1: 3.25 scale MG19a Steinadler

Paul ELLIS · Posté le: 24/12/2008 10:12 Sujet du message:

Ouch!

I have seen Ramin in Mr. Bricolage over here and the quality seems good.

J'ai vu le Ramin en France à Mr. Bricolage et je croix le qualité et bon.

Happy Christmas and a Prosperous New Year Chris

Joyeaux Noël et Bonne Année Chris

... et à tous

cw · Posté le: 28/12/2008 18:56 Sujet du message:

I hope you are all having a good holiday. Time to move back to the workshop...!

Making up the wing root fairings...

Once on the fuselage, how do we make sure they are parallel to each other?

First I used the old method called the 'drop test'.

Then I used a much simpler method by making up a BIG pair of callipers

Now the fairing is lined with CTP and the rigging angle is checked by means of the incidence gauge

Stephan · Posté le: 28/12/2008 19:40 Sujet du message:

Hi Chris
An observation I often made with the Musger MG19 construction is the wrong angle how the wing root fairings are mounted with regard to the fuselage. If you have a look on a real MG19 you will realize that the angle stays exactly the same as the angle of the wing at that point. Thus if you want to be full-scale you might change it. That was the reason that I have changed the layout of the formers of my 1:4 MG19A construction as you can learn from this subject http://www.retroplane.net/forum/viewtopic.php?t=1742&start=0 or this picture

I Hope you understood what I want to say [humm]

Stephan

cw · Posté le: 28/12/2008 21:03 Sujet du message:

Stephan, thank you for your comments... I guess it is all a matter of philosophy: I prefer to build many models with minimal scale detail, rather than a few that are scale perfect. I have used a model profile on my wings, (HQ) so already there is a deviation from scale. I usually work from whatever photographs I can find, and looking at this one, I'm not too worried about this detail difference... (When the model is completed, I will post a photo from the same angle Very Happy

Stephan · Posté le: 28/12/2008 21:07 Sujet du message:

Walter · Incurable Posteur Inscrit le: 05 Nov 2006

...Chris...were did you find this picture...?

The owners of the original always search for pictures - an I too... Wink

Here is one from Innsbruck - during summer the MG19 is stationed here...

Walter

cw · Posté le: 28/12/2008 23:45 Sujet du message:

Walter, search Retroplane, there is a photopack...
Very Happy

cw · Posté le: 30/12/2008 12:31 Sujet du message:

Work commences now on the outer wing panels

Setting up for the joining of the spars. This is where vertically oriented spars are useful, as there is plenty of glueing area for the join...

Now the spars are ready to epoxy together...

Here the spar joint has been reinforced both sides with .75mm CTP...

Now it is starting to look like a proper glider

VincentB · Posté le: 30/12/2008 12:50 Sujet du message:

Hi Chris
Always so fast Shocked

but what you will build for 2009 [arf]

Paul ELLIS · Posté le: 30/12/2008 12:57 Sujet du message:

Blimey Chris, if they get any bigger you'll have to take that hedge out! Wink

Excellent job as ever. [amen]

patte de loup · Posté le: 30/12/2008 19:42 Sujet du message:

Ouahhhh

...... so quick , so fast, so speed.... But so.... beautifull [clap]

No break during the Christmass time? Wink

have you already used the Christmass tree for the spars Laughing

Pat'

cw · Posté le: 30/12/2008 22:33 Sujet du message:

Pat, I have no use for Christmas trees...they prevent rigging indoors where it is warm!

I do not know how it will translate, but I have my epitaph already written...

'Here lies old Wil, dead as a brick,
He wasn't much good, but he sure was quick...!'

cw · Posté le: 02/01/2009 00:12 Sujet du message:

The wings have been bottom-sheeted, now it is time for the most critical part...The wing is supported on 4 supports, shaped to the bottom of the wing,

and all set at a zero angle...
A straight piece of balsa strip is taped to the TE to keep it straight...

Another view of the wing supports...

