video

This is nothing to do with flying, but is very funny

http://www.youtube.com/watch?v=jWFq-v7TKdQ 

Weasel at Cam Long Down

http://www.youtube.com/watch?v=i8_oHBvId24&feature=player_embedded 

Minchinhampton

People may be disturbed by noise from model aircraft in the countryside as well as indoors or in their own gardens, and the peace and quiet of rural areas should be respected. In addition there may be some urban open spaces, such as ornamental parks or children's play areas, where model-flying would be inappropriate and should not take place at all. Nature and wildlife reserves, country parks or other countryside areas where people go to relax in quiet and peaceful surroundings, should also be avoided by model-flyers. Preferably, model-flying in country areas should be confined to specified locations where suitable provisions have been or can be made with the agreement of local farmers or landowners, and where the risk of disturbance is relatively slight. Noisy pursuits will usually be out of place in National Parks. Model-flyers should therefore seek the agreement of the National Park Authority before operating from any site in a National Park, however remote it may be.

 Model-flyers should therefore seek the agreement of the National Park Authority before operating from any site in a National Park, however remote it may be.

Where no direct supervision (eg by clubs) of flying is possible, it is recommended that the following should apply:

i. the point of launch of control-line and model aircraft with limited engine-run should not normally be closer to any noise-sensitive premises than 300 metres;

ii. the point of launch of radio-controlled models with continuous engine-run (which range over a greater area) should not normally be nearer to any noise-sensitive premises than 500 metres;

iii. models should not be flown closer to any noise-sensitive premises than 200 metres.

Electric Motors

A NOTE; ON THE DIFFERENT NAMING  SYSTEMS / NAMING CONVENTIONS FOR BRUSHLESS
MOTORS:

Manufacturers, distributors and sometimes retailers can all use different naming systems for brushless motors.  This can be very confusing.  - For instance. even though a particular brushless motor may be exactly the same
regarding internal components, may be made in the same factory, and may have identical specifications, it can be produced by the OEM manufacturer with different external colours, different shaped outside housings and with a
different external finish. 
The various distributors who then "market" or "brand" this motor, can then call this same motor by different names and codes.   (-And sometimes these distributors or "Re-Branders"  then "pretend" that they themselves are the actual manufacturer of the motors, which of course is a complete fabrication -or lie ... )
("OEM" =Original Equipment Manufacturer;  An "OEM" manufactures products or components that are purchased by a company and retailed under that purchasing company's brand name.  OEM refers to the company that originally manufactured the product ).

This has several effects:
a.  It makes it difficult for us to realise that brushless motors with different names and external appearances, are actually exactly the same motor internally.
 
b.  It makes it difficult for us to link different motors made by the same OEM manufacturing factory  (-almost always a chinese factory, in 2012 ...)
 
c.  It sometimes makes it difficult for us to choose the appropriate brushless motor for a particular plane or helicopter.  For instance, the plane or heli instruction manual may recommend a motor of a particular
brand, with the motor named for stator size.  We may not realise that a differently branded motor, but instead named with respect to  external dimensions, may be just as good a choice of motor, or sometimes a better
choice, for this plane or heli.
 
d.  We can also add the following effect:  Sometimes, a manufacturer or distributor might not wish us to know which OEM factory has actually manufactured the motor, and so they name the motor with a different naming
system,  to try and hide this information.

For instance, as mentioned previously, the Hacker A30-12 XL V2 motor is exactly the same (internally) as the OK Hobby Infinite 3025-770Kv 12T motor, and they are both made in the same SunRay Technology factory.   However, the Hacker motor sells for $140, whereas the OK Hobby Infinite one sells for $35.  One way to hide the fact they are the same motors from us gullible and impressionable consumers, is to name them with different conventions -as has been done in this case.

e.  Distributors like to keep their "trade secrets" completely hidden from us.  In the case of Hacker and Torque motors, for instance, it had been almost impossible for 3 years to discover exactly which Chinese factory made 
these motors.  Everyone in the industry seemed frightened to reveal this information.  However, once the information was revealed, then it became clear that the Hacker/Torque Chinese factory was making the same motors, under a large number of other brand names and colours, and that these differently-branded identical motors were being sold widely for 25% of the Hacker retail price.

