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HomeAircraftHelicopterHelicopter Main Discussion › running 6S in a 12S machine
03-20-2017 08:44 PM  20 months agoPost 61
EEngineer

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TX

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Exactly....baseball....the story of Livan and Orlando("El Duque" Hernandez.

Castro kicked 'em out of Cuba...and they ended up in the World Series...Livan for the Marlins and El Duque for those Yankees.

Livan almost didn't make it....as he found there wasn't even one "fast food" chain he didn't like....lol

Aroldis Chapman....snuck from Cuba and is a World Champion Chicago Cub, whose name is etched in BB history.

Heck if all the ex-Cuban baseball players band together, they could buy Cuba and then kick the Castros out. One they'll have to roll out.

Logo 600SXs, 800XX, TDR IIs

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04-03-2017 06:36 PM  19 months agoPost 62
old nitroman

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Naples florida

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I tried with my e5s put 6s in flew, loops rolls inverted head speed about 1100, feels like a scale ship but you can do aerobatics, about 7 m. on a 4400 pack. pretty cool just be easy with the pitch. MY e5s is 626 blades and I do have the sped up tail.

E5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx

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04-03-2017 07:08 PM  19 months agoPost 63
heliraptor10

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kokomo, in-US

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I can verify that rev mix is right.

Lower head speed means more tail effectiveness.

Got my Goblin down to 4rpm on the main blades and my tail is rock solid.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-03-2017 10:55 PM  19 months agoPost 64
EEngineer

rrProfessor

TX

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LMAO

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04-03-2017 11:31 PM  19 months agoPost 65
heliraptor10

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kokomo, in-US

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Of course it doesn't leave the ground...

But that tail though...

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-04-2017 01:14 AM  19 months agoPost 66
JuanRodriguez

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The Villages, Florida

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Whew !! For a moment I thought you were on the same drugs as Gearhead and WC Wickedclown !!!

Been there, done that and old enough to know better.....

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04-04-2017 04:38 AM  19 months agoPost 67
EEngineer

rrProfessor

TX

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or revmix...

Logo 600SXs, 800XX, TDR IIs

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04-04-2017 04:49 AM  19 months agoPost 68
joshreynolds777

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Willis, Tx

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LOL

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04-08-2017 10:49 PM  19 months agoPost 69
Andy from Sandy

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Bedfordshire, UK

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Watch at YouTube

I don't know what happened to the light.

A fellow club member today at the field.

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04-09-2017 12:13 AM  19 months agoPost 70
Heli_Splatter

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USA

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I set my blade rotation speed to 3rpm. It is just about right for slicing watermelon.

I need to fill my LE dings with CA and catnip though.

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04-09-2017 02:12 AM  19 months agoPost 71
joshreynolds777

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Willis, Tx

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catnip lol

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04-09-2017 02:12 AM  19 months agoPost 72
Chuck Bole

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Tulsa Ok. U.S.A.

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Nice flight..

Team Synergy Field Representative / Scorpion / Thunder Power

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04-15-2017 12:26 PM  19 months agoPost 73
gwright

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Champaign Il

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I know this thread was started for 6s on 12s machine, but a 12s low headspeed setup can work well also. this is my e5 stretched, 696/116 blades
and 5.45 tail ratio on 12s/4350mah. I like the higher voltage setup to get efficiency from the power system, and of course with the higher voltage you actually can get a lot more usable power if/when needed. 17 minutes to use 3600mah. peak current 51 amps. Just over 200mah used per minute. Yes I should go to smaller batteries, but that would create a CG issue. Not great flying, but it was very windy. It's set to 1150 on governer, but I haven't synced my tx to cgy750 so it's a bit under that.

Watch at YouTube

Gary Wright

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04-16-2017 03:03 AM  19 months agoPost 74
joshreynolds777

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Willis, Tx

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Wow !!
17 minutes that's insane !!!
I love it !

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04-16-2017 05:29 AM  19 months agoPost 75
heliraptor10

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kokomo, in-US

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So if you are running much higher voltage than necessary you can run a really low rpm without a heat penalty?

I was of the understanding that you needed to change pinions for big rpm changes otherwise there's a lot of inefficiency.

I'd love to have an 8 minute bird again.
Even if it were slow. But I don't want to do anything physical to my heli to do that.

I like fast too much.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-16-2017 11:11 AM  19 months agoPost 76
joshreynolds777

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Willis, Tx

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shouldn't we be able to get 8 minutes super easy?
a simple 6S in a 12S set up?

