New bird

[SkyKraken]

Originally Posted by oleost

Still waiting for my new battery before installing the 2s setup with 8800kv spin and Talon 15 esc with an extra voltage regulator. (Yeah, I know about the wrecked battery connector, have to solder a new EC2, but having problem with pushing these small ones onto the plugs, should wich way should I get them in?)

If you are talking about the EC2, you press the connector(s) in from the back (wire side) and they will "click" nicely in place, they also rotate in the housing to keep the wires from taking flex.

Solder the wire into the female (not the bullet shaped parts those are device side, not for batt).
Do not get solder on the outside of the metal connector.
Positive + (Red) is marked with a plus on the plastic housing and has a square-ish shape.
Push the connector into the plastic housing from the back of the housing until it clicks.
It takes very little pressure to "click" the connector into the plastic housing, you should not have to force it.

No metal will be exposed on either side of the ec2's.
No metal will be exposed on the device side or the battery side, or the backsides where wires are soldered.



What pinion (how many teeth) are you planning on running on that 8800?
Did you consider the new Spin 8500 it has much more torque.
Can't tell from your picture, but are you certain that is an 8800, its diameter looks too large, look like a 8k maybe.

The main gear is 120 teeth correct?

And the Talon is going to output 5.5v.
I assume stock Walkera servo's can handle that, they were designed for 1S.
The tiny coreless motors inside the servos might fail early under that high of voltage.
-- Looking at your picture, you need to shorten all the wires.
*Motor wires short as possible, but careful not to flex the mag-wire too much, its brittle.
*Power leads also, short as possible.
I don't think the ESC to gyro length matters, but you have a lot there.

Looks good.. When are you batteries due?

[oleost]

Originally Posted by SkyKraken

If you are talking about the EC2, you press the connector(s) in from the back (wire side) and they will "click" nicely in place, they also rotate in the housing to keep the wires from taking flex.

Solder the wire into the female (not the bullet shaped parts those are device side, not for batt).
Do not get solder on the outside of the metal connector.
Positive + (Red) is marked with a plus on the plastic housing and has a square-ish shape.
Push the connector into the plastic housing from the back of the housing until it clicks.
It takes very little pressure to "click" the connector into the plastic housing, you should not have to force it.

No metal will be exposed on either side of the ec2's.
No metal will be exposed on the device side or the battery side, or the backsides where wires are soldered.



What pinion (how many teeth) are you planning on running on that 8800?
Did you consider the new Spin 8500 it has much more torque.
Can't tell from your picture, but are you certain that is an 8800, its diameter looks too large, look like a 8k maybe.

The main gear is 120 teeth correct?

And the Talon is going to output 5.5v.
I assume stock Walkera servo's can handle that, they were designed for 1S.
The tiny coreless motors inside the servos might fail early under that high of voltage.
-- Looking at your picture, you need to shorten all the wires.
*Motor wires short as possible, but careful not to flex the mag-wire too much, its brittle.
*Power leads also, short as possible.
I don't think the ESC to gyro length matters, but you have a lot there.

Looks good.. When are you batteries due?

Thanks for the tips. Yes its an 8000kv engine, and I'm planning to use the same pinion that is in the original motor.

The servos fries out early with stock voltage output from talon 15. Thats why I have an voltage regulator that takes it down to 4.5

Don't know when the batteries comes. I ordered som hyperions 320mah that should be a direct fit. But the site is out of stock. And since shipping is at least 2 weeks its still a while to

[SkyKraken]

320 mAh batteries and the spin 8000, powered by a talon.
What kind of flight times do you think that will allow?

I think the 130 guys are getting around 4 minutes with 450mAh packs with the spin 8000.
So, your thinking 2 1/2 or maybe 3 mintues.

[oleost]

Dont know what flights times will be. Guess its one way to find out.

Just know that this battery will be a direct fit without any modifications etc.

If you know about a better choice for a battery I will probably order that5 as well

[SkyKraken]

I don't, it just hit me that the 8k motor is pretty thirsty and a 320 is a small source.
I hope that the weight of the v120 mixed with just 320 mah, makes for longer flight times.
You get into a problem where more battery is more weight and the 120 disk just can't handle it..
So, what good is a fat 120 that flies like poop because its too battery heavy for its size.

Says the guy who put 3S on a v120.
3S,

2s 8k gy280 on v120d02s, but using a blHeli plushy esc.
Assembled this today, because you had me thinking about it.
All I need are your batteries that fit the v120 tray and wallah a good test.

[oleost]

Where are you buying them?

