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hifinsword's blog
Posted by hifinsword | Sep 15, 2014 @ 07:01 AM | 1,141 Views
DISCUSSION: I have used the following NEW parts (with some exceptions noted that I did not buy or use) to convert my original V913 over to a BL Main Motor. I do not know if they are interchangeable with the BL Version of the V913 RTF sold at Banggood.com as SKU132652 ($119.99) or the BL Version BNF sold as SKU164666 ($99.99).

Link to BL V913 BNF BG's SKU164666 - $99.99: http://www.banggood.com/WLtoys-V913-...-p-944786.html

Link to BL V913 RTF BG's SKU132652 - $119.99: http://www.banggood.com/WLtoys-V913-...-p-922662.html

Link to New Version Tx (with camera functions) BG's SKU059576 - $25.35: http://www.banggood.com/Wholesale-WL...r-p-62435.html

1) New WL Toys BL Main Motor for the V913
Part # V913-p-01
BG's SKU158707 - $20.89:


Link: http://www.banggood.com/WLtoys-Brush...-p-941292.html
Printing on the motor says WL Model 1612, 4800Kv.

a) SHAFT - The new BL main motor has the same shaft diameter as the stock brushed motor of 2mm. Exposed shaft is 11.25 in length. Shaft inside motor is assumed to be 3mm since the shaft base widens to 3mm with a Circlip (C or E clip) to hold it in place. A plastic washer or spacer rotates with the base area.
NOTE: I used 1 washer each side as spacers to hold the motor area away from the motor mount plate to minimize any chance of rubbing against the mounting hole and reduce heat transfer to the plastic mount.

b) CAN SIZE = 22.1mm x 22.1mm. Bump on the bottom holds the shaft and extends 3.9mm from the base. A grub screw holds the shaft...Continue Reading
Posted by hifinsword | Jul 22, 2014 @ 10:58 AM | 1,837 Views
This is a short description of types of foam I have used and their easily identifiable characteristics.

Types of Foam

Depron - very light weight, brittle; NOTcontact cement safe. DO NOT use Welders Adhesive or forms of contact cement with Depron.

Elapor - blended EPS & EPP

EPO (Expanded Polyolefine) - Horizon Hobby (HH) calls their form of EPO, Z-foam.

EPE (Expanded Polyethelene)

EPP Expanded Polypropylene - (pool noodles) low structural strength; covers with low temp coverings; shipping tape does NOT stick to very well; use a spray adhesive or FoamTac with blemderm, fiberglass tape (drywall type), NexCare, clear surgical tape to reinforce surfaces; breaks clean, high compression strength, poor tension strength; comes in 1.3#, 1.9# densities; Compatible with Epoxy, Regular CA or Goop glues and Acrylic paint;

EPS Expanded Polystyrene - high structural strength; sensitive to heat, CA, polyester resins; Compatible with Epoxy or Polyurethane glues; comes in 1#, 1.5#, 2.0# densities; HH uses EPS on most or all of their UMX airplanes. Do not use CA on EPS unless it is foam-safe.

XPS Extruded Polystyrene

FFF - acronym for Fan Fold Foam (more commonly used as an acronym for Fast Forward Flight)

Z-Foam - (Horizon Hobby) does not require Foam-safe glue; regular CA is OK.
Posted by hifinsword | Jun 10, 2014 @ 02:45 PM | 1,894 Views
Recharging LiPo batteries - the 80% rule applies to the storage capacity or AMPERAGE of the BATTERY, NOT THE VOLTAGE of a battery. For a 1500mAh battery that means it should not be discharged more than 1200mAh (0.8x1500 = 1200, or 80% of 1500mAh). You won't know that until you recharge the battery. A good charger will tell you how many mAh it took to completely recharge the battery back to 4.2 volts per cell. It should then be at the full capacity of 1500mAh.

A good rule of thumb to use for how far to discharge or fly a battery, is the nominal voltages associated with each cell, i.e. 3.7 volts per cell. If you don't go below 3.7 volts per cell, you won't hit Low Voltage Cutoff (LVC) and damage your LiPo battery. Go below the LVC and you will most likely be putting back more than the 80% amp carrying capacity of your battery - NOT GOOD!

