Author Topic: Multiplex Cortina (Read 1654 times)

SpringHead · « **on:** January 11, 2012, 15:26:42 PM »

I have just got my hands on an unstarted Multiplex Cortina in mint condition.
This is my first build thread and first 'quality' plane apart from a moldey (Acacia 2), any opnions and advice will be appreciated.
I want to post the instructions bu need to find a way of getting the scans down to 450KB.
In the meantime here are the parts

satinet · « **Reply #1 on:** January 11, 2012, 15:31:48 PM »

that the one off ebay?

SpringHead · « **Reply #2 on:** January 11, 2012, 15:56:58 PM »

Yes it is, the gent I bought it off packed it very well the only damage was to the canopy.

satinet · « **Reply #3 on:** January 11, 2012, 16:30:56 PM »

Yes I saw that on ebay. I reckon you have got a pretty rare model there.

Is 4 elevons and 2 airbrakes? or 2 and 2?

It will be interesting to see this one build and fly.

swarrans · « **Reply #4 on:** January 11, 2012, 18:42:45 PM »

I reckon that's going to be gorgeous Martin..

Si

jiberjaber · « **Reply #5 on:** January 11, 2012, 19:45:20 PM »

Fantastic Martin - cant wait, doesnt look like there is that much to do from the pictures....

How come this is in the fixed wing powered flight section?

THEBOYBREWER · « **Reply #6 on:** January 11, 2012, 22:06:00 PM »

Quote from: jiberjaber on January 11, 2012, 19:45:20 PM

How come this is in the fixed wing powered flight section?

'cos hopefully hes going to do the decent thing an screw a nitro burner up the front of it

(have to be honest its not a design i know so no idea wether is glider only)

CF-FZG · « **Reply #7 on:** January 11, 2012, 22:19:21 PM »

Quote from: THEBOYBREWER on January 11, 2012, 22:06:00 PM

'cos hopefully hes going to do the decent thing an screw a nitro burner up the front of it (have to be honest its not a design i know so no idea wether is glider only)

There was also a powered version made

I'd prefer to see it with a pair of Estes D-11P types up it's chuff though - that'd really make it climb

PDR · « **Reply #8 on:** January 11, 2012, 22:54:41 PM »

Quote from: CF-FZG on January 11, 2012, 22:19:21 PM

I'd prefer to see it with a pair of Estes D-11P types up it's chuff though

As chat-up lines go, I have to say it's not great...

PDR

SpringHead · « **Reply #9 on:** January 11, 2012, 23:06:31 PM »

Quote from: satinet on January 11, 2012, 16:30:56 PM

Yes I saw that on ebay. I reckon you have got a pretty rare model there.

Is 4 elevons and 2 airbrakes? or 2 and 2?

It will be interesting to see this one build and fly.
[/quote
It has 2 moving surfaces at each end of the wing, I believe they are elevator and aileron and it has airbrakes

SpringHead · « **Reply #10 on:** January 11, 2012, 23:09:13 PM »

Quote from: jiberjaber on January 11, 2012, 19:45:20 PM

Fantastic Martin - cant wait, doesnt look like there is that much to do from the pictures....

How come this is in the fixed wing powered flight section?

Mmmm it's because I am dumb, I’ll try and get it moved but not sure where to as there are no build threads in the glider section or at least none that I clocked.

reverendkrv · « **Reply #11 on:** January 12, 2012, 01:16:11 AM »

looks like a nice model Martin,look forward to seeing her up the slope fella

jiberjaber · « **Reply #12 on:** January 12, 2012, 08:25:35 AM »

Quote from: SpringHead on January 11, 2012, 23:09:13 PM

Mmmm it's because I am dumb, I’ll try and get it moved but not sure where to as there are no build threads in the glider section or at least none that I clocked.

There is a Phase5 one on there at the moment, but it might have been bumped on to the front page.

Hows the lamination, liftging or still stuck down all round?

I'll be interested in the recommended control layout of the control surfaces as I have in board and outboard control surfaces on the QB. I have the outer surfaces as ailavators and the center ones coupled ailerons on a switch. I also have an inverted crow setup for braking (flaps up, alierons down).

So how far are you on with the build? I'd be half done by now LOL

paul w · « **Reply #13 on:** January 12, 2012, 09:48:38 AM »

lots of bits Martin, my advice.......just git 'er done!

