is motor calc the only way to get prop battery motors set up, or is 
there a way of estimating power from say a 1000kv motor on 11.1v pulling 
200w on a 11*6 prop how much difference in power used a 12*6 would make 
or going to 14.8v ETC
Kevin

Kevin wrote:
> is motor calc the only way to get prop battery motors set up, or is 
> there a way of estimating power from say a 1000kv motor on 11.1v pulling 
> 200w on a 11*6 prop how much difference in power used a 12*6 would make 
> or going to 14.8v ETC
> Kevin
You can do the maths bare,or there are other and free calculators as well.


But for the money, motocalc is still waht I sue.

Best money ever spent really.

BUT with caveats. Not all props/motors/batteries are created equal. The 
only real answer is a tacho and a whattmeter as well.

The Natural Philosopher wrote:
> Kevin wrote:
>> is motor calc the only way to get prop battery motors set up, or is 
>> there a way of estimating power from say a 1000kv motor on 11.1v 
>> pulling 200w on a 11*6 prop how much difference in power used a 12*6 
>> would make or going to 14.8v ETC
>> Kevin
> You can do the maths bare,or there are other and free calculators as well.
> 
> 
> But for the money, motocalc is still waht I sue.
> 
> Best money ever spent really.
> 
> BUT with caveats. Not all props/motors/batteries are created equal. The 
> only real answer is a tacho and a whattmeter as well.
I have both thanks to Father Christmas and I quickly found on my setup 
in my Zagi was pulling 300w from a 200w rated motor and 7A peak more 
than my ESC an bit over proped, but boy did it go that was on a 8*6 prop 
dropping down to a 7*6 has brought the amps back to 25A and the watts 
back to 200 not flown it since
but I am just electrifying a ARTF Black horse Belanca Decathlon and the 
current set-up is only 200 or so watts and 20 odd amps (holding the 
motor mount by hand so the readings are a bit sketchy) but I dont know 
whats the best thing to order next more celled(if thats a word) LiPo 
instead of my 3 cell or go for a bigger prop or both? as my motors are 
not on the motor calc's data base Hong Kong / Chinese Hextronixs its 
still guess work

Kevin wrote:
> The Natural Philosopher wrote:
>> Kevin wrote:
>>> is motor calc the only way to get prop battery motors set up, or is 
>>> there a way of estimating power from say a 1000kv motor on 11.1v 
>>> pulling 200w on a 11*6 prop how much difference in power used a 12*6 
>>> would make or going to 14.8v ETC
>>> Kevin
>> You can do the maths bare,or there are other and free calculators as 
>> well.
>>
>>
>> But for the money, motocalc is still waht I sue.
>>
>> Best money ever spent really.
>>
>> BUT with caveats. Not all props/motors/batteries are created equal. 
>> The only real answer is a tacho and a whattmeter as well.
> I have both thanks to Father Christmas and I quickly found on my setup 
> in my Zagi was pulling 300w from a 200w rated motor and 7A peak more 
> than my ESC an bit over proped, but boy did it go that was on a 8*6 prop 
> dropping down to a 7*6 has brought the amps back to 25A and the watts 
> back to 200 not flown it since
> but I am just electrifying a ARTF Black horse Belanca Decathlon and the 
> current set-up is only 200 or so watts and 20 odd amps (holding the 
> motor mount by hand so the readings are a bit sketchy) but I dont know 
> whats the best thing to order next more celled(if thats a word) LiPo 
> instead of my 3 cell or go for a bigger prop or both? as my motors are 
> not on the motor calc's data base Hong Kong / Chinese Hextronixs its 
> still guess work

Kevin. here is what you need.
http://www.rcgroups.com/power-systems-13/

Its free. Register and ask, and someone - possibly even myself, but in a 
different moniker :-) - will answer.

You will get far more information plus probably results from someone who 
knows the model, the motor, or both.

Essentially if the motor stays cool enough, and the voltage is holding 
up on the pack, add more prop!

The Natural Philosopher wrote:
> Kevin wrote:
>> The Natural Philosopher wrote:
>>> Kevin wrote:
>>>> is motor calc the only way to get prop battery motors set up, or is 
>>>> there a way of estimating power from say a 1000kv motor on 11.1v 
>>>> pulling 200w on a 11*6 prop how much difference in power used a 12*6 
>>>> would make or going to 14.8v ETC
>>>> Kevin
>>> You can do the maths bare,or there are other and free calculators as 
>>> well.
>>>
>>>
>>> But for the money, motocalc is still waht I sue.
>>>
>>> Best money ever spent really.
>>>
>>> BUT with caveats. Not all props/motors/batteries are created equal. 
>>> The only real answer is a tacho and a whattmeter as well.
>> I have both thanks to Father Christmas and I quickly found on my setup 
>> in my Zagi was pulling 300w from a 200w rated motor and 7A peak more 
>> than my ESC an bit over proped, but boy did it go that was on a 8*6 
>> prop dropping down to a 7*6 has brought the amps back to 25A and the 
>> watts back to 200 not flown it since
>> but I am just electrifying a ARTF Black horse Belanca Decathlon and 
>> the current set-up is only 200 or so watts and 20 odd amps (holding 
>> the motor mount by hand so the readings are a bit sketchy) but I dont 
>> know whats the best thing to order next more celled(if thats a word) 
>> LiPo instead of my 3 cell or go for a bigger prop or both? as my 
>> motors are not on the motor calc's data base Hong Kong / Chinese 
>> Hextronixs its still guess work
> 
> Kevin. here is what you need.
> http://www.rcgroups.com/power-systems-13/
> 
> Its free. Register and ask, and someone - possibly even myself, but in a 
> different moniker :-) - will answer.
> 
> You will get far more information plus probably results from someone who 
> knows the model, the motor, or both.
> 
> Essentially if the motor stays cool enough, and the voltage is holding 
> up on the pack, add more prop!
> 
> 
> 
just curious AXI motors are missing from Motor Calc as well but just 
going to bolt the motor mount to the airframe for a better idea of the 
power used and I will ask on rcgroups a bit later I

