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Old Jun 15, 2015, 02:14 PM
Ribble is offline
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Crash and learn
United States, PA
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Quote:
Originally Posted by Wasp09 View Post
Would anyone know the spec of the servo driving chips (MOFET?) marked .22 on the V911 RX?

Sorry. Looking for "Servo drivers". Was looking at how pretty the V911 board is and went adrift from there.

Tend to think dual N-Ch MOSFETs, but the circuit is a little hard to follow. And I would have to sketch it to a schematic and understand what is happening. Each servo uses two cross-connected MOSFETs on opposite chips for H-Bridge motor drivers?

Two more on other side of board.

Dual N-Channel 20 V (D-S) MOSFET (REASONABLE GUESS ONLY)
http://www.vishay.com/docs/71080/si1902dl.pdf


---
Motor drivers
Do not know (or remember) the specifications. But replacements are dirt cheap. Too cheap to only buy one or two.

I paid $3.75 for 50 shipped, received 23 days later. Ebay may be faster.
free shipping 50Pcs Taiwan IRLML2502 SOT-23 N Field Effect Power Mosfet Transistor 20V 4.2A - $3.90
http://www.aliexpress.com/item/a-fre...042910006.html


How to Replace a MOSFET (WLToys Minis & Micros)
http://www.rcgroups.com/forums/showthread.php?t=2014956
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Last edited by Ribble; Jun 15, 2015 at 07:48 PM.
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Old Jun 15, 2015, 06:59 PM
jakeaheli is offline
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Power Wires Re-Wire

Had another crash yesterday and the main power wires came off the connector.

Decided to route the wires at the back the PCB for more security.
That should do it!!

Also used a glue gun as some of you guys suggested last time to solidify the contacts so that none of that happens again
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Old Jun 15, 2015, 07:31 PM
Wasp09 is online now
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Canada, ON, Ottawa
Joined Jun 2009
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Quote:
Originally Posted by Ribble View Post
Sorry. Looking for "Servo drivers". Was looking at how pretty the V911 board is and went adrift from there.

Tend to think dual N-Ch MOSFETs, but the circuit is a little hard to follow. And I would have to sketch it to a schematic and understand what is happening. Each servo uses two cross-connected MOSFETs on opposite chips for full bridge motor drivers?

Two more on other side of board.

Dual N-Channel 20 V (D-S) MOSFET (REASONABLE GUESS ONLY)
http://www.vishay.com/docs/71080/si1902dl.pdf

---
Motor drivers
Do not know (or remember) the specifications. But replacements are dirt cheap. Too cheap to only buy one or two.

I paid $3.75 for 50 shipped, received 23 days later. Ebay may be faster.
free shipping 50Pcs Taiwan IRLML2502 SOT-23 N Field Effect Power Mosfet Transistor 20V 4.2A - $3.90
http://www.aliexpress.com/item/a-fre...042910006.html


How to Replace a MOSFET (WLToys Minis & Micros)
http://www.rcgroups.com/forums/showthread.php?t=2014956
Thanks for the response.

I am looking for Dual N + P Chanel 6 pin FETs to repair my WNCP RX. I have a donar V911 board (only works within an inch of the TX) and hope to retrieve something useful.

Stupid me smoke one of the servo drivers by not pushing the main gear in deep enough. The swash hit the collar.

I cannot find any 52907 equivalent,

XZ2132SL:

http://www.rcgroups.com/forums/showp...postcount=1008

or ST3621:

http://www.alldatasheet.com/datashee...P/STS3621.html

It is not fun to rewire a board to use a different chip these days when surface mount component is involved. I had a big cap to replace a surface mount on that board already.

It would cost me 1.5 V911 to get a new board or 3 V911 to get a new BL WNCPX BNF.


