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Scratchbuild a Curtiss Hawk III (BF2C-1) in 1/4.5

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Scratchbuild a Curtiss Hawk III (BF2C-1) in 1/4.5

Old 03-24-2019, 01:59 PM
  #51  
Mrotar
 
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Wow, very nice work, you are going to have a real masterpiece!
Old 05-28-2019, 10:56 AM
  #52  
thomasmuckus
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thanks a lot, I`m very honoured.
So, now it seems to switch to shipmodelling, I had to ad some balsa strips.






the bootm is finished, now the rest of the hull






Old 05-28-2019, 11:02 AM
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Planking is looking good. Where do you get your pushpins? I like those plastic heads they have. I'm sure they are easier on the fingers than T-pins.
Old 06-02-2019, 01:35 AM
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Those pushpins are made in CZ, they call them " špendlky". Not expensive, a box with 50 pieces for close to 3 €
now we continue with the aircraft.
The original plane has a has a kind of luggage flap at the rear
at frst I `ve done a frame


a little bit of planking too

planking the rest

Now it needs a hinge. The first idea was to use a prefabricated hinge, butit wasn`t satisfying. So I`ve done it my self, it is very simple.
I used a small brass tube, solded some small brass sheets and this it was....



Compared to the prefabricated > my own ones is lighter and works very smooth


And so it works. For closing I use magnets, the original locks will be only simulated.


Old 06-02-2019, 07:24 PM
  #55  
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Excellent! I may need a new keyboard after drooling over your handy work. I found those pins on this side of the Atlantic and ordered 2 sets. They are a bit more expensive here about 6.7 Euros.
Old 07-04-2019, 02:28 AM
  #56  
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Thank You so much my friend, You are a really fan
At first > very bad news, I crushed the Ryan. Devil would know why, I hve no idea.It was a beautiful take of,rolls, loops, turn, every thng was fine. And as I decided for landing, into the paralel flight into the traffic pattern it goes into spin, four and a half rounds and it was it..........I wasn`t to slow or so, the telemetry says als nothingfor use,I can only take it as kismet.
I was crying for some days but the show must go on
Now it`s going straight on there.
The complete planked fuselage with gear out

and gear in


In the past I`ve written that I like big service doors. By the original aircraft the tail section is metall covered like this.



So I decided to do so as the same, make it removable and use it as service door.



The fist step is to fill the place with Styrodur, it`s stronger than the normal Styophor.

after a little sandig > it comes closer.


As example I use the Hasegawa-Kit


I think so it will be o.k

.
now a seperating layer from packing tape



covering with fiberglass


after cutting in form


finished (after filling and sanding and filling and sanding......)


Now I need a little part on the fin so I seperated all a second time, sculpted the part with modelling clay and covered, filled and sanded....



Last edited by thomasmuckus; 07-04-2019 at 11:50 AM.
Old 07-04-2019, 04:27 AM
  #57  
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When we talk about service doors > the biggest and the most used is this on the botom of th fuselage:


It wil be opened and closed everytime when I try to use the aircraft because here is the access to all inside components.
And therefore it had to be opened quick and easy.
In our german comunity, the "warbirdforum" I saw a solution from one of the heroes, Detlef Kunkel. And so I buld this:



Old 07-04-2019, 05:02 AM
  #58  
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Now it is time for the cowling.
At first, I need a model. SoI glued some layers from Styrodur together, bring it in form on the lathe.



the work with the seperating layer from packing tape you always know, abd tha I covered the whole thing with on layer 80g/m glasfiber, one layer 160 g/m carbonfiber,thenext layer 80 g/m glasfiber ans as final layer for better suface, 25 g/m. With the help ofthe drilling machine it all was smoothed.




It looks nice doesn`t it?



The weight of 222 g isn`t to much I think. I`m sure that I need weight in the nose so thisshouldbe a problem.

Now I standbefore the problem > how to fix it. It shouldbe easy and quik removable,strong andI had also to add the dummy engine for the Wright nie-cylinder engine.
As first, I cutted from a 3 mm plywood a cooling wall. Only the air that passes the engine in a distance of 5mm will cool it so I had to lead the air in its right direction.


The ide is to hold al this, the cowling and the dummy with three distanceholders in direction. Withthree srews I can now removen the cowling and the dummy at once.
First stepp with a dummy of the dummy, made from corrugated board and coctail sticks.


This are the distance holders, an alu tube with an insert of alu too, with a M 4- thread.

So it fits all together, at first the engine and than the rest.....




A first look at the hull with the cowling mounted
Old 07-04-2019, 05:13 AM
  #59  
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the last for today, the completing of the elevator.
At first, the mass balance for the elevator.


a small drawing,and than I made them from PC-card-material





and so it looks whe builded in





Now some metalworking, the fittings for the flying whires




The original aircraft uses Flettner-flaps, so I had to build this.

It is simple but takes time.
The pics says mor than words, I use a 0.8 whire as angel.












Last edited by thomasmuckus; 07-04-2019 at 06:16 AM.
Old 07-04-2019, 06:36 AM
  #60  
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The flying whires to the middle part of the upper wing are added too.





Everybody know that situation, you have to turn the hull and you will get a damage.
as you can see, I reinforced the stingers with 1mm x 4 mm carbonfiber strings. Now this all is very strong and light too.


