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Building my new Fournier RF-4

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Stephen Grigg18/11/2010 21:00:43
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So in the December RCMand E isa list of Peters models and kits to go with them,thats handy.
Peter Miller19/11/2010 08:05:29
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I think that is just a some of them. I am pretty sure that there are more.
Peter Miller23/11/2010 18:36:23
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After a time here are a few more pictures.
 



THis shows how I made the wing fairings, mostly 1/64 ply except the triangle at the rear.
 
Very similar to TIm's on the Courier but not as neat.
 

This is the dowel reinforcement for the fin.
Peter Miller23/11/2010 18:39:49
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Today I spent a lot of sweat starting to make the cockpit canopy.
 
First take a big block of pine. I had to laminate mine.

Then shape it with a power plane (£12 from Aldi a few years ago!)

Then shape up with the good old Surform.

And while we have it in the workmate make a deep slot in the bottom. A future posting will show why that is important.

Tim Hooper25/11/2010 10:04:34
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Posted by Peter Miller on 23/11/2010 18:36:23:
 
Very similar to TIm's on the Courier but not as neat.
 
 
Flatterer!
 
I'm very interested in your canopy moulding technique, Peter.  Once again, it's something that I've always shied away from, so I'll be watching with interest!
 
tim

Peter Miller25/11/2010 18:57:28
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Now the actual moulding  of my canopy.
 
This technique is called the drape method.
 
The pattern is large and cold so should be heated in the oven, Gas mark 1 for about 15 minutes. This stops the cold pattern cooling the plastic as the moulding is made.
The hot pattern is mounted in a workmate.
 
 
The plastic needs to be about 1/2 mm or just a bit more. the larger the moulding the thicker the sheet. It is clamped firmly to strips of hardwood. I even stuck mine down with CA.
 

The plastic is heated. Here I am using a gas ring. NOTE use gloves. The ring is not on for this photo. Heating has be even all over and the plastic has to be very floppy. This takes experience. If the plastic is not hot enough it can be reheated for another attempt.
 

 
The hot plastic is draped over the pattern. This is my second attempt. A bit too hot on one side but OK. Note gloves. Note that the pattern started to separate in the oven. Never mind, it will look good at 50 feet in the air.
 

This is the canopy just after removing from the pattern.
 

And trimmed up to fit the model.
 
The finish depends on the finish of the pattern. Mine is not brilliant. A coat of fuel proofer will help inside.
 
Smaller canopies are easier. You make the pattern in the same way. Then you take a piece of plywood well over the size of the pattern and cut a hole the same shape as the pattern buy with a little clearance . Radius the edges of the hole.
 
Clamp the plastic down firmly and heat evenly. When floppy press the pattern through the hole.
 
I once knew a modeller who didn't clamp the plastic down but put it into the oven to heat. The sheet of 0.030" X12" X 8" plastic came out 2" X 1 1/5" X 1/8" thick!!!
 
Peter Miller25/11/2010 18:59:43
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Bye the way. K&S do various thicknesses of plastic suitable for moulding. I use 0.030" Buy a couple of packets at least. You will ruin one or two sheets getting the knack.
Tim Hooper26/11/2010 12:33:04
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Thanks Peter!
 
I've been looking at the pop bottle method too, and I'm wondering if either method has any particualr advantages.
 
tim
Peter Miller26/11/2010 18:15:33
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The pop bottle system works very well for soem shapes of canopy. I have done a very big canopy with a gallon bottle but the ribs showed up.
 
Things like a B-17 cockpit and turrets etc are best done with the pattern and ply cut out method. Smaller bubble canopies are the same.
 
It is a case of using the best method for the job  and that is a matter of experience.
 
I cover windows and moulding in detail in "Essential TIps and Techniques" Vol One published by Traplet Publications.
Peter Miller02/12/2010 12:12:22
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Well, a bit more progress.
 

A very simple cockpit, just a panel and a pilot. The panel isn't scale in layout.
 
