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Fournier RF-4

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EarlyBird13/10/2020 12:41:23
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515 forum posts
375 photos

Thanks Peter.

This is as far as I have got

img_20201013_111901063.jpg

Former positions measured and marked on the inside of the fuselage sides.

I then test fitted and found that more adjustments are required. So I will take it apart again. Looks like this is going to be an iterative process unfortunately the number of iterations is unknown I just hope it is not hyperbolic.

Cheers beer

Steve

EarlyBird13/10/2020 21:41:46
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515 forum posts
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So it's been a long day. I could not get the formers to fit so after a few attempts I gave up my only thoughts being that there has to be more to life than this. Of course there is, flying for one if only I could.

Feeling totally down in the dumps suddenly idea it came to me. Take it all apart again, groan! not again!, and fit the formers individually to each side laid on the bench. With a little bit of trimming and a couple of packing pieces it all came together quite easily. smiley

So all of the formers are ready. I have put guide pins in and started gluing at last.

img_20201013_202255681.jpg

Only two formers as these two will fit with the fuselage flat on the board wedged in the jig(?)

Well the plan looks to be working, which always makes me happy party

If I wasn't tea total I could have a beer or two. thinking hm the thing is I am not tea total as I don't like tea but saying coffee and water total just doesn't sound right.

A thought occurred to me while struggling with getting the formers to fit. Why did I expect it all to just fit perfectly it never does.

Making it fit together is part of the fun.

Cheers tea

Steve

Peter Miller14/10/2020 08:15:22
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You know, there is an answer.

When you get totally hacked off just say what I did many, many years ago (1955)

"To Hell with this!! I will design my own!!"

EarlyBird14/10/2020 08:53:08
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515 forum posts
375 photos

Peter you keep making me laugh which cheers me up not end, thank you. smiley

It's not the design it's just that I expect laser cut parts to fit perfectly and thought maybe others are of the same mind so I was making a point that could be helpful to others. 1955 I was three so I think I was a bit young to start designing and now too oldlaugh

Cheers beer

Steve

Fun Flyer14/10/2020 10:00:50
357 forum posts
59 photos

I think everyone hits a wall at some point with every build. I found the wings to be a challange but yours seemed to just slip together. Keep going. The RF4 is well worth persevering with.
1955, that's nothing. I was at school in 1955!

Peter Miller14/10/2020 11:18:48
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Try putting the laser cut parts on the plan and see how far out they are. You might just be surprised that they fit the plan.

Too old to start designing? CODSWALLOP!

EarlyBird14/10/2020 11:43:50
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515 forum posts
375 photos

Yes they fit the plan surprise

But the formers are cut at a right angle so need sanding to the angle of the fuselage side. Then I found that the triangle stock varies along its length forming a taper towards one end. I got around that by adding thin bits a scrap packing. We are only talking in terms of 1/32".

Are you shouting and swearing?surpriselaughlaughlaugh

As I said to the doctor 'it only hurts when I laugh but that does not happen often'

Peter you do make it so much more fun.

I have fitted one more former so I am doing well today frown

Cheers beer

Steve

Peter Miller14/10/2020 12:02:34
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Posted by Fun Flyer on 14/10/2020 10:00:50:

I think everyone hits a wall at some point with every build. I found the wings to be a challange but yours seemed to just slip together. Keep going. The RF4 is well worth persevering with.
1955, that's nothing. I was at school in 1955!

I joined the RAF at the end of 1955

EarlyBird14/10/2020 12:09:13
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515 forum posts
375 photos

Now that I have found my phone here is a picture.

img_20201014_115727068.jpg

Cheers beer

Steve

Geoff S14/10/2020 12:38:15
3907 forum posts
62 photos

Never fear, the fuselage will go together somehow even if you need to 'modify' the formers (even CNC cut ones) slightly.

One thing I wouldn't be without is my SLEC fuselage jig which allows me to dry assemble and hold everything together without its falling apart as soon as you let go of it. I've built loads of fuselages with mine (and even a boat hull - my Thames sailing barge) and it's gettiing a bit tatty.

I'm having similar problems with the CNC parts for my Peter Miller Li'l Cub (it's a strange shape too) as you can see here.

fuselage 5.jpg

It makes building a lot easier. It's all glued together here but I set it up dry and those lines help to get it straight.

Geoff

Peter Miller14/10/2020 13:27:38
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That is looking very good STeve.

I ahev to say that as far as I can remember no one else complained about the fuselage

Edited By Peter Miller on 14/10/2020 13:29:01

EarlyBird14/10/2020 20:44:29
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515 forum posts
375 photos

No complaints here either Peter just observations that demonstrate my ineptitude. If I had spotted that one of the triangular strips was tapered before I glued it in place then I would not have used it and there would have been no problem. A simple case of inexperience.

No problem really and I have learned a lot, which is the main thing.

I have four formers and the wing bolt plate fitted.

That has taken me two days.

It's a good job I am not on piece work and that I have plenty of free time.

I won't be taking on any commissions any time soon at this rate.laugh

Cheers beer

Steve

EarlyBird14/10/2020 20:59:23
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515 forum posts
375 photos

Geoff

Yes I have considered that jig but I don't know if I will be building anymore models.

I thought that with the Ballerina and here I am building another one.

I was warned that building is addictive, hmmm mixed tenses there.

So what I am going to do is follow your suggestion and buy one for when I start The Ohmen. Hang on I must be addicted laugh oh no smiley I do not need any more, I do not need any more.

Well one more will not do any harm will it.

Ok I have convinced myself just one more maybe.

Cheers beer

Steve

Peter Miller14/10/2020 21:02:26
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11602 forum posts
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10 articles

I suppose my problem is that I just throw the things together. and they fit by brute force and ignorance...or perhaps they don't DARE not to fit.

EarlyBird14/10/2020 21:08:19
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515 forum posts
375 photos

Ah Peter you made me laugh yet again.laugh

EarlyBird14/10/2020 21:22:24
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515 forum posts
375 photos

As you have cheered me up again here is a photo.

img_20201014_211431624.jpg

They line up surprise

I think that's a good sign. The Engineer in me tells me that it is.

Cheers beer

Steve

Peter Miller15/10/2020 08:25:34
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11602 forum posts
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There you are. Told you that it would work!!!

Now you think you have problems.

My current design will not fit on one side if a plan sheet but will not fill two sides. So is not going to be used. Not a problem in its self.

Now I think I will scale it up a bit and that might be used or design two small models each to fit in a single side of a free plan sheet.

Ron Gray15/10/2020 09:01:53
2459 forum posts
996 photos

Peter, you know that bigger is better😜

Peter Miller15/10/2020 09:14:06
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11602 forum posts
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10 articles

Not in these days with the potential shortage of balsa or price increaselaugh

kc15/10/2020 12:22:47
6780 forum posts
174 photos

Peter, what about a low wing fuselage to fill the empty part of the plan? Same wings and two alternative fuselages?

But personally I prefer models in the 50 inch span range and thats the size of plan that would tempt me to buy RCME. Could be that size of the plane affects sales.

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