This message from DCMAIR0431@aol.com brought to you by EFLIGHT!

Rob:

Assuming that an input of 500W will fly the Tigermoth, you might consider a
Himax HA2825-2743; Kv=2700, Io=.8, Rm=.041, Gearing 4.3:1. At 17V, required
input current would be 29.4A at 90.3% efficiency. The motor has a nice flat
efficiency curve with max of 91.4% occurring at 18.2 A input current. Output power
would be 452 W at 9917 RPM. An 11 x 7 prop would be suitable.

I believe that the 2825 will work but you might wish to move up to the new
HA-3618-4500. It's also available with 3.3 and 4.3 gearing and is touted to be
used to power planes under 80 oz with direct drive or 100 oz with gearing. The
literature that I have is dated 2/25/05 and indicates that Io, Rm, and power
rating are yet to be announced. You may be able to get it from Maxx.

Trust this helps.

dave


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This message from Rob Bandler <rwb7@cornell.edu> brought to you by EFLIGHT!

Thanks!


>This message from DCMAIR0431@aol.com brought to you by EFLIGHT!
>
>Rob:
>
>Assuming that an input of 500W will fly the Tigermoth, you might consider a
>Himax HA2825-2743; Kv=2700, Io=.8, Rm=.041, Gearing 4.3:1. At 17V, required
>input current would be 29.4A at 90.3% efficiency. The motor has a nice flat
>efficiency curve with max of 91.4% occurring at 18.2 A input
>current. Output power
>would be 452 W at 9917 RPM. An 11 x 7 prop would be suitable.
>
>I believe that the 2825 will work but you might wish to move up to the new
>HA-3618-4500. It's also available with 3.3 and 4.3 gearing and is touted to be
>used to power planes under 80 oz with direct drive or 100 oz with gearing. The
>literature that I have is dated 2/25/05 and indicates that Io, Rm, and power
>rating are yet to be announced. You may be able to get it from Maxx.
>
>Trust this helps.
>
>dave
>
>
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This message from "Ted Temer" <temer@c-zone.net> brought to you by EFLIGHT!

Rob:

I have no argument against Dave's suggestion for the Himax but I feel duty
bound to get in a plug for outrunners simply because I've discovered over
the years that I'm too old and fumble fingered to be able to keep gearboxes
from stripping. Course, I also have this tendency to taxi off into tall
grass with the prop still turning. [sigh]

It would seem to be a simple matter to come up with any electric that would
do the job. The first thought would be, "What kind of IC engine, (and prop),
would it take to fly the Tiger??" I have only seen one model like this and
it was powered with a Saito 50 four stroke. Being familiar with this engine,
I can attest that the engine would swing an 11x6 Zinger between 9000 and
9500 depending on nitro content of the fuel. (Four strokes are VERY nitro
sensitive) I can also state from personal observation that the Saito 50 flew
the Kyosho Tiger Moth quite well. So nice in fact that I am still
considering something similar.

With that amount of power in mind a simple trip to our club's wattage
calculator:
http://www.andersonparkflyers.org/wattage.htm
.... shows a wattage requirement of between 337 and 397 output watts again
depending on how much 4-stroke "nitro" we are trying to equal.

I do have some knowledge of the AXI 2820 series as several friends are
flying them and most use Lypos. This series is quite capable of output power
approaching 400 watts but you would be right at the limit.

There is a new AXI out called the 2826 series which David at his Aircraft
World site says is the most powerful of the 2800 series of motors. It will
easily reach the 500 watt category. This is what David had to say about
potential uses:

"Potential applications for the AXI 2826 Series motors include IC "25" to
"45" class electric conversions, scale gliders up to 2.5 meters, thermal
gliders up to 3 meters, and any number of larger electric models."
http://aircraft-world.com/prod_datas...axi2826-XX.htm

Of course AXI makes two even-larger series of motors but they might actually
be a bit of overkill for the application you have in mind.

Tony La at:
http://www.eflightpacks.com/
.... has a 4 cell 3600 (12C) Lypo that will put out 42 amps and weighs about
ten ounces that should be just right. It hardly weighs any more that an IC
engine fuel tank. (8 ounces plus weight of tank)

Again--the examples that Dave mentioned will be quite good. I am just trying
to add to your options.

Best wishes
Ted Temer AMA 86837
Anderson Park Flyers
Temercraft Designs Redding, CA
temer@c-zone.net
www.temercraft.com/novels/
www.andersonparkflyers.org




> This message from Rob Bandler <rwb7@cornell.edu> brought to you by
EFLIGHT!
>
> Thanks!
>
>
> >This message from DCMAIR0431@aol.com brought to you by EFLIGHT!
> >
> >Rob:
> >
> >Assuming that an input of 500W will fly the Tigermoth, you might consider
a
> >Himax HA2825-2743; Kv=2700, Io=.8, Rm=.041, Gearing 4.3:1. At 17V,
required
> >input current would be 29.4A at 90.3% efficiency. The motor has a nice
flat
> >efficiency curve with max of 91.4% occurring at 18.2 A input
> >current. Output power
> >would be 452 W at 9917 RPM. An 11 x 7 prop would be suitable.
> >
> >I believe that the 2825 will work but you might wish to move up to the
new
> >HA-3618-4500. It's also available with 3.3 and 4.3 gearing and is touted
to be
> >used to power planes under 80 oz with direct drive or 100 oz with
gearing. The
> >literature that I have is dated 2/25/05 and indicates that Io, Rm, and
power
> >rating are yet to be announced. You may be able to get it from Maxx.
> >
> >Trust this helps.
> >
> >dave



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This message from DCMAIR0431@aol.com brought to you by EFLIGHT!

In a message dated 3/25/05 5:00:35 PM Eastern Standard Time, temer@c-zone.net
writes:

> There is a new AXI out called the 2826 series which David at his Aircraft
> World site says is the most powerful of the 2800 series of motors

Ted:

Also a good solution to Rob's problem. The 2826/10 will draw about 36A from a
14V supply using an 11 x 4.7 prop. It's also less expensive than the Himax
partly due, I suppose, to the lack of gears.

dave


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