some notes - RC Groups
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This thread is privately moderated by bigtruck169, who may elect to delete unwanted replies.
Jan 19, 2012, 03:45 PM
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some notes

edward AFB ( in buffalo area)

clear car body shell material - lexan ( about $30 per 12x48) depends on the thickness- 1mm should be good

3d plane setup

Colts Neck, New Jersey

for crawler - duratrax intellispeed esc

ARC-28-37-2 for rifle, 4.1x4.1 prop

Turnigy 480s 3200kv inrunner on 4s - 80amp ESC with 6x4 sport prop -

$3 wattmeter -

center of gavity calculator -

Jet plans -
- park

fun jet - prime 8 - for fuse and crowls

Stryker 6x4 prop...I have also used the APC 6x4 e prop..The Stryker prop puts out more thrust though.I learned this early on..We used to build a lot of the F22 profile jets and powered them with the Stryker setup..I found out that the jets had quite a bit more vertical thrust with the stryker prop over the APC..

*** warbirds in bold ***

Jun 05, 2003 --> AeroBird 3
ParkZone Fall 2005 brochure
May 05, 2005 --> P-51D Mustang
Summer/Fall 2005 --> Typhoon 3D Brushless
Summer/Fall 2005 --> F-27B Stryker
Summer/Fall 2005 --> J-3 Cub
Summer/Fall 2005 --> Slo V
Summer/Fall 2005 --> Super Decathlon (red)

Jan 26, 2006 --> Focke Wulf 190
Jan 31, 2006 --> Typhoon 2 3D
Jun 06, 2006 --> F-27C Stryker
Nov 23, 2006 --> Super Cub

May 09, 2007 --> Spitfire
Oct 24, 2007 --> T-28B Trojan (Navy)

Apr 09, 2008 --> Ember
Apr 16, 2008 --> Vapor
Apr 21, 2008 --> J-3 Cub BL
May 14, 2008 --> Micro Citabria
Sep 17, 2008 --> F4U Corsair
Jan 09, 2008 --> Micro Cessna 210 Centurion

Mar 23, 2009 --> Sukhoi Su-26M
May 26, 2009 --> Super Cub LP
Mar 30, 2009 --> Super Decathlon Brushless (yellow)
Jun 05, 2009 --> Mini Super Cub
Jun 05, 2009 --> T-28D Trojan (Air Force)
Jun 18, 2009 --> P-51D BL Mustang
Aug 13, 2009 --> Messerschmitt BF-109G
Aug 27, 2009 --> P-40 Warhawk 300 (E-flite)
Sep 01, 2009 --> Ultra Micro P-51D Mustang
Sep 09, 2009 --> Ember 2
Nov 30, 2009 --> Habu 32 DF (E-flite)
Dec 10, 2009 --> Ultra Micro J-3 Cub

Feb 10, 2010 --> Night Vapor
Apr 07, 2010 --> Champ
May 10, 2010 --> UM Sukhoi SU-26xp
Jul 09, 2010 --> Extra 300
Jul 22, 2010 --> Stinson Reliant SR-10
Aug 04, 2010 --> Ultra Micro T-28B Trojan (Navy)
Aug 18, 2010 --> UMX Beast ***I know, it's an E-flite plane, but I have one
Jun 24, 2010 --> F4F Wildcat
Nov 14, 2010 --> Radian Pro
Nov 24, 2010 --> P-47 Thunderbolt

Feb 20, 2011 --> Ultra Micro Mosquito Mk VI
Apr 13, 2011 --> UMX Sbach 342 (E-flite)
Feb 2, 2011 --> Ultra Micro F4U Corsair
May 25, 2011 --> SE5a RAF
May 25, 2011 --> Super Cub 25e (E-flite)
May 31, 2011 --> F-27Q Stryker
Jun 29, 2011 --> UM Pole Cat
Jul 27, 2011 --> UM F-27Q Stryker 180
July 29, 2011 --> Icon A5
Aug 17, 2011 --> Carbon-Z Scimitar (E-flite)
Sep 1, 2011 --> Spitfire Mk IX
Oct 19, 2011 --> UMX Beast 3D Basic w/ AS3X (E-flite)
Oct 19, 2011 --> UMX Gee Bee R2 w/ AS3X (E-flite)
Oct 19, 2011 --> UMX Hyper Taxi w/ AS3X (E-flite)

due Feb 2012 --> Hawker Hurricane 25e (E-flite)
due Feb 2012 --> Sea Fury (E-flite)
due Feb 2012 --> UMX MiG 15 DF w/ AS3X (E-flite)
due May 2012 --> F-4 Phantom 32 DF (E-flite)

