TitleGarrison

No bird ever flew nonstop from New York to Tokyo, or raced 15 miles high at triple the speed of sound.                                                                                                   
  But birds do something else.
  They do not conquer the air; they romance it.
.”

  Peter Garrison

HoursAndCounting

Jur's RV7 Aircraft Factory
2917 hours
and counting
Some decisions in life are bare of any obvious logic

 

3. Slider Canopy

Got the windscreen out and tried to get some idea's how to tackle this trimming down process.
This is how it looks like in it's current shape.
I'll have to make some rough cuts near the front to get it to sit properly on the front top skin.
But how far can you go ?

Started making some drawings on the canopy and on the top skin.
Not ready yet to make the cuts. I have to think this over little more before I get the cutting wheel out.
Biggest question remains, how deep towards the roll bar brace do you cut back.
the plans show no clear indication for this so it's once more one of the "piece of art" decisions instead of precise measurements.
It's quite normal as no 2 canopies are the same but still it's scary to start this.

Two more days of working on the windscreen fitting.

Going little at a time, cutting small slices of the front, each time evaluating the transition to the slider canopy.
As you can see I'm already passed my initial estimated line on the front top fuselage skin. Now at the line of the rivets in the top skin and still a bit of a bump up on the slider.

Some shots of the look so far.

I'm not really focusing on the sides yet, just checking the center as this decides the final slope.

Here's a shot when closed. You still see the kind of V-shape formed by the edge between slider and windscreen. Guess I'll need some more trimming back.

Some time ago I made rough cuts on the windscreen and just remove the molding shape. Now I'm getting back to it and further cutting back on the front side.

The best way to attack this is by cutting back from the front center and evaluating how far more you need to go.
The way I evaluated that is by looking at the transition from the windscreen to the canopy frame. You can stop cutting back once the transiition is smooth and without a bump down.
The way I cut with the cutting disc is by making first a light pass that sets the path, then move some gentle moves back and forth going 3/4 through.
Finally I make one final pass from the edge all the way through in one pass.

As you can see, I also made some drawing on the front top skin where I think the windscreen will end up. (conservatively, because it ended up way closer towards the rollbar brace)

Another marking made, another cut, more sanding the edges and try again.

It's a try and error process that requires a lot of patience, unless you want to take the risk cutting back too far and ending up reordering your canopy and doing the whole job again.
I'm doing small sessions to stay concentrated and try not to rush this.

Still trimming back the windscreen. This task is endless. I'm very afraid of cutting too much at a time so taking it slice by slice. Still working on the front.

My cutting setup.

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Caution !

Some advice on reading my log for fellow builders !

In some articles, I made corrections at later date on the original article to rectify my own stupidities or faults. Read through the entire article if you intend to use my findings/experiences on your own project !

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It’s possible (not likely) that I’m not as smart as I think I am. (Occasionally, I have moments when I know this to be true. Fortunately, the feeling passes quickly.) Although I have tried to make this information as accurate as I can, it is not only possible, but also quite likely, that erroneous and misguided information lurks within these pages. I cannot and do not warrant these pages to be error free and correct. Furthermore, I accept no liability for the use of this (mis)information. And, as many would say, your mileage may vary. If, after reading this, you are intent on proceeding, please be aware that the contents of this site are protected by copyright (copyright © 2011 and 2012). Nonetheless, you may copy this material subject to these two conditions: (1) any information used is for non-commercial purposes, and (2) the source of the material is properly credited. Of course, you may link to any page herein. At some articles, snippets of the plans from Vans are visible. These are for educational and illustrations purposes only and should never be used as plans for part construction or assembly as plans may have changed since the picture was taken and more important they are protected by Copyright by the Vans Aircraft Mothership company.

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