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Lowest head speed on a 3D flight?

es1co2bar3

Key Veteran

winnetka california

About 1400 rpm I can get a solid 9+ min. The entire drive system gets barely warm to the touch. A very relaxing way to learn new stuff without the model going zinging off in a weird direction the moment you make any mistake.
When I 1st heard of these low RPM flight I didn't believe until someone send me REX 700 using 6s 5500mah 35c: man' it was cool to watch the flights
Without the hype doing some cool 3D.

When your over smart you should nickname Sir, Google.....!!

09-24-2013 Over year old.
Richardmid1

rrProfessor

Leeds, England

Ive 3D'ed my Trex 700E on a single 6s 5000 20C at 1100-1200 rpm for 8 minutes.

The only problem is tail authority as I still only had 105 tail blades, with 115's it would be much better.

Low voltage rules! lol.

60% of the time, it works every time!

09-24-2013 Over year old.
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DemetriusUSN

Veteran

Virginia Beach, Va USA

I have a Trex 700 with stock motor, main gear and 13t pinion I just got, haven't put it in yet, it has 12t pinion. Now what would I need to change to get my head speed down low and still have good tail authority?

If you aren't crashin', you aren't flyin!! USN Ret.

09-24-2013 Over year old.
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Richardmid1

rrProfessor

Leeds, England

Now what would I need to change to get my head speed down low and still have good tail authority?
Longer tail blades.

60% of the time, it works every time!

09-24-2013 Over year old.
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red_z06

rrProfessor

Dumont, NJ

I have a Trex 700 with stock motor, main gear and 13t pinion I just got, haven't put it in yet, it has 12t pinion. Now what would I need to change to get my head speed down low and still have good tail authority?
Tail authority is RPM and tail gain dependent. Normally you have to set the gain below wag/hunt at max rpm. Since you have dropped the rpm to half you will have to increase gain to compensate for it.

If not, it will be much like flying at high rpm with very low gain.

www.JustinJee.com

09-24-2013 Over year old.
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Dr.Ben

rrMaster

Richmond, VA, USA

Stock 12S models with gearing for 12S and motor KV as well the best bet is a jumper and a single 6S pack. It keeps the controller running in about the same throttle percentage point (half the voltage, half the headspeed assuming 2000-2100 on the head @ 12S). Add the second pack when you want to run higher headspeed.

You have to be very careful taking a model set up for 2K on 12S and then restricting it down to 1200 rpm. It is REALLY hard on the FET's if you are not gentle will the collective. Some controllers will tell you to go to hell . Kontronik handles these demands especially well. This is not my brand bias; this is an engineering fact of the way their stuff is designed.

If you want a dual purpose/speed set up, gear the model for about 90% throttle at 1800-1850 (PM for suggested throttle % for Jive versus Kosmik versus CC versus Jeti), and then dial the headspeed down for your low rpm stuff.

If you want the ultimate in efficiency, you would use a much lower kv motor geared such that the model is turning at 1300 or so at about 90% throttle, but in doing so that will be your highest headspeed. The thing will probably run for 15 min of slow D.

Ben Minor

Team Futaba Team Kontronik USA
Progressive RC

09-24-2013 Over year old.
qraptor

Senior Heliman

Illinois

If this takes off, we should start seeing more options for low Kv motors. 15 min of slowD would be fun.

09-24-2013 Over year old.
Einzelganger

Veteran

Campbell, Texas USA

Slow d.

I like it.

Great info Dr.Ben.
Great videos chuck and Heli-itis™ sufferer.

Wayne

I love the smell of nitro in the morning.
RIP Roman

09-24-2013 Over year old.
Toddc72

Heliman

weed,ca-usa

Devin leblanc

Watch at YouTube

09-24-2013 Over year old.
DemetriusUSN

Veteran

Virginia Beach, Va USA

First off, great info everyone. So to be safe, its better to get a low kv motor to run a low head speed on a 90 size bird then, think I got it.

If you aren't crashin', you aren't flyin!! USN Ret.

09-24-2013 Over year old.
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Richardmid1

rrProfessor

Leeds, England

Lower kv motor or run 10s or 8s instead.

