E720 anyone?

[Marlex]

Hi there

I was wondering why there isn't much to read here about the TT E720?

Personally, I really like the E720. I do not own one but I'm really looking into buying it. It looks good and seems to be a high quality product with good performance.

The only thing I don't really like about the E720 is the 140 swash which I heard isn't an optimal setup along with a flybarless system and a 3D smack flying style...

Cheers
Markus

[helicopter1]

I thought that the 140 deegre swash set up was better then the 120.

[Marlex]

I thought that the 140 deegre swash set up was better then the 120.

Yes, but for a flybarred head. The 140 swash has less interaction at elevator input. If you check a 120 swash heli from the side, you will notice that the ball links are in different distance to the main shaft, so the mechanical center of rotation is not where the main shaft is. This requires a pre-set mixing of the servos in order to electronically shift the CoR...




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[helicopter1]

Yes, I was talking about a fb heli as I do not own fbl heli. I did some reading and I found
that 120 swash is better for fbl.

[rotorwing cris]

Like the look of the E720 but the price is pretty steep.
Owen a X50 and love it. Think ill wait and see what the X50E looks like before
I commit. :roll:

[Turbo Dave]

Got my maiden flight done yesterday, The E720 sure feels great in the air, I had to do a custom swash in the vbar to get the 140 working properly.
Collective power is Excellent even though I have a temporary motor in there until my pyro shows up!

Can't wait to get some more flights on it to get the vbar tuned in to my liking (Way to sensitive at the moment).

[gwright]

Yes, I was talking about a fb heli as I do not own fbl heli. I did some reading and I found
that 120 swash is better for fbl.


That is some folks opinion. I keep reading those posts also and think about what they are saying, that 120 is faster,..which is due to the front servos moving slightly less during elevator inputs,..however, if all servos are the same speed and the front ones move less, you will have interactions as they reach their intended destination sooner, so I still can't get my hands around this concept of 120 being better. I'm not convinced, and quite the contrary I think 135 is far better as you never have differential travel between the servos when inputting any of the three primary control axis. Geometrically 135 is better, matching speed of travel 135 is better, and it will also develop less hysterisis over time as the front servos no longer have a shorter "lever" than the rear one. Maybe I'm just not bright enough to realize what the difference is, but I would argue 135 with equal geometry for all movements will always be better than 120 because of the possible differential in elevator inputs unless the front servos are slowed down to the same speed as the rear one for a given travel, plus the possibility of differing amounts of hysterisis .

[gwright]

Saw the post about the X50E. I'm flying a prototype now, 10S with various size packs, 3800's, 4350's, and 5000's, Hacker turnado 580KV, Hacker X80-3D ESC. The machine is very solid and smooth. Only have 15~20 flights on it so far and have only been playing with gearing and batteries and such to get the power system where I want it. A couple days ago was the first flights with the 3800's and a different pinion and I think this is where it will stay, so I can start actually flying it rather than working on power configuration and setup. 6 Minutes at 2200 and didn't even use 3000 out of the packs but some of that was spent taching and tweaking throttle/pitch, so probably will end up with a 6 minute timer with the 3800's and 7 with the 4350's. I think the 5000's are simply too heavy since they end up adding another 5 ounces over the 4350's and 8+ compared to the 3800's. It appears the common trend is 3300 to 3800 for 10S setups on 600's anyway, I just tend to like longer flight times than the norm, as evidenced by my usual 10 minute flights on the E720, that I can push close to 12 if I want to abuse the batteries <G>.
If you have questions about the X50E, shoot.

[helicopter1]

That is some folks opinion. I keep reading those posts also and think about what they are saying, that 120 is faster,..which is due to the front servos moving slightly less during elevator inputs,..however, if all servos are the same speed and the front ones move less, you will have interactions as they reach their intended destination sooner, so I still can't get my hands around this concept of 120 being better. I'm not convinced, and quite the contrary I think 135 is far better as you never have differential travel between the servos when inputting any of the three primary control axis. Geometrically 135 is better, matching speed of travel 135 is better, and it will also develop less hysterisis over time as the front servos no longer have a shorter "lever" than the rear one. Maybe I'm just not bright enough to realize what the difference is, but I would argue 135 with equal geometry for all movements will always be better than 120 because of the possible differential in elevator inputs unless the front servos are slowed down to the same speed as the rear one for a given travel, plus the possibility of differing amounts of hysterisis .

I see what you are saying and sounds logical but maybe the flybar unit takes care of
the hystrerisis and interactions through the build in software:dontknow

[AalFerrari]

I think the main reason for not hearing much about the new e720 is because most people are stuck on Align birds now. The e720 is simply amazing. I haven't flown it yet as I am currently waiting on my new Scorpion motor to arrive. But the quality of the hardware never ceases to impress me. As for the head, it is a 135 degree swash that can be controlled as a 140 if your electronics gear doesn't support a 140. I really doubt that you will notice much of a difference anyway. Your servos and receiver/3-axis gyro will affect the way cyclic and collective behave to the point you should be able to dial in the right "feel" just from selecting the right components.

