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HomeAircraftHelicopterLow Head Speed Helicopters › Low Head Speed on 3-Blades
06-23-2015 04:46 PM  3 years agoPost 21
prototype3a

rrApprentice

Christiansburg,VA

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In my experience, 8-10 minute flights are the key to progressing. You can take off and practice a few maneuvers you're already familiar with then alternate between new stuff and old stuff. For me, the new stuff gets my adrenaline going and the old stuff calms me back down.

~Drew

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06-23-2015 05:39 PM  3 years agoPost 22
mpafonseca

rrApprentice

Savannah, GA - USA

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I agree you you all. The key point on my post is that those are my conclusions based on the first 2 flights only. I really believe it will give me a little more. There is still a lot of experimentation on the way. The low head speed behavior is showing up pretty good (excepet for the tail at 1350RPM). The 3 bladed head really makes some difference but I still want to put the 2 bladed head back to compare. One important point is that my E8 is not a very light machine. It is slightly lighter that the 12S setup but still a sturdy frame. Lets keep on trying and having fun!!!

Cheers!!

Marco

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06-23-2015 06:51 PM  3 years agoPost 23
prototype3a

rrApprentice

Christiansburg,VA

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I should have mentioned before that I can highly recommend the I2RC/RC-Tek tri tail. I've run them for years and I bet it would fix any tail authority issues you have. It's just a question of if one can be fitted to your particular heli. I know they're available for TT e700, Align, Logo... etc.

~Drew

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04-25-2017 01:15 PM  15 months agoPost 24
trillian

rrVeteran

London, UK

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JR E8
Hey Marco,

I know this is an old thread now, just curious how you're getting on with the E8?

I got one last year and built it for 6s power after the success of converting my other two 600 size helis to 6s. But I was not able to run as low a headspeed as I had hoped.

For some reason the E8 just didn't seem to work properly until I got the headspeed up to about 1800. I'm using a 730MX / 850 motor on a single 4000 or 5000mah 6s pack.

I also needed longer tail blades, I have NHP 100mm tails on it now.

This works well but as it's a lot bigger and heavier than the other two 600's I have, it hits the packs pretty hard. So I will probably convert it to 12s as I have a 600mx motor rewound for about 400kv and I also have a 400kv Scorpion 4035.

Just recently I got a Forza700 Fuselage really cheap in a sale and it looks like it will fit with just minor mods and will give it a very different look.

I love the way it flies, more like a small 700.

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04-25-2017 04:32 PM  15 months agoPost 25
mpafonseca

rrApprentice

Savannah, GA - USA

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That is exactly how I feel too and one of the reasons why I like the E8. It is as "small" 700 heli and really flies like a bigger one.
I ended up stretching the tail to a 700 size using Forza tail boom and shaft. Its "plug n play" and helped with the tail power and CG at a few grams cost. I'm not a crazy 3D pilot, I like more big air F3C style flights and the JR's are really good at that. the flips, rolls, etc, are really precise. My current setup has a 650KV scorpion motor on 8S and that gives me capability to fly between 1400 and 1900RPM. So I use 1450~1500ish for hover and 1800 for maneuvering. With that combination I get 8 to 10 minutes of flight using 70 to 75% of the 4000mah packs. I'm using 105 tail blades and the stretched tail. I have plans in the future to try some 690 blades on it and see the results. It will be a full 700 size then and I may need to upsize the packs or make it a true 12S... Its flying great for me but it is for sure not as fast as a light 700 or 600 heli at 2400rpms, but that is the point of flying lower head speeds...
Cheers!!
Marco

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04-25-2017 08:51 PM  15 months agoPost 26
trillian

rrVeteran

London, UK

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Thanks Marco, That's really good to know about the Forza boom. I might look into that as well, it might allow the Forza tail part of the fuselage to fit without having to cut it.

My flying is also smooth F3C and 'big air'

It would be a pretty good weight as a 700, I would think still under 5kg with a pair of 4000mah packs. Something like 630/650mm blades might be interesting. If I stretched the tail I could try a set of the NHP 680s that I use on the Minicopter.

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04-26-2017 01:31 AM  15 months agoPost 27
mpafonseca

rrApprentice

Savannah, GA - USA

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The only issue I have with putting 700 size blades right now is that the blades we can find in the market are not designed for 3 bladed heads. They are fast/light 3d normal 2 blade sets with an extra blade. I really wish there were a properly designed narrower chord (higher aspect ratio) and higher efficiency sets. The blades available now are too draggy and do not allow maximize the 3 blade setup efficiently. 680 Blades you have are probably a closer set to that, but its hard to find this type of blade today... everything is 690/710..

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04-26-2017 02:16 AM  15 months agoPost 28
trillian

rrVeteran

London, UK

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Yeah the choice is limited in 3 blade sets.

Probably the closest I have tried to a truly optimised 3 blade set is the Helix 695s. They're also extremely light. I flew them once on the Triabolo just to try them but I still like the NHPs best. The Helix blades are amazingly crisp, you can have a crazy fast roll rate and very quick and precise stops. But I just don't need cyclics that fast. Plus, the NHPs fold back - that's another thing about three-blade sets, some won't fold back far enough in the grips and force you to remove a blade for transportation which is a hassle (it's a minor point, but still it's nice when you can just leave the blades on).

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