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

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Old 01-07-2018, 07:53 AM
  #26  
thomasmuckus
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Here comes the ingredients for the gear


the basic-platte from the gear-box



First fitting



so is the theory



ad now it works




Currently, without solid bearing, it takes close to 1,5 A, sonds many but in the realassembly it is with ball bearings and so I`m sure that the runnng amps would be lesser.
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Old 01-07-2018, 08:01 AM
  #27  
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The next step was to build a "dummy-gear-leg" the shockadsorber and the gearstrutt.


it fitts as well



it fitts also to the template



and > well done




the wooden strip in the middle of the hull stays for the retrackting screw, I hope you see the principle.



So I sended the complete dummy to the "Gear-Maker"
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Old 01-07-2018, 08:15 AM
  #28  
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While waiting for the shockadsorbers, I worked on the tail.
The plan was, just like in the original aircraft, to realise a variable longitudinal dihedral


the next turn for the milling machine > here are the parts



build



the most important part, the tail boom



also build



the whole thing was to heavy so I`ve done some changes to save weight.



You can see the working screw,with this I can cange the setting angle of the tail.
Now it is completed.



and so with the elevator added.
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Old 01-07-2018, 08:32 AM
  #29  
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The next part is the hull. By starting this model, I decided to work so close as possible to the original structure. My first idea was to buildthe hull-structure also from stailess steel tubes. But, I canceled this.The reason is simple, if I replase the tubes with strips, a damage is very, very easier to repair than with tubes.


I started with build two ladders



and than,step by step, it looks like a half-timbered house, and, so it should do, light, but very strong


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Old 01-07-2018, 08:38 AM
  #30  
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before build in the tail boom, I had to realise the elevator steering.



push rod, made from carbon fiber


and build in, with all levers.

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Old 01-07-2018, 08:46 AM
  #31  
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first fitting


after a thousand times measuring > glued !


it looks so good with the elevator.
The complete tailboom weighs close to 260 gramm, it is o.k. for me. I can cange the angle in a range of +/- 3 °, I think it will be enough in all cases.

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Old 01-07-2018, 08:52 AM
  #32  
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And than, Christmas Eve............. The parcel arrived when I was at work and my wife was the silence in person.



unpacked > the long, long awaited shockadsorbers.
Bernd Lieseke, from http://www.hawe-modellbau.de/ has done a very good job, he topped my concept and I`very, very happy



On the same evening I buld one leg in my dummy and it works as well and looks very good too.

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Old 01-07-2018, 09:00 AM
  #33  
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Currently I`m working on the wheels. It is very difficult to get the right wheels, with this big diameter an very tiny tyres. So I decided to make my own ones. Max Merkenschlaeger had done it years before (see the drawing) and here are the parts.


I also started with the lower bearing block of the retrakting screw.



I promise to update this tread in the future quicker.............
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Old 01-08-2018, 06:35 AM
  #34  
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Nice work Thomas!
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Old 01-13-2018, 08:47 AM
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Very impressive. I,m looking forward to seeing more of your engineering.
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Old 01-18-2019, 09:12 AM
  #36  
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Hi guys, I`m back.
Yes, I know, it was a long time of silence, sory for that. But I had to repair my Ryan STA. I crashed it in the middle of summer in a starting accident. The sidewind pushed it into our safety net, the wings and the elevator where broken, the fuse was also damaged,a desaster.
But, now it is finished (new wings, new elevator) and I gain from this the motivation to continue the Hawk.
I interrupted the story when I started with the wheels and the fuse.
O.k., we continue with the wheels. Nowhere you can buy wheels with 185 dimerte whith 45 mm tires. You have to make them your self. The parts for the rims I had always shown, now I putted them together.
After some work on the lathe, the first wight control.




72 gramms are not bad but I drilled some holes an here is the result

20 gramms per wheel, 40 in summary, o.k.
Now the tires.
I use rubberstring (normaly the use this in big airconditiones as gasket), glued it to a ring in a template and here it is



The last step by the wheels was covering the sides with glasfiber.
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Old 01-18-2019, 09:27 PM
  #37  
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Wow! Amazing build! you are going to have a masterpiece when you are finished. Work like yours inspires us lesser craftsmen to keep building. Keep it up!
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Old 01-19-2019, 10:56 AM
  #38  
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@ Mrotar > Thanks a lot

Now I continue with the fuse.
At first I hat to prepare the vertical decks. These parts are very important. They carry the lower wing and the landing gear.
The milling machine from my buddy wasn`t big enuogh to make it as once so he did it in two parts.

