Which sustainer system would you chose for your sailplane?

On 9/24/2012 3:39 PM, Renny wrote:


Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully, it will answer some of the many questions that are out there!

http://www.front-electric-sustainer....katalog_V2.pdf

Thanks - Renny



Interesting that the Silent has more battery capacity than the LAK. I
wonder if the LAK can be modified to take the larger battery capacity.

On Monday, September 24, 2012 4:53:12 PM UTC-6, Greg Arnold wrote:
On 9/24/2012 3:39 PM, Renny wrote:





Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully, it will answer some of the many questions that are out there!



http://www.front-electric-sustainer....katalog_V2.pdf



Thanks - Renny







Interesting that the Silent has more battery capacity than the LAK. I

wonder if the LAK can be modified to take the larger battery capacity.

Greg,
My LAK-17B FES does have two batteries with 14 cells...so it does have the following:

"2 x 14S LiPo, 20 kW continuous power"

The earlier installations had the 12 cell LiPo batteries, but it was upped to 14 cells for the newer 17B installations. Each battery is 58 volts, so when fully charged it starts off at 116 volts. FYI, I did write an article for Soaring on the LAK-17B FES and I am hopeful that it will be published soon.

Thx - Renny

On 9/24/2012 4:23 PM, Renny wrote:


Interesting that the Silent has more battery capacity than the LAK. I

wonder if the LAK can be modified to take the larger battery capacity.

Greg,
My LAK-17B FES does have two batteries with 14 cells...so it does have the following:

"2 x 14S LiPo, 20 kW continuous power"

The earlier installations had the 12 cell LiPo batteries, but it was upped to 14 cells for the newer 17B installations. Each battery is 58 volts, so when fully charged it starts off at 116 volts. FYI, I did write an article for Soaring on the LAK-17B FES and I am hopeful that it will be published soon.

Thx - Renny


Renny:

What type of climb rate, total climb, and range are you seeing?

On Monday, September 24, 2012 5:38:14 PM UTC-6, Greg Arnold wrote:
On 9/24/2012 4:23 PM, Renny wrote:





Interesting that the Silent has more battery capacity than the LAK. I



wonder if the LAK can be modified to take the larger battery capacity.



Greg,

My LAK-17B FES does have two batteries with 14 cells...so it does have the following:



"2 x 14S LiPo, 20 kW continuous power"



The earlier installations had the 12 cell LiPo batteries, but it was upped to 14 cells for the newer 17B installations. Each battery is 58 volts, so when fully charged it starts off at 116 volts. FYI, I did write an article for Soaring on the LAK-17B FES and I am hopeful that it will be published soon.



Thx - Renny





Renny:



What type of climb rate, total climb, and range are you seeing?

I have had limited experience running the FES on the LAK-17B FES as this is my first season using the FES and the ship was also away for several weeks this summer at the WGC in Uvalde. I am also very fortunate to fly out of Moriarty, and with our excellent conditions, I have not had to use it (thus far)out of necessity.

So, I have no data on endurance and range, but in conducting some local (unscientific) testing, I have been able to climb (dry) on a hot day (over 95 deg F on the ground) at over 200 fpm at altitudes of 8,500 to 9,000 feet MSL in the 18m configuration. FYI, the Moriarty airport is at 6,200 feet. Hopefully, you will see additional and more scientific data as Idaflieg testing was conducted in August and results are expected this winter.
Thx - Renny

On 9/24/2012 7:31 PM, Renny wrote:
I have had limited experience running the FES on the LAK-17B FES as
this is my first season using the FES and the ship was also away for
several weeks this summer at the WGC in Uvalde. I am also very
fortunate to fly out of Moriarty, and with our excellent conditions,
I have not had to use it (thus far)out of necessity.

Next year, you should press a little harder, and get some value out the
FES. Then, you will discover it can set you free to explore more than
you imagine now!

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)

On Monday, September 24, 2012 9:04:19 PM UTC-6, Eric Greenwell wrote:
On 9/24/2012 7:31 PM, Renny wrote:

I have had limited experience running the FES on the LAK-17B FES as

this is my first season using the FES and the ship was also away for

several weeks this summer at the WGC in Uvalde. I am also very

fortunate to fly out of Moriarty, and with our excellent conditions,

I have not had to use it (thus far)out of necessity.



Next year, you should press a little harder, and get some value out the

FES. Then, you will discover it can set you free to explore more than

you imagine now!



