RE: CMP 120 Zero ARF Build thread
 

@ZERO-322
I am still having problem, in mu head, how to make sliding canopy.
I can see on your pictures that you have some kind of channel mount on the fuselage.
Things that I don\t understand are:
- what did you put on the door (that slide in channel)
- what is happening when cockpit is at far back end (is it than hanging on very small part of rail)
- do you have some servo operated this cockpit or you have to open it with hand.

All this questions are because I am considering to make sliding cockpit so I can put in all switches and
control instruments (for pressure, battery...) . Other option is like Pilot has done, make some compartment
on the side of fuselage, and put one hinge on one and magnet on the other side of that "service door"

RE: CMP 120 Zero ARF Build thread
 

The canopy was cut into its three respective pieces and then mounted using two plastic C channels to make a canopy rail these can be found from the model train guys its from a company called plastico , these were glued directly to the fuse using thin CA, inside the sliding canopy section a piece of plastic I beam was glued and threaded through the rail that had been glued to the fuse, the canopy is manually operated and is latched using tiny magnets, I'll take some close ups of all the componets when I get home from work that way it should give you a better idea of what I'm describing its always easier with a few pic

RE: CMP 120 Zero ARF Build thread
 

Misha here are a few closeups if you need any more help PM me and maybe I could go into a little more detail

RE: CMP 120 Zero ARF Build thread
 

Zero, thank you very much. These pictures are enough. I will make something like this,
but I will try to make it slide by servo. Thank you again.

RE: CMP 120 Zero ARF Build thread
 

While the epoxy dries, I took out the motor for the first time it honestly look.
It is Zenoah ZG 26 SC, magnetic ignition.

http://img177.imageshack.us/img177/8786/z10ei.jpg

http://img62.imageshack.us/img62/2741/93033429.jpg

It is not light engine, but I hope that I will not have to add lead. This engine has
carburetor on the side, which is a disadvantage (it is wide) and an advantage - it is short motor.

http://img69.imageshack.us/img69/1421/dscn1909lw.jpg

http://img34.imageshack.us/img34/9361/dscn1910a.jpg

Chinese engines have a carburetor back so they can be installed in any model. drawback is that they then have to tie spacers and rely on a relatively small area.
This engine will be bonded to a piece of thick spera about 3 cm (included with model) so it will rest against the entire surface of firewall .

Since I wanted to avoid over-cutting the hood, I ordered (http://www.toni-clark.com/) metal pipe,
with which the carburetor is rotated by 90 degrees and thus takes up less space.

http://img84.imageshack.us/img84/8474/dscn1911t.jpg

Along with the pipe they give a new set of seals, and a set of new, longer screws.
(Do not know what this RED seal is for)
This is assembled carburetor

http://img405.imageshack.us/img405/7906/dscn1914f.jpg

http://img213.imageshack.us/img213/1140/dscn1920f.jpg

http://img683.imageshack.us/img683/5874/dscn1925oc.jpg

Of course, I wanted to try how it will all look under the "hood"and for now I'm satisfied.
Of course, on the other side (still visible screws) will be a muffler, but I think that it will go out only with its two tubes.

http://img522.imageshack.us/img522/1...orspakovan.jpg

http://img72.imageshack.us/img72/362...rspakovan1.jpg

The only problem will be where to mount throttle servo.

That is it for now

RE: CMP 120 Zero ARF Build thread
 

misha034 I didn't realize TC had a carb intake bend for the G-26.
I love how that G26 fits so well inside the cowl of the zero.
Zenoah's are actually everything you need in a warbird engine, heavy, strong, and powerful.
They will last for 10 years easy with proper care.


By the way, that red part is the heat insulator that keeps the carb from direct contact to the cylinder head.
The way you have it set up now, there is no heat insulator between the carb and the metal. A gasket by itself is not enough.
There is supposed to be a gasket on both sides of the insulator as well.
Carb, gasket, insulator, gasket, intake bend.

RE: CMP 120 Zero ARF Build thread
 

Misha I love the last pictures talk about giving a good reference in cowl to relation of engine ! Great work ! some of your post have been invaluable, I got an RCGF 45cc nib way to big for this bird ! hopefully I could find someone to trade with for a more appropriate size engine for this baby I've got a few running mock ups of the exhaust but I need to settle on an engine before I could finalize anything, any takers ? LOL

RE: CMP 120 Zero ARF Build thread
 

Whistling Death, thank you for advice.

Zero,-322, My friend Mirce has Zenoah 45 in his bigger Zero, 2.1 m, and it is powerful enough in that big bird.
I think that any 26 engine is enough.

RE: CMP 120 Zero ARF Build thread
 

And, don't forget to say, my big Zero is 12 kilograms...