I also ordered 1 nano-tech 370mah to test, but dont think they are a direct fit

EDIT, just got shipping confirmed email from scaleflying.com for the hyperion batteries, should expect them within 2-3 weeks.

[SkyKraken]

Haven't, there is the rub, I made it that far on parts that were on the bench.

Batteries, Nope haven't even looked, I was going to scrounge around, maybe I can make a 2s out of a couple 1s's.

Assembly is fun, devils in the details, like making it fly...

Sorry, you will most likely be the first test pilot on that recipe.

I happen to have a nano. Little big but darn close..

[oleost]

Have you tried fastening it with some velcro and some loose ziptie to secure it more?

[SkyKraken]

The 370 is too heavy and ill fitting, I'd go back to 1S before flying that.
3D would be sloppy and erratic trying to fly a pack that is 1/3 the weight of the heli.

That Hyperion battery that fits the tray and spec's about the size of a 600 or 700 mah pack is the most important part of this 2s conversion. IMO

The v120d02s does not improve with extra weight and power.
The weight makes it fly poorly.
The added power along with the extra weight causes the front "B" bevel to fail.
If a metal bevel is uses, the main gear takes the damage because the frame is weak.
The frame is flexible, adding power just allows harder maneuvers to flex the frame
The boom supports are light weight but weak and the tail can flex under load too.

A bone stock v120d02s is a solid flier, a tad weak if you aren't proficient on collective.
Adding more power, in my opinion, needs to be done carefully or the inherent qualities of the v120 are lost.

I wouldn't want to ruin the fun of the build and trying modifications is a large part of the fun.
Yet if flying the v120 is more important then the fun of the build and experimentation, leave it stock.
If you have to have more power, a big 1S.

note; (Main: A; then B against the main; C and D on the tail respectively)

Time is ticking, you should have your packs in 1 to 2 weeks now, woohoo!

[SkyKraken]

Found a smaller battery in the pile, gave it a test.
Hovered about 3 minutes on the 300 mah pack.
So, hopefully 320 of a higher quality battery will allow 3 minutes of flight for you.

300 size vs the 370. the weight is significantly more also.



Motor and ESC came down the perfect warm temperature for hovering.

No real feel for the power just hovering, head-speed was lower then I normally like.
But, if it doesn't bog in flight, I wouldn't want more HS at cost of flight time.

[oleost]

May I ask what headspeed your running?

If I remember correctly I set it governed and 4000, 4500 and 5000 in headspeed in the ESC govenor.

[SkyKraken]

If I remember you were going to run the stock 10T pinion?
I don't remember exaxtly what a stock v120d02s came equipped with.

Anyhow..

You might get much more flight time then I considering our gearing differences.

You are probably setup something like this:



I tossed in a couple more teeth to kick it up to this:

[oleost]

OMG.

These EC2 connectors are PAIN

So, 2. try and still no go on these connectors, no matter what I cant get these to click to place, both on the ESC side and battery side.

[BillG]

I use the EC5 version of those connectors. have always pushed them in from the other side than what you show. Use a small tool like a screwdriver to push them into the plastic. The bullet has a small chamfer to help it go in from the other side.

BTW, those are awful large for the V120 (IMO)....

GL

[oleost]

Originally Posted by BillG

I use the EC5 version of those connectors. have always pushed them in from the other side than what you show. Use a small tool like a screwdriver to push them into the plastic. The bullet has a small chamfer to help it go in from the other side.

BTW, those are awful large for the V120 (IMO)....

GL

Thanks, that did work.

I misread what SkyWalker wrote and I had seen another video doing it the way that I did....

Edit delayed. I don't get that damn pinion of the stock motor. So ordered myself both a new pinion and a pinion removing tool for the future.

[SkyKraken]

10T is good. (possibly best choice for durability). Wasn't impressed by the headspeed.

11T is better, it can ruin the bevel running off the main on a touch (no slipper).
11T also when using metal gears can ruin the main gear. Getting about 1 minute per 100 mah.

12T starts to oscillate, too much vibration the little bird can't handle those rpms.

That 320 hyperion battery fits perfectly, but the balance wires are crap and the balance plug is laughable.
The main wires are noodle, which is good, but they are quite long and I'm not a jst fan.
I might modify the pack to make this prefect size pack, be less crappy as it is in hyperion form.

Edit: Cut that nasty hyperion balance tap off. Using a cleaner 2S balance plug.

[SkyKraken]

I wish that 320 mah pack was stretched longer in length to add 100 mah,

109 AUW. Good fun. I fear I will puff the small pack too soon.

Settled on this ESC setup:



.