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Air Scoop Newsletter
February 2017
Just a couple examples above of some new Quads at Wednesday night indoor flying at the Longfellow Gym.

On the left is an example of a pilots FAA registration number mounted on RC quad. This number needs to be seen from the outside without taking anything apart. FYI
New Members
Ken Johnson and John Dees, who have just joined the Club recently. Welcome to Club guys!
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Above left is a diagram of a quad showing the relative rotations of each motor. On the right is the make up of the parts you need to build a home made quad. There are many sources of quad kits and sometimes you have to search You Tube to learn how to complete the projects and program the flight controller etc.
Click here to see an interesting view of the wind produced by a quadcopter.
For those interested in the math of how a quad works, click on this link. pretty technical stuff.
Click Here to see a group of
Click Indoor RC planes strut there stuff.
Click here to see a single Click R2 airplane flying inside a gym.
Fingers and Propellers Don't Work out too well together
Submitted by Dan Horinek, Safety Officer
      Pic and Article by John Sandy
Hi all, last week we had an "incident" at the field that was fairly serious, has happened in the past and, unfortunately, I'm 100% sure it will happen again! What I'm referring to are prop strikes to different parts of our anatomy, mainly fingers and hands! The incident involved myself while assisting Dave Grosse getting his Eagle 56 ready for winter operations on snow! The temperature was around 15 degrees and we were having problems getting his engine started and keep it running, while adjusting the high speed needle valve I rotated my wrist (big mistake) putting my little finger on my right hand in airspace occupied by a high speed propeller. The end result of invading said occupied airspace was extremely quick removal of a strip of meat roughly 3/32" deep by 1/2" wide and 1 1/2" long. At this time it's too early to know if there is nerve damage and how well my "pinky" will bend in the future but I'm hoping for the best. Additionally, I found out that there are multiple arteries in each finger that bleed like crazy when sliced and diced! The cause of the incident was entirely the fault of the pilot losing "presence of mind" and could have been avoided by simply adjusting the needle valve from behind the wing trailing edge. If you do this one little thing you accomplish two things, (1) you don't expose your whole hand to a prop strike since your using your finger tips and not rotating your wrist to turn the needle valve, (2) it puts your body behind the propeller arch rather than in-line with it, I've seen both propellers and spinners come apart during high speed run-ups. Also, when making the adjustment it would be safer to bring the engine or motor down to an idle, make the adjustment then run it up. After it was all said and done the injury was quite painful, required 6 sutures and will require about a month to fully heal. You can be sure I've learned my lesson and won't take short-cuts in the future! Fly safe!
FCC License required for high powered 5.8 GHz FPV
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In the world of FPV model flying, the use of a video transmitter mounted on the model to transmit a video signal from the camera to a monitor or set of goggles can be done on several frequencies. However, the use of certain frequencies at certain power levels requires an FCC license.

Typical model use today would be in the areas of FPV drone or fixed-wing racing. A commonly used frequency is 5.8 GHz. In order for an unlicensed person to use this frequency band, the FCC only allows specific power output maximum levels.

In this case, they use a complex calculation based on the measured output of the device from a specific distance away. If the device falls below a certain threshold, the FCC requires an FCC identification number on the device itself. This marking indicates that the transmitter can be legally operated without a FCC license.

These items have been tested and determined to have low enough power levels, and a fixed antenna as part of their design, so that they will not be an interference threat to other users. Typically these will be 25 milliwatts (mW) of power or less, but the actual determination process is complicated.

However, if the item’s output power is above this level or the antenna is replaceable, there will not be an FCC identification number on the product, and it will require the proper FCC licensing to operate.

Part of the complexity is that the item can have its power output increased by the use of different antennas attached to it. Antenna designs can increase or decrease the measured output of a device, known as “gain.” This increase in power is measured in decibels or dB. Because of this, most radio frequency units used in today’s FPV aircraft for transmitting a video signal will require the operator to have an FCC Technicians Class license. This is because of its higher level of power output, and also because the design of the unit allows for a screw-on antenna that can be switched out for different designs that have more power or gain.

The FCC determined that, because users can influence the output of the device this way, they need to have some knowledge about what interference could be caused unintentionally to other users by making, among other things, an antenna change. Hence the need for the license.