This message from "Ron van Sommeren" <ron.van.sommeren@hetnet.nl> brought to you by EFLIGHT!


Goedendag ;-)


> Hey gang I' having one of my Sr. moments. One of the electric
> calculation programs is MtoCalc...

A compilation of e-flight calculators.
* D-calc (freeware)
http://www.yahoogroups.com/group/D-calc
* MM_calc, English, Louis Fourdan (freeware)
http://electrofly.free.fr/ -> telechargements -> moteurs -> MM_calc_v206
Criticism and suggestions:
http://www.rcgroups.com/forums/showthread.php?t=583327
* Motocalc
http://www.motocalc.com
* Elektro-Antrieb
http://www.geck-elektroantrieb.de
* P-calc (freeware)
http://brantuas.com/ezcalc/dma1.asp
* E-Calc
http://www.slkelectronics.com/ecalc/index.htm
* Mumtats (freeware)
http://www.groups.com/forums/showthread.php?t=233250
* Rod Badcock's calculators (freeware)
http://www.badcock.net
* Peak efficiency (freeware)
http://www.peakeff.com

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, Netherlands
int. Electric fly-in, Aug.26, http://home.hetnet.nl/~ronvans/


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This message from elmer <edm100485@sbcglobal.net> brought to you by EFLIGHT!

Thank You, thank you, thank you all for the e-flight calculators.....I'll have fun making comparisons I'm. putting them all into a folder


elmer



----- Original Message ----
From: Ron van Sommeren <ron.van.sommeren@hetnet.nl>
To: eflight@ezonemag.com
Sent: Sunday, May 6, 2007 4:06:29 PM
Subject: [EFLT] e-flight calculators


This message from "Ron van Sommeren" <ron.van.sommeren@hetnet.nl> brought to you by EFLIGHT!


Goedendag ;-)


> Hey gang I' having one of my Sr. moments. One of the electric
> calculation programs is MtoCalc...

A compilation of e-flight calculators.
* D-calc (freeware)
http://www.yahoogroups.com/group/D-calc
* MM_calc, English, Louis Fourdan (freeware)
http://electrofly.free.fr/ -> telechargements -> moteurs -> MM_calc_v206
Criticism and suggestions:
http://www.rcgroups.com/forums/showthread.php?t=583327
* Motocalc
http://www.motocalc.com
* Elektro-Antrieb
http://www.geck-elektroantrieb.de
* P-calc (freeware)
http://brantuas.com/ezcalc/dma1.asp
* E-Calc
http://www.slkelectronics.com/ecalc/index.htm
* Mumtats (freeware)
http://www.groups.com/forums/showthread.php?t=233250
* Rod Badcock's calculators (freeware)
http://www.badcock.net
* Peak efficiency (freeware)
http://www.peakeff.com

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, Netherlands
int. Electric fly-in, Aug.26, http://home.hetnet.nl/~ronvans/


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This message from "Alan Bedingham" <bbba18333@blueyonder.co.uk> brought to you by EFLIGHT!

My memory says that someone on this list had worked out a way to relate the
maximum power a motor is capable of based on it's weight. I seem to
remember that it was some sort of Watt/gram number based on the heat the
mass of metal could dissipate and the efficiency of the motor; and at that
time was for ferrite and rare earth brushed motors. Anyone else remember
this?
Is there any such rule of thumb for outrunners?

Regards
Alan Bedingham



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This message from Kenneth Myers <kmyersefo@yahoo.com> brought to you by EFLIGHT!


--- Alan Bedingham <bbba18333@blueyonder.co.uk> wrote:


> My memory says that someone on this list had worked
> out a way to relate the
> maximum power a motor is capable of based on it's
> weight. I seem to
> remember that it was some sort of Watt/gram number
> based on the heat the
> mass of metal could dissipate and the efficiency of
> the motor; and at that
> time was for ferrite and rare earth brushed motors.
> Anyone else remember
> this?

While it is true there are many variables involved, I
have been using watts per g of weight to help in my
motor selection for several years now. It is based on
hundreds of reported uses of OUTRUNNER motors. I've
not reached any kind of conclusion for inner runners.
CD-ROM motors, high rev outrunners, homemade motors do
not fall into the group, but the majority of
outrunners do. The range I use is 1.5 watts in per
gram of motor weight as the least to use without
dropping down to a lower weight motor. My data
indicates the highest used by some is about 3.5 watts
in per gram of motor weight, while with motors for my
personal use, I go to 3 watts in per gram of motor
weight as my maximum, and generally try to use 2.5 -
2.75. I totally agree that this does not work with
all out runners! I noted the exceptions before, and
of course there are others but it works for me when
trying to pick an outrunner. I also have enough data
that I am comfortable saying that brushed motors are
typically used at 0.75 watts in to 1 watt in per g of
motor weight with the AF cobalts going up to 1.25
watts in per g of motor weight. Again, I have not
collected enough data for inner runner brushless,
there uses just have not been reported on in the
modeling press and Internet as much as the others, but
I have seen a trend that seems to imply about double
the numbers for outrunners. To me, it is just one
more "clue" in picking a motor for a specific
application.