I glued them together and they are covered with carbon fiber.

As next parts I cutted the gear bridges from carbon fiber covered plywood.


Now I need two bearing blocks, they fix the screw spindles. The parts are cutting fromn "Novatex", light, solide and easy to work with.





assambled


Till this time I was on the bright side of life, in my minds the landing gear was finished, all my fears abiut it were in a long, long past.
I builded a gear box, assembled it.



built into the fuse, it looks great.




But then, the first test > se your self > a real desaster:
The drive was to weack, the transmission ratio was complete wrong, the current consumption to high, and I was destroyed.
The next gear attempt I started with a worm gear.

It also failed.
In our modelling club the guys helped methink and we found a solution.
Now I use strog servos as drive, 40 kg power. The electronic is removed. The first attempt with tooth belt looked promising,



the final solution now ist a spur gear.







I marked my success on my studio door


And here it is



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Old 01-19-2019, 11:08 AM
  #39  
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Santa Claus was my friend



It is a varialble pitch propeller, I love it.

One of my buddies in our modelling club is very experienced in3-D-printing. He builded himself a 3-D-printer and done the tail gear for me.

There are two differend options, the left is made from the Wylam-drawing, the right I saw on an pic.
I use currently the right one, in our german "warbidforum" is a guy who is very often in Bangkok, Ihope he can help.


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Old 01-21-2019, 01:47 AM
  #40  
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Now it stand on his own wheels for the first time

It is time to adding wings, I`m sure it will be useful for an aircraft.
At first the son of one club members done some metalwork for me. He owns a small company that is cutting parts with heavy water jet. This are the fittings to hold the upper wing and the flying whires. The small strips are the flying whires.


As the next I`ve done a device, an apparatusor so to simulate the upper part of the fuse. I had to fix the middle part of the upper wing.



the most is done from corrugated board, it had only to hold the right position.
Than I simulated the struts with wooden stips.


Some futher metall work andI replaced the wood with metal.



To compareto the original aircraft
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Old 01-21-2019, 01:53 AM
  #41  
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first test, first building all components together, one thousands hours of messuring, glued, fixed




Every time when I build a biplane together for the first time, I`m embrased > an tremendous block
So, this is the current status, I`working on the engine mount, my "milling"-man is working on the formers, hope to see you.......

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Old 01-21-2019, 06:01 AM
  #42  
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Impressive craftsmanship!
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Old 01-21-2019, 12:01 PM
  #43  
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Agreed! Really nice! I'd like to see a video of that landing gear in action.
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Old 01-22-2019, 08:30 AM
  #44  
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I'm very impressed. I am looking forward to seeing how the water jet cut flying wires work out. Will the wires be functional? The wings already look pretty strong.
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Old 02-07-2019, 10:40 AM
  #45  
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@ Matt > the wires will be functional on the tail and on the middle part of the upper wing. On the others you are completly right, the construktion is strong enough. The water jet cut wires working as well in an other plan, looks very "scale", better than round wire.

I got a birthday-present from my milling master > a lot of cool wooden stuff.


the first quick snap assembly of the nose with the engine doom


The engine doom ist glued together, it will reinforced with carbon fiber.


Now, the fuse is slowly taking shape.


the gear is in, the wheels fit pretty nice into shape.


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Old Today, 08:49 AM
  #46  
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the engine doom is reinforced with carbon fiber

As the next step, I snapped all together and the engine took place for the fist time, hip hip hurra


the prop is a varialble pitch propeller from the german fakturer Ramoser, great stuff


The big holes in the sides f the box should give me the access to the carburetor. Fortunly, the original aircraft had a big service slot at the same place

So I didn`t need a complicated solution for chooking, I can do it with a finger


Now, all fits together, the holes for the ignition and the throttle-servo are doe, so I can glue the whole thing together
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