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The Warbirds Replicas Macchi C.202 is Landing!

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Nigel R18/04/2017 14:22:02
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1042 forum posts
252 photos

that looks brilliant

Dwain Dibley.18/04/2017 16:24:56
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908 forum posts
917 photos

A tip for channels in wood etc..

I use card, pushed in to the slot or whatever you have gouged out, and glued with CA or PVA, once dry cut it back flush and Hey Presto, a nice smooth, channel that can be sanded and painted just like wood.

That fuselage is looking mighty smooooooth....wink

D.D.

Edited By Dwain Dibley. on 18/04/2017 16:26:11

Colin Leighfield18/04/2017 16:29:23
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5372 forum posts
2180 photos

Great job, well done. Absolutely no doubting what plane that is! When Castoldi designed the Mc200, bearing mind that the Folgore and Veltro are really re-engined versions of that plane, he wasn't thinking of shooting down Spitfire's. As late as 1940 we were negotiating with Italy to buy planes from them, one of them was the Caproni Reggiane Re2000. I don't think that many people are aware of that. Obviously it all changed when Mussolini was so convinced that we were going to lose that he declared war opportunistically and tried to join into the Battle of Britain. If he had thought we were going to win he would probably have declared war on Germany!

RICHARD WILLS18/04/2017 17:25:35
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358 forum posts
40 photos

What a shape Brian ! All that work is paying off . She's the Sophia Loren of the aircraft world.cheeky

Paul Johnson 418/04/2017 18:17:57
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631 forum posts
430 photos

OMG..... told ya he was the messiah no wait over 25 definitley a naughty naughty boy....

Cause he is soooo much better than me...

RICHARD WILLS18/04/2017 18:33:20
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358 forum posts
40 photos

I thought you meant Messiah as in Life of Brian .

Look what happened to him....

Still , at least he was singing to the end .

I got chucked out of Sunday School.

They didnt recognise talent in those days.devil

Paul Johnson 418/04/2017 19:22:59
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631 forum posts
430 photos

I heard about kids like you getting chuck out of Sunday school..... you were lucky mate they wouldn't let me in!

Still.....Always look on the bright side of life!

Brian Seymour19/04/2017 00:19:06
136 forum posts
422 photos

Cheers men.

Great tip on the card Dwain, I'm in half a mind to use that method on the 2015 model as I didn't put the gun channels in on that one and it seems like a cracking method for a retro-fit.

Excellent background thanks Colin, I didn't have the faintest that we had negotiated to buy Italian planes, the mind boggles thinking about how planes would look and perform if Mussolini sided with the allies.

That's a comparison and a half Richard - I can't remember now if there was any effort involved!

Paul, I've seen how you finished your Spitfire and how you're progressing the Bf110 - I can't help thinking the reverse!

Colin Leighfield19/04/2017 06:28:19
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5372 forum posts
2180 photos

There are loads of interesting Italian WW2 planes that would make great models. One that I believe that we thought of buying was the Caproni Libeccio twin. I've always fancied the Breda Ba65 as a model as well. Not hugely successful, a bit like the Fairey Battle in some respects, but full of character. Like some of the Japanese types, we don't see enough of them. The Folgore and Veltro are outstanding examples of Italian design capability. I think you are going to be chuffed with the results of your efforts.

Chris Walby21/04/2017 11:29:25
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406 forum posts
65 photos

Hi Brian,

Firstly great looking build you are doing there.

Secondly you initially mentioned:

Model Specs.

  • Scale – 1:7
  • Wingspan – 158cm
  • Power – from 700w to 1000w 50mm dia. Outrunner *
  • Weight – 3.1 to 3.4kg.

* Prototype had a peak power of 800w using: SK3 5045 450kv motor, 80A ESC, 5s4000 flight pack and 16x12 APC-E prop.

Could you let me know what you decided on in the end regarding motor, ESC & prop as I have a WR Hurricane, but it will be in the 4 to 4.5Kg area.