If you think you will be staying with this hobby, I recommend buying a quality BALANCE charger and stop using the cheap stock chargers that come with most RTF, ARF & BNF combos. They are OK in a pinch or on a trip where you don't want to carry a full blown charging setup. I won't recommend a charger or brand. New ones come out all the time but a good place to start is searching RCGs, or go to sites such as John Salt's for suggestions. http://www.rchelicopterfun.com/rc-battery-chargers.html
Posted by hifinsword | Jun 03, 2014 @ 02:29 PM | 2,128 Views
Symptoms:
If you've tightened all the screws involved in the V913 Main Blade Holders, and it looks warped, you've probably mixed up the aluminum plate parts of the main blade holder.

Discussion:
One of the aluminum plates on the V913 main blade holders has an extra hole each side of the opening that lines up with a plastic pin on the corresponding plastic parts of the blade holders. When changing the main blades, it's easy to put the wrong aluminum plate on the blade holders.

Cure:
Swap the aluminum plate with the extra hole over the plastic parts that attach to the main blades over the proper part. They will fit flush when tightening down the screws.

Or you could buy the new aluminum bling Main Blade Holders/Grip at Hobby-Direct.com.

Link:http://www.hobby-direct.com/v913-cnc...grip_g370.html
Posted by hifinsword | May 28, 2014 @ 02:41 PM | 2,016 Views
I am using the FX052 tail motor and assembly rather than the stock V913 motor and assembly on both my V913s currently. One is on a raised and extended CF tail boom. The other is on a stock metal V913 tail boom.

The FX052 tail main and pinion gear sizes, and gear ratio allows the tail motor to work more efficiently than the stock V913 tail motor gears. I'm hoping it will last longer than the stock motor. I have 31 and 12 flights on each as of 12 June 2014.

I feel the FX052 tail motor gives me better tail control. The V913 tail boom is 10mm and the FX052 tail boom is 12mm so the replacement assembly needs to be shimmed onto the 10mm boom. Steve_ discusses the FX052 tail motor and assembly more here on Page 161 Post 2404: http://www.rcgroups.com/forums/showp...postcount=2404

To use the FX052 tail motor you must also use the FX052 tail gear assembly. The tail motor mounts (screw holes) and the pinion gear are different from the stock V913 gear assembly. The FX052 tail motor pinion gear is too large to fit thru the opening of the V913 gear housing.

The FX052 tail gear assembly fits on a 12mm tail boom and the V913 uses a 10mm tail boom. Before you shim the FX052 tail gear assembly onto the V913 tail boom, you must melt a hole in the left side of the gear assembly to match the hole in the V913 tail boom or if using the CF boom, you will also need to make a matching hole for a screw in the CF boom.

I shimmed the FX052 tail gear assembly onto the V913 tail boom using thick...Continue Reading
Posted by hifinsword | May 13, 2014 @ 05:08 AM | 3,130 Views
These are the mods made to my #1 V913.

1) Swashplate mod. Hot glue and paper clip mod discussed in detail here: http://www.rcgroups.com/forums/showthread.php?t=2139667

2) Tail boom extended with raised tail motor mount to be parallel with main motor shaft. Boom and reinforcements to angle are CF tube and strips. The tail boom was extended about 1 inch, has 1mm thick sidewalls and is 10mm in diameter. The CF reinforcing strips are 4mm wide and 0.6mm thick. Horizontal stabilizing rods and vertical fins are removed. The details are discussed in my "Mini How To" blog here: http://www.rcgroups.com/forums/showthread.php?t=2152658

3) Tail motor and gear assembly are from the Feilun FX052 helicopter. Some more info here: http://www.rcgroups.com/forums/showp...postcount=1576
and here Steve_'s post here: http://www.rcgroups.com/forums/showp...postcount=2404

4) When WL Toys came out with the NEW BL PCB, BL Main Motor and a drop-in ESC in early Sept 2014, I replaced the main motor and PCB with the NEW parts. As of 14 Sept 2014, all is working well and I have gone BL on the Main motor. More info can be found in my post 2897 here: http://www.rcgroups.com/forums/showp...postcount=2897
The Main Motor used to be the Walkera Honey Bee CP 370 Super Motor (3S capable). On 12 June 2014 the motor burned itself up after 10 blazingly hot flights. Also fried was the PCB. Both motors do get VERY HOT on 3S batts.