60% of the time, it works every time!

09-24-2013 Over year old.
HOMEPAGE  
DemetriusUSN

Veteran

Virginia Beach, Va USA

Well, investing in packs other than 12s I use on my Fusion 50 and Trex 700 might not be the way for me, so I will look into a lower kv motor, how does 480kv sound on 12s?

If you aren't crashin', you aren't flyin!! USN Ret.

09-24-2013 Over year old.
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Chet Whitford

Elite Veteran

somewhere else

Another of Timo Wendtland, this time flying a TDR on 6s.
One of my favorites

Watch at YouTube

09-24-2013 Over year old.
red_z06

rrProfessor

Dumont, NJ

Well, investing in packs other than 12s I use on my Fusion 50 and Trex 700 might not be the way for me, so I will look into a lower kv motor, how does 480kv sound on 12s?
While not ideal, You can use your 12s pack. Assuming it is made up of 2 6s packs, just plug one of the two packs in to ESC and plug the other connector with a jumper.

I would not invest in either a 6s pack or a lower kv motor just to test it out.

www.JustinJee.com

09-24-2013 Over year old.
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Einzelganger

Veteran

Campbell, Texas USA

Great flying Devin leblanc!
Thanks Toddc72 for posting.
...and Old Hippie, that TDR flight by Timo Wendtland is inspiring!

Wayne

I love the smell of nitro in the morning.
RIP Roman

09-25-2013 Over year old.
DemetriusUSN

Veteran

Virginia Beach, Va USA

Red z06, Got it thanks.

If you aren't crashin', you aren't flyin!! USN Ret.

09-25-2013 Over year old.
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es1co2bar3

Key Veteran

winnetka california

Love that TRD wow that's awesome: '

When your over smart you should nickname Sir, Google.....!!

09-25-2013 Over year old.
Dr.Ben

rrMaster

Richmond, VA, USA

Jumpering a 6s pack puts you right smack dab in the sweet spot for the controller assuming the typical motor and gearing combinations used stock in most 700 class models. Most these days are geared for about 2100 and will go a bit higher, so half the voltage puts you at about 1100-1200 rpm or so. You could tweak it up a little with one more tooth on the pinion or a slightly lower maingear tooth count if available. For those looking to try this stuff out, this is the way to wet your feet without buying stuff.

Demetrius, 400-450 kv and a pinion count on the lower end of things will allow you to run a low rpm set up without being excessively hard on the controller. I can help you with the gearing/set up if you choose to go this route.

Guys, properly tuned these set ups are incredibly easy on every component in your model. Servos, bearings, motors, esc's, batteries.........pretty much everything just operates as if it were cruise control and lasts a LONG time. Not for everyone, but likely good for quite a few.

Ben Minor

Team Futaba Team Kontronik USA
Progressive RC

09-25-2013 Over year old.
cgbole

Elite Veteran

Tulsa Ok. U.S.A.

Well said Ben. I run a 4035 450 Scorpion on 7S in one of my E7's.
7s because I run 14s in the other one and had 7s packs so that's what I use. I fly the 7s one more than the 14s anymore. It's just so much more relaxing and I can keep up with the heli much better. The flight times are so long all the guys at the field complain about how long I fly. Quite a difference from the short flight times guys complained about from E Helis back in the day.

Everyone owes it to themselves to try it at least once. IMO..

chuck

Synergy / Thunder Power / Esprit Model / Scorpion Power Systems

09-25-2013 Over year old.
red_z06

rrProfessor

Dumont, NJ

I believe for most, this will be a fad or novelty but not a permanent setup.

As such, I don't believe in investing anything or changing any physical setup such as motors or pinions as you will have to revert back to your normal setup.

So, you can whip it around with your normal 12 or 14s setups and take a breather with a half pack setup with only a jumper plug.

As Ben said, most 450, 600, 700 setups are near high end of RPM spectrum and reducing to 1/2 rpm seems to land on that sweat spot.

Unfortunately, for 450 you can't go half but 2/3 with a 2s pack.

www.JustinJee.com

09-25-2013 Over year old.
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Lowest head speed on a 3D flight?

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