Thinking about the E820

[Guest]

I was tempted to sell mine after 70 trouble free flights and realised big mistake. Made a few of those. Anyway bought another and undergoing a N conversion with a YS120SRX!

Bavers get err flown ;-)

MJ

[Bavers777]

Quick update, maidened the e820 with coolice yesterday without any issues. Set tail gains and got a really nice smooth machine straight away. The final wiring and setup by coolice is very nice indeed and I have a very loud new canopy for it which was fitted this evening (thanks maj). I'll do a more thorough update and attach some pics shortly. I am going to fly tomorrow if the weather is ok so I'll be able to give a better review after that. Super smooth machine... SWeeet...

[Bavers777]

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Well here's some pictures of the e820 out on it's first proper outing up the road from me. The canopy that MAJ sent is pretty sick i have to say. Had two flights earlier just taking it steady but I got 8.5 minutes with 33% still left in the packs so it's very efficient just ran 1400 and 1550rpm during those flights but they were very gentle. Got two more pairs of packs charged and ready to go very shortly after I've done a bit more work........ What a beauty lol
p.s the coolice charge case I just picked up is also making my life super easy - pictures to follow.....

[George J]

Ok, so here's mine, running it on 12s, 111t main gear, 12t pinion, 160amp Kosmik, Savox HV servos, vBar Silverline. Maiden flights were very eventful with the Kosmik shutting down on two flights and having to auto down, 2nd shutdown had no option but to land in long grass which resulted in broken auto gear, tail drive gear and tail blades so that stopped play for a couple of days. So got the bits and got it put back together but needed to get to the bottom of the Kosmik shutdowns so pulled the logs. Turned out to be an issue with the motor which was causing massive amp peaks and causing the Kosmik to shutdown, so have robbed the Xera 4530-500 from my TDR to put into the E820 as it's a very powerful motor so ideal. (Will get another X-Nova, new Xera branding, for the TDR)
Back up to the field this morning to test the Xera and had 3 trouble free and as should be flights. Running around 1850hs, Align 780mm mains and Align 115 tails and getting just under 5 mins on 4400 packs but have some HV 5500's coming from Revolectrix so should end up around 5 1/2 mins so will be well pleased with that on a 800 size heli on 12s.
The heli has plenty of power on 12s on this set up so won't be making it 14s as don't feel it's needed, would gain a bit of flight time but need to be able to share packs with my other electrics. Loving the presence in the air of such a large disc and it's just a complete joy to chuck such a large heli around but have to say that it covers a bloody lot of sky if you don't keep it in check!

Another neat idea, thanks Maj, is to lengthen the power cables so that you can mount the Kosmik up front but still connect the flight packs without removing the canopy, works really well.

Would like to thanks Ben Varley for his help in trying to sort the Kosmik shutdowns but turned out to be component failure in the end anyway. Would also add that it is a good job it was a Kosmik on the heli and not a Castle/Hobbywing etc etc as with 460amp peaks that we saw in the logs they would for sure have gone up in the dreaded black smoke so you pay more but could save you in the long run, at least the Kontronik does what's it's meant to by shutting down instead of blowing up!

[Guest]

Managed to see this flown in anger today and what is striking with these machines is the minimal noise they make yet properly been thrown around. Makes the barking blades more pronounced and it certainly was shifting. Only tweak now is we think the tail is slightly underpowered on 115's during some demanding moves so 120's on next. Nice to see a few TT at the field today.

Nice machine G.

MJ

[woodsta888]

@ jonesheli

Nice build - that 500KV motor give you low enough headspeed for that setup?

I used Mr Mels headspeed calc for mine and either you running a v high headspeed or mine is very low.

I can run mine (I think) at 1700 rpm and get 9 mins and still got 3.8V in the cells.

@ Maj
When you say flown in anger and you saw it - this mean you not flying it or you sold the 820 Nitro already?

Have to agree that when max pitch applied my tail really does work at maximum and moves slightly so I reckon 120mm could have better authority. 115mm plenty for my ability though (low)

NBavers how you getting on?