5) The stock plastic battery holder is replaced with a...Continue Reading
Posted by hifinsword | May 13, 2014 @ 04:30 AM | 2,842 Views
This CAUTION is about removing and reinstalling the shaft collar upside down. When you replace the main shaft bearings or any part on the main shaft in most of these RC model helos, you may end up removing the shaft collar too. It's very easy to put the shaft collar back in upside down. One side has a small ridge and the other is flat. The ridge side goes down against the upper bearing in the upper part of the frame. When I say a small ridge, I mean very small, like about 1mm. If installed the wrong way, you will get too much vertical play in the main shaft.
Posted by hifinsword | Apr 23, 2014 @ 01:47 PM | 2,673 Views
I used carbon fiber (CF) tubing to make my V913 tail boom lighter and at the same time raise it to the same level as the main rotors. This should give the tail motor more authority because of more leverage against the main motor torque. Due to both rotor shafts being at the same level, the right lean has been eliminated. Less work for the tail motor means longer motor life as well.

I used the FX052 tail motor and assembly rather than the stock V913 motor and assembly. The parts for the FX052 tail motor and gear set are becoming hard to find. Here's a link to my post on where to find them as of June 2014. http://www.rcgroups.com/forums/showp...postcount=2530
The FX052 tail assembly main and pinion gearing allows the tail motor to work more efficiently. I'm hoping it will last longer than the stock motor. I already feel the better control the FX052 tail motor gives me. The V913 tail boom is 10mm and the FX052 tail boom is 12mm so the replacement assembly was shimmed onto the 10mm boom. Steve_ discusses the FX052 tail motor and assembly more here: http://www.rcgroups.com/forums/showp...postcount=2404

To use the FX052 tail motor you must also use the FX052 tail gear assembly. The tail motor mounts and the pinion gear are different from the stock V913 gear assembly. Also the FX052 tail gear assembly fits on a 12mm tail boom and the V913 uses a 10mm tail boom. Before you shim the FX052 tail gear assembly onto the V913 tail boom, you must melt a hole in the left side of the...Continue Reading
Posted by hifinsword | Apr 04, 2014 @ 07:03 AM | 3,935 Views
Discussion: These mods or ideas to improve FF (or FFF) in the V913 can be applied to most helos. They fall into either adding movement to the servos, or moving the Center of Gravity (CG or COG). Either the servo movement is enough to force movement in the intended direction or adjustments can be made to bias the movement in the intended direction. It can be done by adjusting, modifying or replacing servos that do not have enough force or movement to do the job, mechanical adjustments elsewhere, or by moving the CG.

1) Push the rate button on the upper left shoulder of the Tx. This will give the servo arms more movement. Pushing the TURBO button on the upper right shoulder of the Tx also gives the servos more travel but it is only as long as it is pushed. It can be modded by making it a switch thereby enabling it ON permanently as long as the switch is in that position. See the post here on modifying the V912/913 Tx. http://www.rcgroups.com/forums/showp...postcount=6889
Paragraph 5 (c) below applies.

2) MECHANICAL TRIMMING: Adjust (extend/lengthen) the ELE servo connecting rod for a forward bias of the elevator travel. This is my favorite method for improved FF. This can be done with the trim switch electronically or mechanically by adjusting the servo connecting rod or both. To mechanically adjust the servo connecting rod, follow the steps in my blog here http://www.rcgroups.com/forums/showthread.php?t=2109345 . Once the helo is hovering steady in one spot, you can...Continue Reading
Posted by hifinsword | Apr 04, 2014 @ 06:03 AM | 3,779 Views
Update: As of August 2014, Heli-Factor has the aluminum upgrades to the V913 swashplate. It is available thru HobbyDirect. Also available are an Aluminum Main Blade holder and a Rotor Head or Hub.
Aluminum upgrade swashplate link:http://www.hobby-direct.com/v913-cnc...late_g371.html

If you haven't modded the V913 swashplate, the odds are you will sooner or later, or give up flying the V913. This is a "MUST DO MOD" in order to fly the V913. I've tried to consolidate the most popular ones here for future reference.

