I like this design....Embraer to build glider-like 9-seater all electric........contra-rotating props....... looks nicely styled......
Embraer has unveiled a family of concept aircraft the company says it is exploring to help the industry achieve its goal of net zero carbon emissions by 2050. The details of the Energia family, the latest in the company’s Sustainability in Action initiative, were announced Monday from Embraer’s...www.flyingmag.com
Thank you very much for your input, Martin.From my point of view is Mr. Geiger system designed more for amateur builders. MGM is focused more on professional users and solutions designed for specific projects (like propulsion for GP gliders etc.).
Geiger systems are like LEGO
You can buy only 2 battery packs and later connect more (up to 8 if i remember well).
Is designed like "plug and play" so you decide what power do you need and systems comes with wiring and all parts you need.
Positive is that Geiger battery pack size is unified. However this can be a problem if you need special shape of batery pack (we had that problem because we have battery cells in wings and fuselage).
"25 hp Moni motorglider"
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First of all - how much weight you have available for propulsion system installation?
(MTOM - EW - pilot weight - actual engine installation weight)
And... what is power you need for horizontal flight?
I had problems with motor temperature - max. power was 60 kW, but max. cont. power was 30 kW. Not a problem for flying, however is really good to pay attention to cooling system.
Battery capacity is important to precede problems with battery overheating.
With controllers I had no problems.
Solution based on ZERO is not that bad because of price and whole system package (motor, battery pack, controller, charger).
However I agree that shoudl be not from "wrecked" motorcycle.
And... I would also think about this propulsion system available in US:
challenger HKS, 700/E, 4 cycle power, 4 stroke power, challenger 4 stroke engine, HKS conversionwww.uflyit.comShown and flown at this year’s Sun ‘n Fun and AirVenture, the Aerolite 103 is a well-tested, best-selling ultralight that in FAA Part 103 form is a true ultralight. As an electric aircraft, it’s heavier and faster than accepted ultralight standards but no less a competent flyer registered in the...sustainableskies.org
You are working with nearly same numbers as numbers of propulsion installed in SagittaThank you very much for your input, Martin.
I'll be in touch with Geiger soon.
My own version of the Moni with extended span will need only about 7 hp (5 kW) shaft power for economy cruise level flight, depending on which prop is selected.
For reasonable climb rate plus margin, 25 kW peak/15 kW continuous would probably be about right.
Firewall forward mass allocated for batteries, controller, motor, and prop is approximately 80 pounds to get the CG right.
More battery mass can be accommodated by locating some of the pack further aft ( inside the cockpit) though I'd prefer to keep it all forward of the firewall.
I do like the electric setup on the Aerolite 103 .. it seems perfect for that aircraft, though it does seem a bit on the heavy and draggy side for a motorglider.