RE: 150 meter rule.
The 150m mark is measured in Google Earth via the ruler tool, double checked with two other units (miles and km). It should be accurate, unless there is a bug in Goole Earth. I do not know exact width of the runway. Thanks for bringing up the point.
Posted on: 9/16/2012 5:11 PM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11230399

RE: 150 meter rule.
Here is the flight box at 150m flight line at my field. The extended center line stops at 190m. I was surprised how close that 150m line is. Seems fly slow is the key, if the objective is to hit the 150m line![image][/image]
Posted on: 9/16/2012 1:40 PM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11230199

RE: Batteries running-in and swollen batteries
My experience has been that some brand new packs are defective on arrival. The best way to detect is to fast charge the pack as it will be charged later on. A pack with at least one cell super slow to take charge is defective and should be returned. On controlling of swelling which is inevitable, it seems a good practice is to avoid over-discharge (e.g., discharge it too fast, at a higher rate), for the packs at hand. Use of a low pitched prop (e.g., 20.5X13 instead of 20.5X15), flying the plane slow, and proper throttle management do help.
Posted on: 9/16/2012 6:41 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11229896

RE: Batteries running-in and swollen batteries
Seems this is a good article on the subject. It is [link=http://barnson.org/node/1842]here[/link]. As explained, water in the mix, over-charge or over-discharge, and poor separator construction are the three reasons for a swelling lipo pack.
Posted on: 9/15/2012 5:52 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11229115

RE: 150 meter rule.
[quote]ORIGINAL: EHFAI The resolution of the ET GPS appears good enough (usually using 9 sats). For example, one can easily determine ''roundness'' of rolling circles (or 8's) as well as size, as these are in a horizontal plane. Vertical maneuvers are more difficult, some of which lies with the ET viewer. The data are compiled so as to present a track relative to time and we fly a sequence in the same space  (box). So the track of each maneuver overlays the previous - it ends up looking like chicken scratch. That means each maneuver (or a couple at most) must be done individually, which is very time consuming. Some work has been done to translate the data into a 3D ''box'' which would allow an entire sequence to be scrolled through on a maneuver by maneuver basis referencing the time base. It would also be possible to look at a maneuver from various viewpoints. I'll let the persons working on this to comment further if they wish - but work in progress. Another trick that might work is to switch the logger off/on in flight (which starts a new data group) to limit the overlaying of maneuvers during a sequence - haven't tried that yet. [/quote] Good to know somebody is working on the idea. It probably is not difficult to determine the begin and the end of a displayable maneuver. One possible heuristic would be that such a maneuver starts/ends at the current min or max of the horizontal axis. Once one maneuver is identified, mark it and go to the next one. I was worried that the GPS does not have enough precision (+/- 20 ft?) to depict a vertical maneuver meaningful to our use.
Posted on: 9/14/2012 8:51 PM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11228942

RE: 150 meter rule.
[quote]ORIGINAL: EHFAI I've learned a couple of ''tricks'' for using the ET GPS, (at least mine) doesn't work above 6v supply - I use a 5.2v reg between it and the power source. Mounting the GPS RX in the wing works well  (1/8'' x 1 x 1 slot in the foam) - CF and power unit stuff can block the signal. Initial satelite acquisition takes a couple of minutes - each power up during that days work then are quick. Lock on to sats in the pilot box, then the closest distance shown each pass is the distance out (in front of the pilot). [/quote] Earl, Thanks for sharing the experiences/tips using the ET GPS. I have once considered using the ET unit to plot the track for the whole sequence, using the recorded GPS data (see an [link=http://www.eagletreesystems.com/Plane/5.htm]illustration[/link] here). The idea is to check out the geometry of maneuvers with the plot of the sequence in 2D/3D. In your experience, do you feel the data recorded via the ET GPS has enough precisions and resolutions? Thanks
Posted on: 9/14/2012 6:09 AM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11228195

RE: BJCraft Episode
The bottom 6 horns are made of carbon fiber sheet as shown in the picture. In the worse case that play/wear develops, one could drill a separate hole or take the entire piece out via Drimel tool. Not an easy job though.
Posted on: 9/14/2012 5:40 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11228174