1) The ever popular paper clip + hot glue mod by nmemennth
http://www.rcgroups.com/forums/showt...6#post25163313

2) The copper tubing and wood screw mod by dan2pkheli
http://www.rcgroups.com/forums/showp...postcount=1564

3) The CX4 CNC swashplate mod by fuzzyguy. This link is to his post in modding the V913 top frame plate and the anti-rotation bracket.
http://www.rcgroups.com/forums/showp...postcount=1185

Two aluminum swashplates are available for fuzzyguy's swashplate mod.

Link to the LynxHeli.com aluminum swashplate
http://www.lynxheli.com/product_info...ducts_id=23005

Or if you prefer, a link to the Xtreme.com aluminum swashplate
http://www.xtreme-production.com/xtr...oducts_id=8378

Any questions on the swashplate can be better answered on the Main V913 thread at RCGs by those with much more knowledge than I have. The link is http://www.rcgroups.com/forums/showt...91676&page=189
Posted by hifinsword | Mar 30, 2014 @ 02:53 PM | 3,005 Views
I wrote down some notes earlier thinking it would help when using a 3S batt on the V913. This blog entry is for using a main motor that is designed to run on 3S batts instead of the stock 2S batts, the stock motor and the F45, etc. replacement motors we have been using. If a 3S designed motor can be made to work with the existing PCB, it should provide more power and hopefully longer flight times than the stock motor provides.

A. 3S TAIL MOTORS
If a tail motor designed for 3S voltage could be found, the ideas should also work for it. In my limited search for 3S tail motors capable of handling 11.1 volts, I've found these candidates. One is the Heli-Max N60 tail motor for the Heli-Max Axe CP. http://www.rcplanet.com/Heli_Max_N60...p/hmxe9553.htm
But at $24.99 each, it's too expensive for my taste. The other is the N60 tail motor for the Blade BSR at $9.99 but it has terrible reviews. http://www.horizonhobby.com/products...sr-EFLH1322#t3
If anyone knows of a better tail motor that might work, please post here.

B. TIPS FROM OTHERS
I got these tips from FlyingTape and Vicio911. I have no electronics knowledge to know if this will work. But from their posts, I have no reason not to believe that it won't, so I'm giving it a try.

Link to FlyingTape's posts on the V912 forum:
link to diodes: http://www.rcgroups.com/forums/showp...postcount=4234
link to heat sinks: http://www.rcgroups.com/forums/showp...postcount=4177
link to 3S batteries and connectors: http://www.rcgroups.com/...Continue Reading
Posted by hifinsword | Mar 30, 2014 @ 07:03 AM | 3,037 Views
This is a post of "hard-to-find", uncommon parts and the new Aluminum Bling for the V913.

STOCK PARTS:
1) The V913 locking collar or which feala.com calls the "V913 helicopter parts Aluminum sleeve on the hollow pipe". There are some cautions when installing this item here. http://www.rcgroups.com/forums/showp...postcount=1811

2) A V913 basic "set of screws" for the V913.

3) The V913 Flybar pin. Which feala.com calls "the small iron bar for fixing the top bar".

4) The V913 main blade grip sleeves and feathering shaft, which feala.com calls the "Copper sleeve on the main blade grip set and main shaft + Iron stick in the blade grip set".

5) The V913 front LED with wires, also called at Feala.com "the small light in the head".

6) The V913 Main Blade Nuts and Bolts.

7) The new aluminum V913 Main Blade Grip/Holder.

BLING!
8) The new aluminum V913 Swash Plate.

9) The new aluminum V913 Main Hub or Head

You can find the 1st 6 of them here: http://feala.com/WLtoys-WL-V913-rc-h...V913-parts.htm
Linparts.com also carries them but the shipping charges may be a little higher.

Items 7-9 can be found at Hobby-Direct.com but they will not be available for order before early July 2014....Continue Reading
Posted by hifinsword | Feb 21, 2014 @ 11:46 AM | 2,672 Views
To parallel charge any batteries, you will need a charger with a power supply (can be included or added on) and a parallel charge cable/board. I don't remember where I bought my ready-made parallel charging cable but BuddyRC.com should have them. A balance cable won't do you any good until you start using multiple cell batteries. A parallel charge cable is all you need for 1S batteries since there is no balance plug on 1S batteries.

When I charge multiple 1S or any batteries for that matter, always bring them up to the same voltage first before plugging them in. For instance, if I have 3 batts, 1st is at 3.71volts, 2nd is at 3.80volts and the 3rd is at 3.94volts, I put the 1st one on and charge to 3.8ish (within 0.1 volts). At that point I stop the charging and add the 2nd battery. When the 1st and 2nd are close to 3.94volts I stop the charging and add the 3rd battery and charge to 4.2volts.

