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Posted by HeliFlyer711 | Dec 27, 2013 @ 08:31 AM | 5,045 Views
AMS1117 Regulator Data Sheet

Background: AMS1117 PS regulator SOT-223
Thermal Considerations
The AMS1117 series have internal power and thermal limiting
circuitry designed to protect the device under overload conditions.
However maximum junction temperature ratings of 125C should
not be exceeded under continuous normal load conditions.
Careful consideration must be given to all sources of thermal
resistance from junction to ambient. For the surface mount
package SOT-223 additional heat sources mounted near the device
must be considered. The heat dissipation capability of the PC
board and its copper traces is used as a heat sink for the device.
The thermal resistance from the junction to the tab for the
AMS1117 is 15C/W. Thermal resistance from tab to ambient can
be as low as 30C/W.

The total thermal resistance from junction to ambient can be as
low as 45C/W. This requires a reasonable sized PC board with at
least on layer of copper to spread the heat across the board and
couple it into the surrounding air.
Experiments have shown that the heat spreading copper layer does
not need to be electrically connected to the tab of the device. The
PC material can be very effective at transmitting heat between the
pad area, attached to the pad of the device, and a ground plane
layer either inside or on the opposite side of the board. Although
the actual thermal resistance of the PC
...Continue Reading
Posted by HeliFlyer711 | May 20, 2012 @ 05:33 PM | 19,193 Views
How to go from pieces to piro's with the Walkera V450D01

Quick Link Thread Jump
Inside the Walkera RX2702V - 3 Axis Gyro w/ Integrated 2801-Pro Receiver - https://www.rcgroups.com/forums/show...79&postcount=2

Getting into the Walkera 2801-Pro Radio Stick Calibration Mode (Undocumented Feature) - https://www.rcgroups.com/forums/show...35&postcount=3

- OPTIONAL - Wet Sanding the V450's rough frame edges - https://www.rcgroups.com/forums/show...53&postcount=5

(Part 1) Flybarless Head & Disassembly/Re-Assembly Order - https://www.rcgroups.com/forums/show...33&postcount=4

(Part 2) The Rear Tail Assembly - https://www.rcgroups.com/forums/show...52&postcount=6

(Part 3) Carbon Fiber Frame Rebuild, Bearing Blocks, Tail Boom, Gearing Installations - https://www.rcgroups.com/forums/show...93&postcount=7

(Part 4) Prep for Align DS410M Servo Upgrade - DS4 Servo Arm Mod for Stock Geometry (Video) - https://www.rcgroups.com/forums/show...02&postcount=8

(Part 5A) Types of Gyro Tape Review & OPTIONAL - RX2702V Carbon Mount Plate Tape Mod - https://www.rcgroups.com/forums/show...59&postcount=9

(Part 5B) Walkera RX-2702V Installation on the V450D01 - https://www.rcgroups.com/forums/show...2&postcount=10

(Part 6) Walkera V450 Ball Links - Difference In Sizes & Knowing When To Replace Them (Video) - https://www.rcgroups.com/forums/show...8&postcount=11

(Part 7) Info on the Stock 40A Walkera ESC and Stock Motor...Continue Reading
Posted by HeliFlyer711 | Aug 23, 2011 @ 02:23 AM | 6,347 Views
Running on WiFi from an IPod Touch....Nice little quad packed with technology. It's been called a flying computer.......I'd have to agree. It has sonar sensors on the bottom, along with adaptive video camera that tracks the ground up to 20ft to keep the craft locked on course. Theres also a horizontal camera wih a wide angle for FPV if your into that sort of thing. Brushless inrunners on each corner and with the settings turned up it moves pretty fast. Here, in this vid the settings are at about 75% for stability.

Enjoy the vid

Flying Ar The Drone (High Winds) (3 min 25 sec)

Posted by HeliFlyer711 | Jul 06, 2011 @ 10:11 AM | 7,287 Views
Maiden Flight

Walkera V450D01 Flybarless -RX-2702V/2801-Pro (3 min 30 sec)

Latest addition to the fleet the Walkera V450D01, this is one great flying heli ...Continue Reading
Posted by HeliFlyer711 | Apr 28, 2011 @ 02:28 PM | 6,507 Views
All My Addictions In One Place
Posted by HeliFlyer711 | Jan 15, 2011 @ 11:31 AM | 7,356 Views
Circa Vietnam war era......still in use today in limited numbers. Enjoy!

Heli-Max AH-1J SeaCobra aka Walkera 4#3Q (3 min 5 sec)

Posted by HeliFlyer711 | Aug 02, 2010 @ 12:40 AM | 9,079 Views
Precision Blade mSR Heli (4 min 23 sec)

Posted by HeliFlyer711 | Jun 11, 2010 @ 11:22 AM | 10,355 Views
Picked up one of these yesterday, couldnt resist the flashing lights and scale body.

Bmcx2 (6 min 20 sec)

Posted by HeliFlyer711 | Jun 05, 2010 @ 08:10 PM | 8,821 Views
Testing out a new Detrum GY48v Gyro on my Belt, made a little vid & took some pics after dialing it in which went pretty smoothe. For $20.00 its wears well on the belt and flys nice for a piezo.
Much better than the stock gyro IMO.

BeltCPv2_Grit (5 min 51 sec)

Posted by HeliFlyer711 | Feb 11, 2010 @ 12:10 AM | 9,760 Views
Novus Cp-Walkera 4g3 Brushed to Brushless Conversion.WMV (5 min 42 sec)

Novus CP Stock Conversion to Full brushless with CNC Head.

At first I just installed a 005 w/ 14T
Then the 2g brushless tail
Then a CNC head.

Also added a 4G6 tailfin to protect the tail motor, add some weight for balance and of course looks.

18 Guage wire with 2mm bullet connectors from esc to motor for better power transfer

#30 Copper Enamel wire for the 2G tail direct to esc
Posted by HeliFlyer711 | Jan 12, 2010 @ 12:32 PM | 9,025 Views
4g3-novuscpstock.WMV (1 min 6 sec)

Head/Blade Balance Technique For the Micros

New head balance - some would call this running up the head.

IMPORTANT : Wear goggles you can lose an eye if a flybar comes loose...ask me how i know this

1) Install main shaft, gear and collar, run and check for true, sometimes the gear can be out of round and you can bend it pretty close to straight, if not it will produce vibes even at speed when it looks straight, this can effect the gyro and consequently the tail, sometimes you get lucky and it is straight out of bag. Also the tail gear has to be aligned properly, and check your gear mesh on the motor pinion is not too tight and not too loose. I keep the collar on the top bearing seated and not loose so there is no play/slop.

2) Install head block only with pin, check for true at speed on shaft, by looking at center dot on head cap... Once verified straight remove.

3) Assemble complete head - install on shaft and eye up linkages, I use a caliper to make them all the same, but due to servo arms being off, those you have to do one at a time, if you look in the center of the swashplate there is a bearing where the shaft goes through, if you get that bearing level on all sides your swash is level. (I usually get 17mm on the flybar guide links, and 5 turns out from closed to start on the bell/hiller mixer arm, which one immediately gets screwed down once i run the head up)

4) Run head with flybars only, flybars even with...Continue Reading


Posted by HeliFlyer711 | Dec 30, 2009 @ 05:12 PM | 8,226 Views


Posted by HeliFlyer711 | Dec 20, 2009 @ 01:06 AM | 8,322 Views