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HomeAircraftHelicopterHelicopter Main Discussion › Torque vrs rpm
09-06-2017 05:52 AM  15 months agoPost 21
3dorbust

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Hudson Florida usa

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Torque vrs rpm
OK guys here's my heli.first off thanks too all! I have 4 cp helis the only one that is modified is my 450 walkera hobbywing 50 amp ESC , tarot split lock rotor head with new swashplate new CNC tail assembly with carbon fiber 65 mm tail 325mm mains emax 9g digit.swash servos original tail servo as it has served me well. Now I know it's a heavy model but at max head speed and pitch set 90,30,0,30,90 throttle at 20,50,80,100 it fly's OK but when I was learning to hover I set it low hs and high pitch so I got long flight and low heat oops. 4000 kV cheap motor and 3s 35c 3000 ma can I use xk k120 ,WL 950 , or wait to finish my trex 500 clone to learn 3d. HELP !!! My 450 wants to spread it's rotors and fly

I know how Icarus felt

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09-06-2017 06:21 AM  15 months agoPost 22
3dorbust

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Hudson Florida usa

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Torque vrs rpm
Forgot something of course 13t pinion. And the new ESC was a noticeable improvement from all the feedback I may go with 60 amp ESC with governor and good quality 2500 kV motor I now need to think about pinions there cheap enough but I hate to waste $ on motor and ESC suggestions on 6s battery with those changes I doubt I will have a bogging problem and may have a bunch of pieces on the ground I have what takes but I'm just soso right now. Some tricks are easy for me some have been hard as I back out and go back to what I can do well I have crashed of course but I have learned to correct quickly if I have altitude

I know how Icarus felt

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09-06-2017 03:02 PM  15 months agoPost 23
gwright

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Champaign Il

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the torque characteristic is KT

KT*KV=1352,... or 1355, depending on who you hear it from

so torque and rpms are characteristics that are inversely proportional.I've never liked the word "rating" as it implies a higher kv is better, which of course we instinctively think of as more power. It's just a characteristic. Higher KV, less torque, and vice versa, see above . Overall power handling capacity is just motor mass, but a higher kv will be happier with a lower voltage and more current, where a lower kv (and higher kt) will be better served at higher voltage and lower current to achieve the same watts. With the changes in windings for the different kv's you have different size wire, and then there are differences in stator designs,.. different cases for cooling,.. so there are many things that affect the peak power capabilities a little bit, but it's mainly the size, or more accurately stated the mass, of the motor. Also have duty cycle, and for a shorter duty cycle you can shove a LOT more power through a given size motor. This is why you see something stating X watts for 5 seconds, or X watts for 15,.. which is far higher than the continuous capabilities. Since helicopters are a very "bursty" use, with the peaks being several times the average current, they're pretty small for the amount of peak power most are rated for. You generally think of a motor in a plane as capable of about 3 watts per gram, with peaks of 5 or 6 watts per gram. use throttle better so the peaks are shorter duration and you can prop them for higher peak watts. Many heli motors are "rated" at 10 watts or more per gram by the manuf, knowing that it's going to be very bursty, in short duration.

Gary Wright

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09-06-2017 03:45 PM  15 months agoPost 24
EEngineer

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TX

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And the new ESC was a noticeable improvement from all the feedback I may go with 60 amp ESC with governor and good quality 2500 kV motor
Hopefully your new ESC has a governor mode built in.

Learn to set up the governor and use it.

You throttle curves will be much easier to implement and you'll have less bogging.

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 04:08 PM  15 months agoPost 25
Flyin for Jesus

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Troy, IL. 62294

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Yep, get an ESC with a GOV. Not that it is required to have one, but flying 3D is a huge challenge. You can either play with throttle curves all day until you get it how you want it, or you can set the GOV and forget the throttle curves, then you have all day to practice flying.
I'm not lazy by any means... but a GOV does a specific job and does it well. I'll never do throttle curves ever again if I can help it.

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09-06-2017 04:12 PM  15 months agoPost 26
EEngineer

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TX

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You can either play with throttle curves all day until you get it how you want it, or you can set the GOV and forget the throttle curves, then you have all day to practice flying.
Exactly.....

Let the gov do it's thing.....which is to compensate for RPM changes.....rather than set up throttle curves.

It seems intimidating at first, but once you get the hang of its setup.....it's easy and straightforward to do.

And you won't want to go back to curves....

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 04:15 PM  15 months agoPost 27
3dorbust

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Hudson Florida usa

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Torque vrs rpm
Great info on brushless motors from all it will help more than I so I understand it like this voltage is like the psi in a pipe for instance 60 psi water pressure amperage is like the diameter of the pipe at 60 psi a 10 inch water main pipe will give much more water than a one inch pipe at that same 60 psi and ohms is a value of resistance of a wire the lower the better resistance equals heat can 450 helicopters work well with a 2000 or less kV motor I have a belt drive tail

I know how Icarus felt

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09-06-2017 04:38 PM  15 months agoPost 28
EEngineer

rrProfessor

TX

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ohms is a value of resistance of a wire
Using your hydraulic example.....the diameter of the pipe....