All anyone really needs to know about the e720 is that it puts TT squarely at the head of the pack once again. Believe me, you won't find a nicer bird.

[Turbo Dave]

I Agree! This is a great heli and once people get to have a good look at it it wont take long for TT to get back to the status they once had in the heli scene..
I think the main reason for not hearing much about the new e720 is because most people are stuck on Align birds now. The e720 is simply amazing. I haven't flown it yet as I am currently waiting on my new Scorpion motor to arrive. But the quality of the hardware never ceases to impress me. As for the head, it is a 135 degree swash that can be controlled as a 140 if your electronics gear doesn't support a 140. I really doubt that you will notice much of a difference anyway. Your servos and receiver/3-axis gyro will affect the way cyclic and collective behave to the point you should be able to dial in the right "feel" just from selecting the right components.

All anyone really needs to know about the e720 is that it puts TT squarely at the head of the pack once again. Believe me, you won't find a nicer bird.

[gwright]

yes it masks them, but why have the geometry problems in the first place. kinda like saying "yeah, my tail pushrod is sticky and the pitch slider isn't smooth, and I've got a worn out ball back there so it's sloppy, but hey, the gyro takes care of that"

I see what you are saying and sounds logical but maybe the flybar unit takes care of
the hystrerisis and interactions through the build in software:dontknow

[helicopter1]

yes it masks them, but why have the geometry problems in the first place. kinda like saying "yeah, my tail pushrod is sticky and the pitch slider isn't smooth, and I've got a worn out ball back there so it's sloppy, but hey, the gyro takes care of that"

I don't have an answer to that I, can only guess.

[helicraze]

The only thing not going for it is the weight, everything else looks really good.

I wish TT would push their products more

[epc2]

What's the weight??

epc2.

[gwright]

Someone weighed Tom-Erik's at the ircha jamboree and said 9.9 lbs, but he uses rather small batteries. I'm using 12S/5000's that are kinda heavy,roughly 1 lb heavier than that at 10.9 with some of my packs and a couple ounces lighter with others. Not sure, but I think he uses the BEC in a kontronics ESC, and I use a seperate 1350 3-cell plus seperate regulator, so about 4 ounces of my extra weight is from the reciever power difference.

[epc2]

10.5 or less is not bad at all.

epc2.

[worldofmaya]

Mine has around 120g more than the Henseleit TDR I had. Taking into account the 15mm main shaft and stable head, I think it's a great way to spent a little bit additional weight. If the TDR had that too, I may wouldn't have sold it. In flight you can't feel the weight difference, things you really feel is flight characteristics...
Only complain I have is the tail push-rod. That's ridiculous... using a tail servo with 10Kg and than such a "funny" piece of metal, I've not seen that since my old Gaui Hurricane. My motor has a thicker wire than that :rotf I may mount it on the boom anyway... :thinking
-Klaus

[jrod155]

with the fbl head, is the swash opposite for + pitch?

swash down= pitch +

[OICU812]

The only thing not going for it is the weight, everything else looks really good.

I wish TT would push their products more


The TT720 is actually super light, I watched them weigh it, it was literally only grams heavier then the synergy e7 so it is actually VERY light. ONLY two things I dont like is the price and the 140 swash, otherwise I didn't mind the rappys overall.

[rotorwing cris]

Will second the previous post. Price and battery costs make it a bit iffy for me.
Am going to wait until TT release of X50E. :Bang

[worldofmaya]

with the fbl head, is the swash opposite for + pitch?
swash down= pitch +

Yes... + Pitch ==> Swash down
and it's a 135° swash with unequal distance, channel 2+3 (roll servos) have the same, back servo is shorter. My VBar settings, channel 1 back servo, servo 2 left roll servo and servo 3 right roll servo (viewing direction from behind to the nose)...
CH1: 270 distance: 72
CH2: 135 distance: 100
CH3: 45 distance: 100
swash down when positive pitch
-Klaus

[jrod155]

that's weird, are all directions reversed than? swash tilt left, heli tilt right?

and what's the point?

i don't own or plan on getting this heli, i'm just really curious

[gwright]

nothing better or worse about it,it's just different from some. Taya's head design has the mixer arms going across the head and the input is on the leading edge resulting in the swash moving down for positive pitch,.

[3D Dave]

I saw the E720 with flybarless head up close at Chicago i-Hobby. VERY nice heli. I think the diet was a great thing (had an E550).

If I wasn't buying a Logo 600SE, I'd be seriously looking at the E720.