Here are some of the most common naming systems,  or naming conventions,
used for brushless motors:

  1.  STATOR SIZE
The stator of an outrunner brushless motor is the central non-rotating part, which is radially arranged, and which is wound with a given number of turns of copper wire.  The outer can with magnets mounted on its internal face,
rotates around this stator.  Stator arms are always in multiples of three ( -whereas motor magnets are always in multiples of two ).

Many manufacturers and distributors name their motors with respect to stator size;  For instance AXI, Scorpion, Emax, O.S., Pulso, Suppo, generic SunRay and its derivatives (LiPolice, Foxy, OK Hobby Infinite and  Z-series Hyperion)  are all named this way.  Worth noting that Pulso motors are basically a copy of AXI motors, use the same stator-size naming system, and are sold in the USA (with small modifications) as Innov8tive Cobra motors. e.g.  The AXI 2203/52 motor, has a stator which is 22mm diameter, 3mm in length, and is wound with 52 turns of wire.

The AXI 4130/16 motor, has a stator which is 41mm diam, 30mm length, and is wound with 16 turns of wire.
The Scorpion SII-3020 motor, has a stator which is 30mm diam, 20 mm length ( and is wound with 12 turns of wire ).
The LiPolice/Foxy/SunRay 2213/22T motor has a stator which is 22mm diam,
13mm length, and is wound with 22 turns of wire.
The Suppo A2820-6 motor has a stator which is 28mm diam, 20mm length, and is wound with 6 turns of wire.

    2.  EXTERNAL DIMENSION
Some manufacturers name their motors with respect to their external dimensions, usually outer diameter and length.
XYH (i.e. EMP), most Turnigy, Saite and others,  name their motors this way. 
(-Worth noting that XYH (EMP) motors are sold under many dozens of brand names -including Turnigy "standard" and Turnigy "SK1"  -and mostly all these brands also use this external-dimension naming convention for these motors)
e.g.  The XYH N2830/13 motor is  28mm diam, 30mm long, and has 13 turns of wire  (its stator size is 22mm diam, 13mm length  -same as a "2213" motor on stator-size )
The XYH N5055/07 motor is 50mm diam, 55mm long, and has 7 turns of wire (its stator size is  40mm diam, 25 mm length  -same as a "4025" motor on stator-size)
The Turnigy SK3 3542-1000kv motor, is ~35mm diam, ~42mm long (has 12 turns of wire)  (its stator size is  30mm diam, 20 mm length  -same as a "3020" motor on stator-size)

    3.  THE HACKER MOTOR NAMING SYSTEM
Hacker uses a different and seemingly unique naming system.  The first number reflects power level: "20" motors seem to refer to roughly an I.C.
20-size power level,  "30" motors refer to I.C. 30-size in power level; whereas "50" refers to I.C. 50-size power level,   etc  etc.
The second number in the Hacker naming system, refers to the number of winds of wire on the stator.  The final letter in the Hacker name, refers to the length of the motor -either S, M, or L (small, medium, large).  (Note: Keda
motors are basically -poor -copies of Hacker motors, and since they are copies, they also copy and use the same Hacker naming system ). 
For instance, the Hacker A10-9L motor, is "10" size, has 9 wire turns, and is "L" -22mm long  (its stator size is 17mm diam, 9mm length  -same as a "1709" motor on stator-size)   (its external size is 21mm diam, 22mm
ong  -same as a "2122" mtor on external dimension)
The Hacker A30-12-L-V2 motor, is "30" size, has 12 wire turns, and is "L" -42mm long  (its stator size is 30mm diam, 20mm length  -same as a "3020" motor on stator-size)   (its external size is ~35mm diam, ~42mm
ong  -same as a "3542" motor on external dimension) The Hacker A50-16-S-V2 motor, is "50" size, has 16 wire turns, and is "L" -~55mm long  (its stator size is 40mm diam, 25mm length  -same as a "4025" motor on stator-size)   (its external size is ~50mm diam, ~55mm ong  -so same as a "5055" motor on external dimension)

