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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Electrified Vairo Big Airwolf........Awesome.
08-05-2007 05:11 PM  13 years ago
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gtech

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Port Hueneme, CA

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Electrified Vairo Big Airwolf........Awesome.
We finally flew the VBA and it couldn't be any sweeter. Tons of power and run time is around 10 min. Totally Awesome.

NEU BAM 1000
CC 110
2 Trex 600 packs in series

SHUT UP AND FLY!!!!
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08-05-2007 07:38 PM  13 years ago
spiderco

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Henderson, Nevada

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did you make the parts for the conversion yourself? i'm thinking of doing the same thing for my benzin. good job.
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08-07-2007 04:05 AM  13 years ago
gtech

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Port Hueneme, CA

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parts
I had a buddy machine the motor mount and that is all. The pully and belt are off the shelf parts.
SHUT UP AND FLY!!!!
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08-07-2007 05:04 AM  13 years ago
rcadd1ct

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Richardson, Texas

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So what ratio are you using?

Are you using a clutch?

What blades?
-RCA .......... Making Cuisinarts Fly!!!!!!!
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08-07-2007 05:20 AM  13 years ago
rcadd1ct

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Richardson, Texas

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I ran the numbers...

With 1020 K/V on a 12 cell pack, you would have to run a 33:1 gear ratio to get 1218RPM on the head.

You must not be running the normal Rex 600 pack.

Even if you ran on 6 cells a 9:1 ratio is spinning the head 2234 RPM!

Your killing me here.....spill the beans!
-RCA .......... Making Cuisinarts Fly!!!!!!!
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08-07-2007 05:27 AM  13 years ago
chuckhager

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Clovis, CA

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Nice job! Any videos?
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08-07-2007 08:47 PM  13 years ago
kochenderfer

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Orange County, CA

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Details
Hi, I am the proud owner of the helicopter being discussed. Mike builds amazing helicopters. Thanks Mike. Thanks also to Jeff Soucek at Felt Bicycles for designing and machining the custom motor mount.

Details:
NEU 2215/3Y with 8mm Shaft
480 RPM/Volt
5000 watts
5000 / 746 watts per Horsepower = 6.7 Horsepower

Castle Creations 110 amp ESC

2 parallel R/C Model Works UberBEC’s up to 55 volt supply 5 volt output at 4.5 Amps = 9 Amps at 5 volts

12s1P LiPoly – 44.4 volts 4900 mAH
2 EVO 4900 Trex packs in series

Lower Ratio (Belt)
14 tooth pulley (.200 XL)
40 tooth pulley (stock Vario)
= 2.857:1
Upper Gear ratio 5:1
2.857 X 5 = 14.285:1

44.4 volts Nominal X 480 rpm / volt = 21,312 motor RPM
21,312 / 14.285 = 1,491 RPM head speed (usually run 1450)

44.4 volts X 4.9 AH = 217.56 watt hours
217.56 watt hours X 60 = 13,054 watt minutes

The helicopter hovers on about 50 watts per pound
harder flying averages about 65 watts per pound

19.8 LBS X 50 = 990 watts
19.8 LBS X 65 = 1287 watts (10 minutes = 12,870 watt minutes)
I usually fly 9 Min some mellow and some hard
uses about 80% of the pack

The system is wired for a parallel bank of batteries (totaling 4 EVO 4900’s arranged 12s2p 9.8AH @44.4 volts). This will push the flight times to ~15 minutes.
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08-07-2007 08:59 PM  13 years ago
spiderco

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Henderson, Nevada

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thanks for sharing, very useful info. videos please.
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08-08-2007 03:06 AM  13 years ago
rcadd1ct

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Richardson, Texas

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Cool!

Thanks for the info.

What blades are you using?
-RCA .......... Making Cuisinarts Fly!!!!!!!
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08-08-2007 08:48 AM  13 years ago
kochenderfer

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Orange County, CA

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No Clutch - Castle ESC soft start

Vario 815mm reflex blades
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08-08-2007 01:35 PM  13 years ago
rcadd1ct

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Richardson, Texas

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I was told to be careful if you don't use a clutch.

When you hit throttle hold the motor can stop so fast that the momentum of the tail rotor will strip the tail gears.

Awesome project, though.

I have two of them, also. One will be gas, the second will be electric.
-RCA .......... Making Cuisinarts Fly!!!!!!!
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08-08-2007 01:39 PM  13 years ago
rcadd1ct

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Richardson, Texas

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I hope you are using a metal rotorhead. Max RPM for those blade with a Benzin head is like 1270 in the manual.-RCA .......... Making Cuisinarts Fly!!!!!!!
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08-14-2007 02:47 PM  13 years ago
aashu

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scotch plains, NJ

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Just a quick question
I had a buddy machine the motor mount and that is all. The pully and belt are off the shelf parts.
So the Pully (14T) mounts straight on Motor shaft ? Would you have a place to list where these pullies are sold. If i am not asking too much, would you please post a closeup of the mount as well. I am seriously thinking about converting the 212 gasser project to an electric.
Garden State, NJ
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08-14-2007 06:08 PM  13 years ago
kochenderfer

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Orange County, CA

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More detail
Hi All,
I was told to be careful if you don't use a clutch.

When you hit throttle hold the motor can stop so fast that the momentum of the tail rotor will strip the tail gears.
This is not a problem with this motor/speed controller combination if the BRAKE feature of the controller is disabled. The tail rotor takes several seconds to spool down. (very smooth)

More notes:

All metal head - Nickel plated blade grips.

Pully and Belt sources:
sdp-si.com
58 tooth belt
Part #: A 6R 3-058037
https://sdp-si.com/eStore/PartDetai...oupID=213&Qty=0

Pulley - Must be machined to 8mm I.D.
Part #: A 6A 3-14DF03710
https://sdp-si.com/eStore/PartDetai...594&GroupID=217

Custom Mount Pictures:

aashu: Your project looks great! PM me if there is anything else I can do to help.
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Electrified Vairo Big Airwolf........Awesome.
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