Currently I`m filling and sanding the fuselage and after that, it will be covered with 45 g/m fiberglas to strength the surface

In my studio I have a temperature of nearly 40 degrees so Ido this job outside

Last edited by thomasmuckus; 07-04-2019 at 11:51 AM.
Old 07-04-2019, 06:48 AM
  #61  
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Wow! Things are really coming along since the last time I looked in on your build. There is just something aesthetically pleasing about a planked fuselage.
Old 07-08-2019, 05:36 AM
  #62  
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Work of art!
Old 08-23-2019, 11:45 AM
  #63  
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Thanks a lot guys, you are really fantastic followers. And therefore, it`s going on here.
Before covering the whole hull with 25gr./m glass, I covered the edges of all openings with one layer 80 gr./m glass. So i get a strong edge, better to handle when I sand and finish the surface of the hull.


The next step is adding the25 gr./m glass to harden the whole surface.


drying


Don`t forget all lids and Flaps to cover.



the "netto" wheigt f the hull > 2227 gr., I kan live withthis.

.

Before I started with the conformations of the lower wings to the hull, I fixed the angle of the lower wing, this is the only angle that is fixed, all ohters, upper wing and elevator I can change.



The lower wing is now at 1, the upper wing is 0 and the elevator is -1.5 (at the beginning) The engine has 1.5 up.
Now i had to make the Conformations. At the original aircrakt they are made from sheet metal, possible to do so but forme it would be easier to make them from fiber glass.
At first, I`ve done two ripps and some metalwork to hod the flying whires.


Those ripps arefixed at their position at the hull.
.


the gap between the ripp and the hull needs to close.


Last edited by thomasmuckus; 08-23-2019 at 11:49 AM.
Old 08-23-2019, 12:07 PM
  #64  
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At the original aircraft, the sheet metal overlaped the covering of the lower wing.


For me it would be easier to make this from glassfiber.
At first,the part is filled with styrodur > remeber, Iused it at the til,really great stuff.

Than I added teh wings to smooth it all.




It is terrible idea > if I`make them with the original wings and the are glues at the hull. So I`ve done two dummy ripps and replacedthe wings with those ripps.

that I protected the surface with packing tape andcoverde all with fiber glass.



The finished parts.



And so it looks when they are in place.




If you think it looks a little bit raw, the originl was also very raw so it`s "full scale".


at last > the weight >I`m very satisfied.

Last edited by thomasmuckus; 08-23-2019 at 12:11 PM.
Old 08-23-2019, 12:23 PM
  #65  
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What is the next?
Service openings, surey.
Marking and covering/protect the hull with packing tape.


one layer 80 gr glass, one layer 160 gf. carbon, one layer 80 gr. glass and 0ne layer 45 gr. glass to smoot the surface, I think it will be strong enough.


after cutting out the opnings, I placed the engine.
It works exactly as planned, I hve free access to the carburettor from both sides




Currently I started to do the muffler, I must wait for some tubes.....
Old 08-23-2019, 12:27 PM
  #66  
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Beautiful work! This airplane is really progressing nicely. You are going to blow everyone's socks off with this model!
Old 08-25-2019, 05:01 AM
  #67  
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Thank you
I wanted to get an "overview" to control the current weight and the optical effect.
Look here:



Than I hung it on the hook.
If the gear is in, it looks very dynamic

Now the moment of truth > 8,5 kg, I`m very satisfied.
I have to add five servos, the muffler, wing struts, flying whires, covering and finish and a pilot. So I`m sure that it would be less than 12 kg when it is finished

Old 08-25-2019, 07:16 AM
  #68  
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Very nice Thomas. You made a masterpiece! Congratulations
Reuben
Old 08-25-2019, 11:37 AM
  #69  
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She looks great standing on he own feet!
Old 09-04-2019, 09:18 AM
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Very nice so far, you have a very beautiful biplane.

And thank you for the detailed build photos and comments on what you have done at each step. I've picked up a few ideas I will use in my own builds.

Maurice Pudlo
Old 09-28-2019, 09:54 AM
  #71  
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Hi guys, I`m back.
I started building the exhaust. But, before I had to fix the cowling, because I need to know how much space it will be between the cowling and the fuse.
So I`ve done an wooden sheet to control the air for cooling. This was placed into the cowling.


Three pins are olding the cmplete part in place.




The gap between cowling and fuse wil be great enough.


Now to the muffler.
At first, I had to replace the original mainfolds. They looks so terrible.....

so I cutted of the old exhausting tubes and builded my one ones.






now its nice


The next step is fixing and cutting the tubes.



Three holes where drilled and the whole thing was soldered. I startdsoldering at the fuse, the fuse was safed with alu covered fiber glas.




The "intake"-side is done
Old 09-28-2019, 10:07 AM
  #72  
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Now the outlet.
Some tubes are cutted, some hole where to drill and between > fixing, controlling, fixing.....






than, soldering with the same method like the intake.

All tubes are solded, the cowling fitt as weel so I had to cut them to the right size.







Finished. I monted the complete engine on my test station


soundcheck!!! https://www.youtube.com/watch?v=cxoP...ature=youtu.be
Old 09-28-2019, 06:40 PM
  #73  
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That is some exhaust ring! Nice work!
Old 09-29-2019, 07:55 AM
  #74  
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I agree with FlyerInOKC. It has a very good sound. What sort of torch did you use for the soldering?
Old 09-30-2019, 07:39 AM
  #75  
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I use this one


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