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JR Helicopters JR Forza, Vibe and Vigor Helicopters Discussion


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Old 01-29-2016, 06:47 AM   #1
trillian
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Default E8 Leggero three blade questions

Just curious if anyone runs low headspeeds with the E8 three blade version and what headspeeds you find work well. (and what tail blades are holding well)

Also, what size packs balance easily.

The reason I ask is that I am contemplating building it as 6s but I think this would only be practical at lower headspeeds to keep the amps low ish and decent flight times. Otherwise I would go 12s.
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Old 02-05-2016, 10:42 AM   #2
devilfish
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Hi

Im using the E8 with the mb-351 head.
My HS is 1600 for slower "sport" flying.
And 1950 for some insane 3d preformance.

I went from 8s setup to 12s, I would not recomend use 6s especially with the 3 blade head. You will have trouble holding the rpm and you will se som insane AMP peaks on 6s with that large/heavy rotordisk.

The tail holds "ok", but you would like to get some 100mm tailblades at least, that will help alot.
I now upgraded to the JR 3 blade tail on my E8, and the tail is now perfect!
I use 3x 92mm blades.

The E8 is notorious for be nose heavy, especially with a 12s setup.
The 3 blade tail did help a bit what that...

I use zippy compact 6s 3300 x2 lipos.
With those lipos and the 3 blade tail, the E8 is still a tiny bit nose heavy. But I dont notice this at all in flight.

I used to glue some lead to the tail fin, to get the CG perfect, but took it of later becuase I couldent feel and diffrence
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Old 02-05-2016, 12:10 PM   #3
trillian
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Thanks devilfish,

Yeah the only way it would even remotely work on 6s is at low headspeeds. I'll probably build it as 12s and then see how it goes. I have a very good motor for a 12s setup and a few pairs of 2600 to 3300 packs.

My desire to go 6s is just due to the fact that I mainly fly 700 size helis on 12s using 4000 and 5000mah packs and it would be very convenient to be able to share packs and only use one 6s pack.

Right now I don't have a suitable motor for 6s as it would need something around 700kv for 1600 headspeed. But if I can find a motor without spending too much money what I might do is try it and run an ESC with logging to see exactly what the amp draws are.
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Old 02-05-2016, 12:31 PM   #4
devilfish
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One good thing about using 12s on a 600 size, is that you dont need any fance lipos with high c rating. Go cheap

The E8 with mb-351 head is a monster. I love how it flys.

Another note about the E8, is that it has a bit low mechanical resolution.
The push-pull system is to "blame" .
When I used beastX I hade to use shorter servoarms then what the manual recomended to get "blue light" when setting 8 degrees cyclic pitch.

Now I use JRs tags FBL system, and JRs predefined files for the E8
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Old 02-06-2016, 12:24 PM   #5
trillian
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Yeah you can definitely get loads of power on 12s with very ordinary LiPos. I have mostly Turnigy, a few Gens Ace, some Zippy Compact and a few Optipowers and they all work great.

At low headspeeds the current demand is also very low, to the point where I can actually fly my Kasama Faifa on a pair of 2600mah 25c packs! Only for about 6 minutes, but still it's pretty cool to be able to do that.

I will probably try a Total-G FBL unit on the E8 because I really like the feel of them. But in my experience they either just work straight away or sometimes they just don't suit a particular heli and you can spend ages trying to tune out a little issue. So if that happens I'll put a Spartan VX1 on it. As I already have a few spare Total-Gs I'll try that first.

The build is coming along nicely. It's a relatively complex airframe compared to some but everything fits perfectly and it is going together pretty fast (I'm not in a hurry though :-)
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Old 02-07-2016, 02:51 PM   #6
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Default Airframe nearly completed

The airframe is pretty much built now. So next step is installing servos and FBL unit etc. I am really impressed with the fit of all the parts and how well thought out it is, so many nice little details that really make it classy. This is my first JR heli and it is a really enjoyable build so far. (that blade holder didn't come with it BTW, it's an E6 one, my kit came with the two blade holder.
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