Newbe, Foam MD-80, 2.3m long. - Page 2 - RC Groups
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Jan 05, 2010, 11:14 AM
Registered User
cool plane i love them when you finish can you give me pdf plans for it
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Jan 05, 2010, 11:24 AM
Registered User


cool plane when you finish can you give me pdf plans for it i just need to
have her
it is perfect this is what i am looking for.
Jan 06, 2010, 05:19 PM
chochmah's Avatar
Thanks for your kind words.

I'm not sure what PDF-Plans are but you can certainly have the Plans in the format I use (Self constructed 3D Model).

There are however some issues with the design of the Plane most prominent it is way heavier then it would have to be. You could probably sit on the fuselage without breaking anything thats how overbuild it is.

Secondly I would recommend to move the servos from the servo-bay in the wingbox to the rear of the plane because since the fuselage is so long the CG can easily be adjusted by moving the batteries further forward and that way you don't have to build long and complicated transmissions from the servos to the flight-surfaces.

mh, thats all for now, cheers
Jan 06, 2010, 11:52 PM
Flanker Fan
yellow13's Avatar
Please please PLEASE buy at least a USB flight sim and take a "crash" course in flying. It's fun, and with a dozen or so hours stick time you will have a chance at flying your beautiful plane. Believe me, as cool as it is to build a plane, it is even cooler to watch it take to the air and fly... for more than a few seconds. sells a simulator combo for $15. It is money well spent.

It looks like you've got everything on this build right. Good luck with it regardless of how you choose to proceed.

Jan 07, 2010, 06:33 PM
All Around RC Man
Mooshu Beef's Avatar
Wow! This is looking awesome

I also suggest getting a simulator. They are essential to learning quickly and cheap-ly
Jan 08, 2010, 09:10 AM
chochmah's Avatar
After downloading some Demos and reading up on the issue I bought a used copy of RealFlight from EBay. Pivotal for that decision was that the MD80 seems not to be included in any FlightSimulator Package and you can apparently build your own models in RealFlight.

Thanks for the Advice.

Jan 11, 2010, 07:41 AM
chochmah's Avatar
hi Forum. The Postman has rung and I spend a good part of the last night toying around with building and
flying planes in realflight and XPlane. (Still haven't got the Uhu Por glue)

General note: I have turned down Wind and turbulences to speeds below 4mph or 6km/h and I'm using
XPlane and RealFlight. I'm using the X-Plane Demo, I don't know about it but there might be differences to the
Full version.

Some Observations about the MD80-Model from the Simulators
  • If you use to much up elevator during turns the Model will turn itself on it's back.
  • Minimum landind Speed at 3KG weight is approx. 50km/h. Any slower and the Model will tippstall or simply drop.
  • The front Gear has to be mounted significantly lower then the Main Gear otherwise the Model can't be landet.
    (because the AoA is rather small and bouncing of the front wheel will rotate the nose to almost vertical)
  • At 4lbs Thrust the Model is overpowered. 2lbs would be sufficent.
  • Model will slide it's tail out below approx. 80km/h and become instable around the yaw-axis.
  • At turns below aprox. 90km/h Rudder and elevator is needet to hold the direction and height.
  • Plane does not like Angles of Attack higher then approx. 8 degrees. Will stall or drop.
  • Vertical Stabilizer seems to be to small to keep direction at lower speeds. Since the Vertical stabilizer is
    scale I can only assume that the flight dynamics don't scale down well or the real plane has the same issues.
  • The CG is very far back in the RealflightModel and the XPlaneModel. A Couple of centimeters from the rear end of
    the Wing. Is that normal for this kind of a plane?
  • To Land it appears to be best to throttle down while keeping the Attitude with the Elevators.
  • I'm having trouble using the Rudder when the Plane comes right at me. For some reason I fail to reverse
    the directions for the Rudder while reversing for the Ailerons works without thinking about it. That's
    the biggest issue so far since using the Rudder on "Turn to Final" is mandatory to keep the plane from yawing at
    landing speed.

Observations about Simulators (RealFlight and XPlane)
  • The Standard-pattern (takeof/downwind/landing) can easily be flown by a Newbe with most planes in RealFlight.
    I hope that it's that easy in reality too.
  • Creation of Models for RealFlight makes you want to kill your mother. ("~"-Bug cost me 2h)
  • Big differences in Flight Characteristics of the MD80 between RealFlight and XPlane. But since XPlane is actualy
    meant to simulate real planes and I might have done a couple of things wrong in modelling I guess that says nothing
    about the quality of the Sims.
  • Using the Joystick (XPlane) is more intuitive then using the RC-Controler (RealFlight).
  • I have not yet figured out how to make a video from RealFlight and XPlane flights. There's a record-option in RealFlight
    but you can't export to avi/mpg.

If you want to try yourself, here's the RealFlight Model I made. By no means perfect and not a Beauty but it should
resemble the Real MD80-Model quite well. If you have observations/suggestions please share.

Jan 11, 2010, 04:00 PM
chochmah's Avatar
Sorry, I forgot to Link the Model:

RealFlight MD80: MD80_EA.RFX

Jan 12, 2010, 01:58 PM
Impossible? Hah!
KreAture's Avatar
Beautiful work so far.
Just remember: if you stuff it, glue it together and repeat.
There is no crash that is unrecoverable.

That being said, I think you'll be fine
Jan 12, 2010, 06:08 PM
Aka: Tom Jenkins
ApexAero's Avatar
Think about some in line caps on the extended power feed from the front they will save your ESC's, someone else's better knowledge of the theory could offer better info than I.
Jan 13, 2010, 09:17 PM
Registered User
capt's Avatar
Workshop, Foam, Beer, check I'm onboard!
Jan 17, 2010, 07:40 AM
chochmah's Avatar
Since I currently can't reach the place where I'm building the Airplane due to bad weather I went ahead and carved the nose- and tailsection right here at my Desk and out of glued-together styrofoamsheets. It does not really resemble the look of the MD80 because I could not get hold of any good schematic drawing and I lack the artistic ability that is needed to sculpture complex bodies but I'll stick with what I made.
Does anybody know how to smoothen the surface of the styrofoam after sanding it and how to fill gaps? I would appreciate a Link to some sort of Tutorial or Instructional Video etc.

Hope the Weather gets better soon. Cheers
Jan 17, 2010, 01:21 PM ..
j3tman's Avatar
i like it
Jan 17, 2010, 08:14 PM
Registered User
capt's Avatar
how to fill gaps
Light weight Spackle works great for gap & crack filling.
Jan 18, 2010, 04:50 PM
chochmah's Avatar
Thanks, I'll try Spackle for the Nose/Tail-Section.
Meanwhile I'm doing my homework every evening:

Scratchbuilt RC MD-80 in the Simulator (0 min 40 sec)

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