corrections.

- The larger the fuselage side area the better: better yaw control.

- The larger the size the plane the better: less sensitive.

- A computer radio: mix out quirks, switch rates easily using one condition switch.

- The correct amount of right thrust: the plane must go up straight in a hover.

- Lots of money: buy the best, stretch the envelope, have a backup.

- Nerves of steel: the lower the better.

- Bulletproof airframe: don't have a mechanical failure, especially servo linkages.

- Bulletproof engine/motor : hovering on the deck has an unhappy ending if the engine/motor quits.

- Rearward CG: flies inverted virtually hands off for better manoeuvrability.

- Extensive preflight: you can't afford a mechanical failure in the air which should have been caught on the ground.

A 3D Pilot Will:

Fly with awesome precision.

Fly a straight and level line,...Continue Reading

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Fly the rolling circle

Careful! / Posted by Kris... / Feb 13, 2011 @ 12:01 AM / 8,465 Views / 0 Comments / Reply

FLY THE ROLLING CIRCLE

A favorite among pilots, very difficult to fly well, rolling circles are one of the hardest stunts ever. The rolling circle is the only one maneuver that’s feared more than any other moves in the full-scale competition aerobatic world.

To explain further, rolling circles are a combination of a turn and a roll—a better term might be a “rolling turn.” There are different types of rollers, named according to the number of rolls in the turn, the number of degrees in the turn, and the direction of roll. However, there are so many factors required to do them well such as maintaining altitude with collective timing, applying constant roll rate, applying elevator whenever knife edge, and many more.

Basically, the rolling circle withstands a steady rate of turn, a steady rate of roll and a steady altitude.

One of the most challenging and admired maneuvers in all of aerobatics is the rolling circle. As a rule, you can achieve early success learning most maneuvers as long as you first understand the proper control inputs, and hand-eye coordination adds the final touches to perform the maneuver nearly perfectly. The rolling circle, however, is even more challenging in that it depends almost entirely on hand-eye coordination from the start. This article covers the steps to flying a rolling circle, but you’ll execute the actual maneuver by reacting to your plane.

Let’s begin by noting that using rudder in a rolling...Continue Reading

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2.4GHz and Battery Guide

Cool / Posted by Kris... / Feb 08, 2011 @ 11:15 PM / 6,976 Views / 0 Comments / Reply

The antenna position in (photo 1) has the antenna pointing straight up at the model which can result in signal drop outs as the antenna's tip is the weakest point.The best antenna position is to bend the antenna upward at 90˚(Photo 2) This guaranties you will be in the strongest part of the antenna radiation pattern unless you are directly overhead. The signal comes off the side of the antenna.

The radiation pattern is shaped like a big fat airplane tire with the antenna being the axle. The signal off the end of the antenna is inherently weak.
But above 30MHz is the horizontal polarization (bend antenna 90° to the side)

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Leeroy Mac and Tommy Dee - TOTAL FLYING !

Cool / Posted by Kris... / Nov 05, 2010 @ 10:58 AM / 7,096 Views / 0 Comments / Reply

Leeroy Mac and Tommy Dee Huck'it up ! UK Styley

Total Flying Episode 1 (9 min 7 sec)

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How to make a good doppler pass

Mini-HowTo / Posted by Kris... / Sep 12, 2010 @ 06:33 AM / 7,630 Views / 0 Comments / Reply

To make a good doppler pass you need a few things, here are some pointers on how to make good doppler passes.

1) First you want to keep the background noises as low as possible. Flying with a loud gas engine in the background, or adding music to a soundtrack, or talking close to the recording camera can make it difficult to extract the audio needed for doppler.

2) You must fly at a constant throttle setting. For doppler to work, the "source" frequency must remain constant. This means your rpm must be constant during the doppler pass. If you rpm drops (due to voltage sag or moving the throttle stick) then your "source" frequency changes as well and you will not get a valid doppler reading.

3) You MUST fly in each direction at least 5 to 8 times the distance from the microphone to the plane. If your plane passes 100 feet from the microphone, then you must fly at least 500-800 feet towards the microphone and 500-800 feet past the microphone. So the closer you are the better. I shoot for 50 feet and I often place an MP3 player in the flying field, set it to record audio, then fly over it as low as I can. This way you are not flying too close to your camera man. If you do not fly the required distance ratios, then you do not get a complete doppler shift, and you will rob yourself of speed.

4) Fly in a straight line coming to and going from the microphone. Do not pull up or turn. Always fly in a straight line.

5) Do not gun the throttle, you need...Continue Reading

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Multirotors.

Cool / Posted by Kris... / Sep 10, 2010 @ 09:36 AM / 7,513 Views / 0 Comments / Reply

My Crab MiniQuad by Bambucopter made of polycarbonate its bulletproof !

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How Electric Motors Works

Cool / Posted by Kris... / Sep 09, 2010 @ 08:36 AM / 7,941 Views / 0 Comments / Reply

How Electric Motors Work explains how brushed motors work. In a typical DC motor, there are permanent magnets on the outside and a spinning armature on the inside. The permanent magnets are stationary, so they are called the stator. The armature rotates, so it is called the rotor.

The armature contains an electromagnet. When you run electricity into this electromagnet, it creates a magnetic field in the armature that attracts and repels the magnets in the stator. So the armature spins through 180 degrees. To keep it spinning, you have to change the poles of the electromagnet. The brushes handle this change in polarity. They make contact with two spinning electrodes attached to the armature and flip the magnetic polarity of the electromagnet as it spins.

This setup works and is simple and cheap to manufacture, but it has a lot of problems:

The brushes eventually wear out.
Because the brushes are making/breaking connections, you get sparking and electrical noise.
The brushes limit the maximum speed of the motor.
Having the electromagnet in the centre of the motor makes it harder to cool.
The use of brushes puts a limit on how many poles the armature can have.

With the advent of cheap computers and power transistors, it became possible to "turn the motor inside out" and eliminate the brushes. In a brushless DC motor (BLDC), you put the permanent magnets on the rotor and you move the electromagnets to the stator. Then you use a computer (...Continue Reading

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