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HomeAircraftHelicopterLow Head Speed Helicopters › Low Head Speed Newbie
07-24-2017 07:41 PM  16 months agoPost 1
Chrisp

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Auckland, New Zealand

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Hi
I have a Trex 700e that I would like to set up with a low head speed. However I have no idea on the set up so would appreciate advice on what I need to do. I am not a 3D flyer just general sport flying but like the idea of low head speed.

Thanks
Chrisp

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07-25-2017 07:20 AM  16 months agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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Here is a good read or place to start

https://rc.runryder.com/t792325p1/

~~Enjoying the hobby one flight at a time~~

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07-25-2017 01:30 PM  16 months agoPost 3
Santiago P

rrProfessor

South West, Ohio

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Chrisp

What is you target "low speed"?
It means something different for most people.

For Reference: I have been doing low speed for about 5yrs and for my 700, that is 850 to 950rpm with only 6S 5000ma pack.

I now fly most of the time 1250 to 1650max, and the heli is very acrobatic at ~1350 with 12S, using 713 to 720mm blades.

Santiago

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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07-25-2017 05:13 PM  16 months agoPost 4
gwright

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Champaign Il

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first off, If your rex has a dfc head, you want to change that so you don't snap a link in the air when flying lower headspeeds.
Next, need to decide if you're going 12S, 6S, or something in between. personally, I really don't like the idea of something in between, like 7s, 8s, 10s, etc, because it's a compromise, but some times it actually makes more sense because you may have a motor with a specific kv that doesn't suit 6 or 12 cells,.. or you have a lot of battery packs of a certain size,..etc. That's sort of why I went 6s on my little 600. 12 would of course been much better, but i had a lot of 6s packs the appropriate size, a motor in the right kv range for 6s (and 5s I fly on it sometimes), and had a spare talon 90 esc,.. but I digress.....

Once you decide on battery size (a little voice keeps saying 12s,..12s,...12s ), then find the smallest pinion you can for the heli, thus determining your gear ratio (always want the deepest you can get), and the last thing to do is select a motor with an appropriate kv for the headspeed you want to run. kv*3.7*cellcount/gearing will give you a number for theoretical max rpms. You want that number as close to your max desired rpms as possible, for optimal efficiency. If you're just a tiny bit under you can always raise timing in the ESC a bit, which raises the kv of the motor, but if you're over in the kv, there's going to be no way to truly optimize.

So,.. is it DFC?,.. what size packs do you want to run?, and whats your target headspeed?

Gary Wright

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07-25-2017 10:42 PM  16 months agoPost 5
PaulBowen

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Victoria, Australia.

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Great post gwright

If I'm not mistaken you recommend 12s! The only design factor that will determine my next model is cell count. Having owned electric for some years now I can honestly say that I hate charging batteries. My current electric model is 12s. If charging isn't annoying enough already then charging two packs per flight is really annoying, inefficient and expensive. To me electric was meant to be simpler, 12s doesn't cut it for me.

My next helicopter will be single pack, 6s or 7s.

Futaba T18SZ, Hirobo fanatic!

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07-25-2017 11:21 PM  16 months agoPost 6
gwright

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Champaign Il

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I understand about charging, but good charger(s) will resolve that. I use parallel boards and parallel charging cables (some call them squids). I have many chargers, buying new ones every few years as they get better but for the last 5 or 6 years it's been icharger 306's. With parallel board I can get a large 12s pack up in 20 minutes or so, and on another charger have 4 or 6 more plugged in at a lower rate. I rarely charge at home unless I'm going out at 5 or 6 in the morning.

Gary Wright

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07-25-2017 11:30 PM  16 months agoPost 7
PaulBowen

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Victoria, Australia.

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I do own a parallel board but have never used it as I have heard various views on them. I also haven't investigated how to use it either.

Maybe I should?

Futaba T18SZ, Hirobo fanatic!

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07-26-2017 12:39 AM  16 months agoPost 8
Pistol Pete

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Seffner, FL

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http://www.progressiverc.com/faq

If you have any other question not answered in link...ask away.

The only thing I dont see is that if you have a potential bad cell in one batt, those I charge separately.

~~Enjoying the hobby one flight at a time~~

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07-26-2017 12:10 PM  16 months agoPost 9
PaulBowen

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Victoria, Australia.

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Thanks I'll check it out.

Futaba T18SZ, Hirobo fanatic!