Ken Myers, Walled Lake, MI USA



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This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

>My memory says that someone on this list had worked out a way to relate
>the maximum power a motor is capable of based on it's weight.
Alan is right, but the key was that the waste heat is related to the weight
of the motor. The mass of the motor is the single most important variable in
determining the maximum power that a motor can handle. When you think about
it, of course, that must be true. Comparing a 10W watt motor to a 1000W
motor, the obvious difference is one is way bigger. Magnet strength, wire
diameter and construction are relatively unimportant.
From measurements of actual motors, the relationship for brushed explained
about 90% of the variation. I'll see if I can find the data and some of the
graphs.

Rick.



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This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

>brushed motors are typically used at 1 watt per g
That is the standard steady-state relationship that has been used for
brushed and brushless motors. A specialized, high efficiency motor can do
3W/g but it would need to be well into the 90% efficiency range to handle
that much power. We regularly exceed these power ratings with short motor
runs and lots of forced air cooling, but that has nothing to do with the
motor.
I can't find the actual graphs. My recollection is that Dr. Kiwi on
RCGroups produced the 90% relationship between power and mass.

Rick.


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This message from "Alan Bedingham" <bbba18333@blueyonder.co.uk> brought to you by EFLIGHT!

Thanks Ken, just what I was looking for. Any chance you could share the
data you've got? Maybe an article in the Ampeer Flyer?
Thanks also to Rick Page for his helpful comments.
This is a great list for getting help, someone always know the answer!

Regards
Alan Bedingham
>
> While it is true there are many variables involved, I
> have been using watts per g of weight to help in my
> motor selection for several years now. It is based on
> hundreds of reported uses of OUTRUNNER motors. I've
> not reached any kind of conclusion for inner runners.
> CD-ROM motors, high rev outrunners, homemade motors do
> not fall into the group, but the majority of
> outrunners do. The range I use is 1.5 watts in per
> gram of motor weight as the least to use without
> dropping down to a lower weight motor. My data
> indicates the highest used by some is about 3.5 watts
> in per gram of motor weight, while with motors for my
> personal use, I go to 3 watts in per gram of motor
> weight as my maximum, and generally try to use 2.5 -
> 2.75. I totally agree that this does not work with
> all out runners! I noted the exceptions before, and
> of course there are others but it works for me when
> trying to pick an outrunner. I also have enough data
> that I am comfortable saying that brushed motors are
> typically used at 0.75 watts in to 1 watt in per g of
> motor weight with the AF cobalts going up to 1.25
> watts in per g of motor weight. Again, I have not
> collected enough data for inner runner brushless,
> there uses just have not been reported on in the
> modeling press and Internet as much as the others, but
> I have seen a trend that seems to imply about double
> the numbers for outrunners. To me, it is just one
> more "clue" in picking a motor for a specific
> application.
>
> Ken Myers, Walled Lake, MI USA
>



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This message from Kenneth Myers <kmyersefo@yahoo.com> brought to you by EFLIGHT!


--- Alan Bedingham <bbba18333@blueyonder.co.uk> wrote:


> Thanks Ken, just what I was looking for. Any chance
> you could share the
> data you've got? Maybe an article in the Ampeer
> Flyer?

I'll be happy to share the data with anyone who would
like it. It is way too much to fit in an Ampeer,
although I have mentioned summarized parts of it on
occasion. I have the data in an Excel spreadsheet and
would be happy to send it to anyone who just drops me
an email at kmyersefo@aol.com and asks for it.
It is a work in progress, has some "odd" things and
notes with it and changes month to month as the
magazines come out and also when I "find" new info on
the Web.

Ken Myers, Walled Lake, MI USA



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This message from Kenneth Myers <kmyersefo@yahoo.com> brought to you by EFLIGHT!

Hi,

The June 2007 Ampeer has been posted to
http://members.aol.com/kmyersefo

As always, there is a direct link to the .pdf and HTML
version on the first page.

The Mid-America Electric Flies are coming up on July 7
and 8 and I’ve posted the link to the flyer and
map/hotel pages on the site’s homepage.

Sure glad flying season is here for us in the northern
sections of this planet.

Enjoy,
Ken



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This message from "James Feeney" <james.feeney@ic24.net> brought to you by EFLIGHT!

Hi Ron, can you point me in the right direction to find out how to add a
balancer to a three cell Kokam Lipo. I'm sure I've seen it on the web but
can't remember where.
many thanks, Jim
----- Original Message -----
From: "Ron van Sommeren" <ron.van.sommeren@hetnet.nl>
To: <eflight@ezonemag.com>
Sent: Sunday, May 06, 2007 9:06 PM
Subject: [EFLT] e-flight calculators


This message from "Ron van Sommeren" <ron.van.sommeren@hetnet.nl> brought to
you by EFLIGHT!


Goedendag ;-)


> Hey gang I' having one of my Sr. moments. One of the electric
> calculation programs is MtoCalc...

