Gaui X4 II -- What's your setup?

[Jeff_Barrett]

14T pinion is the smallest you can get from Gaui ... realistically, you'll want a 13T for a 550kv. I would find something just slightly lower kv and run a higher pinion.

2x 2000mah should work nicely. Lots of room on that battery tray I think depending on the dimensions of hte pack.

Your flight time will likely be down around 3 minutes as you noted.

[Steemo]

Mr Mel calc puts best performance h/s on external gov at around 2800 on the listed setup.

Really think only 3:00 on 2 x 2000 mah packs in 12 series? That's the same watt-hours as one 6s 4000mah.

Yeah the 4025 is a beast but will only pull what it needs when it needs it, won't be pulling anywhere near it's rated 2800w constant on this machine. Might see that on peaks.

[Matt Nasca]

Originally Posted by smillar

Sorry to hear about your X4 Jeff. Hopefully this is the end of you run of bad luck.

It is great to hear they are providing the parts free of charge. At least they have fixed the problem before most people have put the heli together.

Matt,
Have you got any videos of you flying the X4? That would be really cool to see you throw it around.

Not yet, yesterday I was trying to get my whole fleet ready for a funfly this coming weekend. I'll get some video during that!

[Jeff_Barrett]

Originally Posted by Steemo

Mr Mel calc puts best performance h/s on external gov at around 2800 on the listed setup.

Really think only 3:00 on 2 x 2000 mah packs in 12 series? That's the same watt-hours as one 6s 4000mah.

Yeah the 4025 is a beast but will only pull what it needs when it needs it, won't be pulling anywhere near it's rated 2800w constant on this machine. Might see that on peaks.

I use the raw calculated headspeeds rather than the suggested governed ones. Not all govs are equal in this department.

I'm guess 3min of hard flying on that setup ... but there's only one way to find out.

[Jeff_Barrett]

Originally Posted by Matt Nasca

Not yet, yesterday I was trying to get my whole fleet ready for a funfly this coming weekend. I'll get some video during that!

Which one, Matt? Where?

As you know, I'm only a few hours to the North of you. I am hoping to attend the one in Coon Rapids at the end of August ... I know Matt & Amy Botos will be at that event as well.

[Colonny5]

Originally Posted by Matt Nasca

Not yet, yesterday I was trying to get my whole fleet ready for a funfly this coming weekend. I'll get some video during that!

Can you share a photo of your X5 and X4II together for a size reference when you get the opportunity?

[Matt Nasca]

Originally Posted by Jeff_Barrett

Which one, Matt? Where?

As you know, I'm only a few hours to the North of you. I am hoping to attend the one in Coon Rapids at the end of August ... I know Matt & Amy Botos will be at that event as well.

It's at the 3DRC field in Elk River. The event is called the IceBreaker/Spring Fling. Are you talking about the Great Northern Pitchfest? That is at this same field.

http://www.3drcmn.com/event/11

Originally Posted by Colonny5

Can you share a photo of your X5 and X4II together for a size reference when you get the opportunity?

Sure, I'd be glad to when I get home tonight. This is from the weekend. Not a good comparison but it shows height.

[FailureToFly]

I'd imagine that the 15T 6mm pinion will allow you to gov at 2700...HS could be up to 3000rpm with that pinion so it'll provide enough headroom. The 14T could even work for about 2600 (max HS could be ~2850 on 14T).

One of the X5 guys uses the 4025 on 12S and gets 4m slights on 550mm blades. He says it's a beast.

I run the 4035-500 with two 2200 6S packs and get 3m30s of crazy and 4m30s of mild 3D with the X5 on 520mm blades.

Whilst a 12S setup would be cool, from what I've seen on video, the X4 II with the X5 motor won't really need any more power when running 425/435mm blades. If you're going to run 465's etc then 12S makes more sense and the bird will fly better.

I found the 4020-910 motor to bog a little too much on the X5 so the closer you get to X5 blade size, the more bog will creep in...it's not bad by any stretch (X5 is very powerful and fast) but the X4 II seems pretty much unboggable totally stock which is what is attracting me.

Originally Posted by Steemo

Mr Mel calc puts best performance h/s on external gov at around 2800 on the listed setup.

Really think only 3:00 on 2 x 2000 mah packs in 12 series? That's the same watt-hours as one 6s 4000mah.

Yeah the 4025 is a beast but will only pull what it needs when it needs it, won't be pulling anywhere near it's rated 2800w constant on this machine. Might see that on peaks.

[Matt Nasca]

[Steemo]

Originally Posted by FailureToFly

I'd imagine that the 15T 6mm pinion will allow you to gov at 2700...HS could be up to 3000rpm with that pinion so it'll provide enough headroom. The 14T could even work for about 2600 (max HS could be ~2850 on 14T).

One of the X5 guys uses the 4025 on 12S and gets 4m slights on 550mm blades. He says it's a beast.

I run the 4035-500 with two 2200 6S packs and get 3m30s of crazy and 4m30s of mild 3D with the X5 on 520mm blades.

Whilst a 12S setup would be cool, from what I've seen on video, the X4 II with the X5 motor won't really need any more power when running 425/435mm blades. If you're going to run 465's etc then 12S makes more sense and the bird will fly better.