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 04:49 PM  15 months agoPost 29
3dorbust

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Hudson Florida usa

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Torque vrs rpm
With the replies I just got I'm buying an ESC with gov,soft start and timing.I seen 335 mm carbons Im using 325s I feel a hole forming in my pocket! Running no expo new ESC with a strong new motor wow wish me good luck

I know how Icarus felt

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09-06-2017 04:56 PM  15 months agoPost 30
3dorbust

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Hudson Florida usa

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Torque vrs rpm
Thanks ffj and eengineer can you pls tell me about you're logo 700xx stock and what it's like now thanks

I know how Icarus felt

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09-06-2017 05:17 PM  15 months agoPost 31
EEngineer

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TX

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My 700XX is the old style with CF frames. Kinda heavy at about 12 lbs, but I have a Kosmik 200HV on it....using the Kos internal governor....only flat throttle curves, even for landing.

Silverline Vbar FBL using JR DSMX satellite RX's.

Use turnbuckles for the servo/swash and swash/grip links instead of the stock links.

Great flying heli.....also a very visible size....which is most important, at least for me.....

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 06:12 PM  15 months agoPost 32
3dorbust

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Hudson Florida usa

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Torque vrs rpm
Nice helicopter! I like high quality models the compass exo looks good. Bling means nothing to me especially in large rc helicopters do you think align clones are OK or get a real trex and was it you that suggested a good used copter vrs new I'm going to research logo

I know how Icarus felt

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09-06-2017 06:27 PM  15 months agoPost 33
EEngineer

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TX

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Bling means nothing to me especially in large rc helicopters
Nothing on my helis are bling.....everything is for a purpose...

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 06:28 PM  15 months agoPost 34
Pistol Pete

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Seffner, FL

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With the replies I just got I'm buying an ESC with gov,soft start and timing.I seen 335 mm carbons Im using 325s I feel a hole forming in my pocket! Running no expo new ESC with a strong new motor wow wish me good luck
You very well may be "unnecessarily" spending money you dont need to.

50A ESC is more than adequate for a 450.

You never mentioned your pitch range other than pitch curve and that can be anything depending on setup such as links lenght.

As an example, Align 450mx 3S motor 3200Kv and a 14T pinion has plenty of power for that class. Also unknown is the head speed where 3500rpm is adequate. Do you know your main gear tooth count?

I searched for your model and only found the V2 with a tail motor and doesnt seem to be same given you mentioned using a tail servo.

Have you had anyone in your area have a lookover at your heli?

You are about an hour from my club and we have a few rotor heads that will happily help hands on.

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

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09-06-2017 08:02 PM  15 months agoPost 35
3dorbust

rrNovice

Hudson Florida usa

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Torque vrs rpm
To engineer I surely did not want to imply your heli was just bling I mean wow it's a logo heli I just looked at your 700xx I know it kicks ass I just wanted to say I don't want to get sucked in by the bling factor hey pistol Pete I just replied to you on expo but reading the reply just now its obvious I need to go to your club I found a place to learn and fly properly my 450 helicopter is a upgraded walkera 450do3 pls let me know if you want to know my modifications it's not a dog and in the right hands it should do fair 3d I'm going to find info on the club

I know how Icarus felt

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09-06-2017 09:35 PM  15 months agoPost 36
EEngineer

rrProfessor

TX

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To engineer I surely did not want to imply your heli was just bling
No biggy....

Logo 600SXs, 800XX, TDR IIs

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09-06-2017 10:31 PM  15 months agoPost 37
GyroFreak

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Orlando Florida ...28N 81W

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Nothing on my helis are bling.....everything is for a purpose...
What about the canopy, I never flew with canopy since I crashed a lot. Isn't canopy a type of bling ?

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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09-06-2017 10:53 PM  15 months agoPost 38
EEngineer

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TX

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Come on.....

You want to get bug guts all over your ESC, motor, and servos?

Logo 600SXs, 800XX, TDR IIs

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09-07-2017 08:16 PM  15 months agoPost 39
Pistol Pete

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Seffner, FL

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What about the canopy, I never flew with canopy since I crashed a lot. Isn't canopy a type of bling ?
Canopy helps me with orientation and I wonder if your crashing alot for not using one? Catch 22?

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

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09-08-2017 12:18 AM  15 months agoPost 40
ICUR1-2

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Ottawa, Ontario

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A custom canopy could be considered bling. It almost makes you cry when they go crunch.

spending time, paying attention

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HomeAircraftHelicopterHelicopter Main Discussion › Torque vrs rpm
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