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› Head speed question??
10-22-2014 11:35 AM  4 years agoPost 1
DemetriusUSN

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Virginia Beach, Va USA

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I have a Compass 7hv, with Outrage servos, quantum 4035-500kv, Ice120hv2 and ar7200bx. I really like big air and I want to fly that more than 3d. What is a good headspeed for that? Do I keep it at what's it now, around 2100 rpm untached, or should I lower it some. Just a question, thanks in advance for the help.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-22-2014 12:55 PM  4 years agoPost 2
Pistol Pete

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Seffner, FL

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For 700mm blades, 1800rpm is a great head speed to do "anything".

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

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10-22-2014 02:04 PM  4 years agoPost 3
DemetriusUSN

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Virginia Beach, Va USA

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Pistol Pete, thanks I will adjust my headspeed.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-22-2014 02:35 PM  4 years agoPost 4
Eury

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Dover NH

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Experiment and get some pinions to see what feels good. My 7hv was very happy at 1700 for big air and sport flying and would fly for 9 minutes depending on what I was doing. You might demand more or less power from yours, but you'll never know without experimenting. I can tell you that 2100 is excessive and just killing your flight times and is hard on your equipment.

Nick Crego

Citizen #0168

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10-22-2014 02:59 PM  4 years agoPost 5
rexxigpilot

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Florida

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Find the lowest head speed that suits your performance needs for big air style. This will give the most flight time, which obviously can improve your flying skills.

2100 is way too high for big air. IMO, it is even too much for 3D on the Compass 7HV which is a light weight machine. You're just wasting flight time at 2100.

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10-22-2014 04:07 PM  4 years agoPost 6
DemetriusUSN

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Virginia Beach, Va USA

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I'll post my pinion size, I can't remember it. But thanks to everyone for knowledge. I'm constantly learning.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-22-2014 10:49 PM  4 years agoPost 7
turboomni

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East of the Equator

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I run 1400 head speed on my 6 cell 700E and love it. I run 1600 to 1800 on my gassers and like that too. Check out the Low Head Speed section and look at a few vids I posted there,,,not me though!

Setup is everything, All my heli's can fly far better than I can pilot them

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10-23-2014 01:12 AM  4 years agoPost 8
Santiago P

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South West, Ohio

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Find the lowest head speed that suits your performance needs for big air style.
Agree

This is a very individual preference.
Personaly, I like 1600RPM for slow 3D including rolling circles and agreesive funnels, and big air with 1400 to 1700RPM.

The heavier the heli, the more RPM you need to manuever.

The BeastX gyros like light agile blades like Radix flybar blades or FBL V2s. Cyclone or Helix will work well too.

You will need the biggest tail blades possible for manuevers requiring good tail control when running the indicated head speeds.

ALSO, make sure you are geared properly to run these head speeds and still be 75% or higher on the ESC, otherwise, it'll overworked and possibly smoke the ESC

S

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

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10-23-2014 01:15 AM  4 years agoPost 9
DemetriusUSN

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Virginia Beach, Va USA

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Everyone thank you for the valuable advice, thanks.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-23-2014 03:15 AM  4 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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Read Chago's last sentence several times. He's a miniature man but offers sound advice. Set your headspeed first, then gear around it for best balance of efficiency and power. Desired percentages vary a bit with esc mfg and even between esc's of the same mfg, so you need to be very specific when asking further set up questions.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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10-23-2014 07:01 AM  4 years agoPost 11
Santiago P

rrProfessor

South West, Ohio

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Dear Dr.
You must be eating a very poor diet, every post following mine seem to be... short
And as I recall, you were a miniature fella many more years than I ever was.

Dumb jokes aside, the strong recomendation for proper gearing is focused on the OP's CC120 esc.
ESCs like the Kontys Jives and Kosmiks can operate safely as low as 35% in governing modes, but they are different animals.
Generally speaking, always gear for a max useful RPM using an 80-90% ESC setting for best results.

S

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

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10-23-2014 07:17 AM  4 years agoPost 12
Funky Trex

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Westerville, OH - USA

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I have seen mutiple 700s fly very differently based on many factors besides headspeed alone. The same 2 airframes could run the same headspeed but with different blades, motors, gov vs non-gov, AUW, servo choice, lipo choice, pitch range, etc, that will cause them to fly extremely different. I have had a few identical airframes flying different components and they were very different helis in the air. Headspeed is a simple thing to change. Do plenty of experimenting, monitor temps, mah used (watts and amps if you have a logger) and see what works best for your setup. For 3d flying from an average pilot, I have seen most 700s do pretty well from 1850 to 2200 depending on the pilot. There are plenty more 700s flying outside of this rpm range doing very well too so it takes some experimenting with your specific setup to get the most from your heli and personal flying style.

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10-23-2014 02:34 PM  4 years agoPost 13
turboomni

rrProfessor

East of the Equator

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I wouldn't for example try to run the heli at 1400 head speed that is geared for 2000+ to just try a head speed. The gear ratio puts the motor and esc at a disadvantage. Gearing it correctly for the 1400 head speed will make it fly very differently [and better]than with the higher headspeed gear ratio at 1400 head speed. This gives the motor a mechanical advantage. I would get a few different pinions ,gears what ever is available for your bird to try. You can punch numbers in on a head speed calculator like Mr Mels to find out what you have.

Setup is everything, All my heli's can fly far better than I can pilot them

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10-23-2014 03:44 PM  4 years agoPost 14
DemetriusUSN

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Virginia Beach, Va USA

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Okay here are the numbers:
127 slant gear, 10 tooth pinion
Gov. Mode- headspeed. ..1101,1495,1573

127 slant gear, 9 tooth pinion
Gov. Mode- headspeed. ..991,1345,1416

These numbers are on 12s packs.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-23-2014 04:20 PM  4 years agoPost 15
Pistol Pete

rrProfessor

Seffner, FL

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Using CC software...

Your last numbers for each pinion would be at 100%, so no governor there.

Your middle numbers for both pinions fall in the 95% governed. So those would be your highest "governed" RPMs.

Seems like an 11T Pn would be the best option (if available) giving you a 1300 to 1640rpm range. Of course, mainly depending on how low you want to go.

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

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10-23-2014 04:30 PM  4 years agoPost 16
DemetriusUSN

rrVeteran

Virginia Beach, Va USA

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127 slant gear, 11 tooth pinion
Gov. Mode. ..1211, 1643, 1730
And Im using Mr . Mel's Headspeed Cal. So it seems the 11 tooth pinion is where I want to or the 10. Thanks a lot...

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770

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10-23-2014 04:43 PM  4 years agoPost 17
Santiago P

rrProfessor

South West, Ohio

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11t according to Mr Mel.

Is 1211rpm ok with your castle, no warning of being too low?

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

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10-23-2014 05:41 PM  4 years agoPost 18
rexxigpilot

rrProfessor

Florida

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Castles will work fine at 70%

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