Brian Seymour21/04/2017 19:47:11
136 forum posts
422 photos

Cheers Chris, the WR Hurricane is a cracking model, I have got the similar size and weight VQ Models Hurricane 60. The power setup on my VQ Hurricane was cobbled together from various parts that I had kicking around and come out at 1300w: Turnigy SK3 5055 430kv motor, Hobbywing HV70A ESC, 8s3300mAh flight pack spinning up a 13x8 APC-E prop.

On this Macchi I'll be using an AXI 515kv motor, Hobbywing 60A ESC, 5s4000mAh flight pack and I'll prop it to give as close to 50A as I can.

Brian Seymour03/01/2018 14:14:18
136 forum posts
422 photos

I have, at last, been able to get back to the Macchi, she shouldn't take much effort now.

The gear wells, doors and underside fairing are the current work in progress.

The doors which stick to the oleos (for want of a better description) were quite flexible so I glued a strip cut from the scrap ladder left over from the hard 1/16" balsa to stiffen them up a bit. I used them as a template for cutting the wing skin for the wheel wells.

gear doors stiffened.jpg

In hindsight, it may have been best to complete the underside fairing and get it smoothed out nicely before cutting the wheel wells but this way is working out.

With the sin cut, the oleos were fitted to the retracts and the innards of the wing and fuselage were Dremmel'd away to accommodate the oleo and wheel.

gear leg in well.jpg

gear well 1.jpg

gear well 2.jpg

With the well made deep enough to accommodate the oleo and wheel the fairing was built up with a couple of laser cut parts and some chunks of off-cuts. On the original one most of the underside fairing was filer which was OK but I'm guessing that it came out heavier than balsa and considerably weaker.

The chunks of balsa were trimmed to accommodate the gear door and sanded to blend in with the surface profile of the gear door.

gear door overlay1.jpg

 
The inner gear doors have been made from medium 1/16" sheet laminated with the top sheet grain inline with the length of the fuselage and the grain on the underside sheet going inline with the span of the wing.
gear door overlay 2.jpg
 
The fuselage skin was trimmed to the profile of the inner gear door and the gear door sanded to match the profile of fuselage skin.
 
Next job is to get the left hand side done the same and then get some filler into the gaps and final sanding.
 
 
Paul Johnson 403/01/2018 21:55:16
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631 forum posts
430 photos

Looking good Brian, I like the doors. How do you intend to operate the inners?

Brian Seymour04/01/2018 14:09:09
136 forum posts
422 photos

Cheers Paul, on the original model I used 5g servos to operate the inner gear doors but on this one I'll try a little trick that my flying buddy Graham Stone uses. His trick uses a spring to hold the door open, the door is connected to a lever via a push rod and the retracting wheel hub to presses onto the lever which closes the door. With a bit of adjustment Graham gets the timing of the door closing really nice.

Ron Gray04/01/2018 15:58:03
769 forum posts
200 photos

Take a tip out of the FMS book, the inner doors are held open by a piece of thin spring wire which the UC closes against and thereby pulls the doors closed. I'll the some shots of my T28 later to show you how it's done, but it works really well.

Chris Walby04/01/2018 20:22:48
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406 forum posts
65 photos

Brian and Ron, please share your tips as I have a model that no matter how I adjust the doors I can't get the things to shut!

Thanks in advance wink

Ron Gray04/01/2018 22:26:25
769 forum posts
200 photos

I took some photos plus a short vid of the retract gear on my FMS T28 this evening

img_3023.jpg

img_3024.jpg

Edited By Ron Gray on 04/01/2018 22:28:59

Brian Seymour06/01/2018 10:34:18
136 forum posts
422 photos

Cheers Ron, that's similar to what I'm going to do, it's brilliant in it's simplicity. The real Macchi C.202 also appears to use the retracting wheel to pull the door closed, Ill see if I can scan in a picture.

I'll document what I use as I make it, it will be nice to copy the mechanism from the real one but I may simply go for simplicity.

