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Old Jan 08, 2009, 08:07 PM
Globemaster Maiden Time
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Melbourne
Joined Jun 2007
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Sound and Taxi test

http://www.youtube.com/watch?v=B82YZATf7dU
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Old Jan 10, 2009, 02:29 AM
Globemaster Maiden Time
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Melbourne
Joined Jun 2007
1,058 Posts
No luck with the airliner 747 today, 3 attempts couldn't get off the ground.
1. Not enough surface area on the elevators.
2. Not enough smooth take off surface.
3. Nose retract failed on all 3 attempts.

Back to the drawing board. It would have taken off eventually if the retracts didn't fail.

It has flown before as a prop pusher.
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Old Jan 10, 2009, 02:18 PM
Real name's Teja :)
teha99's Avatar
USA, NJ, East Brunswick
Joined May 2008
1,388 Posts
maybe it would start flying if you launch it off of a moving car...?
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Old Jan 14, 2009, 03:56 AM
Globemaster Maiden Time
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Melbourne
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She just took off but I must have paniced and sat her down at which point the retracts fails
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Old Jan 17, 2009, 01:27 AM
Globemaster Maiden Time
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Melbourne
Joined Jun 2007
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She flew today, I will post video once the guys filming give it to me. She flew fantastic and true to scale!!! Loved it, even though my knees were shaking

Now it's time to make her look nice with a paint job and finish off the minor details.
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Last edited by KoziFlyer; Jan 17, 2009 at 05:55 PM.
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Old Jan 19, 2009, 04:44 AM
Globemaster Maiden Time
KoziFlyer's Avatar
Melbourne
Joined Jun 2007
1,058 Posts
Here is the video.

Maiden of RC 747 Scratch Built Plane (3 min 9 sec)
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Old Jan 19, 2009, 04:52 AM
Depron Panda
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Ramat Hasharon, Israel
Joined Feb 2006
80 Posts
Very nice indeed.
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Old Jan 19, 2009, 03:05 PM
Go FASST or go home...
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Bergen, Norway
Joined Nov 2002
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Well done!

Ben_E
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Old Jan 19, 2009, 03:10 PM
GorillaGlue, Tape...I'm good
SillyCornValley, CA, USA
Joined Jun 2007
216 Posts
Quote:
Originally Posted by KoziFlyer
She flew today, I will post video once the guys filming give it to me. She flew fantastic and true to scale!!! Loved it, even though my knees were shaking

Now it's time to make her look nice with a paint job and finish off the minor details.
Great job! She looks geat. Is it still running on just 2 fans, or are all 4 running?

BTW, what is the AUW with the fan setup and what size are the fans?
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Old Jan 19, 2009, 05:32 PM
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Joined Dec 2008
59 Posts
can any one suggest a cheap transmitter for the 747

i am in the middle of building the model but i took the f4 formers out and replaced with f5 so it is like a 737 as it is first build up to now all is good
pics here http://www.rcgroups.com/forums/showthread.php?t=986274

and will all these work together if i buy them and if i have 2 motors and 2 speed controllers can they work of 1 channel on the reciever

here is what i am planning on buying

www.hobbycity.com
18 amp esc -speed controller
edf fan unit 6 blade 55mm-fan
hxt 2435 4400kv brushless inrunner -motor
hex tronik d9 gen 2 350 mah lipo 3s pack - battery
vtso5b servo (x4) - servo

www.brchobbies.co.uk
sfm retractable gear and steerable nose wheel
gws e2 hinges
jp lipo charger 1-3 s
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Old Jan 19, 2009, 06:16 PM
Registered User
Christchurch, New Zealand
Joined Jun 2006
6,794 Posts
So, the only thing I see wrong there is the battery; it's not nearly big enough to handle anything close to 18A. I don't know what that motor will draw with that fan, but 18A would be a 50C discharge rate. Firstly, the battery won't handle it, and secondly, even if it did, it's only going to run for a little over a minute. Something like 1500mAh is more like it.

You can run two ESCs off one channel, use a y-lead and remove the middle pin from one ESC lead (so the BECs don't argue with each other).
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Old Jan 20, 2009, 01:37 AM
Globemaster Maiden Time
KoziFlyer's Avatar
Melbourne
Joined Jun 2007
1,058 Posts
Quote:
Originally Posted by I_Gotts_Ta_Fly
Great job! She looks geat. Is it still running on just 2 fans, or are all 4 running?

BTW, what is the AUW with the fan setup and what size are the fans?
Here's a slow mo' of take off from another camera view by Ron, aka Wobby.

http://www.rcgroups.com/forums/showa...mentid=2290775

AUW: 2.5kg
FANs: 64mm GWS 6 blade (x2)
ESC: Extreme Power 60Amps (x2)
Battery: Extreme Power 4000mAh, 4 Cell (3.5 minutes flight max, need bigger pack)
Thrust per fan = 1.1 kg each.
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Old Jan 20, 2009, 01:42 AM
Globemaster Maiden Time
KoziFlyer's Avatar
Melbourne
Joined Jun 2007
1,058 Posts
Quote:
Originally Posted by acambo123
i am in the middle of building the model but i took the f4 formers out and replaced with f5 so it is like a 737 as it is first build up to now all is good
pics here http://www.rcgroups.com/forums/showthread.php?t=986274

and will all these work together if i buy them and if i have 2 motors and 2 speed controllers can they work of 1 channel on the reciever

here is what i am planning on buying

www.hobbycity.com
18 amp esc -speed controller
edf fan unit 6 blade 55mm-fan
hxt 2435 4400kv brushless inrunner -motor
hex tronik d9 gen 2 350 mah lipo 3s pack - battery
vtso5b servo (x4) - servo

www.brchobbies.co.uk
sfm retractable gear and steerable nose wheel
gws e2 hinges
jp lipo charger 1-3 s

May not be enough. What do you expect the all up weight to be?

If its around 2-3kg you will need whats listed below.

Battery is too small - 4000maH 4 Cell (and 4-6 cell charger) minimum to get 3.5 minutes flight
Motors ok - i used 4000kv
18a ESC (will fry instantly) - too small - get a 60A for a little extra cost, you need 2
HXT 9 gram servos are the best the blue cheap ones from hobbycity.
Fans good: go the 64mm for little extra cost
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Last edited by KoziFlyer; Jan 20, 2009 at 01:57 AM.
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Old Jan 20, 2009, 11:30 AM
Registered User
Joined Dec 2008
59 Posts
would you recomend any y leads and wer to get them

i need one but i dont no what they llook like
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Old Jan 20, 2009, 02:10 PM
Always optimistic
foxflier's Avatar
North of Houston, TX
Joined Feb 2005
288 Posts
Quote:
Originally Posted by KoziFlyer
Here are the Motors. I have changed from rear prop to 2x Ducted Fans powered and 2x DF unpowered.
Hey Kozi,

Great job!

You know those fans that aren't running provide drag especially if those impellers are windmilling. You could either power 'em up or install some fake feathered impellers...

Ted
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