SpringHead · « **Reply #14 on:** January 12, 2012, 10:29:54 AM »

Quote from: jiberjaber on January 12, 2012, 08:25:35 AM

There is a Phase5 one on there at the moment, but it might have been bumped on to the front page.

Hows the lamination, liftging or still stuck down all round?

I'll be interested in the recommended control layout of the control surfaces as I have in board and outboard control surfaces on the QB. I have the outer surfaces as ailavators and the center ones coupled ailerons on a switch. I also have an inverted crow setup for braking (flaps up, alierons down).

So how far are you on with the build? I'd be half done by now LOL

The lamentation is perfect the wood is really think 2 mm+, I am a little concerned about both wings though, and they look as if they have a decent amount of wash-out on them or they are warped, I’ll try and get a photo.
In the mean time I’m trying to scan the instruction manual and get each page down to 450 KB so I can post them on this forum, this isn’t going to be a quick build as I will be glassing the wings, that’s 4 days work minimum.

SpringHead · « **Reply #15 on:** January 12, 2012, 12:27:39 PM »

Wow, that was an effort, scan, ocr, edit

SpringHead · « **Reply #16 on:** January 12, 2012, 18:04:20 PM »

Finally, please ignore last post here are the full instructions.
Drawings MAY follow if I dont throw my scanner out of the window first

SpringHead · « **Reply #17 on:** January 12, 2012, 18:28:12 PM »

German instructions with drawings, now I should start the build, like I said before this is going to take a while as I havea 6 week old son who takes up most of my time

SpringHead · « **Reply #18 on:** January 15, 2012, 10:42:36 AM »

As you may have noticed from the instructions theres not a lot of info on setup apart from teh C of G.......
I am going to put the servos in the wings but I am not sure what type yet, I was thinking Futaba S3150's but they may be over speced' for the job, what are your thoughts? The fuse will have 2 servos 1 for the air-brakes the other for a tow release but I doubt that will ever get used.

RGN · « **Reply #19 on:** January 15, 2012, 10:54:46 AM »

Although I'm no German expert, I think the CG is there

Schwerpunkt translates to Centre of Gravity on a few online translation sites.

Copying the sentence that says "Die mittlere schwerpunktlage liegt bei der Cortina 286mm hinter der Flugelvorderkante an der rumpfanformung" into Google translate gives "The mean center of gravity lies at the Cortina 286mm behind the Flugelvorderkante at rumpfanformung" I take that to mean 286mm behind the wing leading edge measured at the fuse-wing junction

Leading edge translates to Vorderkante
Fuselage translates to Rumpf
Wing = Flügel

Hope that helps.

Richard

SpringHead · « **Reply #20 on:** January 15, 2012, 10:58:22 AM »

I have the instructions in English, I was saying that the only detail on set up IS the C of G. I'd love to know mixes and throws etc, thanks for your advice anyway.

RGN · « **Reply #21 on:** January 15, 2012, 10:59:15 AM »

Oh, sorry, I misread your post

Richard

BrianB · « **Reply #22 on:** January 15, 2012, 12:40:27 PM »

Spot on Richard.

And of course we're all aware of the importance of ensuring the Flugel is firmly attached to your Rumpf.........

Most of us simply wouldn't have it any other way.

P.S. Springhead, in order to add to the authenticity of the build you really ought to be wearing Lederhosen, and have a feather in your cap..............

PDR · « **Reply #23 on:** January 15, 2012, 13:23:10 PM »

I think that initially I'd just fly it with all four surfaces operating as elevons to get a feel for the sensitivities of the controls. As a general rule models of this layout tend to be fairly soft on elevator, so don't be scared to have a decent amount of elevator throw. But once you have this basic setup you can play with alternatives, depending largely on what your Tx can do. If you keep the basic setup as your main flight-phase you can always switch back to it while you're experimenting!

If your Tx can do it I think I'd suggest trying a variation on the setup I use in my 4-servo-wing models, where up to 50% stick movement only operates the outboard surfaces and the inboard surfaces are introduced after that (ie use a symetrical mix with dead-band). You could try this with both aileron and elevator. I wouldn't bother with "camber" settings because that's just elevator trim on a tail-less. Likewise I wouldn't use any differential for much the same reason. It would be fun to try a crow function in combination with the airbrakes if the brakes themselves don't bring it down fast enough!

This looks like a very interesting model - I envy you!

PDR

Author Topic: Multiplex Cortina (Read 1654 times)

Follow members gave a thank to your post:

Follow members gave a thank to your post:

RCMF Team