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Futaba-RC . HeliProz . Boca Bearings
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Low Head Speed Helicopters

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Who flies low head speed?

Mike Fortin

Elite Veteran

USA

Low HS fun!

http://m.youtube.com/watch?v=lsRyVxgvKGg

Have Rotors, Will Fly!

05-16-2013 Over year old.
dahld

Key Veteran

Bakersfield, CA, USA

@ flyfish,

In order to use 5000mah 12S packs in the Logo 600SE, you'll have to add about 1.5 ounces of weight on the tail to get CG (not a big deal, as the heli is so light, it's still under 10 pounds RTF with the larger packs and tail weight). 4400-4500mah packs would probably hit the balance pretty close without adding tail weight.

But, Logo 600SE in my opinion (and I'm not the only one that thinks this), is too lightly disc loaded in the first place, swinging a 693mm disc at an average of only 9.5 pounds using smaller packs. Getting the weight of the machine up just a little bit is not necessarily a totally bad thing at all.

(-: Dave

05-16-2013 Over year old.
Santiago P

rrProfessor

South West, Ohio

mee hang(ing) low, rotor speed...

http://rc.runryder.com/helicopter/t714364p1/

bout 1000rpm is plenty fun with 8 to 12min flights

S

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

05-16-2013 Over year old.
HOMEPAGE  
James Kovach

Key Veteran

canton, oh - US

But, Logo 600SE in my opinion (and I'm not the only one that thinks this), is too lightly disc loaded in the first place, swinging a 693mm disc at an average of only 9.5 pounds using smaller packs.
Dave,

Can you elaborate why you and others feel this way?

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

05-16-2013 Over year old.
HOMEPAGE  
gwright

Veteran

Champaign Il

I'm Currently using three modes, 1180/1600/1850 with timer set to 10 minutes since I use a mix of the three modes during flight. At 1180 the entire time, it'll go 16 minutes, so 10 is a good balance with some reserve if I switch back and forth between rpms a lot.
There are many who are simply shoving half the pack size into a 2100+ setup and flying at 1100 or so and that works well, keeps everything very very light with only the single pack, but you don't have the high speed aerobatics capability if you want to flip the switch and zoom around big-sky style, so the single pack stuff isn't for me. A big advantage to the "half-pack" scenario is that the tail works better since you're lighter and the blades aren't at such a high angle of attack, so if you just take a high rpm setup and slow it down be very attentive to the tail as it may blow out unexpectedly. Since I don't like the half-pack scenario for the above reasons, I've went to 115 tailblades, and just drop the gain in the higher rpm modes.

Gary Wright
Futaba
Hacker
Thunder Tiger
Flightpower

05-18-2013 Over year old.
Santiago P

rrProfessor

South West, Ohio

But, Logo 600SE in my opinion (and I'm not the only one that thinks this), is too lightly disc loaded in the first place, swinging a 693mm disc at an average of only 9.5 pounds using smaller packs. Getting the weight of the machine up just a little bit is not necessarily a totally bad thing at all.
To each its own.

In the videos I posted, Im flying a sub 9 lbs Diabolo with 753 blades at 1000rpm.

Does it feel too light? Not at that head speed.
Stable? Yes
Fast? Absolutely, if one can managed cyclic and collective.
Smack, pop n lock? Hell no.

I can do a decent pullback with backwards rolls with 250-300 ft vertical legs with the heli at those low RPMs, 80-90mph speed passes and fairly large cuban eights. Like Gary said, one has to be smooth or the tail will blow out.

I heard many times the very light disk loadings make helicopters feel strange or not planted, IMO is a setup issue or just plain personnal preference.

Otherwise, will someone tell Nick Maxwell the casual flying he's doing with his new very light 800 size Raptor is wrong. Betcha the disk loading in his machine is lower than most of ours.

Santiago

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

05-20-2013 Over year old.
HOMEPAGE  
dahld

Key Veteran

Bakersfield, CA, USA

@ James Kovach,

As already stated, opinions vary on the subject (no right or wrong in other words), and to some extent, how you fly and and what type of style you have, will determine what you consider the "sweet spot" for disc loading.

For me it's largely a wind issue. Light weight helis with large discs get tossed around in the wind, as the disc of a super light weight heli acts like a sail.

Another example is I've talked to F3C types that will want their helis "not too light" for the precision it offers in hovering. Other competition pilots (my son for one), who must perform precision set maneuvers and music routines in windy conditions, don't like their helis ultra light weight. They are too effected by the wind.

So "to me", the Logo 600SE with a 10S 4500mah battery configuration swinging 693's (essentially a classic 700 size disc), weighing only about 9.5 pounds, is too lightly disc loaded.

Again, no right or wrong...just preference

(-: Dave

05-21-2013 Over year old.
James Kovach

Key Veteran

canton, oh - US

Dave,

Was not an issue of right or wrong. Was just curious as to why you made the statement. I had a good idea and what you posted was the reasons I had thought you would come back with. Honestly I believe it comes down to choosing the right "weapon for the fight" . This is why I have both light and heavy disc loaded helis.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

05-21-2013 Over year old.
HOMEPAGE  
Santiago P

rrProfessor

South West, Ohio

"choosing the right "weapon for the fight"

Exactly!

I prefer a heavy slug that sings the church himn "I shall not be moved" for AMA/FAI hovering,
and prefer a light helicopter with stable blades for silly fun.

that's why Dave ended his post with the wise words:

"Again, no right or wrong...just preference"

Santiago

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

05-21-2013 Over year old.
HOMEPAGE  
ZS-JAF

Veteran

Houston, TX

Great discussion. I see that I am not the only guy that like the slow head speed. It is just different. I will still be flying higher head speed on some others but I like the idea of much longer flight times for learning new things. One thing that Dave touched on that I also noticed is that flying the Logo in high winds is not fun. I does also seem that some heli's lend themselves more to low head speed.

I have a 3D heli, I don't understand why it doesn't do 3D

05-21-2013 Over year old.
DemetriusUSN

Senior Heliman

Virginia Beach, Va USA

I want to change my head speed on my Fusion 50 12s but I can't find a main gear small enough. This is my equipmt:
Align 700mx 530kv motor 6mm shaft
Hyperion HV servos,Ice2 80hv,CC Bec pro
Beastx
623 edg blades
Ar7000 rx
I want a low head speed,so what is low enough for this heli and which pinion should I use,my main hear is mod 0.8, I have the CNC gear, thanks.

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

05-21-2013 Over year old.
HOMEPAGE  
Dr.Ben

rrMaster

Richmond, VA, USA

Use a headspeed calc to rough in your gear ratio. I can run the numbers for you but I need to know the maingear tooth count. You may have to look at a lower kv motor if you intend on using an HV set up and depending on pinion options. Understand that low headspeed works better on 700 class or at least stretched 600's. It is easier for a large span, lower disk loading model to create an acceptable amount of gyroscopic stability for good feel in flight at low rpm than a small disk model can.

Ben Minor

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC

05-22-2013 Over year old.
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Low Head Speed Helicopters

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Who flies low head speed?

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