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Toggle switch for small aircraft charging system in case of failure
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SkyMaster:

--- Quote from: NiHaoMike on April 21, 2020, 12:06:10 am ---
(What's the ratio of cruising power to takeoff power?)

--- End quote ---

For low power aircraft (typically all piston powered light aircraft) the take off power is 100% power, cruise is 75% power, climb is 100% power.

If the aircraft is climbing from sea level to 10,000 ft, at a vertical speed of 500 ft per minute; this will be 100% power for 20 minutes.

 :)
richard.cs:

--- Quote from: SkyMaster on April 21, 2020, 04:12:35 pm ---For low power aircraft (typically all piston powered light aircraft) the take off power is 100% power, cruise is 75% power, climb is 100% power.

If the aircraft is climbing from sea level to 10,000 ft, at a vertical speed of 500 ft per minute; this will be 100% power for 20 minutes.

 :)

--- End quote ---

So such a system would allow a 1/3 smaller engine (ignoring charging power). I suspect that it's not a sufficient saving on engine mass to balance out the motor and batteries. Might be better off using a much smaller motor and battery as an electric supercharger. Hmmm, I wonder if an RC ducted fan would be good in that role.
ITman496:
I don't think an EDF can do that, as they don't have tremendously good static pressure, which is the one key trait a super/turbo charger needs.  They do have viable electric turbos, however!  They are essentially the compressor turbine and housing of a turbo, driven by a very powerful BLDC.  Can make a couple PSI boost on the average engine, enough to add a kick.

Pardon the uh.. american-ness, but this does show what it can do.



On another note, I got the TVS diodes in today! I'm gonna put them into the aircraft now.
ITman496:




richard.cs:
Looks good  :-+

And good point about EDF suitability, that was a silly suggestion.
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