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Old Feb 18, 2010, 01:21 PM
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Build Log
Black Witch Foam Speed Plane Development / Build

Specs:
- Code Name: Black Witch (Alpha 1)
- Wingspan: 26"
- Length: 21"
- Weight: 13.24 oz
- Prop: APC 4.2x2 for initial testing (80mph on 3S), APC 3.9x4.1 (82mph on 3S), APC 4.75x4.1 (~100mph on 3S).
- Motor: Turnigy 2836 3700kv, $16.69 HobyKing.
- Battery: Turnigy 4S 1000mha, $13.17 HobbyKing. Rhino 3S 1350mha for initial testing.
- ESC: Turnigy 60A Plush, $37.64 HobbyKing.
- Total Power System Cost: $67.50

Video(s):
- April 3, 2010 1st Flight: Windy, started to rain toward the end, and CG might be off. But it flew. Rhino 3S 1350mha, APC 4.2x2 prop.
- April 18, 2010 2nd Flight: Better CG, better weather conditions. Dopplers around 80mph. Rhino 3S 1350mha, APC 4.2x2 prop.
- April 22, 2010 3rd Flight: Just practice flying. Uneventful.
- April 24, 2010 4th Flight: Nothing special. 82mph on 3S APC 3.9x4.1 prop cut down from 4.1.
- May 1, 2010 5th Flight (No good video): Around 100mph on 3S with a 4.75x4.1 prop. It loses all aileron control at high speed. Crunched the nose a bit on landing so going to retire this one and build a new version.
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Last edited by DreamArcher; Jul 12, 2010 at 07:11 PM.
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Old Feb 21, 2010, 04:25 PM
Quest for Speed!!!
Mike_eee's Avatar
Fremont,CA
Joined Aug 2005
1,190 Posts
nice design..reminds me of the Bugatti airplane...Iam in...
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Old Apr 05, 2010, 06:20 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
12,022 Posts
That looks fast when it's standing still !

One thing though.. With that sharp taper might the stall be a rather nasty? Keep it fast and dont pull too much up elevator would be my advice.

CG should be ok where indicated but by my calc that's about as far back as you would want to go, a fraction forward may be safer for first flight?

Steve
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Last edited by JetPlaneFlyer; Apr 05, 2010 at 06:29 AM.
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Old Apr 17, 2010, 11:05 AM
SagittaXC
Soquel CA.
Joined Feb 2007
161 Posts
Looks Great!!! I wish I could build like that!!! Please Post Video of the maiden flight...This Should Be Good!!! Jack T.
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Old Apr 17, 2010, 12:07 PM
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Thx. I just added the video link to the 1st post.
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Old May 01, 2010, 09:23 PM
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Version Alpha 1 is done. Hard landing. I could repair it but I also need to to take some dimensions from so it would be good to stop now before it's completely destroyed.
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Old May 04, 2010, 02:51 AM
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Internal aileron mock-up for Alpha 2.
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