RE: CMP 120 Zero ARF Build thread
 

It is nice to have you here Mirce. Make sure to make lot of free space in your workshop for this big wing.

After little research, and different ideas, i have found this picture. I magnified this parts, and I think that solution is
definitely here. as you can see, isolation is going between pipe and carburetor. isolation is that part that on top left side circled in red.
This is picture from Tony Clark's web .

RE: CMP 120 Zero ARF Build thread
 

Misha - glad to see Toni Clark developed the 90 degree manifold for the G26. I have their 90 degree manifold on my G-62 powered Ziroli P-40. Works great and keeps the carb entirely inside the cowl. Also, TC recommends the insluator so that the carburetor does not heat-soak after sitting for a few minutes and aids in hot-restarts. I do not believe it has any affect during normal running...but that's just what I've been told. Either way, if you can fit the insulator, can't hurt and can only help. Looking good!

RE: CMP 120 Zero ARF Build thread
 

Mirce welcome good to have another join our ranks ! LOL

misha if you do take the canopy a step further by actuating it with a servo I do hope you share how you did it, it seemed a little more complicated then I wanted to attempt at the time, but at least the knowledge of how its done may give me the itch to try it in the future perhaps on my yellow Zero if i ever get to it LOL I gotta tell ya but these CMP warbirds are an excellent and inexpensive testing platform for trying out new skills and ideas

RE: CMP 120 Zero ARF Build thread
 

Last night, answer came from Tony Clark, an it says:

It is the insulator and it is there to avoid heat transfer from the hot cylinder to the carburetor. If
you look closely on the picture you will see that there is a gasket on both sides of this insulator.
This is the reason is why we deliver one extra gasket with the carburetor bend.
The other two gaskets you already had with the engine.

Mystery is solved.

RE: CMP 120 Zero ARF Build thread
 

Zero 322, thanks for nice words...

I just want to say that with my Zero I have 206 flights till now, and after three years I still enjoy very much in this model...

In November 2009 on our airfield I have a little damage on model, but after repair it fly like new...
Here is link to our Modeler Forum how fix a damage on Zero

http://rcfly4um.org/index.php?topic=3281.0

On Zero, all systems work grate, G 45 work fine, model fly with that engine very well... Robart retracts is also in good form, work very well...

All in all I love this model...

Best regards

Mirce

RE: CMP 120 Zero ARF Build thread
 

I've started doing the panel lines on my Zero. I used a No lead pencil to mark the lines and then on the top of the wing used a Sharpe fine point permanent marker. Looks ok on the dark green top of the wing, but I think it will be to bold on the light gray bottom. Any suggestions? Different color? Here are pictures so far. Those are pencil lines on the bottom.

RE: CMP 120 Zero ARF Build thread
 

That should be No. 2 lead pencil that I used.

RE: CMP 120 Zero ARF Build thread
 

personally I think it looks great as is ! what's your overall plan ? where you going to weather it ? if so light heavy or moderate ?

RE: CMP 120 Zero ARF Build thread
 

Have not decided on the weathering. One thing at a time. Can't decide weither to use the black sharpie on the bottom or not. Once it's on, won't come off. Never done panel lines and weathering before so this is all new to me. Don't want to use stuff where I have to over spray with a clear coat because don't want to add any weight behind the cg.

RE: CMP 120 Zero ARF Build thread
 

Bear this was my first attempt at weathering, like you I penciled in the panel lines and then lightly when over them with a grey and silver charcoal pencil after clearing it with lustercoat I took some fine steel wool and hit the entire wing and fuse surface this dulled blended and weathered the surface, if you go back in this thread weathering is explained in a little more detail < I wouldn't use the sharpie on the bottom but rather leave it as you have it with the pencil just through a coat of clear on it to seal your work

RE: CMP 120 Zero ARF Build thread
 

Weathering on Zero is very nice...

Mirce

RE: CMP 120 Zero ARF Build thread
 

Ok so after some bench testing I've discovered that JB weld and soder seals the exhaust perfectly, so I'm in the stages of assembling the main structure of the exhaust, from the outlets I plan on running some slightly thinner walled copper which will allow me to get the proper bends and shape for each one

Pilot how am I doing ! LOL

RE: CMP 120 Zero ARF Build thread
 

Looking good Mike. Can't wait to see it fitted to the Zero.

RE: CMP 120 Zero ARF Build thread
 

thanks buddy coming from someone that's done it is a real compliment ! Pilot how did you go about securing the exhaust to the firewall ? did you weld or soder the brackets on ? and did you insulate the bracket from the firewall ?

RE: CMP 120 Zero ARF Build thread
 

Very cool stuff being made in this forum!

RE: CMP 120 Zero ARF Build thread
 

That is what makes RCU great!