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05-16-2016 05:47 PM  19 months agoPost 121
adh1000

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coral springs,florida.usa

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sold , I like the higher headspeed definitely more crisp , flight times are a little lower but I'm using an e-fuel gauge so that's ok too
Anthony

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05-17-2016 02:13 PM  19 months agoPost 122
adh1000

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coral springs,florida.usa

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new/old problem , being the constant fiddler that I am , I decided to try and go back to the cgy gov on my x3 now that I have the gearing sorted out, setup was easy , everything checks out , headspeed is where I want it but the tail kick is back , I've tried going up and down with the gov gain (I'm around 5% now ) but the tail doesn't feel good, so my question is , is the gov very tricky to setup on smaller heli's , have there been issues with it and should I go back to the hobbywing gov , which seems to work well enough?
Anthony

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05-18-2016 11:35 PM  19 months agoPost 123
adh1000

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coral springs,florida.usa

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I want to ask a hypothetical question , what would happen if I thought I was using a 12t pinion but really I was using an 11t and put in information for the 12t?
Anthony

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05-19-2016 04:23 AM  19 months agoPost 124
Dr.Ben

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Richmond, VA, USA

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The head won't turn at programmed head speed because the gear ratio you set would have been wrong.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-19-2016 02:03 PM  19 months agoPost 125
adh1000

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coral springs,florida.usa

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I'm confused. mr mels headspeed calculator , for my setup( x3,1580kv motor, 131 main gear , 11tooth pinion, 6s) gives me a headspeed range of 2589 to 2770 , 2589 being the optimum, my actual headspeed is in the 2900 to 3000 range , what am I doing wrong? this is whats been giving me a headache for a while, I have been trying to get to 2800 headspeed with my 280mm blades but with the cgy gov I get the tail kick at that rpm , goes away at 2900, and the hobbywing gov was best over 3000, could it be possible that the motor I have is badged as a 1580 kv motor but is actually their 1800 kv motor? how would I tell?
Anthony

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05-20-2016 05:39 PM  19 months agoPost 126
Dr.Ben

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Richmond, VA, USA

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To see if the kv is about roughly correct, you'd run a straight throttle curve, tach the head at 100% throttle, then use your gear ratio to determine the motor rpm. It'll be close enough to tell if your motor kv is correct. Remember that motor KV can vary by as much as 10% from rated depending on mfg.

Ben Minor

PS: You can also tach the tail rotor with a model airplane propeller tach with no main blades on the model and calculate motor rpm, but you must have someone hold the boom firmly for safety; don't do this on the workbench.

Team Synergy Team Futaba Team Kontronik USA
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05-20-2016 11:43 PM  19 months agoPost 127
adh1000

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coral springs,florida.usa

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heres what I have, pinion 11t, main gear 131t, headspeed with flat 100% curve 3134 in the beginning getting slower as time goes on(obviously) fully charged 6s battery ,
what do I have to do to work out the kv?
Anthony

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05-21-2016 12:31 AM  19 months agoPost 128
adh1000

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coral springs,florida.usa

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found an equation on line , (kv x battery voltage/(maingear/pinion))x.8(motor efficiency) . so if I do the 1580 kv motor I get (1580x25.2/(131/11))x.8 = 2706 rpm. with the 1800 kv motor I get (1800 x25.5/(131/11))x .8 = 3046 rpm . my rpm is 3134 which if the motor efficiency is better than 80% would seem to be right , so it looks like my motor kv is wrong , am I correct and if so what do I do , I think I got the motor from heli direct
Anthony

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05-21-2016 02:07 AM  19 months agoPost 129
adh1000

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coral springs,florida.usa

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got the motor from rotary wing rc
Anthony

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05-22-2016 03:57 AM  19 months agoPost 130
Dr.Ben

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Richmond, VA, USA

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That 80 % efficiency quotient may be a little harsh with today's motors. If you factor that out, the calculated motor kv is within the ballpark of its rating.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-22-2016 02:16 PM  19 months agoPost 131
adh1000

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coral springs,florida.usa

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so why can't I run the 2800 headspeed that I want to , according to mr mel I should be in the 2500-2700 range and i'm in the 2900 to 3000 range , when I try 2800 I get a lot of bogging and my batteries,esc and motor are very warm(hot) at 2900 the batteries are luke warm and the esc and motor a little warm but not hot?
Anthony

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05-22-2016 04:59 PM  19 months agoPost 132
Dr.Ben

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Richmond, VA, USA

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With only a 100 rpm difference I don't know. There are more variables going on with your models than I can neatly debug via computer.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-21-2016 02:11 PM  15 months agoPost 133
adh1000

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coral springs,florida.usa

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I have another question , its for the x3 , I changed the blades from 380mm to 360mm because I felt that there was too much torque reaction with the bigger blades and it feels better at 3000 rpm with the new blades , I also went down with the tail blade from 78mm to 72 mm(stock) , I have the rudder piro rate at 500 rpm's but it doesn't feel like its getting to that speed it feels a little sluggish , is there a way to check the rotational speed like there is with the elevator and aileron , and as I already have the speed up pulley do I need to go back to the 78mm blades?
Anthony

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09-22-2016 02:58 AM  15 months agoPost 134
Dr.Ben

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Richmond, VA, USA

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It's 500d/s, not rpm, and unlike the cyclic the gyro will not record the achieved rate. 500d/s is not uber aggressive. First confirm full tail rotor travel with lmts falling between 90 and 120. Make sure the tail is mechanically trimmed in rate mode at your chosen head speed. Increase the angular rate for the tail in 50 d/s increments until you get what you want. You should not require more tail blade length to achieve your desired piro rate, BUT you need to pay attention to how well the tail is holding with less tail blade. Don't make your next problem the tail blowing out

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-22-2016 02:20 PM  15 months agoPost 135
adh1000

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coral springs,florida.usa

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I couldn't think of the right acronym at the time but I did mean 500 degrees per second not rpm, the tail is holding well with no blowouts so far , I did increase the angular rate to 550 and it feels better ,
my normal routine to check for blowouts and tail gain is to fly a sideways loop , backward hurricanes and full throttle funnels , is this the right procedure?
Anthony

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09-22-2016 05:48 PM  15 months agoPost 136
Dr.Ben

rrMaster

Richmond, VA, USA

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That's just fine Anthony. Run as much gain as you can in a variety of maneuvers without getting a wag.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-14-2017 03:01 PM  10 months agoPost 137
adh1000

rrApprentice

coral springs,florida.usa

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is there a way to decrease the spool up speed of the cgy gov , when I spool up now it gets to about 85% of the gov headspeed at which point I take off<this usually takes around 10 seconds then once i'm in the air I hear the rpm's go up and then hold , it also happens after an overspeed , not mad ones like the pro's do but if I climb (pitch pump) at the top if I stay there then the rpm's drop and it takes a few seconds before the rpm's reach their original speed

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