pictsidhe
Well-Known Member
Unfortunately, not everyone has him on ignore. So somebody will always bite.
Anyone remember that other Finnish nutjob who kept spamming threads about his pedal powered airliners?
Why battery-powered aircraft will never have significant range
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Anyone remember that other Finnish nutjob who kept spamming threads about his pedal powered airliners?
Speedboat100
Banned
That was a good one Pitchside. Dan knows this will blow everyone's mind.
Speedboat100
Banned
It is ready...the initial lay out !
Name is ROADRUNNER !
After the legendary finnish rock band Hurriganes:
Name is ROADRUNNER !
After the legendary finnish rock band Hurriganes:
Motorgliderpilot
New Member
- Joined
- Dec 2, 2020
- Messages
- 4
Topspeed and Speedboat are the very same guy, as you can see from his signature link
Speedboat100
Banned
Of course...everyone knows it...even pitchside.
John.Roo
Well-Known Member
This interesting post from blane.c can help you
Perhaps you will be amused.
For figuring stall speed of part 103 ultra light aircraft, scroll down "Just past" pg16 and you will find appendix (1) and 3pg below that is appendix (2) which is, Determining power-off stall speed of ultralights.
What do you think about "e-soaring"?
I really can´t get out from my head the idea of simple and light single seater. So that you understand me well - I still want to share the beauty of flying so I enjoy flying with my wife with my sons and with friends and with other pilots etc .... However... oneseater idea is still in my mind...
www.homebuiltairplanes.com
Speedboat100
Banned
This interesting post from blane.c can help you
Perhaps you will be amused.
For figuring stall speed of part 103 ultra light aircraft, scroll down "Just past" pg16 and you will find appendix (1) and 3pg below that is appendix (2) which is, Determining power-off stall speed of ultralights.
What do you think about "e-soaring"?
I really can´t get out from my head the idea of simple and light single seater. So that you understand me well - I still want to share the beauty of flying so I enjoy flying with my wife with my sons and with friends and with other pilots etc .... However... oneseater idea is still in my mind...www.homebuiltairplanes.com
I have gone through the Part 103 requirements.
My plane at the lowest weight with just 8 -10 kg batteries will have very slow stall speed and cannot fly very fast if the motors are small enough. Increasing the batteries onboard and having bigger engines will considerably speed up the machine....becoming an experimental.
John.Roo
Well-Known Member
8-10 kg of batteries?
It means capacity of +-2 kWh.
For TakeOff power 14 kW you have discharge rate of 7C.
It is your project just...
I really recommend you to make several ground tests with max. power and power necessary for level flight with detailed measurement of temp. of battery cells and motors. It will give you some impression how long you can use max. and cont. power.
It means capacity of +-2 kWh.
For TakeOff power 14 kW you have discharge rate of 7C.
It is your project just...
I really recommend you to make several ground tests with max. power and power necessary for level flight with detailed measurement of temp. of battery cells and motors. It will give you some impression how long you can use max. and cont. power.
Speedboat100
Banned
Part 103 plane needs only 8-12 KW for take off. Plane works as a plat form for several FAI records...with more batteries and 14 KW of max power.
----
There are several aims with this:
1. Finnish 70 kg motorglider...that is first intented...with 8-10 kg of batteries.
2. Part 103...that can have flaps and more batteries as it is 115 kg limit ( 5 gallons worth ? ).
3. Certified ultra under 300 kg.
Plane has very low stall speed at 70 kg weight...so it fits PART 103 as such.
I hope this clear the subject.
Last edited:
John.Roo
Well-Known Member
I don´t see problem with propulsion power.
Few weeks ago I was personally flight testing light plane with MTOM arround 300 kg with 15 kW propulsion system and battery had capacity of 6 kWh. Nice experience
So 12 kW is OK. I just prefer higher capacity of batteries.
Ideally 1 C of less for level flight and 2-3 C for TakeOff.
Few weeks ago I was personally flight testing light plane with MTOM arround 300 kg with 15 kW propulsion system and battery had capacity of 6 kWh. Nice experience
So 12 kW is OK. I just prefer higher capacity of batteries.
Ideally 1 C of less for level flight and 2-3 C for TakeOff.
henryk
Well-Known Member
=some pictures ?Few weeks ago I was personally flight testing light plane with MTOM arround 300 kg with 15 kW propulsion system and battery had capacity of 6 kWh. Nice experience
Speedboat100
Banned
Yes we want some pictures !
? Where is the rest of it?
That was informative.
Smoke in the cockpit could have been more of an issue than the actual fire. Compromised breathing and eyesight could acerbate an already difficult problem leading to poor judgement.
John.Roo
Well-Known Member
OK, OK
I will make some photos and videos.
John.Roo
Well-Known Member
Thanks! Really interesting report.
Good reason to keep batteries away from cockpit (in the wings or in the front of firewall).
And this is also interesting reading:
The glider manufacturer’s Flight manual and Maintenance manual provides direction on battery charging. This includes two cautions:
CAUTION! DURING THE PERIODS OF NOT USING THE AIRCRAFT, IT IS REQUIRED TO PERFORM A KEEP-ALIVE (STORAGE) CHARGE ONCE EVERY 30 DAYS. TO DO SO, CONNECT THE CHARGER AND SELECT ‘REST CHARGE’ MODE, THAN WAIT UNTIL COMPLETED. THIS WILL REFRESH THE BATTERIES AND KEEP THE SYSTEM IN A HEALTHY STATE. ALSO, AFTER A PERIOD OF NO-FLYING ACTIVITY, PERFORM A FILLUP CHARGE 24 HOURS BEFORE THE ACTUAL FLIGHT.
CAUTION! AFTER PERFORMING A FULL CHARGE, DO NOT KEEP THE BATTERY AT A VOLTAGE OVER 260 VOLTS FOR MORE THAN 5 DAYS. EITHER PERFORM A FLIGHT OR RUN THE MOTOR TO DISCHARGE THE BATTERY TO THE RECOMMENDED 240-260 VOLTS FOR STORAGE.
Speedboat100
Banned
I agree. I decided to keep the batteries outside. I even discussed with my structural engineer about possibility to jettison the batteries in case of an emergency. It would be rather easy to do in my design.
John.Roo
Well-Known Member
I don´t know if CAA/LAA/FAA... would allow to jettison batteries + unless you have bateries exactly in airplane CG you should consider CG change after "drop out".