RE: Questions from first time pattern electric
My 10s charger displays the IR numbers as well voltages for each cell, in either 5cell or 10cell charging mode. Because of the size of the display screen, the numbers are cycled. That is, the IR numbers for the 1st subset of the cells are displayed for a couple of seconds, followed by the IR numbers for the 2nd subset. The same is true for the voltages. The IR numbers are good measure about the health of the pack. I found if one cell's IR is over 5mohms, the pack is pretty much not-competition-worthy. I always charge in 10cell mode (or 2 pack in FMA terminology) to minimize the charging time. At 1C charging rate (i.e, 5A), It takes about 30-40 minutes to reach a full charge. I use one 380W DC converter per 10s charger.
Posted on: 9/13/2012 5:19 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11227749

RE: BJCraft Episode
On carbon fiber control horns that glue into the control surfaces. Look neat but will the material durable enough for hundreds of flights? These horns are pretty much not replaceable.
Posted on: 9/13/2012 5:05 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11227729

RE: Questions from first time pattern electric
Here is a [link=http://www.youtube.com/watch?v=MnldHRtjre8]video[/link] on how to solder bullet connectors. I use 4mm bullets for all my battery packs, the ESC and the motor. Depending on what packs you are buying, 4mm or 5mm bullet connectors are pre-installed.
Posted on: 9/13/2012 6:41 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11227077

RE: Questions from first time pattern electric
It can be done the same way with a a big soldering iron (e.g. 100W). The wire tip has to be filed to shape first so it can go into the socket easily.
Posted on: 9/13/2012 6:39 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11227136

RE: BJCraft Episode
It is good to know you ca customize the scheme. The stock color scheme is beautiful. I would prefer more lighter color at the bottom half of the fuse though. On a different subject. The shape of the wing panels looks fancy. What is it called and what are the advantages?
Posted on: 9/11/2012 12:13 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11225254

RE: Am I the only one who flies pattern with no mixes in their plane ??
I see this as personal preferences, whether the correction is done through manual stick inputs or automated mix inputs. The important thing is though that with a good computer radio, minor imperfection of the plane can be easily fixed through mixing.
Posted on: 9/9/2012 7:22 AM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11222660

RE: Throttle Spring vs Servo Current
The potential problem/danger is WHEN the connection breaks away from the engine throttle arm. Without the spring, it will not automatically return to idle/kill position.
Posted on: 9/3/2012 5:25 AM by Author "nonstoprc" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11215422

RE: using old lipo
It does not hurt to give it a charge and see if all cells can take the charge. If one cell is slow to take the charge, the pack may be near its life cycle. I had a brand new 5000 mah Turnigy 20C that was in storage condition (at 50% full) for over 6 months. When I paired it with another pack, it is as good as new.
Posted on: 8/30/2012 5:05 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11212038

RE: Futaba 9650 servos for pattern
There is also the Futaba BLS-651 Brushless. Almost identical mounting footprint as 9650, metal gear and great torque specs @ 6v (97 ozin). Control System: +Pulse Width Control Required Pulse: 3-5 Volt Peak to Peak Square Wave Operating Voltage: 4.8-6.0V Operating Temperature Range: -20 to +60 Degree C Operating Speed (4.8V): 0.15sec/60 degrees at no load Operating Speed (6.0V): 0.12sec/60 degrees at no load Stall Torque (4.8V): 76.4 oz/in. (5.5kg-cm) Stall Torque (6.0V): 97.2oz/in. (7.0kg-cm) Motor Type: Brushless Motor Potentiometer Drive: Indirect Drive Bearing Type: Dual Ball Bearings Gear Type: Metal Connector Wire Length: 12" Dimensions: 1.40� x 0.59� x 1.13� (35.5 x 15 x 28.6mm) Weight: 0.92 oz. (26g)
Posted on: 8/25/2012 12:52 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11205692

