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HomeAircraftHelicopterMain Discussion › head speed for normal, idle1 and idle2
06-02-2014 07:13 PM  4 years agoPost 1
tomtek

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ga

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I am back into helicopters after twenty years. Built a t-rex 800 with the 3gx. It turned out excellent with all the help I got from this forum. Here is my question. I have the head speed for normal flight mode at 1600. I put it that low because I am in the process of relearning hovering and orientation of the helicopter before I can progress to forward flight. Is 1600 to low of a head speed? If so what would you recommend for normal, idle 1 and idle 2? Thank you.

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06-02-2014 07:28 PM  4 years agoPost 2
kamaroman540

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Maple Shade N.J

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Head speed
My buddy has flown his trekker on 7 cells at 1590 rpm and the heli did everything he told it,loops rolls piro flips -u mane it,it will fly fine at that head speed

LOGO600SX LOGO400SE

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06-02-2014 08:19 PM  4 years agoPost 3
tomtek

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OK Thank you

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06-02-2014 11:00 PM  4 years agoPost 4
jackp332

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Claremont, Nh USA

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I fly my 700size Gassers at 1600 and they do great. I am just a sport flyer though- no 3d for me.

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06-03-2014 12:24 AM  4 years agoPost 5
Slowpoke

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Dublin, OH

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tomek,

I'm flying my 800 Trekker at around 1400, and have no problems. As long as you still have enough pop to get recover from situations such as a wind gust you should be fine, especially hovering.

I have my Idle 1 set to give me an extra 100ish on the headspeed, and Idle 2 another 100 above that.

I don't do 3d, and I have all my helis setup to run the headspeed on the lower end.

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06-14-2014 02:02 AM  4 years agoPost 6
john2kx

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Augusta, Ga

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I'm not a smack flyer and run much a lower head speed on my Raptor e720 to take advantage of longer flight times. I typical get 10-12 minute flights of mild 3D at 1200HS. If I were just hovering or flying scale, I can get right at 15 minutes.

FM1 set at 1600 gets me about 7-8 minutes of mild 3D or old school FAI, and FM2 (1850) drops me down to about 3.5-4 minutes (speed runs/mild 3D)

From what I have learned, you will need a good ESC to be able to handle the low head speed (Kontronic/Jeti) to avoid high ESC temps.

You really need telemetry when pushing the flight times like this. Voltage and mah consumed are key pieces of info.

I grew up on nitro 25 years ago and was accustomed to 8-10 minute flights. If 3-4 minutes were all you could get out of a electric heli, I would have never made the switch.

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06-14-2014 02:56 AM  4 years agoPost 7
john2kx

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Augusta, Ga

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After giving your issue some more thought, I remembered how I dealt with this HS vs. flight time issue 2 years ago when new to electrics.

Prior to having telemetry, I simply used my charger after each flight to see where I stood relative to the 80% rule. Pretty easy to do if you are hovering and just practicing orientation.

Once I moved on to forward flight and started using a bit higher head speed in FM1 and FM2, I had to come up with something else. I bought a cheap $3 6S voltage monitor from Hobby King that plugged into one of the balance plugs of one of my flight batteries. It had a flashing light and a loud alarm that I could set its trigger point at (ie 3.8 volts per cell or what ever I wanted to set it at). The problem with this system is that when you start doing more aggressive flying, you will trigger the alarm when applying maximum collective pitch about half way through your flight. Better than just a timer, but no where near as accurate as live telemetry.

Hope this helps.

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06-14-2014 04:02 AM  4 years agoPost 8
turboomni

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East of the Equator

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Interesting thread ,,,flight time. I have heard of guys running a 6s on a 12s big heli and getting simular flight times of 10 minutes or so on your big electric helis. Their head speeds are rather low ,,,maybe 1200 or so but half the massive lipo weight. Big thread on hf about this. I am interested as I fly 90 sized gas helis and get 15 minute flights with ease for pennies a flight with about the same power as a 6s on a 12s system ,,maybe more with my modified engines as I run a max of 1900 headspeed on 710mm blades.