Masking tape: it has a 1000 uses!

cw · Posté le: 04/01/2009 21:09 Sujet du message:

The factory has closed for a few days due to some unexpected FLYING WEATHER...!

cw · Posté le: 11/01/2009 23:24 Sujet du message:

Time now to look at the ailerons... 1st, the shrouds must be made up from .75 CTP and 1.5 balsa

Now the shrouds are glued top and bottom to the wing...

The aileron is built in a similar fashion to the rudder...

cw · Posté le: 18/01/2009 23:03 Sujet du message:

The main airframe is now built, so things slow down a bit as the more detailed work needs to be done...

The basic, unshaped aileron is hinged with Robart hinges and attached to the wing...

Now the aileron is sanded to fit the wing...

Today, the aileron has been fitted out with all the detail work, and the wing tip shroud finished off...

The servo and linkage are also fitted in...

Then I went flying with the Dart 17... Very Happy

cw · Posté le: 24/01/2009 17:47 Sujet du message:

Today, a chance to see the assembled planeur...

loopingfred · Posté le: 24/01/2009 20:28 Sujet du message:

Wow, looking really good Chris !

What is the weight so far ?

cw · Posté le: 25/01/2009 11:57 Sujet du message:

I don't know the weight so far, Fred, but I expect it to end up very similar to the Minimoa at 11-12kgs...

Laurent Beldame · Posté le: 25/01/2009 16:01 Sujet du message:

No doubt the gull wing variant of the Musger is very nice and your job/commitment/patience is remarkable..
Bravo..

cw · Posté le: 01/02/2009 16:12 Sujet du message:

This is the bit I've been putting off until last...the airbrakes!

To make sure they close properly in flight my airbrakes are to be spring-loaded

Cutting out the ribs for the airbrake assembly

Now they are glued into the wing

Finishing off the bottom sheeting

It works

The wings are now just about complete. Fred, the model weighs 20lbs (9Kg) at this stage, that is with some ballast built in the nose. The CG is on the spar at the moment

cw · Posté le: 14/02/2009 22:13 Sujet du message:

I have spent the last week working in the cockpit area...

cw · Posté le: 26/02/2009 00:27 Sujet du message:

Working at the rear end again... this is the fairing for the fin/tailplane

The tailplane is now properly sorted out, and since this photo was taken, all the flying surfaces have been covered with Natural Solartex...

patte de loup · Posté le: 26/02/2009 02:57 Sujet du message:

Hi Chris ,

What kind of solution do you have implemented to be sure no weakness
appears on the base of tail due to the notch? [humm]

Is there any additional support inside the tail? [humm]

I am interessting about that for a futur scale plane. In that case, I am little bit concerned regarding the the landing impact. Rolling Eyes

KR
Pat'

Benoit1664 · Posté le: 26/02/2009 10:25 Sujet du message:

ohhhh, brilliant building

cw · Posté le: 26/02/2009 21:39 Sujet du message:

Pat, I was surprised when I removed the 2mm balsa sheeting how strong the tailplane still was. (The brick weighs 2Kgs!)

The tailplane rear spar is made from 6mm hard balsa and is reinforced with 6mm triangular section to make the hollow for the elevator leading edge. Into this are some quite large holes for the hinge dowels, but of course the elevator leading edge adds strength too once it is fixed into place... The MG19a is not an aerobatic machine, so I think it would take a lot of speed or a very heavy landing to break it...

Paul ELLIS · Posté le: 28/02/2009 23:43 Sujet du message:

Hi again Chris

Just for the record, how much Solartex did it take?

TIA

Paul

cw · Posté le: 01/03/2009 10:17 Sujet du message:

I started off with 10m roll, Paul, but I've had to buy an extra 3m for the fuselage...

cw · Posté le: 05/03/2009 20:51 Sujet du message:

Deep into the painting process now, so progress is sloooow!

The whole airframe is covered in Solartex

Al the 'Tex joins are sprayed with 2-pack primer in order to lose them

cw · Posté le: 13/03/2009 22:25 Sujet du message:

Still deep into the painting process...

The wings have been sprayed with 2 coats of 2K lacquer and are now being rubbed down wet with 600grit paper, ready for the next application of lacquer...

The tail end is almost completed...

These are some of the parts to go into the cockpit, nearly 600gms