     4.  E-FLITE MOTOR  NAMING SYSTEM
E-Flite name their motors directly, with respect to their equivalent I.C. power level   (E-Flite motors are all made by the ChinaHimark factory, in China  -they are all ChinaHimark "C-Type" motors).
For instance, the E-Flite Power 10 motor is 35mm diam, 43mm long   (its stator size is 30mm diam, 20mm length  -same as a "3020" motor on
stator-size)   (its external size is ~35mm diam, ~42mm long  -same as a "3542" motor on motor external dimension).
The E-Flite Power 46 motor is 50mm diam, 55mm long    (its stator size is40mm diam, 25mm length  -same as a "4025" motor on stator-size)   (its external size is ~50mm diam, ~55mm long  -so same as a "5055" motor on
external dimension)
Turnigy "EasyMatch" motors also use the same power naming system as E-Flite, relating the motors to their equivalent I.C. power level.

     5.  HIMAX / HIMARK MOTOR  NAMING SYSTEM
HiMax (also called "HiMaxx" and "HiMark") motors are also manufactured by the ChinaHimark factory, in China.  They are distributed in the USA and in Europe by the Maxxprod company, and are sold in Europe as  Multiplex Himax,
TopModel XPower, and JP Energ C-type motors  -these brands are all the same motors.   These motors all use a different naming system, which is a hybrid of other systems already mentioned.   The first number in the name shows the diameter of the motor,  and the second number shows the length of the stator.
For instance,  the Himax/XPower C2812-26 is 28mm external diam, has a stator
of 12mm length, and has 26 wire turns  (its stator size is 22mm diam, 12mm length  -same as a "2212" or "2213" motor on stator-size)   (its external size is ~28mm diam, ~30mm long  -same as a ~"2830" motor on external
dimension)  ( -This is the same motor as the  E-Flite Park 400, 920Kv motor).The Himax/XPower C5020/14  is 50mm diam, has a stator of 20mm length, and has 14 wire turns  (its stator size is 40mm diam, 20mm length  -same as a "4020" motor on stator-size)   (its external size is 50mm diam, 55mm ong  -same as a "5055" motor on external dimension)  ( -This is the samemotor as the E-Flite Power 46 670Kv;  and also same motor as:  Turnigy G46
670kv ).

    6.  TORQUE MOTOR NAMING SYSTEM
Torque motors are, of course, made together with Hacker motors, in the SunRay Technology factory.  They are identical internally and also in specs to Hacker motors.  They have a different external appearance to Hacker,
which is just cosmetic, and has no relation to motor performance.   The naming system for Torque motors is confusing, and gives relatively little useful information about the motor.  Some motors are named with reference
only to number of turns and Kv;  Other motors are named with reference to approximate stator diameter, as well as number of motor turns and Kv.
For instance, the Torque 20T/1030 motor has 20 wire turns and a Kv of 1030. 
It has a weight of ~55g,  external diam of 28mm and length of 30mm  (its stator size is 22mm diam, 13mm length  -same as a "2213" motor on stator-size)   (its external size is 28mm diam, 30mm long  -same as a "2830"
motor on external dimension).   ( -This is the same motor as:  Hacker A20-20-L-EVO, Kv 1022, 20T;  and SunRay/LiPolice/Foxy 2213-1080Kv 20T;  Also same as Turnigy SK3 2830-1020kv, 20T)
The Torque 2814T/820 motor: the 1st number is "28" -actually it has a stator diam of 30mm;  It has 14 wire turns, Kv of 820, weight of ~143g,  external diam of 35mm and length of 42mm  (its stator size is 30mm diam, 20mm
ength  -same as a "3020" motor on stator-size)   (its external size is ~35mm diam, ~42mm long  -same as a "3542" motor on external dimension).   ( -This is same motor as:  Hacker A30-14-L-V2, Kv 800, 14T;  and also as: Turnigy SK3 3542-800Kv 14T)
The Torque 2812T/720  -also has a stator of diam of 30mm;  It has 12 wire turns, Kv of 720, weight of ~177g,  external diam of 35mm and length of 48mm (its stator size is 30mm diam, 25mm length  -same as a "3025" motor on stator-size)   (its external size is ~35mm diam, ~48mm long  -same as a "3548" motor on external dimension).   ( -This is the same motor as: Hacker A30-12 XL V2, Kv 700;   LiPolice/SunRay/Foxy 3025-770Kv 12T;  and as:
Turnigy SK3 3548-700kv, 12T ).

