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Electric Self Launch System



 
 
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  #11  
Old June 10th 18, 03:10 AM posted to rec.aviation.soaring
2G
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Default Electric Self Launch System

On Friday, June 8, 2018 at 6:30:32 PM UTC-7, Charlie M. (UH & 002 owner/pilot) wrote:
Interesting additional battery chemistry info.....

https://batterybro.com/blogs/18650-w...ally-explained


And here is a lot more detailed info:

http://batteryuniversity.com/learn/a...of_lithium_ion

While the safety of IMR and INR are good, they are not as good as LFP.

Tom
Ads
  #12  
Old June 10th 18, 04:54 AM posted to rec.aviation.soaring
Emir Sherbi
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Default Electric Self Launch System

Yes, they are very reliable and stable. They have very long life cycle. But the energy density is lower. For the same capacity you have to think in more than 60% of weight increase.
  #13  
Old June 11th 18, 01:30 AM posted to rec.aviation.soaring
son_of_flubber
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Default Electric Self Launch System

On Saturday, June 9, 2018 at 11:54:06 PM UTC-4, Emir Sherbi wrote:
Yes, they are very reliable and stable. They have very long life cycle. But the energy density is lower. For the same capacity you have to think in more than 60% of weight increase.


I'd be very happy to have something soon that could sustain 30 minutes of flight at best glide speed. Maybe I'd upgrade to self-launch later when higher energy density batteries become available, but maybe not.

The 'best' is the enemy of the 'good enough'.

Having learned my lesson with Betamax, I'm looking for the VHS of electric propulsion. My glider is 20 years old. There is a limit to how much I want to sink into it.
  #14  
Old June 11th 18, 02:47 AM posted to rec.aviation.soaring
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Default Electric Self Launch System

"I'm looking for the VHS of electric propulsion."
And we wonder why we're decades behind the Europeans...
  #15  
Old June 11th 18, 03:49 AM posted to rec.aviation.soaring
Emir Sherbi
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Default Electric Self Launch System

El domingo, 10 de junio de 2018, 21:30:15 (UTC-3), son_of_flubber escribió:
On Saturday, June 9, 2018 at 11:54:06 PM UTC-4, Emir Sherbi wrote:
Yes, they are very reliable and stable. They have very long life cycle. But the energy density is lower. For the same capacity you have to think in more than 60% of weight increase.


I'd be very happy to have something soon that could sustain 30 minutes of flight at best glide speed. Maybe I'd upgrade to self-launch later when higher energy density batteries become available, but maybe not.

The 'best' is the enemy of the 'good enough'.

Having learned my lesson with Betamax, I'm looking for the VHS of electric propulsion. My glider is 20 years old. There is a limit to how much I want to sink into it.


For our design, having only 30 minutes of sustained flight or selflaunch and having 1 hour of sustained flight is the same technological challenge.
The only thing that changes is the final price.

20 years old is like new, we are about to install it on a 35 years old Pegasus.
  #16  
Old June 11th 18, 05:17 AM posted to rec.aviation.soaring
Charlie Quebec
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Default Electric Self Launch System

Yeh, waiting for an inferior quality system that is more popular is a very US approach.
  #17  
Old June 11th 18, 01:37 PM posted to rec.aviation.soaring
son_of_flubber
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Default Electric Self Launch System

On Sunday, June 10, 2018 at 10:49:51 PM UTC-4, Emir Sherbi wrote:

For the same capacity you have to think in more than 60% of weight increase.


A lower capacity battery pack will be lighter and cheaper. Maybe that would make INR batteries feasible.

  #18  
Old June 11th 18, 03:57 PM posted to rec.aviation.soaring
kinsell
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Default Electric Self Launch System

On 06/11/2018 06:37 AM, son_of_flubber wrote:
On Sunday, June 10, 2018 at 10:49:51 PM UTC-4, Emir Sherbi wrote:

For the same capacity you have to think in more than 60% of weight increase.


A lower capacity battery pack will be lighter and cheaper. Maybe that would make INR batteries feasible.


I think he was talking about LFP batteries not being feasible, due to
low energy density.
  #19  
Old June 11th 18, 04:04 PM posted to rec.aviation.soaring
Emir Sherbi
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Default Electric Self Launch System

El lunes, 11 de junio de 2018, 9:37:44 (UTC-3), son_of_flubber escribió:
On Sunday, June 10, 2018 at 10:49:51 PM UTC-4, Emir Sherbi wrote:

For the same capacity you have to think in more than 60% of weight increase.


A lower capacity battery pack will be lighter and cheaper. Maybe that would make INR batteries feasible.



In your case if you want that capabilities it can be arranged.
We are trying to standardize some components but the battery size and shape can be changed without much issues.

  #20  
Old June 11th 18, 09:55 PM posted to rec.aviation.soaring
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Default Electric Self Launch System

On Friday, June 8, 2018 at 7:30:29 PM UTC-4, son_of_flubber wrote:
On Friday, June 8, 2018 at 4:50:33 PM UTC-4, Emir Sherbi wrote:

INR and IMR, depending on the flight mission.



https://breazy.com/products/samsung-...50-25r-2500mah

INR 18650 2500mah Battery (2 Pack) - Samsung

20 amps of continous discharge, the Samsung 25r has been the go to battery for most vapers because of its authenticity and its transparent rating system. In terms of cell degradation the Samsung 25r has been a reliable source of power.


System provided to me by MGM Compro uses Sony US18650VTC6. Rated capacity 3000mAh. 18 stacks of 28. 57 lb with enclosure and BMS.
Projected performance at 25KW draw is 12 minutes.
FWIW
UH
 




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