20868RPM*4 (prop pitch)=83472 in/min.
83472 in/min. / 12=6956 ft/min
6956 ft/min * 60= 417360 ft/hr
417360 ft/hr / 5250= 79.5MPH

( KV * volt * pitch / 1050 = mph of the prop)

Exceed Monster 160 motor with a CC 85A HV esc swinging a 20x10 prop. WOT 64A @ 2400 Watts on 10s 5000mah batteries (two 5s batteries in series). With that setup it was 21lbs - CMP 120 ZERO

Tacon 60 from , 14x8 or 14x10 - Cermark Alley Cat

A wide range of testing shows an APC 10x5E requires around 210W to make around 40oz, or 2.5lb thrust. 12x6E, around 300W for about 3.5lbs. An estimate (that seems reasnable the way the actual model flys) is around 500W for over 6lb with a 13x8. The actual values will depend on how well the particular motor is matched to its load, but my conclusion is that on decent sized props and well chosen efficient systems, 100W/lb is actually a very capable power level delivering pretty much unlimited aerobatics, and not as seems often quoted, the minimum for good sports flying., it is an Airfield 2600Kv and Exceed RC Optima 2700Kv

Hobbyking Turnigy 2836-2350Kv
Turnigy 3648 Brushless Motor 1450kv - for fast funjet

testing brushless motor for short circuit.

You can check for wiring to stator shorts with an ohms test. You should not get any ohms reading from any of the three wires to the stator. Trying to measure the resistance of the motor wiring with a normal multimeter will only tell you if a winding is open circuited because the winding resistance is too low to measure with a standard multimeter.
The other thing that I do is to put the motor shaft into an electric drill, and spin the motor at the drill's top speed. You can then measure the back EMF AC voltage from A-B, B-C, and A-C while the drill is spinning the motor. All three AC voltages should be the same if the windings are in good condition. The amplitude of the 3 voltage readings will depend on the Kv of the motor and the speed that the drill is turning the motor.

* Analog meters are optimized for 60Hz true sin wave reading so that 1.25V reading between poles when the motor is driven is Ok as long as the 3 reading are close. If there was a short, one phase would have no voltage output, another problem might be a short at the connectors.

* Checking the windings is easy enough. 2 ways to do it.
#1 Measure the resistance between motor wires 1&2, 2&3, and !&3. Should be in the <1ohm range. Also measure the resistance between any metal part on the motor and each wire lead. Should be infinite.

* Detailed explanation plus cause, plus solution

Manufacturers use leadless solder for wires, whereas 'we' still use leaded solder, that may cause problems when the two types meet in/on a connector. Leadless solder has a higher melting point than leaded solder. Explanation and solution after the two videos, and the largish quote, quote, beginning at Whenever a motor just quivers back and forth ...: .

Two videos about soldering bullet and Deans connectors
-> New howto videos
-> third and fourth video, about saudering

Connector tests, also check out the technology and database links:

testing KV w/o fancy equipment
#2 Place the motor shaft in a drill press and while holding the case (non-rotating part), turn it on and measure the voltage from each wire pair. They should be equal +/-.
The voltage will be dependent on the drill press speed and the kv of the motor. If the drill press is turning at 1000rpm and the motor has a 1KV rating, you should see 1V.

* Low KV, 800 for quads, is like first gear in your car. Great for lifting weight but slow on the reaction time. They can swing a larger prop which generates more static thrust for lifting and generally use less amps.

Higher KV, around 1300 for quads, is similar to 6th gear in your car. They turn faster which requires a smaller prop so the amp level doesn't go to high. they can't cary as much weight with the smaller props but can move a quad around quickly for aerobatic flight.

A larger prop turning SLOWER, is more efficient and can lift more, than a SMALLER prop turning faster.
Last edited by bigtruck169; Sep 25, 2014 at 08:30 PM.
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