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Discussion in 'Electric Propulsion' started by rv6ejguy, Jun 27, 2019.
They had a great time flying this sweet-heart of a plane!
Yes. Interesting to see the power needed to fly under different flight conditions. Also, you just hear the prop and airframe noise on the fly by. Pretty cool.
WOW! Gorgeous! I looked up the MTOW for the Alpha (could only find the petrol version's data but one would hope they're pretty similar) and it gave a figure of 550kg. I'll assume ~500kg or less for this flight, as neither occupant looked that heavily built - but hauling half a tonne around at 80+kts, for only 20KW, is very nice as far as I can tell! Heck, by that, there are electric paramotor setups out there that could keep this plane in the air, if you ran them hot.
Notice the large span, high aspect ratio wing.
Is that a subtle hint?
Are you saying that I'm FAT???
Looks like it just crashed into a lake in Norway.
Hmm. A giant battery and a few people fall some water. That sounds bad
Just like ICE, there's multiple points of failure. Burned up motor controller, bad rheostat on the throttle, high temp protection circuit, bolt could have vibrated off a lug... There's going to be plenty of these kinds of issues as people figure out what works.
There were a hell of a lot more ICE involved crashes early in development.
It’s actually surprising there have been nearly no electric crashes so far.
I also agree... This is part of development. Thank god it was no fatal accident.
At the beginning we also had to solve problems - look here (time 5:20 - 6:30)
But you have to start again
Don´t expect that electric propulsion in aviation is simple like in RC models. When you cross power of 15-20 kW you have to face new challenges. However I still beleive that for small and sport aviation is electric propulsion good solution.
I could envision cattle ranchers in the outback using these instead of helecopters. Provide an adequate solar charging station and save a bunch.
Also may be useful for people to commute to work up to about 70 miles providing there is a way to recharge.
For outback use and super stol use here is the machine to use when chasing cattle, inspection etc.
A local design from a very talented guy who makes his own designs- farmers love him.
Another one of his designs.
Sorry for thread drift, and not electric.
The hornet is obviously a direct copy of a Zenith CH701.
My calculations of using this airframe for electric power is favorable.
Thanks for the vids
Hornet isn't direct copy of CH701. It has different fuselage and also wing isn't same.
In fact, actually electric flight isn't ecological as battery production and recycling is pretty dirty, low capacity, lifetime, power and pricey.
You are probably correct on the Zenith copy now that I looked at the specs, however the wing clearly resembles one.
As far as the ecological impacts, that is debatable.
As for the low power density, I stand by statement that the mission capability could meet some people's requirement while allowing solar or wind generation to keep costs down. Using fast charging from stored power someone could achieve at least 4 short flights a day without breaking the bank.
I very much admire the aircraft being produced, and those that have been produced in Australia, and admire the spirit of those doing it.
I am willing to let the end user determine their suitability.
The AAK aircraft have no relation to anything done with a Zenith.
The wings shape and looks far predate a Zenith by at least 40 years and are nothing new at all.
Ole Hartmann designs all his machines from scratch to suit the utility of the intended users. Hence tough as nails, internal steel cage, trailing link gear and even a shock on the tail wheel if desired. Also have standard hardpoints on the wings and under cockpit for carrying big things.
But I do not expect he envisages the hardpoints for military use.
He designs primarily for outback operations on farms and massive cattle stations, most of his machines end up been used daily and are the lifeblood of farm operations. Some are doing 1ooo plus hrs a year, not show ponys but workhorses.
Also excel at observation, search and rescue etc.
A Zenith is not in the same league, the Hornet could be described as a flying tank for farms.
Sorry again for my earlier reply.
Do you see that something like this with a 30 to 60 minute flight duration as being useful?
Not useful at all unless you have a huge heavy pack. For outback use you need range.
For 30- 60 mins max, then it will have the ability to carry the batteries no problem and maybe a passenger for shorter flights. It would make a good tow plane for getting gliders up as they all come with a glider tow option.
Fast charge for next tow if a big climb or after multiple lower climbs.
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