Originally Posted by GCrafte

I have a vision of being able to fly all over Europe (and also other continents) in an electric airplane. It will not save you any money if you have to pay landing fees every 100th kilometer, but might do so if you can land on rivers and lakes. There just have to be decent possibilities to recharge the batteries and also some decent solutions for sleep, food and water.

It might work right now if you´re not in a hurry and it might work even better in ten years time if the infrastructure for charging of batteries etc has improved.

Like mentioned above. Trick your wings out with solar panels. Yes solar is not ideal, but it is an option. I heard that solar technology improves by the week, someday, they should be very efficient.

Originally Posted by Axefly

Like mentioned above. Trick your wings out with solar panels. Yes solar is not ideal, but it is an option. I heard that solar technology improves by the week, someday, they should be very efficient.

I imagine that the weight of a solar panel requires more energy to move itself though the air than it generates, especially when the platform like Lazair is not optimal in the glide ratio department. What does Lazair glide? 20:1 on a good day?

There is one aircraft that can propell itself indefinitely by it's own on-board solar panels. I believe NASA debuted this aircraft a few years ago. It's far from being able to carry any significant load, though. To be fair, it's far from looking sturdy enough to withstand a serious gust of wind.

I think the solar panels is meant more in the sense for charging the batteries on the ground while stationary, not powering the plane in the air.

Maybe instead of the wing covering material the solar panels can be implemented, advancements in this technology aims to make solar more flexible, not sure where they're at yet, but it's coming.

All sorts of efficiency breakthroughs have been achieved the past year with solar tech, i'ts a matter of now just waiting for it to be commercially available.

Solar foil is in development:
tech.groups.yahoo.com/group/ETList
www.electrifyingtimes.com

Vriendelijke groeten ;-) Ron

Aaah... There we go.... !

Solar foil? Here is another link: http://blog.cafefoundation.org/?p=6485

You could put the foil on every plane surface: tail, wings, the open tail-boom surfaces, floats, between float struts. All top AND bottom, for reflected light, both surfaces.

Vriendelijke groeten Ron

Hello everyone Gianni from Mantova ( Italy )

I'm a newcomer to the forum

I am a glider pilot , and I have always believed in the electric propulsion , I am the service director of the biggest 5-axis machine tools for the aerospace industry and I am in contact with all the country and company of the sector .

I am also owner of Alisport Silent Club OP ( fixed Konig engine on the Pylon ).

In winter time I want start retrofit to electric my Silent OP, and I need ( if possible some support from the blog )

Silent data are:

130Kg empty weight W/o engine
80Kg pilot weight ( me )
Max LD 34/96KmH ( with winglets )
Actual power is 28HP Konig SD570

According to the information from the Italian manufactor of theSilent and based on the SIlent electro AE1 ( retractable Pylon type ) the characteristics of the very old version are:

Motor type : Not specified
Motor power: 13Kw
Motor rpm: 3.400rpm
Motor weight. 8.5Kg
Battery Weight: 40Kg
Ramp up: 2m/s
take off. <200mt on grass field
Propeller: two blade folding type , 1,92mt diameter , 1300rpm
Electric retractable Pylon


Now , I spend last two night to read all the information posted , because I have to choice the BLDC direct drive and right propeller , now I'm confused because i've to make the decision to use Jobj motor or the 200cc equivalent CA120-80-12 take a look at : http://www.gsmodels.com/en/products0...&fid=100080417

Powered glider don't need power to cruise and after take off reach 600 / 800mt ( 5 to 8 minutes ) the motor must be retract in the fusellage and soaring can start , restarting motor in flight is not safe and depend of height , finally what I want is have power capacity for 20 to 30 minutes ??!!

I've been order to Alisport the electric pylon used in the engine Silent IN because I don't want made experiments so I will use standard retraction system.

Can some ones help me to suggest the right motor BMS , battery and so on ?

Thanks in advance ( and sorry for my English )

Hello Gianni
Concerning a direct drive BLDC outrunner, here is a candidate
Parawatt motor
weight 7.4 kg
Power max 20 kW
Kv 35 rpm/V (star connecting)
contact : www.parawatt.com
Very robust motor (hollow shaft 30mm + excellent ball bearings)
Could be used with MGM Compro HBC series controler
Probably with 13S-14S Lipo you could obtain 1300 rpm on your 1.92m prop
Louis

Hello Louis ,

thanks but this motor is too heavy,
I am in contact with the motor manufactor ot this 200 CC 30Hp
BLDC motor CA 120-80 , for Kv modification if it will no possible
I am thinking ( i not like ) a belt reduction or rewire the motor

For the ESC I am thinking a high quality Kelly OPTO KHB72701 700/350 A

Do you know a good BMS system

Gianni

Originally Posted by Gianni Martini

Hello Louis ,

thanks but this motor is too heavy,
I am in contact with the motor manufactor ot this 200 CC 30Hp
BLDC motor CA 120-80 , for Kv modification if it will no possible
I am thinking ( i not like ) a belt reduction or rewire the motor

For the ESC I am thinking a high quality Kelly OPTO KHB72701 700/350 A

Do you know a good BMS system

Gianni

Your selected motor is same as the hobbyking
Turnigy CA120-70 Brushless Outrunner (100cc eq)

Dave did try it on his Lazair, but eventually decided for a different one

He did also all the rewind stuff

Maybe is better to use a gear that rewind....

Anyhow, if you look in old post you may get some info about the motor and the rewinding actions

Tchuss

E_lm_70

Several big'uns compiled in this thread
www.rcgroups.com/forums/showthread.php?t=1464696

Maybe start a new thread Gianni? We're hijacking this one.

Vriendelijke groeten Ron

Originally Posted by Gianni Martini

Hello Louis ,

Do you know a good BMS system

Gianni

Hello Gianni
My opinion
No BMS when running the motor
Only balance at every charge

It could be very hard to run a 2.7 kg low Kv motor at 12 kW @ 1300 rpm direct drive (1.92 m diam prop)
Good luck

Louis

Hello Tchuss
E_lm_70

My motors is CA 120-80 ( = 200CC )
Dave in Lazair use CA 120-70 ( = 100CC )

Take a look at the Chinese ( not HK ) manufactor :
http://www.gsmodels.com/en/products0...&fid=100080417

Gianni

Ask Astrolight.com to give you information for their custom-built BL inrunner.