RE: 18 MZ Charging
You could buy a spare battery and swap it in when the other is in need of a recharge.
Posted on: 8/24/2012 5:53 PM by Author "nonstoprc" in the forum "Futaba Radios Direct support forum"
http://www.rcuniverse.com/forum/fb.asp?m=11204951

RE: 62
Sounds like the left wing panel generates more lift hence the need for left aileron trim. Is wing incident the same for both panels? Is the left wing "ahead" of the right (i.e., the distance between the tip of the left panel to the tail end of the fuse center is more than that of the right)?
Posted on: 8/24/2012 4:12 AM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11204246

RE: Futaba 9650 servos for pattern
Here are the specs for potential replacement servos for 9650. Seems there are more than one choice! ================ Futaba BLS-153 Control System: +Pulse Width Control Required Pulse: 3-5 Volt Peak to Peak Square Wave Operating Voltage: 4.8-6.0V Operating Temperature Range: -20 to +60 Degree C Operating Speed (4.8V): 0.15sec/60 degrees at no load Operating Speed (6.0V): 0.12sec/60 degrees at no load Stall Torque (4.8V): 76.4 oz/in. (5.5kg-cm) Stall Torque (6.0V): 97.2 oz/in. (7.0kg-cm) Motor Type: Brushless Motor Potentiometer Drive: Indirect Drive Bearing Type: Dual Ball Bearings Gear Type: Metal Connector Wire Length: 12" Dimensions: 1.40� x .59� x 28.6� (35.5 x 15x 28.6mm) Weight: 0.92 oz. (26g) ======================== JR DS3421 Digital Mini MG Servo Specs Size Category: Minis and Micros Type: Digital Application: High-performance aircraft when space and weight are at a premium, yet the need for precision is high. Torque: 65 oz-in @ 4.8V; 75 oz-in @ 6V Speed: .18 sec/60° @ 4.8V; .15 sec/60° @ 6V Length: 1.30 in Width: 0.58 in Height: 1.02 in Weight: 1.04 oz Bushing Or Bearing: Bearing Bearing: Dual Motor Type: Coreless Gear Type: Metal Voltage: 4.8V-6.0V =============================== JR DS3711HV High Voltage Digital Mini Torque MG Servo Specs Size Category: Standard Type: Digital Application: Small Aircraft and Sailplanes Torque: 86 oz-in (2S Li-Po) Speed: .13 sec/60° (2S Li-Po) Length ================ Savox 1250mg This is the Savox SH-1250MG Super Torque Metal Gear Mini Digital Servo-savsh1250mg. Features: The coreless motor and light weight design provides smoother, faster, and more efficient operation. The metal case design not only looks awesome but also allows for cooler and smoother operating temperatures. Metal gears form a solid framework for precise control and operation. Supports digital and analog control signals Ideal for rudder on 450 level helis, CCPM on 500 level helis, and steering servo on 1/12th scale cars. Dimensions(mm): 35.0X15.0X29.2 Weight(g): 29.6 Speed(@4.8V sec/60): .16 Torque(@4.8V oz-in): 30.6 Speed(@6.0V sec/60): .11 Torque(@6.0V oz-in): 63.9 Gear: Metal Bearing: 2BB Case: Aluminum 25 Tooth Spline ================ Airtronics 94761Z - Micro Digital Wing Servo Basic Information Modulation: Digital Torque: 4.8V: 55.0 oz-in (3.96 kg-cm) 6.0V: 66.0 oz-in (4.75 kg-cm) Speed: 4.8V: 0.15 sec/60° 6.0V: 0.12 sec/60° Weight: 0.81 oz (23.0 g) Dimensions: Length:1.06 in (26.9 mm) Width:0.47 in (11.9 mm) Height:1.18 in (30.0 mm) Motor Type: 3-pole Gear Type: Metal Rotation/Support: Dual Bearings
Posted on: 8/23/2012 8:58 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11204105

RE: Futaba 9650 servos for pattern
Thanks guys for the tip and suggestion. On BLS 153, Tower [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXYAE9]here[/link] lists its replacement gear as nylon (in black). Are these gears durable?
Posted on: 8/22/2012 9:08 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11202904