If all the batts are 500mAh batts, I can charge at 1C using 1.5Amps or 1500mAh on the charger. I usually charge less than 1C to keep the heat down and extend the batt's life. But if doing the above procedure and starting with the 1st batt alone, I start at 300 or 400mAh until the 2nd batt is added. Then you can increase the amperage to whatever you calculate the rate you want. With 2 x 500mAh batts, I would charge about 700mAh and after adding the 3rd batt I would bump up the amps to about 1200mAh. The total at 1C would be 1500mAh or 1.5Amps but I prefer less than 1C.

Higher rated...Continue Reading
Posted by hifinsword | Feb 21, 2014 @ 11:01 AM | 2,940 Views
Discussion: This procedure is intended for Fixed Pitch (FP) helos pilots to set up their helo to fly a stable hover relatively hands-free. It is for helos with only 2 servo links to the swashplate.

Generally Collective Pitch (CP) helos must have a level swashplate. Many first time FP pilots make the mistake of trying to level the swashplate of their FP birds. A level swashplate may, or may not allow your FP bird to hover hands off. What is important is whether or not you can enter a stable hover hands-free with your helo, regardless of the swashplate position, level or not.

There are FP conversions helos that have FP heads on CP frames, and have 3 servo links to the swashplate. This procedure does not apply to them or CP helos.

Step 1: Zero out any trim to the Aileron (AIL) and Elevator (ELE) on the transmitter (Tx) controls. If the Tx has sub-trim in a menu or sub-menu setting, zero that out also.

If you are only adjusting for drift, skip to Step 3. This assumes servo arms are already adjusted at 90 degrees to direction of travel on all servos.

Step 2:
(WARNING: If replacing servos, do not attach servo arms to servos, or links to servo arms until the 90 degree position is determined. A servo arm moving against another part may cause jamming and break the servo.)

(WARNING: Do not move servo arms with power applied to servos. It may damage the servos by inducing a overcurrent situation.)

Turn on the helo and bind. Note any servo arms not at 90 degrees to the...Continue Reading
Posted by hifinsword | Feb 20, 2014 @ 03:28 PM | 3,095 Views
This is my favorite link for a 'how-to' when it comes to a cheap method of balancing main blades on a helicopter. It is a blog entry on Chap1012's blog.
http://www.rcgroups.com/forums/showthread.php?t=1442509
Posted by hifinsword | Feb 12, 2014 @ 05:58 PM | 2,754 Views
John Salt's site on Helicopters. Great info for the beginner.
http://www.rchelicopterfun.com/

CaptJac's "3D is NOT for everyone" forum on RCGs.
http://www.rcgroups.com/forums/showthread.php?t=1901484

NoFlyZone's "Beginners Guide to Motor and Prop Selection" forum on RCGs.
http://www.rcgroups.com/forums/showthread.php?t=1136470

FliesLikeABeagle's software to pick motors and props.
http://flbeagle.rchomepage.com/softw.../webocalc.html

Sandancer's Build Log on the Schottky Bus-Tie Circuit.
http://www.rcgroups.com/forums/showthread.php?t=2120160

HeadUpRC's link to airplane props.
http://www.headsuprc-info.com/propeller-faq.html

THE ROLE OF THE BEC IN YOUR ELECTRIC PLANE
by Ed Anderson
aeajr on the forums
http://www.rcgroups.com/forums/showp...8&postcount=23

"JST" connector confusion - the real story by John i.e. jj604 on RCGs.
http://www.rcgroups.com/forums/showthread.php?t=1493712
Posted by hifinsword | Feb 12, 2014 @ 05:33 PM | 2,757 Views
Medium voltage Battery & ESC connectors - which gender contacts go where?

IMPORTANT NOTE: The gender of all RC connectors is determined by the plastic housing, NOT the metal terminals.
And that's confusing because some connectors use both male & female housings in the same connector!

HXT 4mm connectors have male AND female metal terminals in the positive and negative side of the housing connector. They are also known as 4mm Banana connectors. The HXT/4mm positive red wire of the battery uses a female housing and a female metal terminal inside. The HXT/4mm negative black wire of the battery uses a smaller male plastic housing and male metal terminal inside.