Im getting 7.5 minutes in that 770 on 12s just on a straight linear throttle curve, no idle up. 5500mah's. Cells are at 3.7-3.8v afterward.

I haven't timed a 6S pack yet.

but seems like that would be well over the 8 min mark

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04-16-2017 11:26 AM  19 months agoPost 77
gwright

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Champaign Il

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"So if you are running much higher voltage than necessary you can run a really low rpm without a heat penalty?"

Yes, but that's only part of the story. In order to run the higher voltage/lower current to get your power, you need one of two things. Either you use an ESC with active freewheeling so it can run the low throttle percentages without melting, or you use a much lower kv motor and/or really deep gearing. I use a very low kv motor (hacker turnado, but rewound for 350kv instead of the 400kv that is the lowest available), and the deepest gearing possible for the helicopter I'm flying. This means less peak power (not needed anyway), but far more efficient at the low rpm and lower power levels. If you just use an esc with active freewheeling, then you keep the esc from getting too hot, and the lower power levels at low current keep the motor from getting hot, but the system isn't as efficient due to the higher current surges under load with the high kv motor, and you add in the excess power needed just to spin the high kv motor (higher iO). everyone looks at the kv but doesn't consider the other items such as the io. At high power levels, the io isn't very important, but at lower levels it is. For example, I average about 7 to 8 amps, with peaks of 50 to 60 amps (which still results in over 3hp by the way). However, the io of the motor I'm using is very low, an amp or so. An amp out of 8 average is roughly 12.5% of my energy usage just to spin the motor, before it does any work. Say you use a "big block" high kv motor with an io of say 4 amps (exagerating to make a point), then at the lower power levels I fly, you'd need to average 10 amps to get the same flight performance(4 wasted to turn the motor instead of 1. Over a third of the power would be wasted just be used to turn the motor so flights would be much shorter. The downside of my setup , if you want to call it that, is the peak rpms available are lower. it tops out at just over 1450 rpms (I have another flight mode for that, I just didn't use it in the above video). super High rpm isn't possible, but I don't want it anyway, so the setup is far far more efficient at the power levels I want. Motor and esc land in the 90 to 100 degree range (Fahrenheit), as measured after the flight shown above. ambient was 82f. It's "appropriate power" for the way I want to fly, and extremely efficient. It won't, however, go super high rpms, so if that's your thing, it's not something you'd like. different strokes for different folks, as they say, If you want the high rpm setup bbut want to play low rpm occassionally, then stick 6s in it like the topic this thread is really about. Not very efficient at the low rpms, but you're not doing that all the time the way I like, so it's more appropriate for what you want.

Gary Wright

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04-17-2017 04:34 AM  19 months agoPost 78
heliraptor10

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kokomo, in-US

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My application is a Oxy 3 extended 285mm blades.
It's got the stuff for 6s,
Xnova motor and hobbywing 50amp v3
I'm running 4s and 11t pinion

But as I'm running a governor then I'd be better off running 6s?
And then I could change between really fast and really slow headspeed with little inefficiency penalty?

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-17-2017 02:47 PM  19 months agoPost 79
gwright

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Champaign Il

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Actually, that's not the whole story. If you have a motor and gearing for your "normal headspeed on 6S, then just lowering the throttle (governer) to a much lower setting will likely overheat your esc, possibly causing it to shutdown, or worse, damaging it (although it would probably just shutdown from overheating before any real damage occurred). If the ESC has active freewheeling (kontroniks, YEP, hobbywing v4), then you may be OK doing that,..i.e. not have anything fail, but it's going to be highly innefficient due to the excessive overhead. it would be like driving 10mph down the street in 5th gear. With an active freewheeling ESC, then you can generally do it without an overheating or failure situation, you're just flying a system that's highly innefficient at the lower rpm. If you're after efficiency, you want as little overhead as possible. Current peaks will be much lower. looking back at your post, you have a 6s setup you're flying on 4S. That's a good start, although a much lower kv motor on 6s would be a bit better. I'd suggest starting with the throttle in the 80%~100% and check ESC temps after a flight. If it's not too hot (say 160f or below), then drop rpms 10% or so on throttle. Temp it again after a flight. The temp will probably be higher. If not,.. then go a little lower on throttle. Check temp again. Doing this you can find the point where the esc started getting too hot, add a few percent throttle, and that's your lowest "good rpm" to fly.

Gary Wright

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HomeAircraftHelicopterHelicopter Main Discussion › running 6S in a 12S machine
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