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Old Jun 03, 2006, 02:08 PM
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Bowman JW60-VE2, Electric Twin Conversion

I converted a Bowman Hobbies JW 60 <http://www.bowmanshobbies.com/jw.html> into an electric twin motor V-tail.

Here are the specifications:

Model Name: Bowman JW60-VE2
Weight w/o Bat: 45 oz (includes 2 oz lead sinker in nose)
Battery: LiPoly ElectriFly Power Series 2100mAh 7.4V, x 2 packs in parallel
Battery Pack Weight: 4.5oz each pack, 9oz total both packs
RTF Weight: 54oz
Speed Controller: Castles Creations Phoenix 25A x2, both soft cutoff mode
Motors: Mega ACn 16/15/4 x2
Gear Ratio: none, not geared
Props: APC 7x5 E-Props 2x
Receiver: Hitec HAS-3MB AM 3ch, Ch 38
Servos: Dymond HES-588 MG x2 (HS-85), Elevons, no V-tail servos yet
Wing Span: 60in
Wing Area:570sq-in
Wing Loading: 13.6oz/sq-ft
Battery Compartment Dimensions: 5.6"lx1.6"wx2.2"h
Full Throttle: 40.2A 276W total, 6.87V 11100RPM

[IMG]JW60-VE2[/IMG]

I will attach some more photos in the next post.

Donald Kimball
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Old Jun 03, 2006, 02:13 PM
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San Diego, CA
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JW60-VE2 Build Photos

The fueselage and tail section was created by cutting and gooping together 2 JW60 fueselage sets.

Donald Kimball
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Old Jun 03, 2006, 02:25 PM
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JW60-VE2 Build Photos Part 2

My 1st version used the TowerPro BMC 15A ESCs with a pair of Hyperion Velocity Lites 7.4V 2100mAh 18C LiPoly packs. The current was too high for these ESCs and the motor cuttoff was too abrupt. One motor with cut-off, and the other would speed up, causing a yaw spin in flight. The batteries were OK, but the Electifly Power Series 7.4V 2100mAh 20C LiPoly pack pair ran cooler.

Donald Kimball
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Old Jun 03, 2006, 02:32 PM
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JW60-VE2 Build & Finish Photos Part 3

I completely covered the fuselage and wing with fiberglass strapping tape. This allows me to land on rocks and cactus without taking chunks out of the aircraft.

Donald Kimball
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Old Jun 03, 2006, 02:48 PM
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San Diego, CA
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JW60-VE2 Finish Photos Part 4

I enlarged the battery to compartment accomodate the larger ElectriFly Power Series 2100mAh 7.4V pair of LiPoly battery packs. I also changed to a pair of Castle Creations Phoenix 25A ESCs. The soft cut-off feature is very useful for twins. In this way, the throttle is slowly reduced on both motors at about the same time. The spinners were also enlarged from 30mm diameter Dymond Model Sports spinners to 40mm diameter Dymond Model Sport Spinners. This change resulted in quiter operation.

The 2 Deans Ultra-Plugs are wired in parallel to the ESCs and pair of batteries. I am not using individual battery packs on each motor.

Donald Kimball
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Old Jun 03, 2006, 02:55 PM
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San Diego, CA
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JW60-VE2 Flight Reports

I have flown this model 6 times. The aircraft is pitch sensitive, and can rapidly change directions in flight. Very easy to launch with the propellers in the front away from my hand. Unforntunately I do not have ulimited vertical. At full throttle it flops around at the top of verticle like a fish. It can fly in a very slow inverted stall that looks kind of strange. Sorry, I do not have a video. The aircraft was punctured but otherwise undamaged in a full throttle tumble into a cactus. oops!

Donald Kimball
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