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HelicopterMain Discussion › Best endurance gasoline heli?
04-21-2017 08:21 PM  65 days agoPost 41
gwright

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Champaign Il

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200w/kg seems pretty high on the power level. my 700 does smooth aerobatics averaging slightly more than 1/3 of that. A recent flight went 17 minutes using 3500mah doing smooth aerobatics, and according to telemetry logs of current, just hovering would be over half hour. That's not even optimized for hovering endurance, it's a sport and smooth 3D machine. Maybe a gasser needs deeper gearing to turn less revs. I'm anxious to see what Chago comes up with for rules. It will all depend on working within those rules.

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-21-2017 08:42 PM  65 days agoPost 42
revmix

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NJ

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nah, not for me
although have some low RPM helis with asymmetrical blades setup for best lift
(.60 size nitro converted to electric with Quick Ray Power (550 or .30 size) 645KV 8s motor & freewheeling ESC on 6s spinning 620mm mains with stock tail blades, normal T curve 0-72.5-75-77.5-80%, with less could hover only for long time)

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04-21-2017 09:19 PM  65 days agoPost 43
revmix

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NJ

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200w/kg seems pretty high on the power level.
double check, notice kg & lb
50-60 W/lb for hovering
100 W/lb for aerobatics
120 W/lb for most 3D
150+ W/lb for extreme 3D
https://rc.runryder.com/helicopter/t150908p1/

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04-21-2017 09:34 PM  65 days agoPost 44
gwright

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Champaign Il

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Yes I completely understand kg to lb. You stated 200 watts/kg which is roughly 90.9 watts per pound, and I'm seeing just over 32 watts per pound to do smooth LHS aerobatics with my current setup.

Gary Wright
Futaba
Flightpower
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04-21-2017 09:49 PM  65 days agoPost 45
revmix

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stated 200
missed the ~ sign

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04-21-2017 09:58 PM  65 days agoPost 46
revmix

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NJ

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32 watts per pound
what's the total weight of the 700 heli & lipo?

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04-21-2017 10:32 PM  65 days agoPost 47
gwright

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Champaign Il

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9.75 LBS

Gary Wright
Futaba
Flightpower
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04-21-2017 10:46 PM  65 days agoPost 48
revmix

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how is the 32 figured with electric motor?

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04-21-2017 11:23 PM  65 days agoPost 49
Heli_Splatter

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Silver Spring, MD by way of Sidney, Ne - USA

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Endurance??? gas#1, glow#2, electric(distant)#3

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04-21-2017 11:26 PM  65 days agoPost 50
gwright

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Champaign Il

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It's pretty simple math using the time of flight, and capacity used, using the nominal voltage of the battery. I use telemetry to confirm the numbers, plus I sometimes pull logs from the ESC to repeat the math with those values to confirm.

Gary Wright
Futaba
Flightpower
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04-21-2017 11:40 PM  65 days agoPost 51
revmix

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simple math
OK, what numbers add up to 32 (under hover poWer for aerobatics)?

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04-21-2017 11:47 PM  65 days agoPost 52
gwright

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Champaign Il

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average 7 amps according to esc log, nominal voltage is 44.4, 7 times 44,4 is 310 watts, 310 watts (average during flight) divided by 9.75 lbs is 31.87 watts per pound. That's the average. Peaks are recorded in the 51 to 61 amp range depending on how I fly, so say 61 amps at 44.4 volts nominal is 2708 watts peak, which is 3.59 horesepower, although average is about 6/10 of a horsepower. one horsepower is 754 watts.

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-22-2017 12:00 AM  65 days agoPost 53
gwright

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Champaign Il

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we've gotten somewhat off topic here. What rules are you considering Chago?

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-22-2017 12:03 AM  65 days agoPost 54
revmix

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NJ

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6/10 of a horsepower
isn't that calculation for airplane?
helicopter with IC engine works about 1:1 power/weight ratio, so something may be missing

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04-22-2017 12:14 AM  65 days agoPost 55
gwright

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Champaign Il

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a horsepower is a horsepower, doesn't matter what it's powering.Depending on which source you believe, it's somewhere between 750 and 754 watts per horsepower.

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-22-2017 12:27 AM  65 days agoPost 56
revmix

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NJ

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750 and 754 watts per horsepower.
what's the heli's E motor rating (Watts or HP)?

power 3.59HP 2708W : weight 9.75=277.7W/lb

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04-22-2017 12:44 AM  65 days agoPost 57
oldfart

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Vancouver, Canada

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Gary, tell them what head speed you are turning on that rig.

Phil

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04-22-2017 01:17 AM  65 days agoPost 58
gwright

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Champaign Il

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There is no real wattage rating from the manuf. This is a hacker turnado, but it's been rewound for lower kv than is normally offered. it's 455 grams, and roughly 350kv.
I turn 1150 and 1450 on the 700,.. mostly stay at 1150, using +16/-16 pitch

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-22-2017 11:33 PM  64 days agoPost 59
oldfart

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Vancouver, Canada

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Thank you Gary, those rotor speeds and that pitch range illustrates how the low rotor speeds give the endurance (longer flights) and the large pitch range will return a lot of the lost cyclic and collective response like I mentioned earlier.

Phil

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04-23-2017 12:04 AM  64 days agoPost 60
revmix

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NJ

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large pitch range will return a lot of the lost cyclic and collective response
isn't the +/-16 collective pitch?
cyclic should be 8-10?
cyclic response depends on rotor RPM & stick DR

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