Kevin  wrote:
> The Natural Philosopher wrote:
>> Kevin wrote:
>>> is motor calc the only way to get prop battery motors set up, or is 
>>> there a way of estimating power from say a 1000kv motor on 11.1v 
>>> pulling 200w on a 11*6 prop how much difference in power used a 12*6 
>>> would make or going to 14.8v ETC
>>> Kevin
>> You can do the maths bare,or there are other and free calculators as well.
>> 
>> 
>> But for the money, motocalc is still waht I sue.
>> 
>> Best money ever spent really.
>> 
>> BUT with caveats. Not all props/motors/batteries are created equal. The 
>> only real answer is a tacho and a whattmeter as well.
> I have both thanks to Father Christmas and I quickly found on my setup 
> in my Zagi was pulling 300w from a 200w rated motor and 7A peak more 
> than my ESC an bit over proped, but boy did it go that was on a 8*6 prop 
> dropping down to a 7*6 has brought the amps back to 25A and the watts 
> back to 200 not flown it since

Bear in mind that there is a surprising difference between current on the
ground and current in the air.  I've an in-flight data logger and the
difference in the peak currents can be as much as, for example, 30A on
the ground (when the prop's under maximum load) vs 20A in the air (when
the prop's usually under less load if the model is not stationary).

I was surprised by the size of the difference between the readings, I'd
expected no more than about 10% or so, but 20% has been pretty typical
for the (albeit limited number of) models I've measured and one was more 
than 30%.

It could also be that if you use the throttle "properly" (ie not always 
full on) your choice of larger prop might be OK anyway.  It depends if
the model could do with the extra punch sometimes but mostly flies 
properly on a fraction of the throttle or not.  Mind you, it's a
Zagi, so I guess full throttle all flight is the order of the day ;-)

Noddy

Nobody Here wrote:
> Kevin  wrote:
>> The Natural Philosopher wrote:
>>> Kevin wrote:
>>>> is motor calc the only way to get prop battery motors set up, or is 
>>>> there a way of estimating power from say a 1000kv motor on 11.1v 
>>>> pulling 200w on a 11*6 prop how much difference in power used a 12*6 
>>>> would make or going to 14.8v ETC
>>>> Kevin
>>> You can do the maths bare,or there are other and free calculators as well.
>>>
>>>
>>> But for the money, motocalc is still waht I sue.
>>>
>>> Best money ever spent really.
>>>
>>> BUT with caveats. Not all props/motors/batteries are created equal. The 
>>> only real answer is a tacho and a whattmeter as well.
>> I have both thanks to Father Christmas and I quickly found on my setup 
>> in my Zagi was pulling 300w from a 200w rated motor and 7A peak more 
>> than my ESC an bit over proped, but boy did it go that was on a 8*6 prop 
>> dropping down to a 7*6 has brought the amps back to 25A and the watts 
>> back to 200 not flown it since
> 
> Bear in mind that there is a surprising difference between current on the
> ground and current in the air.  I've an in-flight data logger and the
> difference in the peak currents can be as much as, for example, 30A on
> the ground (when the prop's under maximum load) vs 20A in the air (when
> the prop's usually under less load if the model is not stationary).
> 
> I was surprised by the size of the difference between the readings, I'd
> expected no more than about 10% or so, but 20% has been pretty typical
> for the (albeit limited number of) models I've measured and one was more 
> than 30%.
> 
> It could also be that if you use the throttle "properly" (ie not always 
> full on) your choice of larger prop might be OK anyway.  It depends if
> the model could do with the extra punch sometimes but mostly flies 
> properly on a fraction of the throttle or not.  Mind you, it's a
> Zagi, so I guess full throttle all flight is the order of the day ;-)
> 
> Noddy
the Zagi did fly for quite a few flights before the power meter arrived 
but as it only stores peak values my meter wont show the true in flight 
readings, I normally potter round and then go vertical for a few seconds 
  and I do mean vertical  and have another potter looking for thermals 
and when it gets to low back to vertical and get some more height it 
will maintain heights on 1/4 or less throttle and the cycle continues 
until I get bored
Kevin