SuperTigre connectors look the same as HXT/4mm Banana connectors, but have ONLY male, or ONLY female 4mm metal terminals in the battery side of the connectors, or in the ESC/device side.

SuperTigre batteries have metal female terminals inside male/female sides of the housing. The battery's negative side (black wire) is the male (smaller) housing; the battery's positive side (red wire) is the larger (female) housing. The SuperTigre ESC or device connector has male metal connectors inside male/female sides of the housing. The negative side (black wire) the ESC/device is the female (larger) housing; the positive side (red wire) is the smaller (male) housing.

EC2/3/5 battery connectors have male (smaller) plastic housings with metal female terminals inside. EC2/3/5 ESC or device connectors use a larger (female) housing with male terminals inside. The ESC larger female plastic housing/connector fits around the battery male plastic/housing connector.
Side note (EC3 = 3.5mm metal terminals)

Deans connectors have the same size housings. Batteriers have metal female terminals/connectors and ESC/devices have metal male terminals/connectors that protrude out from the connector.

Another whole category of connectors have to do with 1S batteries, JST connectors, balance connectors and servo or miscellaneous connectors. The best RCGs resource for such things is jj604's forum/thread on them here: http://www.rcgroups.com/forums/showthread.php?t=1493712
Posted by hifinsword | Feb 12, 2014 @ 05:18 PM | 2,850 Views
Charging Calculator
http://www.progressiverc.com/chargingdemand This link shows the time it takes to parallel charge multiple batteries and gives the charger requirements.

2ZO - RC modular Power Supply
http://www.rchelicopterfun.com/rc-power-supply.html

5 Outlet Universal Charge Cable from BuddyRC.com has a blank pair of wires plus 4 most popular connectors (EC3, Deans, XT60, 4mm bullet) $6.95 compared to TaildraggeRRC has a 24" w/JST plug (gold-plated banana, Silicone main 10AWG) $15.99 http://www.buddyrc.com/catalogsearch/result/?q=epb-9411

Cheap Battery Tester / Indicator $3.10 [/B]at Banggood.com SKU071659. Face balance or charge connector so you see the metal pins in the plug. Use left most pins on tester in plugs of battery with tester facing you so you can see the readout. This only gives you a voltage, no alarm.
http://www.banggood.com/buy/sku071659.html

Cheap Battery Alarm / Indicator $5.25 at Banggood.com SKU014552. Button on top changes alarm threshold. This gives you a voltage readout and an audible alarm at whatever voltage you set for the alarm.
http://www.banggood.com/buy/sku014552.html

Bench testing servos
I've found these 2 items worth it for bench testing servos. If you are having servo problems, this will help determine if it's the servos, or something else causing problems.
Servo Tester $4.10 http://www.banggood.com/Wholesale-EK...r-p-66240.html
Battery box with 3 wire standard servo connector $1.81
http://www.banggood.com/Battery-Box-...g-p-77395.html
Posted by hifinsword | Feb 11, 2014 @ 07:33 PM | 3,207 Views
Unplug the motor. I used to remove the bottom tray by dropping it in the front and leaving it hinged at the back. I would take the tail boom braces off but I leave the 2 screws at the back of the bottom plate loose and let the bottom plate drops down hinged at the back. Now I remove all 6 screws along the bottom of the bottom tray. It's easier to let the tray dangle from the wires and swivel it 90 degrees to get it out of the way. Either way works.

Remove the 2 screws on the top of the motor. Remove the screws on the heat sink plates on the sides of the motor and loosen some screws on the side plates to pull the plates apart. The motor drops out of the bottom.

There have been instances of the motor starting up as soon as power is applied without the switch being on or being bound to the Tx. If tested outside, your V913 could fly away and possible hurt someone or property. If tested inside, it will more than likely hurt someone or damage property.

CAUTION: Make sure the rotor blades not engaged. I recommend checking the motor while plugged into the PCB but not installed. This should be done even if there was no crash or no apparent damage. This is done before installation to ensure the motor isn't faulty or the PCB damaged in any way.

Or you could remove the blades and check the motor installed. If the motor spins in the reversed direction, as commonly found in alternative motors, you will discover this early and save yourself a 2nd installation. If you choose a...Continue Reading