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

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06-14-2014 04:10 AM  4 years agoPost 9
turboomni

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East of the Equator

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I just recently needed a 50 sized heli as I sold my raptor 50 nitros years ago. All I had was a 450 and went to my 90 gassers. So with the electric ,,,goblin frenzy,,going on now I went with the Align 550 pro to see what was up with electric. A rather nice heli with more power than my gassers for sure. Did everything I wanted and expected more from me ,,but then the timer goes off at 6 minutes,,,,,good grief I was just getting warmed up just as I was thinking what I wanted to to do.
Nice but no run time....

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

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06-14-2014 11:05 AM  4 years agoPost 10
john2kx

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Augusta, Ga

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Turbo,

I found the same with my gaui x5. The smaller machines just don't have the performance when running really low head speeds like the 700 size and above.

While most are running the x5 at 2600 HS for about 3.5-4 minutes, I have lowered mine to 2200 and can fly for 5 1/2 minutes with good performance.

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06-15-2014 03:11 AM  4 years agoPost 11
jkurz

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Keller,TX

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Flying my 800 DFC Pro @ Normal: 1650 idle 1 : 1750 idle 2 1950 to 2000 RPM.

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06-15-2014 03:24 AM  4 years agoPost 12
turboomni

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East of the Equator

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What kind of flight times you get from a 1750 head speed jkurz??

John2kx I hear the gaui is a really nice machine....but man 3.5 to 4 minutes?? That must be for crazy 3D! 5 1/2 minutes is better for sure. How big a lipo can you stuff in that thing? I am assuming it is a 550 size,,maybe I am wrong..

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

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06-15-2014 03:32 AM  4 years agoPost 13
turboomni

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East of the Equator

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Here is a video of very low headspeed of 1000 rpms on a 700 i believe. Now I wonder if you run even 1500 on a 6 cell it would be much better. Take a look,,,,,

Watch at YouTube

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

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06-15-2014 04:14 PM  4 years agoPost 14
jkurz

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Keller,TX

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I get a good 5 min.

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06-15-2014 05:02 PM  4 years agoPost 15
john2kx

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Augusta, Ga

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[quote]
Turbo
There is more to it than running a 700 size machine designed to run on 12S than pulling one battery out and dialing in super low head speed as Matt is doing in this video. Selection of esc, motor and pinion are critical. Head speed selection is also limited. Many good posts about this subject. Look up posts by gwright...he has contributed much on this subject.

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06-16-2014 12:10 AM  4 years agoPost 16
turboomni

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East of the Equator

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There is more to it than running a 700 size machine designed to run on 12S than pulling one battery out and dialing in super low head speed as Matt is doing in this video.
I'm sure that is the case and I will do more research as you suggest especially if I decide to go down that road. With my electric helis now I get 6 solid minutes of flight which is not bad for a electric but would gladly trade some power for run time to compete with my gassers. 10 minutes even would make me happy.

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

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06-16-2014 03:35 PM  4 years agoPost 17
gwright

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Champaign Il

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rotor rpm is entirely dependant on what you want for a mix of flight time and power/performance. I recently got an 800 in the air (raptor E820) and due to the lack of low rpm motors available, I've settled on 1100/1400/1600 for the headspeeds. That's on 12S. I use telemetry to alarm me when 4000mah is used from my 5000mah packs. At 1100 it actually does really smooth 3D VERY WELL (lotsa pitch), and at 1600 GPS telemetry has recorded 106.25mph max (lots wind, so I'd discount that to low/mid 90's, which is still moving really well). Using a mix of RPMS's during flight (some high speed, some low rpm,etc.) my telemetry alarm normally goes off between 12 and 14 minutes. 1100 is my favorite, and average current in that mode normally logs to 12~13 amps doing smooth 3D with peaks of just under 30 amps and hovering current in the 8 to 10 range. That equates to 20ish minutes, and in high speed mode at 1600 it drops to 7ish minutes due to the higher current,.. (yes, 3 times the current draw for a roughly 40% increase in rpms). I don't mean to preach low rpm is the only way to go,..it isn't, and you have to decide what suits your flying style. However, turning the head just a little slower gains a lot of flight time as rpm and current draw are not a linear relationship.Just a tiny bit more rpm than you actually need can DRASTICALLY reduce flight times.

Gary Wright

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06-16-2014 04:49 PM  4 years agoPost 18
turboomni

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East of the Equator

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Great post and great flight times!! Everything is a compromise and it's just a matter of finding what suites your taste ..

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

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