--

Eric Greenwell - Washington State, USA (change ".netto" to ".us" to

email me)

Eric,
Indeed...That is definitely the plan!
Thx - Renny

On Monday, September 24, 2012 4:23:59 PM UTC-7, Renny wrote:
On Monday, September 24, 2012 4:53:12 PM UTC-6, Greg Arnold wrote: On 9/24/2012 3:39 PM, Renny wrote: Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully,

Renny, so you're running about 170 Amps or so. Your motor and esc need some cooling, so how is that accomplished? And then you must have a way to automatically override throttle if lipos approach 70 to 80% drained?

On Friday, September 28, 2012 6:00:43 PM UTC-6, (unknown) wrote:
On Monday, September 24, 2012 4:23:59 PM UTC-7, Renny wrote:

On Monday, September 24, 2012 4:53:12 PM UTC-6, Greg Arnold wrote: On 9/24/2012 3:39 PM, Renny wrote: Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully,



Renny, so you're running about 170 Amps or so. Your motor and esc need some cooling, so how is that accomplished? And then you must have a way to automatically override throttle if lipos approach 70 to 80% drained?

Motor cooling is handled via a small electric fan forward of the rudder pedals, an air vent in the nose cone that allows outside air to help cool the motor (and the cockpit), and 3 electric fans on the shelf behind the pilot's seat to cool the controller. When the batteries get low, warnings go off on the FCU, and I would then throttle back and turn off the FES. There is no automatic shutdown of the FES which allows the pilot to keep the FES running if there is an emergency situation. Thx - Renny

Dne sobota, 29. september 2012 02:17:14 UTC+2 je oseba Renny napisala:
On Friday, September 28, 2012 6:00:43 PM UTC-6, (unknown) wrote:

On Monday, September 24, 2012 4:23:59 PM UTC-7, Renny wrote:



On Monday, September 24, 2012 4:53:12 PM UTC-6, Greg Arnold wrote: On 9/24/2012 3:39 PM, Renny wrote: Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully,







Renny, so you're running about 170 Amps or so. Your motor and esc need some cooling, so how is that accomplished? And then you must have a way to automatically override throttle if lipos approach 70 to 80% drained?



Motor cooling is handled via a small electric fan forward of the rudder pedals, an air vent in the nose cone that allows outside air to help cool the motor (and the cockpit), and 3 electric fans on the shelf behind the pilot's seat to cool the controller. When the batteries get low, warnings go off on the FCU, and I would then throttle back and turn off the FES. There is no automatic shutdown of the FES which allows the pilot to keep the FES running if there is an emergency situation. Thx - Renny

On our latest instalations, we manage to arrange cooling also without electric fan infront of pedals. Motor itself has bigger centrifugal ventilator at back side!

Regards, Luka

On Saturday, September 29, 2012 1:41:13 AM UTC-5, wrote:
Dne sobota, 29. september 2012 02:17:14 UTC+2 je oseba Renny napisala:

On Friday, September 28, 2012 6:00:43 PM UTC-6, (unknown) wrote:



On Monday, September 24, 2012 4:23:59 PM UTC-7, Renny wrote:







On Monday, September 24, 2012 4:53:12 PM UTC-6, Greg Arnold wrote: On 9/24/2012 3:39 PM, Renny wrote: Here's the URL for a PDF brochure that was handed out at the 2012 Reno Convention on the FES. Hopefully,















Renny, so you're running about 170 Amps or so. Your motor and esc need some cooling, so how is that accomplished? And then you must have a way to automatically override throttle if lipos approach 70 to 80% drained?







Motor cooling is handled via a small electric fan forward of the rudder pedals, an air vent in the nose cone that allows outside air to help cool the motor (and the cockpit), and 3 electric fans on the shelf behind the pilot's seat to cool the controller. When the batteries get low, warnings go off on the FCU, and I would then throttle back and turn off the FES. There is no automatic shutdown of the FES which allows the pilot to keep the FES running if there is an emergency situation. Thx - Renny



On our latest instalations, we manage to arrange cooling also without electric fan infront of pedals. Motor itself has bigger centrifugal ventilator at back side!



Regards, Luka

Luka,

It sounds like a number of incremental changes have been made to the FES system that have not yet been posted to your web site. Could you write a post detailing these changes and perhaps also let us know what's coming in the near future? Thanks,

SLB