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Graupner Koala-Bell 230-Elektro Skaler > Electro Skaler help
 
 
Darren S
Heliman
Location: Canada

My Posts This: Topic  Forum		hi guys,

i have just begun to assemble my Graupner Heim Electro Skaler mechanics. it has a Compact outrunner motor that is rated at 385 kV. it comes with two different pinion gears. at 28 tooth and 32 tooth. there is a secondary gear drive so the gear ratios work out to 7.5 to 1 and 6.75 to 1 respectfully.

my problem is this: on a 10 S setup the calculated headspeeds will be in the 2200 rpm range. WAY TOO HIGH for scale flying.

my question is this : how do i get around this ? do i use the throttle curve to slow the head down ? i think this will cause overheating issues as brushless motors are designed to run at near 100%.

please shed some light.

thanks, darren
12-22-2007 Over year old.
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tim deakin
Veteran
Location: gloucestershire uk

My Posts This: Topic  Forum		Hi Darren, the 385kv @ 37v gives a motor rpm of 14245.So at a gear ratio of 7.5/1 it should give a head speed of 1899 you could probably slow that down to 1600 and just keep an eye on the temp.But I think that is still a bit to fast for scale and would not suggest slowing it down much more than that on the throttle curve.Are there any other pinions availible? What is the shaft size on the motor?
12-24-2007 Over year old.
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tim deakin
Veteran
Location: gloucestershire uk

My Posts This: Topic  Forum		Hi Darren,I found this on the Vario site.I 'THINK' that these gears are compatable with Graupner.You'll have to buy one and have a look,they are not that expensive in the sceme of things!
http://gb.vario-helicopter.biz/shop...oducts_id=32270

Or the other option is to use a 8s lipo?
12-24-2007 Over year old.
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Darren S
Heliman
Location: Canada

My Posts This: Topic  Forum		hi tim, thanks for the suggestion. the shaft size is 8 mm. i will keep digging.

i thought about 8S but this is a big 90 size bird. the guts are going into the Graupner BO-105 to be painted in the Red Bull colors. i will try your suggestion and set the throttle "curve" to about 85% and watch the temps.

according to the youtube video this is suppose to be a somewhat aerobatic heli. if you haven't seen the video just Google "Red Bull heli" and up it comes. kind of cool. that's my inspiration.

maybe a headspeed of 1600 may not be too bad. for scale landing etc.... maybe i'll just have another flight condition with more expo and less throws.

just a thought. Merry Christmas. thanks again for the suggestion.

darren
12-24-2007 Over year old.
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Sandy Squitieri
Heliman
Location: sarasota

My Posts This: Topic  Forum		you should be able to obtain a much slower headspeed around 1400-1500.
08-30-2008 Over year old.
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skyhunter357
Heliman
Location: NWK CA. USA

My Posts This: Topic  Forum		Darren S,

How is the Bo-105 going im just wondering... I like to build one and before i do i like to get more informtion as much is i can.

Im into scale if you look at my Photo gallery you can see some of my build. but i want to get in to a bit biger scale (Electric)

any info will be great.

I email Graupner for price qute i hope i get respond from them soon before i send my money


Thank you.

skyhunter357
09-17-2008 Over year old.
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CHOPERAMA
Heliman
Location: Bay Area, CA, USA

My Posts This: Topic  Forum		Hi skyhunter357,

You should be able to order Graupner heli stuff from V-East in Florida. http://www.v-eastonline.com/linkroom.html Talk to Sandi, he's very helpfull.

Danny T.
09-23-2008 Over year old.
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skyhunter357
Heliman
Location: NWK CA. USA

My Posts This: Topic  Forum		Thank you!
09-26-2008 Over year old.
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CHOPERAMA
Heliman
Location: Bay Area, CA, USA

My Posts This: Topic  Forum		I finally finished my Skalar conversion from a gasser. I believe the setup I have is quite adequate for my kind of flying. I thought I'd share that. Here's what I used:

AXI motor 4130/16
Jeti Spin 77 Opto ESC
Medusa BEC 5V
2 - Zippy 4S1P cell 3500 20-30C (8 cells)
Motor Pinion - 32 teeth
2nd gear - 50 teeth
bottom metal pinion - 15 teeth
bottom main gear - 60 teeth

The gear ratio I input to the Jeti programmer is 9.6 and set at 1,600 rotor rpm. Flying time is around 5-7 minutes at this time (still breaking in the batteries). ESC & batteries barely warm and motor warm.

Performance is good for loops & rolls.



02-23-2009 06:27 AM
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Graupner Koala-Bell 230-Elektro Skaler > Electro Skaler help
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