Futaba 9650 servos for pattern
I found myself that I need to replace the gear set for 1 elevator and 2 split rudder 9650s on my Passport, after 1.5 season (about 150 flights in total). All three have some centering issue. The stock 9650 gears are nylon, and I wonder if there is metal-type substitute. The other alternative is to replace 9650s with some other choices. What elevator servos are you using?
Posted on: 8/22/2012 7:04 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11202766

RE: New pattern ship recomendation
Another factor to consider is the durability of the plane, mainly the fuse, over hundreds of flights. A fiberglass fuse can take a lot beat, such as hard landings, and maintain the rigidity/precision over several seasons. Some of fibger-glass kits are just over $1100 (such as the ARIXTRA, VISA etc).
Posted on: 8/21/2012 5:12 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11201398

RE: Lipo Recommendations
[link=http://www.hobbyking.com/hobbyking/store/%5F%5F9270%5F%5FTurnigy%5F2200mAh%5F4S1P%5F20C%5FLipo%5FPack.htm]Turnigy 4s 2200mah 20C is available from HobbyKing's USA warehouse [/link]. $16 bucks per piece.
Posted on: 8/20/2012 6:42 PM by Author "nonstoprc" in the forum "E-Flight Power Sources"
http://www.rcuniverse.com/forum/fb.asp?m=11200290

RE: LiPo rookie
[quote]ORIGINAL: jackalope54 Trax de Max - per an analog multimeter, the pack voltage is over 16 V. Nonstoprc - the battery is a Zippy that has been charged about 10 times. I got it October 2011 and I generally charge it once per month. The most I recall it taking was about 1950 ma and has never been below 3.6 V per cell. I know it's a cheap battery with questionable quality - did
Posted on: 8/19/2012 8:30 AM by Author "nonstoprc" in the forum "Batteries & Chargers"
http://www.rcuniverse.com/forum/fb.asp?m=11198625

RE: LiPo rookie
Seems once cell (the one with after-charge voltage of 4.230v) is slower to take charge than the rest of the cells. Because of that, the charger chargers the rest of the cells more than it can balance at the end (to 4.307v), while just fills the slow-cell to the standard cut-off voltage for lipo. In my experience, a slow-charging lipo cell always means the cell is near its life cycle. The brand and how many cycles on the pack? Usually the glow-engine starter requires 12v DC (3S lipo) to drive.
Posted on: 8/19/2012 3:43 AM by Author "nonstoprc" in the forum "Batteries & Chargers"
http://www.rcuniverse.com/forum/fb.asp?m=11198454

RE: F3A Results - SPOILER
The ESC actually changes the direction of the current over time, as explained in the document. There is no brush involved. The motor is driven by o/off of the voltage and the direction of the current with high frequency. The later would imply a change of the polarity of the voltage.
Posted on: 8/17/2012 3:24 PM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11197198

RE: F3A Results - SPOILER
Well, as the original post of the question (whether our motor is AC or DC), I was confused as well. Here is a good article explaining the guts of how a brushless motor is driven: ftp://ftp.ni.com/pub/devzone/tut/dcvsacbrushless.pdf. The bottom line is how the ESC applies the current to the three motor wires at any point of time. In one scheme (ref to section "DC control/phase–phase connected motor"), the current direction in one wire can change over time, which is very similar to AC current!
Posted on: 8/17/2012 6:50 AM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11196718

RE: Bullet Connector Size
4mm. Make sure the wires are soldered properly and the connection is tight. I have good luck with the 4mm sold by HobbyKing.com.
Posted on: 8/8/2012 9:28 PM by Author "nonstoprc" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11186475

RE: F3A Results - SPOILER
Is it true that the brushless motors used in pattern planes are mostly AC motors? The torque curve of an AC motor can differ from a DC motor. Check out this URL: http://www.jmag-international.com/catalog/68_ThreePhaseInductionMotor_SpeedTorque.html.
Posted on: 8/8/2012 6:39 AM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11185398

RE: F3A Results - SPOILER
LOL
Posted on: 8/6/2012 6:49 PM by Author "nonstoprc" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11183546