Brian Seymour06/01/2018 23:11:06
136 forum posts
422 photos

This is a diagram of the inner gear doors on the real plane from a truly excellent book "The Macchi MC.202 Folgore, a Technical Guide" by Maurizio Di Terlizzi.

20180106_215443.jpg

In the meantime a few bits and pieces on the fuselage have bee done.

The front underside of the fairing has been filled and sanded. I used Bucks Composites fairing compound with 30min epoxy, this is first time that I have used and it exceptionally good. It really can be sanded to a feathered edge without crumbling and it sands easily.

fairing filled 2.jpg

fairing filled 1.jpg

The oil cooler and radiator have also been started, both are used to help move air around to aid motor cooling. The oil cooler has an air dam half way along to channel air from the front into a duct which leads to the front of the motor and the rear draws air out the fuselage from behind the motor. The radiator has an air dam at the front and is used to draw air out of the fuselage.

The oil cooler is a supplied vac formed component but to make it aid cooling a little prep has to be done. First off the fuselage skin was cut to allow air to flow in and out. The air dam is made from off-cut balsa, a basic rectangle was cut and then trimmed to fit inside the oil cooler and then a slot was cut in it to fit over the fuselage keel. After a bit of trial fitting and fettling it was glued to the fuselage formers exposed through the duct holes.

oil cooler brace and aperture.jpg

The radiator is built up from balsa, the assembly starts with laminating the sides and sanding the external profile. The sides are then glued to the box section inside the fuselage. Once the radiator sides are glued in place an air dam is cut from scrap and glued into position and then scrap balsa can be cut to shape and fitted around them.

radiator inside.jpg

radiator outside.jpg

Next job is to sheet the radiator and glue the oil cooler on and then blend them into the fuselage with sweet fairings.

Brian Seymour08/01/2018 13:58:02
136 forum posts
422 photos

The sheeting on the radiator was up next, cross grain sheet was chopped from hard 1/8" balsa, butt joined, and sanded. The curve is quite drastic for hard balsa so water was liberally brushed onto the external surface and left for a few mins to allow the balsa to absorb it. The wet balsa was most compliant and the skin was stuck on using CA. Once set the wood was dried out using my filming iron.

Wit the air dam fitted and the duct slots cut in the fuselage, the oil cooler needed little more than gluing in position. I used a combination of gorilla glue and CA to stick it on. I used the Gorilla glue on the gappy edges (where I had cut the a bit too much off when I liberated it from the scrap) as well as on the air dam to ensure that it was sealed. For those who have not used Gorilla glue, it expands as it sets.

A reasonable batch of epoxy and fairing compound was mixed up for the radiator, oil cooler, and wing trailing edge fairings. Before applying the filler mix the wing was fitted to the fuselage with cling film around the trailing to isolate it and prevent the filler mix from gluing the wing in place.

Once the filler had set, the wing was removed, the cling film discarded, and fairings sanded.

Radiator Sanded lhs.jpg

Radiator Sanded rhs.jpg

Front Lower Wing Fairing.jpg

As I was in the mood for fitting fairings I stuck the cockpit fairing on. With the cockpit fairing on it seemed rude not to apply a bit of effort to the cockpit itself: the cockpit aperture was cut from the skin, the floor glued in, and the cockpit prepped for fitting.

Canopy and Fairing.jpg

The masking tape and paint were used visualise where the vac formed canopy should be cut - possibly not the best the method but its looking OK. The razor plane inside the cockpit is holding the cockpit floor in place as the glue goes off.

During the summer I had a go at making a 3d printed tail wheel and leg:

3d printed tail wheel.jpg

The tire is 3d printed rubber which took a bit of effort to get the right settings, the pivots and axle are Ø2mm steel pins running inside PTFE tubes. There is a bit of spring in it but I haven't finalised making it castering or steerable yet.

Next up will be a run of fairing compound around the cockpit fairing and balsa lining on the back of the cockpit and then covering.

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