Just passed the 50 flights mark on mine. Mostly 12 min flights and now moved upto 1700rpm and 9min flights.

[Guest]

G's setup on the Kosmik with 12t puts his range about 1700-1900 with reasonable throttle percentages. no I mean watching G's E flown in anger.

The only place you will find my N820 is down the field. Put 30 flights on it Friday to Monday with 8 minute flights.

MJ

[George J]

Head speed wise I have 1750, 1800 and probably 1900. I fly it at 1800 which is 70% in the TX which is about right for how I want to fly it, Kosmik likes 80% TC so pretty close really with the 500kv motor.

I reckon on the new 5500 packs that i've just got i'll get 6 mins @ 1800 maybe a bit more but i'm happy with that really. Extra minute at least on 14s though.

Tail blade wise the 820 NEEDS 120's to have full control on the limit. I could get mine to step out by 90* doing fast inverted tail down pie dish's. Only just put 120's back on but so far the results are good. On the flip side of that if you're sport flying etc 115's will be fine it's only when pushing the machine hard you'll notice the difference.

[woodsta888]

If you saw me fly you'd definately agree that I'm no where near pushing it hard. I'm no 3D pilot.

I see with the 70% on the Kosmik. Makes sense now for Headspeed.

Also on mine I set the gov with only 4.0V in the packs.

Now I saw mentioned that the E720 and E820 are to be discontinued or at least the G4 designs will be. Would you guys go for a G5 if they make one or is the G4 version enough?

Maj - 4hrs flying over 4 days!! Good going.

[George J]

Having only recently been converted to TT I can say 100% that I would buy whatever they bring out as the E700 and 820 that I now fly are 2 of the best models i've owned.

[woodsta888]

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Some pics of mine (hope I've done this correctly) sporting stock canopy and one of Maj's Fusunos. I haven't added any of my electrics otherwise I'll hear the screams of "MY EYES!" judging by the neatness of others wiring so I'll post some when I have tidied up.

Spec:
Motor: KDE Direct 700XF 395 kv
Servos: Align 615 cyclics and 655 tail
ESC: YEP 180A
Blades: Align 800mm mains, 115mm tails
FBL: Bavarian Demon 3SX - 2 x DSM2 sat receivers
Energy: 12s from 2 x 6S Turnigy 5.0 blues for motor and 6.6v LiFe for electronics.
TX: Spektrum DX8

[woodsta888]

Issues today,

Went for fly first thing and YEP had the 5 beep warning. Receiver issue. Got the prog card out, and changed some settings anyway. I went form 6 to 12 degrees timing and heli medium start from slowand it workes without warning now. The motor is also cooler om 12 timing. So much so, I fly 1700 RPM and I can keep my hand on the motor lid. (KDE700XF-395)

Whilst I had it back on the bench I spooled it up without the blades. Sounded OK BUT, if I tap my tail boom I get a rattle. Like one of the bearings you glue in is loose.

If the bearing is loose and it works its way to one end, the centre of the direct drive tube will ocillate within the tail boom if the central bearing has moved? This maybe not the case. I doubt my CA tail tube drive bearing.

Any tips or similar experiences?

[George J]

Are you sure it's not the tail push rod loose in the guides when you tap the boom? Mine is loose and 'rattles' in the guides at certain rpm on the head so to cure this I just moved a couple of the guides so the pushrod is not quite quite in line when you look down the boom.
The TT support bearings in the boom, even if the bearing had come unstuck, I very much doubt the plastic support would move as it's a pretty snug fit when you push the TT into the boom which is the main reason for glueing the bearing, to enable the TT to be installed without the bearings moving out of position.

[woodsta888]

Cheers jonesheli, hadn't thought about that. I'll try that out on the early am flights

[George J]

Well my E820 trial didn't go to my liking and although I loved flying the electric 820 I just couldn't put up with such rubbish flight time so decided I had to have another nitro so just converted my E820 to a nitro 820. Got a YS120SRX providing power so should be good.