A compilation of e-flight calculators.
* D-calc (freeware)
http://www.yahoogroups.com/group/D-calc
* MM_calc, English, Louis Fourdan (freeware)
http://electrofly.free.fr/ -> telechargements -> moteurs -> MM_calc_v206
Criticism and suggestions:
http://www.rcgroups.com/forums/showthread.php?t=583327
* Motocalc
http://www.motocalc.com
* Elektro-Antrieb
http://www.geck-elektroantrieb.de
* P-calc (freeware)
http://brantuas.com/ezcalc/dma1.asp
* E-Calc
http://www.slkelectronics.com/ecalc/index.htm
* Mumtats (freeware)
http://www.groups.com/forums/showthread.php?t=233250
* Rod Badcock's calculators (freeware)
http://www.badcock.net
* Peak efficiency (freeware)
http://www.peakeff.com

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, Netherlands
int. Electric fly-in, Aug.26, http://home.hetnet.nl/~ronvans/


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This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

The Amp Aviators have an article. The connections on the end of the battery
are often different than shown. The easiest ones are those like Kokam that
have a small PCB that each cell is soldered to. Keep in mind that you could
damage the battery so it may not be worth the effort.

http://www.ampaviators.com/
http://www.ampaviators.com/index.php...ask=view&id=53

RCGroups as always, has tons of information.
http://www.rcgroups.com/forums/showthread.php?t=426107

Rick.


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This message from "Bill Conkling" <conk@widomaker.com> brought to you by EFLIGHT!

I really wish people would change the [subject:] line when they change the
"subject" of an email thread.




-----Original Message-----
From: owner-eflight@ezonemag.com [mailtowner-eflight@ezonemag.com] On
Behalf Of James Feeney
Sent: Sunday, January 27, 2008 10:25 AM
To: eflight@ezonemag.com
Subject: Re: [EFLT] e-flight calculators

This message from "James Feeney" <james.feeney@ic24.net> brought to you by
EFLIGHT!

Hi Ron, can you point me in the right direction to find out how to add a
balancer to a three cell Kokam Lipo. I'm sure I've seen it on the web but
can't remember where.
many thanks, Jim
----- Original Message -----
From: "Ron van Sommeren" <ron.van.sommeren@hetnet.nl>
To: <eflight@ezonemag.com>
Sent: Sunday, May 06, 2007 9:06 PM
Subject: [EFLT] e-flight calculators


This message from "Ron van Sommeren" <ron.van.sommeren@hetnet.nl> brought to
you by EFLIGHT!


Goedendag ;-)


> Hey gang I' having one of my Sr. moments. One of the electric
> calculation programs is MtoCalc...

A compilation of e-flight calculators.
* D-calc (freeware)
http://www.yahoogroups.com/group/D-calc
* MM_calc, English, Louis Fourdan (freeware)
http://electrofly.free.fr/ -> telechargements -> moteurs -> MM_calc_v206
Criticism and suggestions:
http://www.rcgroups.com/forums/showthread.php?t=583327
* Motocalc
http://www.motocalc.com
* Elektro-Antrieb
http://www.geck-elektroantrieb.de
* P-calc (freeware)
http://brantuas.com/ezcalc/dma1.asp
* E-Calc
http://www.slkelectronics.com/ecalc/index.htm
* Mumtats (freeware)
http://www.groups.com/forums/showthread.php?t=233250
* Rod Badcock's calculators (freeware)
http://www.badcock.net
* Peak efficiency (freeware)
http://www.peakeff.com

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, Netherlands
int. Electric fly-in, Aug.26, http://home.hetnet.nl/~ronvans/


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It has removed 128 spam emails to date.
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This message from Jim K <jkeller11@adelphia.net> brought to you by EFLIGHT!

Absolute attention and care is necessary when working on previously
assembled packs. Often one must cut and remove multiple layers of
insulating tape covering the cell terminals. Use non-metallic tools
whenever and wherever possible. One brief short to a cell can cause it
to immediately go into thermal overload.



Rick Page wrote:

>Keep in mind that you could damage the battery so it may not be worth the effort.
>
>



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This message from Dan Wenz <djwenz@comcast.net> brought to you by EFLIGHT!

Rick Page wrote:


> The Amp Aviators have an article. The connections on the end of the battery
> are often different than shown. The easiest ones are those like Kokam that
> have a small PCB that each cell is soldered to. Keep in mind that you could
> damage the battery so it may not be worth the effort.
>
> http://www.ampaviators.com/
> http://www.ampaviators.com/index.php...ask=view&id=53
>
> RCGroups as always, has tons of information.
> http://www.rcgroups.com/forums/showthread.php?t=426107

Thanks, also.


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The dates for the 2008 Mid-Am (Mid-America Electric Flies) are July 12 & 13

2008 Flyer: http://homepage.mac.com/kmyersefo/flyer.pdf

Map to new flying field location & Hotels list:
http://homepage.mac.com/kmyersefo/map-hotels.pdf