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Old Jun 26, 2010, 06:05 AM
HappyGoLucky
chochmah's Avatar
Germany, BW, Ibach
Joined Dec 2009
549 Posts


Well...
There have been almost six months between finishing the build and maiden flight. The Plane is just to big. I had to rent a hanger to get it to the 'flying field'.
Anyways... 3 seconds into the flight the engines shut off and the controls went dead. I suppose me forgetting to extend the radioantenna might have something to do with it...

RC MD-80 Crash on Maiden (0 min 17 sec)



Damage: One of the Main Gears was ripped of and the right Wing needs some serious repairs. At least it flew...
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Old Jun 26, 2010, 06:07 AM
Doushiyou12's Avatar
Joined Feb 2010
1,695 Posts
Oh man sorry to hear about that.
but you are right, she flew.

Best of luck on the next flight. keep us posted.
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Old Jun 26, 2010, 09:52 AM
Registered User
capt's Avatar
Nevada, USA
Joined Sep 2007
1,921 Posts
Well she flew real nice, cut the damage away and glue in new. Tape and/or drywall spackle what can be covered up!
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Old Jun 26, 2010, 07:45 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,656 Posts
Looked good on the takeoff.

Eric B.
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Old Aug 23, 2010, 10:36 PM
Up-Out-&-Gone
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United States, SC, Charleston
Joined Mar 2007
16,338 Posts
Don't worry Boss! at least she flies! now I've gotta get my jets to fly too.
We'll be watching for more!
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Old Jan 02, 2011, 08:09 AM
HappyGoLucky
chochmah's Avatar
Germany, BW, Ibach
Joined Dec 2009
549 Posts
Well... In my Quest for a suitable flying field I attempted to take off from
frozen snow. Unfortunately I could not find a level spot without a
powerline nearby and 5 seconds after takeoff the wind started to blow...

RC MD80 Crash Into Powerline (0 min 49 sec)


The powerline shaved the horizontal stabilizer clean off the plane. 10cm
lower and nothing would have happend.
However, the damage looks worse than it actually is. I will repair it.
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Old Jan 02, 2011, 08:34 AM
Watts Up?
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USA, TX, Arlington
Joined Jun 2006
1,635 Posts
Man this is one of my most loved airliner jet! I hate to see that sorry about it man I looks way under powered. What are u running in it?

Danny
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Old Jan 02, 2011, 11:03 AM
HappyGoLucky
chochmah's Avatar
Germany, BW, Ibach
Joined Dec 2009
549 Posts
I'm using 2 cheap 70mm EDF on 2 3-Cell Batteries. Thrust is a little more
than 900g measured with a kitchenscale.
I wasn't planing to do aerobatics or other fancy stuff so I figured that
would be enough to power a 1.7kg plane.
The ESCs and Motors could take two 4c (or at least that's what the
chinese manufacturer claims) but that would mean additional weight and
with NO Wind the current setup should be enough to fly slow circles,
don't you think?

cheers!
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Old Jan 02, 2011, 03:54 PM
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Joined Apr 2010
42 Posts
do you heave drawnings in scala so i can download?
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Old Jan 02, 2011, 05:04 PM
HappyGoLucky
chochmah's Avatar
Germany, BW, Ibach
Joined Dec 2009
549 Posts
do you heave drawnings in scala so i can download?

Again,
I can email you the 3ds file if you want to. However. I would heavily
recommend to look elsewhere for plans.
Like, for example, this MD80 seems to be really great:
http://www.scale-parkflyer.de/Depron...s-MD80-83.html

Cheers!
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Old Feb 10, 2011, 03:04 PM
Up-Out-&-Gone
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United States, SC, Charleston
Joined Mar 2007
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Hi Chochmah I'm glad to see you got into the air! if it wasn't for that damm wind you wouldn't have crashed when you tried to land. I try and never fly scratch-built jets in winds over 5MPH, try flying in the evening an hour befor sunset. Have you started repairs yet?
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Old Feb 11, 2011, 04:24 PM
HappyGoLucky
chochmah's Avatar
Germany, BW, Ibach
Joined Dec 2009
549 Posts
Quote:
Hi Chochmah I'm glad to see you got into the air! if it wasn't for that damm wind you wouldn't have crashed when you tried to land. I try and never fly scratch-built jets in winds over 5MPH, try flying in the evening an hour before sunset. Have you started repairs yet?
She left quite an impressive crater but the first 30cm of the fuselage worked as a buffer and nothing in the middle and tail of the aircraft was damaged. Apart from the H-Stabilizer obviously.
I have her almost completely repaired and all there is left to do is pretty minor. However, I have to wait for two shipments to replace one of the pushrods that had gotten lost in the snow and a small slice of the depron sheeting.

I'm quite happy with the flight anyway! I build a plane from a clean sheet design and it flies and does so in a controllable fashion. (controlled flight into powerline :-)) Without the strong wind the outcome might have been even better. Who knows. Next time I'll be more picky about the spot and the weather conditions although both are rare commodities where I live.

I hope to see one of your beautiful airliners in the air soon!
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Old Mar 01, 2011, 01:56 PM
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United States, GA, Newnan
Joined Nov 2010
30 Posts
Congratulations on the flight.

As others have mentioned, winds greater than 10km/h can be a problem for lightweight EDF. You have done an impressive job of building and teaching yourself to fly RC. 3S battery power should be adequate for the aircraft.

The motors and possibly the motor/fan combinations are most likely the reason for the low thrust. If you haven't found a reliable source for comparison, Don's RC has a very good site. Don sells some very good motors for small EDF applications. I have two of his 4800kv motors running with 40A ESC's and 3S (11.1v) batteries. Power input is 800W +/- at 100% power. Measured thrust is 1.4 kg (50 oz) after the batteries settle a little. My measurements agree with the data from the charts on Don's web site.

The above are for two of the Eflite 64mm fans (very inexpensive) with 3 blades removed on each rotor. (They come with 6 blade rotors). Essentially, I am running the fan units in the same configuration as the Eflite Airliner, but with Don's 4800 kv motors which are a significant upgrade from the stock motors. The Eflite fans are actually made by "SF" so anywhere you see reference to a 64 mm SF fan, that is what I am running.

Sam
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Old Mar 29, 2011, 02:15 PM
ich bauen groß modell flugzeug
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Joined Dec 2010
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updates ????????????????
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Old Nov 19, 2012, 10:53 AM
Caravan driver
wingnutzster's Avatar
Lanseria airport South Africa
Joined Oct 2005
422 Posts
Hey mate - I came across your build by mistake but am so pleased that I did - "newbie" my ass! Brilliant work mate just brilliant, I was looking for inspiration for a 787 I want to build in depron eventually and I have seen and studied the work of the masters like GGRN, corsair nut, Sparky and the like who are pure artists with depron and foams but when I saw your thread title I thought, "awesome, a newbie so smething more down to earth"...but then I saw you work coming together and realized you were just as talented

Great stuff, sorry to see her in the ground but I really applaud your innovation and design skills and thank you for inspiring my own project which now may actually start before the next millennium.
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