I found the 4020-910 motor to bog a little too much on the X5 so the closer you get to X5 blade size, the more bog will creep in...it's not bad by any stretch (X5 is very powerful and fast) but the X4 II seems pretty much unboggable totally stock which is what is attracting me.

Hehe I know it's a bit extreme but I've always loved toying with the idea of a 12S 500 (425 class) so far there are 0 12S capable motor options in the right Kv range that will fit the Align 500 Pro airframe so when I saw this heli runs a 50mm can motor as stock it got me thinking.

Thanks for the feedback. Sounds like this will all work the way I want provided I can figure out which packs are going to fit best. I'm thinking I'd either need 2 short stumpy packs one in front of another OR 2 long wide flat packs side by side. Doesn't seem to be too many of those in the 1800-2200mAh range out there, they all seem to be average length and fairly square.

[S.Millar]

Thanks for posting these pictures Matt. It looks bigger than I expected. I can see why they decided to go with the X5 power system.

[Matt Nasca]

Originally Posted by smillar

Thanks for posting these pictures Matt. It looks bigger than I expected. I can see why they decided to go with the X5 power system.

It's very light though. Also the blades on the X4II are 465mm.

[FailureToFly]

Do you mean it flys light?

The published weights are:

X4 II: 1780g (give or take 5% with electronics but without battery)
X5: 1850g ±3% (Equipped with Blades and all electronic gears except Battery).

As it's only 70gms I would have thought the X5 would fly alot lighter and be more nimble due to the lighter disk loading etc.

I was kinda expecting a pretty high disk load with loads of HS/power to compensate with the X4 II.

[Matt Nasca]

Originally Posted by FailureToFly

Do you mean it flys light?

The published weights are:

X4 II: 1780g (give or take 5% with electronics but without battery)
X5: 1850g ±3% (Equipped with Blades and all electronic gears except Battery).

As it's only 70gms I would have thought the X5 would fly alot lighter and be more nimble due to the lighter disk loading etc.

I was kinda expecting a pretty high disk load with loads of HS/power to compensate with the X4 II.

My X5 is 12S and is definitely much heavier than the X4 II when RTF.

[FailureToFly]

Yeah the 12S version will add a frew hundred grams on top of the base difference I'd imagine.

Originally Posted by Matt Nasca

My X5 is 12S and is definitely much heavier than the X4 II when RTF.

[Jeff_Barrett]

The X4II does fly light though.

[Flydynamics]

Matt I guess the 465mm blades fit without any mods right ?
I remember reading about a set of 465mm blades on NX4 so it should be OK right out the box ?!?...

[Matt Nasca]

Originally Posted by shotgun34

Matt I guess the 465mm blades fit without any mods right ?
I remember reading about a set of 465mm blades on NX4 so it should be OK right out the box ?!?...

Fits perfect, no mods necessary!

[Steemo]

Originally Posted by FailureToFly

...The published weights are:

X4 II: 1780g (give or take 5% with electronics but without battery)
X5: 1850g ±3% (Equipped with Blades and all electronic gears except Battery)....

So if you run an X5 boom and TT with 470-520mm mains is there any advantage in having an X4II over an X5?

I'd imagine the X5 would perform much better with Std size servos.
If they are similar weight why not run an NX4/X4II boom and TT on an X5 if you want a robust 425-460 class heli?

[FailureToFly]

You make some good points as I myself have been swinging one way and the other for a bit now regarding these two birds.....I'm still in two minds about what to do as I was considering doing up (down? ) the X5 like the X4 II to test it out and see if I like the size...it was going to cost me about $100 to test the concept though (TT, boom, pinion, boom supports, blades etc)

The cost of the X5 canopies ($70-$90) has cooled the idea a little (espec compared to the X4 II canopy being about $45) but I guess full sized servos would be pretty robust in a 425mm bladed crash...and the X5 grips are bigger than the X4 so it possibly would come out better off and might not cost any more money to repair.

The X4II battery arrangement does seem pretty good as the X5 is a tad limited...3800 to about 4500 is about it (where you can use 2200-5000 on the X4 II) but it's no biggie really.

Going the other way and doing up a X4II to a quasi X5 might be a bit more of a struggle without X5 grips and some HV mini servos with 10+kg of torque. I found the Align DS615's really nice with the X5 so halving the pushing/holding power when using minis might make the heli less nimble/stable if you're trying to run 500mm blades.

I guess I am interested in the X4 II as I'm just not that keen on maintaining two identical helis (I did it with two 450Xs and didn't at all enjoy it) so I'm leaning towards parting out the 6S X5 so I have a spare airframe for my 12S X5 and the electonic bits can go towards the X4 (ESC, motor, VBar) and eventually an X7 (20A BEC and servos).

That is my current plan at this present moment.

Originally Posted by Steemo

So if you run an X5 boom and TT with 470-520mm mains is there any advantage in having an X4II over an X5?

I'd imagine the X5 would perform much better with Std size servos.
If they are similar weight why not run an NX4/X4II boom and TT on an X5 if you want a robust 425-460 class heli?