 The pilot is one of my Assagai pilots, just about the best pilots you can buy, only on Ebay. Note, even the teeth on the zip are modelled.
 

 

The cockpit has just been stuck down with canopy glue and held with four screws.

The SC 30FS installed. I am sure that most of it could be hidden but I like plenty of access on the field. If you haven't got it, you will need it. The spinner is in the post to me!
 

The radio installation is simple. Battery under the tank, Rx wrapped in bubble wrap and strapped down. 3 Supertec MiniL servos. The ailerons are operated by 9 gram metal geared servos with 100% differential, i.e. lots of up and almost no down.


Edited By Peter Miller on 02/12/2010 12:12:53

Peter Miller08/12/2010 18:26:40
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Finished at last.
 
 THis shows the outrigger made from a kitchen cleaner tube. Also shown is the servo hatch.
 

Logo and flag on the fin by BMD GRaphics. They put on some extra research to find out just what it was.
 

The fuselage registration by BMD GRaphics.
 
 
Now theysay that Sunday will be fine, sunny and mild with ow wind speeds.
 
Hollow laughter.


Peter Miller08/12/2010 18:35:41
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Final figures.
Wing area 481 s. in.
Weight 60 ounces. 
Wing loading 19.55 sq. in. per square foot.
Power .30 FS
Span 74"
 
Tim Hooper09/12/2010 10:47:56
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Wow!  A sunburst finish!
 
Looks great Peter.   Is your strip covered with snow at the moment?
 
tim
Peter Miller09/12/2010 11:19:15
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No, No snow here. We only had a couple of inches but I don't go flying when the temperature is below about 5C and it has been for at least two weeks
Tim Hooper19/12/2010 16:11:57
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Posted by Peter Miller on 09/12/2010 11:19:15:
No, No snow here. We only had a couple of inches but I don't go flying when the temperature is below about 5C and it has been for at least two weeks
 
 
.........and now it's about -5°C.................
 
tim
Peter Miller19/12/2010 18:35:47
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We have the snow now and it has been -8 for the last couple of nights and never climbed above freezing all day.
 
Luckily I am stocked up and can last for two weeks without going out...much to the disgust of my next door neighbour. I seem to provide her transport a lot of the time along with a lot of other people.
 
I shall spend Christmas drawing up three now plans. One for RCM&E. Well, they have one on file, one waiting to be sent in. Then building furiously for a few weeks.

Edited By Peter Miller on 19/12/2010 18:36:25

Tim Hooper19/12/2010 20:19:30
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You, sir, are indefatigable!
 
tim
andy watson19/12/2010 20:26:44
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Been quietly watching Peter, and really like it.
 
When will it be in the mag?  (Not that I don't have a list!)
Frank Skilbeck19/12/2010 20:45:28
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Posted by Peter Miller on 19/12/2010 18:35:47:
 
Luckily I am stocked up and can last for two weeks without going out...much to the disgust of my next door neighbour. I seem to provide her transport a lot of the time along with a lot of other people.
 

Edited By Peter Miller on 19/12/2010 18:36:25

 

Good to hear you have lots of balsa in......................
 
Fournier looks really nice. 
Peter Miller20/12/2010 09:02:57
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Hi Tim. That's me. Work like heck and then burn out for a few weeks. I just replaced three windows, now I need to get enough to do the front windows. no double glazing in these old cottages and last night it was -12 outside.
 
Andy: There is a biplane coming first. The Fournier has not been test flown yet and it looks like it will be a while before the weather allows that, I need warmth (comparative) and bright sunlight and blue sky. A couple of Sundays ago it was cloudy so I didn't take the model. Then the sun came out. $%"&****! Anyway. probably be sent in to the mag within a couple of months.
 
Frank.  Oh yes, I have good stocks of wood and everything else needed., I like to be able to build anything I want without waiting for materials. I shall have to put in a big order to SLEC soon though.

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