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Geoff's Jet Provost - Build Log

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Geoff Gardiner16/01/2020 20:27:26
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455 forum posts
817 photos

I have the Vac form bits for the Gnat, Hunter and Provost. I also have three FMS fans. So after much deliberation I have decided to start with the Provost.

I have cut out the parts using my Laser/CNC cutter.

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Glued the wing sections together.

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Started on the fuselage. For some reason they cut 10mm too short on the X axis, I may need to check calibration of my stepper motors.

I chose to splice a 10mm strip into each side rather than re-cut them both.

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I cut former 6/7 as a single piece then cut out part 7 and tack glued it back on. I am not sure how useful this will be if I need to replace the fan at any point because the hatches are all in front of the fan - so you are still going to need to hack away a portion of the fuselage, at which point you could probably loosen the hot glue securing the motor and pop it out the front of the former.

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More later...

Geoff Gardiner17/01/2020 20:29:12
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455 forum posts
817 photos

Bit more done today.

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Geoff Gardiner19/01/2020 21:19:13
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455 forum posts
817 photos

Made up the thrust tube and hot glued in the fan.

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Added the bottom sheeting. I will steam the front bit to get the slight curve required.

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More later...

barry grubb20/01/2020 15:32:26
2 forum posts

Hi Geoff.

I have been thinking about this same project. As I am new to laser /cnc milling I was wondering if you could talk me through the steps you have taken to produce the Gcode files from the raster plan. Or have you sourced the files from elsewhere?

Geoff Gardiner20/01/2020 16:59:42
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455 forum posts
817 photos

Hi Barry.

I am working with the free plan that came in the magazine.

The programs that I use are all available to download for free (I use mac versions):

Inkscape - for tracing out parts (I use the bezier curve tool)

J Tech Photonics laser tool - an extension that you load into Inkscape which produces the gcode.

CNCjs - for sending the gcode file to the laser cutter.

If you have a look at my Oodalally build log here, I have gone into a bit more detail.

The only difference here is that I did not have a PDF of the plan to start with so it was a case of scanning each part from the plan. One thing to note is that Inkscape works in a resolution of 72dpi. So you must scan at that resolution otherwise the scale will change (ask me how I know angry).

Hope that helps.

Steve Nash 120/01/2020 20:39:05
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43 forum posts
11 photos

Hi Geoff,

looks like a nice neat build coming along there.

I love the CNC cutting equipment, just a bit beyond me I think. I have built the Provost too but had to use my trusty bandsaw and scalpels for cutting out. Started on the Gnat now as well. The equipment you have would be a great help for some of the parts of these jets as they are a bit fiddly and delicate to cut by hand, just have to take it slow.

I'm thinking of getting one of the SLEC building board kits like you have. Are they any good?

I use a magnetic building board at the moment with modified lego blocks that are very versatile as they are infinitely adaptable.

Steve

Geoff Gardiner20/01/2020 21:39:22
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455 forum posts
817 photos

Hi Steve.

Your Provost looks great - hope mine turns out as good!

I find the SLEC building board really good, it's stops me building banana shaped fuselages. I have mine stuck to an off-cut of kitchen worktop.

Few Pics from today's tinkering:

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Lots of shaping and sanding next...

Geoff Gardiner21/01/2020 15:18:49
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455 forum posts
817 photos

Top sheeting added.

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More later...

Mark Winstanley22/01/2020 22:20:02
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10 forum posts

Geoff; I see our tastes are the same. As soon as I saw the parts were available on tony’s web site I ordered them for the provost gnat and hunter. My provost is at about the same stage as yours. I too spent time generating Goode to CNC cut parts and I am pleased with the way they came out. I will be doing the same for the gnat and hunter when I have the provost a bit further along. I am looking forward to first flight once the snow disappears- I am in Canada.

best of luck with the remaining construction.

Mark.

Geoff Gardiner24/01/2020 11:58:36
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455 forum posts
817 photos

Hi Mark - great minds think alike!

I have been shaping the fuselage the last couple of days but still not quite there yet. I think I can take some more off, which will help keeping the weight down.

Geoff Gardiner24/01/2020 20:20:30
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455 forum posts
817 photos

I think I am about there with the shaping:

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More later...

Geoff Gardiner28/01/2020 21:39:49
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455 forum posts
817 photos

Wings are on and hatches cut.

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I have scooped out some of the inside of the nose so as to get the battery as far forward as possible.

More later...

Geoff Gardiner29/01/2020 20:24:38
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455 forum posts
817 photos

Today's update.

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Geoff Gardiner31/01/2020 21:58:00
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455 forum posts
817 photos

Recruited a couple of pilots (twins) ready for active duty.

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More later...

Geoff Gardiner04/02/2020 17:42:33
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455 forum posts
817 photos

I have cut out the side cheeks.

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And the canopy is waiting for the glue to cure.

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On a painted model I usually fix the canopy after painting, but as I am not painting this model I thought I would try it the other way around.

I have also had to lengthen the ESC to motor wires slightly so that I could get the ESC as far forward as possible.

More later...

Geoff Gardiner20/02/2020 20:59:05
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455 forum posts
817 photos

Haven't updated for a while as I have been doing the covering which slows things up a bit.

Printed some control horns.

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Printed off a set of decals and cut them with my Silhouette cutter.

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This is how I add letters and numbers.

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Nearly there!

More later...

Steve Nash 120/02/2020 21:43:46
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43 forum posts
11 photos

Looking good, Geoff 👍👍👍

Tim Flyer21/02/2020 13:25:40
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1175 forum posts
222 photos

Well done ! Great looking plane😊👍

Stephen Smith 1422/02/2020 18:51:53
174 forum posts

Are the 3d printed fin holders your design or did you get them from somewhere else?

Geoff Gardiner22/02/2020 20:10:47
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455 forum posts
817 photos

Thanks gents. I just have the side air intakes left to fix on and then it's done.

Stephen, I designed them myself - they are actually kitchen roll holders!

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