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The future of the helicopter is electric.

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The future of the helicopter is electric.

Old 29th Mar 2021, 10:50
  #181 (permalink)  
 
Join Date: Feb 2012
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Originally Posted by Reely340 View Post
BUT if the tech guys manage to get Lithium Borohydride "to fly" (pun intended) the world (of piston helos) would change:
A LiBH4 battery packs the energy both tighter (volume) AND lighter (weigth) than any of our beloved liquid gasolines.
let me add that above is true IF and only if that new Lithium Borohydride Battery will provide its massive energy in a fast fashion.
If fully darining it take 3 years, it might be great in sattelites but not in high yield applications like helos.
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Old 29th Mar 2021, 12:42
  #182 (permalink)  
 
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I must admit I remain very impressed with Oskar's ingenuity, besides the battery limitations I'm sure his rig lets him explore other ideas such as his quad electric tail rotors. If I were ever crazy enough to undertake a similar venture I would relocate the tail rotors to both sides like elephant ears but on shorter booms. This will then allow both sides to provide anti-torque in the hover and when moving forward one side can be reversed so that both sides can provide a propelling force.

Thanks for the graph Reely340, it really does put batteries in perspective (and also wastage of energy by liquid fuels).
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Old 29th Mar 2021, 13:08
  #183 (permalink)  
 
Join Date: May 2016
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This Technology is also very promising for hydrogen powered electric aircraft:
https://www.fraunhofer.de/en/press/r...-scooters.html
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Old 29th Mar 2021, 13:10
  #184 (permalink)  
 
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Originally Posted by cattletruck View Post
If I were ever crazy enough to undertake a similar venture I would relocate the tail rotors to both sides like elephant ears but on shorter booms. This will then allow both sides to provide anti-torque in the hover and when moving forward one side can be reversed so that both sides can provide a propelling force..
The Airbus Racer configuration?
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Old 29th Mar 2021, 14:29
  #185 (permalink)  
MLH
 
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Originally Posted by MeddlMoe View Post
The Airbus Racer configuration?
Or a coaxial design.
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Old 2nd Apr 2021, 20:33
  #186 (permalink)  
 
Join Date: Sep 2016
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Originally Posted by cattletruck View Post
I must admit I remain very impressed with Oskar's ingenuity, besides the battery limitations I'm sure his rig lets him explore other ideas such as his quad electric tail rotors. If I were ever crazy enough to undertake a similar venture I would relocate the tail rotors to both sides like elephant ears but on shorter booms. This will then allow both sides to provide anti-torque in the hover and when moving forward one side can be reversed so that both sides can provide a propelling force.

Thanks for the graph Reely340, it really does put batteries in perspective (and also wastage of energy by liquid fuels).
Yeah this is what I proposed above.
Don't see why it couldn't work.
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Old 3rd Apr 2021, 07:05
  #187 (permalink)  
 
Join Date: Feb 2005
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A three phase electric motor weighs close to 3000 lbs and draws about 300 amps.I would think a battery to supply that amount of energy for a small amount of time would weigh about the same..Have'nt started on the airframe yet
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Old 3rd Apr 2021, 09:51
  #188 (permalink)  
 
Join Date: Feb 2008
Location: Manitoba Canada
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Originally Posted by cattletruck View Post
I must admit I remain very impressed with Oskar's ingenuity, besides the battery limitations I'm sure his rig lets him explore other ideas such as his quad electric tail rotors. If I were ever crazy enough to undertake a similar venture I would relocate the tail rotors to both sides like elephant ears but on shorter booms. This will then allow both sides to provide anti-torque in the hover and when moving forward one side can be reversed so that both sides can provide a propelling force.

Thanks for the graph Reely340, it really does put batteries in perspective (and also wastage of energy by liquid fuels).
As far as the tail rotor , Oskar said he tested many different methods ... and was somewhat surprised that multiple independent small rotors were the best .

It is agreed that the current test model looks like a thorn bush on the end of the boom but I expect he will tidy it up some day ..... on that note it appears that Bell Helicopters came to the same conclusion with their multiple electric tail rotor prototype.

Another thing to keep in mind is that Tesla cars took a giant leap forward with their motors .... something like permanent magnets on the armature itself which makes tremendous torque ... I am not an expert on electrics but have the proper info on a different computer and will post it later.

Oskar is not using a Tesla motor but found something unique for his main power ... later I will post it also.

======================
EDIT to add pictures

.



Last edited by Arnie Madsen; 3rd Apr 2021 at 10:02.
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Old 3rd Apr 2021, 22:24
  #189 (permalink)  
CTR
 
Join Date: Oct 2007
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Looks like Bell covered the open rotor “thorn bush” configuration also in their patent for the electric tail rotor.

Great minds think alike.


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