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07-26-2017 05:45 PM  16 months agoPost 10
gwright

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Champaign Il

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parallel boards
Example of parallel boards. going to field for a bit after work one day, not a lot of time to spend there, so I charged a few packs at my desk that afternoon. Three 306's in use, one with parallel boards and 7 packs of 4s,.. various capacities,.. another with 4 packs of 6s/4350's (for my 700,.. in 12s configs), and the third has my transmitter pack on it. One of these days I have to get a lipo for the tx A bit over half an hour to charge all of this. At a heli event it's normallya couple chargers full of 6s packs, but at an electric event including planks, of which I take numerous,.. I can have a dozen or more packs on each charger, with parallel boards all daisy chained.

Gary Wright

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07-26-2017 09:40 PM  16 months agoPost 11
gologo

rrKey Veteran

Sedalia, Mo USA

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Gary, gotta ask.......if any one of them were to catch fire, does
that window in the pic open easily......and quickly, or at all?

Just messin' with ya (sort of); heck of a set up!!

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07-26-2017 11:03 PM  16 months agoPost 12
PaulBowen

rrKey Veteran

Victoria, Australia.

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I plugged mine in to give it a go. The balance lead didn't work directly plugged into the charger, only plugged into the 6s plug on the existing balance leads, annoying. It's a Hyperion 720Duo.

I will give this method of charging a go though.

Futaba T18SZ, Hirobo fanatic!

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07-26-2017 11:37 PM  16 months agoPost 13
gwright

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Champaign Il

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window doesn't open, but I was sitting right there by it so it wasn't unnattended, and we have those big yellow fire extinguishers in the building that are specific for lipo fires, one of which is about 20 steps from my desk

Gary Wright

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07-26-2017 11:54 PM  16 months agoPost 14
gologo

rrKey Veteran

Sedalia, Mo USA

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Gary I wasn't being super serious about that, I know you are 'Da Man'
on this stuff

And just these questions and will quit derailing this thread, the
yellow exts just for lipo..........what are they called, chemical-wise, and available off the shelf? but probably super expensive?

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07-27-2017 12:48 AM  16 months agoPost 15
gwright

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Champaign Il

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I think it's class D,, around $400 and up

Gary Wright

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08-02-2017 04:16 PM  16 months agoPost 16
Richardmid1

rrProfessor

Leeds, England

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I have a Trex 700e that I would like to set up with a low head speed. However I have no idea on the set up so would appreciate advice on what I need to do. I am not a 3D flyer just general sport flying but like the idea of low head speed.
If you already have a bunch of 6s 5000 the simplest thing to do is to just run it on a single 6s 5000 by just removing the rear pack from your tray. If it's a castle ESC already set on governor (set rpm) mode then you don't need to do anything, it will auto detect the number of cells and try to hit whatever headspeed you set, of course on 6s it won't be able to so the throttle will just remain at 100% which is what you want for running 6s. On a stock 700e it will give you around 1150 rpm. You will get double the flight time and as you have double the flight packs since you are only running one at a time that is a lot of flying vs. charging! Also the packs will last you much, much longer due to the lower current draw.

60% of the time, it works every time!

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12-29-2017 07:00 PM  11 months agoPost 17
Chrisp

rrNovice

Auckland, New Zealand

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Hi
Finally got around to flying with a single 6s 5800. I have a Platinum 120A ESC and EBAR FBL unit. The heli lifted off and there was a severe side to side wobble, managed to get it down with no damage. The heli is a stock Trex 700e with no changes other than running a single 6s as opposed to two.

Any help on what the cause of the wobble was and how to fix it would be much appreciated.

Thanks
Chrisp

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12-29-2017 09:39 PM  11 months agoPost 18
Flyin for Jesus

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Troy, IL. 62294

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What HS were you running?

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12-29-2017 11:42 PM  11 months agoPost 19
gwright

rrVeteran

Champaign Il

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dfc or not?

sounds like damping is too stiff, but unfortunately it has to be stiff if dfc or you risk a mechanical failure

Gary Wright

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01-03-2018 01:01 PM  11 months agoPost 20
Richardmid1

rrProfessor

Leeds, England

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We need to know what 700E you have, is it flybarred or FBL?

Did you remember to ditch the governor and run 100% throttle?

Were your blades too tight maybe, causing them to not center properly at the lower centrifugal forces?

60% of the time, it works every time!

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