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Home✈️Aircraft🚁Helicoptere-JR-HeliOther › NEX E8 three blade headspeeds / LiPo sizes
01-30-2016 11:51 AM  3 years ago
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trillian

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London, UK

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NEX E8 three blade headspeeds / LiPo sizes
I am getting an NEX E8 special edition three blade kit, my first JR.

Just curious how well the three blade version is working at lower headspeeds? What sort of speeds are you running and how well does the tail hold at low headspeeds?

Also, what size packs balance easily?

I will be looking at a few possibilities: 1. Leaving it 600 size and running 6s, but this is most likely only viable if it works well at lowish headspeeds otherwise flight times would be too short.

2. Stretching to a bit bigger and running 680s and going 12s (but still fairly low headspeeds)
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01-31-2016 03:08 AM  3 years ago
mpafonseca

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Savannah, GA - USA

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I have been flying my E8 with the MB351 and JR original blades in a low head speed configuration. I use a 510kv motor that gives me 1700 rpm max with 8s 4500 batteries. In this config I fly a mix of rpms between 1400 and 1700. At 1600 to 1700 the tail is very reasonable and the cyclic response is very good. I do not fly hard 3d so for me if is enough. If you like to stick bang it may miss a little for you. I use 1400 to 1500 for hover and it is very stable but on the lower 1400 side the tail lacks some power on pitch punches. I use 105 tail blades. Overall I like the way it flies but I'm sure some 3d pilots would not like it. It all depends on your expectations. On the good side I can fly for 10 min in this mixed rpm modes using about 3800 to 3900 mah from the batteries. With the 4500 40c packs I use it is very slightly nose heavy. I talked with some guys at JR in Japan when I was building it and they suggested 1700rpm for the 3 bladed e8 as a starting point too.
I really like the JR quality and the helis "style" of flight. It really matches my taste. I think you will like it too.

Cheers

Marco
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01-31-2016 10:26 AM  3 years ago
trillian

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London, UK

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Hi Marco,

Thanks very much for your reply. It seems not very many of this model are out there as I never hear anything about them now.

My flying is F3C (ish) and 'big air', in any case it's all smooth stuff, no smack 3D.

The ideal situation would be if it could run on a single 4000-5000mah 6s pack because I could then share packs with my 700 size helis. Alternatively I'd go 12s with 4000mah packs but it might be a little on the heavy side I think. I do have a suitable motor for 12s, it's a 600mx rewound with single strand for 420kv. For 6s it would need something around 700kv.

Did you have to stretch the tail to run 105s?
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02-01-2016 02:40 AM  3 years ago
mpafonseca

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Savannah, GA - USA

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My current setup has the standard tail and the 105 blades are fine. I have been thinking on stretching it to 700 since my current motor is a 700mx. The 12s setup with 3300mah is already slightly nose heavier than the 8s4500 but if you stretch the tail it may be OK for 4000 mah. The slight nose heavy setup is good for F3C style (I fly that way too). It is a very smooth and precised machine. It does not feel "light" as some other smack 3d helis but I like it.... It flies like a bigger heli.
700 to 730kv will work on 6s but you may miss a little punch but for smooth flight its OK!
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02-01-2016 08:27 AM  3 years ago
PaulBowen

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Australia

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I have been flying one with the MB351 head and JR blades and 105's on the tail for 3 years.

Kontronik Pyro 700-45
Kontronik Jive 80HV
JR DS8717 x3
JR MPH83GWV tail
Mikado VBar
12s (6s3300 x 2)

It is the best flying helicopter I have ever owned. I fly for 8 minutes. Not sure the rpm.
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02-01-2016 09:37 AM  3 years ago
trillian

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London, UK

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Thanks very much for your replies. I am expecting my kit to arrive today, sitting here listening for the door so I don't miss the elusive UPS guy.

I have a 630KV motor but I think it may be a bit too low for 6s. Mr Mel's calculator shows about 1450 headspeed at the Jive governor sweet spot.

I think what I'll do is build it and play around with LiPo placement to see if it can balance properly on a single 5000mah or 4000mah pack and if so then try going 6s. I'll also see what the total weight will be if I went 12s with 4000mah packs. It's important to be able to share with my bigger helis because the whole charging and LiPo management thing has to be kept to a minimum.

Based on the LiPos I have, two 3300s weighs about 1060 grams. A single 5000 weighs 830grams. Most of my 4000mah packs weigh about 650 grams and the Zippy compacts weigh about 560.

I'll be using a Jive 80HV if I go 12s and I do have a 120 I can use for 6s. So the electrics will be pretty minimal, just the addition of an Ultraguard or something as a backup.
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02-01-2016 01:17 PM  3 years ago
trillian

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London, UK

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Just arrived
It's here! I'm busy with work so only got a moment to briefly look at the parts bags and rotorhead. Everything looks really nice!

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