+++++++++++++++++++++++++++++++++++++++++++++++

Bought this:

http://www.aliexpress.com/item/FREE-...313831922.html

Same pinout but higher on resistance and lower max current. Hopefully good enough to run the servo motor. It may be slower but less likely to smoke again.
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Last edited by Wasp09; Jun 17, 2015 at 11:51 PM.
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Old Jun 28, 2015, 04:29 PM
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Hi all!
I'm new to this forum. Two weeks ago, I've ordered a V911-pro from banggood :-)
What will I need to do before flying when the heli arrive : oil or add graphite on some gears? (and which ones?)
I've seen I can add some liquid electric tape of the tail rotor engine wires, and some hot glue on electric board connection (although have none of them).
I've also bought the flybar paddle.
Regards,
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Old Jun 28, 2015, 06:32 PM
Ribble is offline
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Crash and learn
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Joined Dec 2011
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Quote:
Originally Posted by 36vwD6 View Post
Hi all!
I'm new to this forum. Two weeks ago, I've ordered a V911-pro from banggood :-)
What will I need to do before flying when the heli arrive : oil or add graphite on some gears? (and which ones?)
I've seen I can add some liquid electric tape of the tail rotor engine wires, and some hot glue on electric board connection (although have none of them).
I've also bought the flybar paddle.
Regards,
First fly the V911-Pro as it should be very stable. Do not modify anything, especially the flybar, without being able to fly it well.

Pencil graphite (or silicone lube) the flybar connection to mast. To adjust, turn the flybar screw in all the way, then back out until flybar bounces when end is bumped. Getting the flybar right is critical and will always be critical to making the V911 fly well.

Pencil graphite (or silicone lube) the main gear and motor pinion gear.

Use a pencil to draw circles around all ball links and where propellers attach to mast.

I use enamel nail polish to protect the tail motor wires at end of tail boom, as it is easy to apply. Stay away from the holes in the tail motor.

A paddle flybar will make the V911 less stable and somewhat wild.

Beware that changing propellers is very hard the first time you try it, and likely to reassemble wrong.

Eventually you will want to adjust the servo pushrod lengths. Be prepared to take many steps making it worse before it gets better. You have to first know what you want to change in how it flies and be able to tell if you are making it better or worse. There is interaction between Elevator and Aileron adjustments that will drive you crazy.
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Last edited by Ribble; Jun 28, 2015 at 07:09 PM.
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Old Jun 29, 2015, 09:17 AM
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Portugal, Lisbon
Joined Oct 2006
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I'm using the flybars that come in this set:

http://www.banggood.com/pt/WLtoys-V9...-p-942850.html

They add some momentum to the rotor, making the flying smoother without loosing agility. Particularly useful outside.
I tried the 3 types of flybars with my V911Pro and these ones give me the best flying experience.
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Old Jun 30, 2015, 11:27 AM
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Thanks Ribble and FranciscoB for your advices.
I bought this flybar paddle: http://www.banggood.com/WLtoys-V911-...-p-959157.html
I also remember that it's best to add electric tape on the flybar weights to prevent any loss on crash.
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Old Jun 30, 2015, 11:51 AM
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Quote:
Originally Posted by Ribble View Post
First fly the V911-Pro as it should be very stable. Do not modify anything, especially the flybar, without being able to fly it well...

A paddle flybar will make the V911 less stable and somewhat wild.

...
I second that.
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Old Today, 03:50 AM
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I felt the paddlebars' extra weight forced me to 'fly the paddles' instead of flying the heli. They resisted control input.
The extra weight also sheared teeth of of the maingear in minor crashes.

Erdnuckel2 did an outstanding job of making changes to the V911(and others), and meticulously documenting his results. Here's a link -

http://www.rcgroups.com/forums/showt...1591898&page=7
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Old Today, 05:03 AM
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Greece, Attica, Ellinikon
Joined Jan 2014
793 Posts
Hi all. Its been many months since I last flew my V911.

I tried it today but it is unflyable!

Here are some weird things that I noticed:
The canopy is shaking a LOT!

If I press down the flybar with my finger it only goes down one one end. In the other end it goes from up until flat.

Other that that servos move full travel via the tx and I have yaw authority and control. Actually I can only control yaw, move back and throttle when I fly.

Any ideas?

Here are some pics bellow, if you can find anything wrong.
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Old Today, 05:14 AM
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Greece, Attica, Ellinikon
Joined Jan 2014
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About the main gear I just saw it and fixed it. I didn't fly it like that. I took it off to tighten the tail rod screw, but put in on backwards. Now its ok.
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Old Today, 06:06 AM
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United States, AK, Ketchikan
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Does the fly-bar move and bounce freely with the dog-bones disconnected?

Your main-shaft may be bent. Does the swash feel the same throughout a full(manual) rotation of the blades? Try gently moving the swash up and down(with your fingers) while turning the head.

You can confirm that the shaft is straight by removing everything from it and then rolling it on a flat surface.
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