    7.  PJS MOTOR NAMING SYSTEM
PJS brushless outrunner motors are named very simply, according to the amount of static thrust that they are capable of producing.  Of course, in
practise the amount of thrust depends critically on the prop used, and number of Li-Po's used  -so it is not necessarily a useful or accurate naming system.
e.g.  The PJS 3D 300 SFR motor, is for indoor models.  It produces 300g of static thrust; It is heavy by the standards of today  -weight 36.5g;  Kv 1210;  external diam 32, length 45mm.
The PJS 3D 1500 motor, is for park flyers.  It produces 1500g of static thrust;  Weight 131g;  Kv 765;  external diam 40, length 45mm.
The PJS 3D 5000 motor, is suitable for 50-size models  e.g. the Sebart Angel 50.  It produces 5000g of static thrust;  Weight 457g;  Kv 407;  external diam 53, length 55mm.

    8.  MEGA MOTOR NAMING SYSTEM
Mega outrunner motors have a naming system which is a little different to others.  Some motors are named with reference to the older brushed motors.

Other larger motors are named with reference to stator size and number of turns. e.g.  The  Mega RC 600/10/8  motor:  is equivalent to a 600-size brushed motor; the 2nd number "10" shows a stator length of 10mm, the 3rd number "8" shows it has 8 turns.   Weight 85g, Kv 1695, diam 36mm,  length 35mm  (its stator size will be 30mm diam, 10mm length  -same as a "3010" motor on stator-size)   (its external size is ~36mm diam, ~35mm long  -same as a "3536" motor on external dimension).

The Mega RC 41/30/15 motor:  1st number shows stattor diam 41mm;  2nd number "30" shows a stator length of 30mm, the 3rd number "15" shows it has 15 turns.   Weight 499g, Kv 410, diam 49.3mm,  length 52mm  (its stator size is 41mm diam, 30mm length  -same as a "4130" motor on stator-size)   (its external size is ~50mm diam, ~52mm long  -same as a "5052" motor on externaldimension).

  9.  MVVS MOTOR NAMING SYSTEM
MVVS uses a different motor naming system to that of any other company.

Each outrunner motor is designated with a 1st single  number, signifying size of the stator,  and the Kv.   A list of the motor numbers is shown below, showing the stator size that this number refers to. e.g.  The MVVS MVVS 2,0/1120  has a stator diam 26mm, length 9mm,  and Kv 1120.  Weight 87g, external diam 36mm, length 31mm  (-same as a "2609" motor on stator-size)   (-same as a "3630" motor on external dimension).

The MVVS MVVS 8.0/680 has a stator diam 36mm, length 20mm,  and Kv 680. Weight 223g, external diam 44mm, length 46mm  (-same as a "3620" motor on stator-size)   (-same as a "4446" or ~"4240" motor on external dimension).

For MVVS motors:
No Stator diam Stator length
2.0 ....   26 mm      .... 9 mm
2.5 .... 26 mm .... 13 mm
3.5 .... 26 mm .... 18 mm
4.6 .... 26 mm .... 26 mm
5.6 .... 26 mm .... 36 mm
6.5 .... 36 mm .... 15 mm
8.0 .... 36 mm .... 20 mm

The weather

have a look at http://weatherspark.com/#!dashboard;ws=28771 very technical
From Ken