Kevin wrote:
> The Natural Philosopher wrote:
>> Kevin wrote:
>>> The Natural Philosopher wrote:
>>>> Kevin wrote:
>>>>> is motor calc the only way to get prop battery motors set up, or is 
>>>>> there a way of estimating power from say a 1000kv motor on 11.1v 
>>>>> pulling 200w on a 11*6 prop how much difference in power used a 
>>>>> 12*6 would make or going to 14.8v ETC
>>>>> Kevin
>>>> You can do the maths bare,or there are other and free calculators as 
>>>> well.
>>>>
>>>>
>>>> But for the money, motocalc is still waht I sue.
>>>>
>>>> Best money ever spent really.
>>>>
>>>> BUT with caveats. Not all props/motors/batteries are created equal. 
>>>> The only real answer is a tacho and a whattmeter as well.
>>> I have both thanks to Father Christmas and I quickly found on my 
>>> setup in my Zagi was pulling 300w from a 200w rated motor and 7A peak 
>>> more than my ESC an bit over proped, but boy did it go that was on a 
>>> 8*6 prop dropping down to a 7*6 has brought the amps back to 25A and 
>>> the watts back to 200 not flown it since
>>> but I am just electrifying a ARTF Black horse Belanca Decathlon and 
>>> the current set-up is only 200 or so watts and 20 odd amps (holding 
>>> the motor mount by hand so the readings are a bit sketchy) but I dont 
>>> know whats the best thing to order next more celled(if thats a word) 
>>> LiPo instead of my 3 cell or go for a bigger prop or both? as my 
>>> motors are not on the motor calc's data base Hong Kong / Chinese 
>>> Hextronixs its still guess work
>>
>> Kevin. here is what you need.
>> http://www.rcgroups.com/power-systems-13/
>>
>> Its free. Register and ask, and someone - possibly even myself, but in 
>> a different moniker :-) - will answer.
>>
>> You will get far more information plus probably results from someone 
>> who knows the model, the motor, or both.
>>
>> Essentially if the motor stays cool enough, and the voltage is holding 
>> up on the pack, add more prop!
>>
>>
>>
> just curious AXI motors are missing from Motor Calc

Not on mine they aint..try under 'Model Motors..'
> as well but just 
> going to bolt the motor mount to the airframe for a better idea of the 
> power used and I will ask on rcgroups a bit later I

The Natural Philosopher wrote:
> Kevin wrote:
>> The Natural Philosopher wrote:
>>> Kevin wrote:
>>>> The Natural Philosopher wrote:
>>>>> Kevin wrote:
>>>>>> is motor calc the only way to get prop battery motors set up, or 
>>>>>> is there a way of estimating power from say a 1000kv motor on 
>>>>>> 11.1v pulling 200w on a 11*6 prop how much difference in power 
>>>>>> used a 12*6 would make or going to 14.8v ETC
>>>>>> Kevin
>>>>> You can do the maths bare,or there are other and free calculators 
>>>>> as well.
>>>>>
>>>>>
>>>>> But for the money, motocalc is still waht I sue.
>>>>>
>>>>> Best money ever spent really.
>>>>>
>>>>> BUT with caveats. Not all props/motors/batteries are created equal. 
>>>>> The only real answer is a tacho and a whattmeter as well.
>>>> I have both thanks to Father Christmas and I quickly found on my 
>>>> setup in my Zagi was pulling 300w from a 200w rated motor and 7A 
>>>> peak more than my ESC an bit over proped, but boy did it go that was 
>>>> on a 8*6 prop dropping down to a 7*6 has brought the amps back to 
>>>> 25A and the watts back to 200 not flown it since
>>>> but I am just electrifying a ARTF Black horse Belanca Decathlon and 
>>>> the current set-up is only 200 or so watts and 20 odd amps (holding 
>>>> the motor mount by hand so the readings are a bit sketchy) but I 
>>>> dont know whats the best thing to order next more celled(if thats a 
>>>> word) LiPo instead of my 3 cell or go for a bigger prop or both? as 
>>>> my motors are not on the motor calc's data base Hong Kong / Chinese 
>>>> Hextronixs its still guess work
>>>
>>> Kevin. here is what you need.
>>> http://www.rcgroups.com/power-systems-13/
>>>
>>> Its free. Register and ask, and someone - possibly even myself, but 
>>> in a different moniker :-) - will answer.
>>>
>>> You will get far more information plus probably results from someone 
>>> who knows the model, the motor, or both.
>>>
>>> Essentially if the motor stays cool enough, and the voltage is 
>>> holding up on the pack, add more prop!
>>>
>>>
>>>
>> just curious AXI motors are missing from Motor Calc
> 
> Not on mine they aint..try under 'Model Motors..'
>> as well but just going to bolt the motor mount to the airframe for a 
>> better idea of the power used and I will ask on rcgroups a bit later I
Ah never looked there I was looking at AXI doh thanks