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Member postings for Geoff Gardiner

Here is a list of all the postings Geoff Gardiner has made in our forums. Click on a thread name to jump to the thread.

Thread: Geoff's Jet Provost - Build Log
21/01/2020 15:18:49

Top sheeting added.


More later...

20/01/2020 21:39:22

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:






Lots of shaping and sanding next...

20/01/2020 16:59:42

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.

19/01/2020 21:19:13

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




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


More later...

17/01/2020 20:29:12

Bit more done today.






More later...

16/01/2020 20:27:26

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.





Glued the wing sections together.


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.


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.


More later...

Thread: Home Made CNC/Laser Cutter
14/01/2020 12:04:58

Hi Adrian.

I have the pwm/ttl from the laser connected to z+ (end stop) on the cnc shield.

Power for the laser is taken from the cnc shield. I initially used the psu that came with the laser but this didn't work because both laser and shield need to share the same ground, and I found that the laser would just stay on.

Hope that helps.

Thread: Forum 2020 Mass Build discussion.
07/01/2020 14:13:56

I have all the bits for the Provost, Gnat and Hunter.

Just need to decide which one to start first.

Thread: Oodalally - Build Log
04/01/2020 22:27:59

Sods law - weather looks ok tomorrow but I have others things that I have to do angry 2

It has been a very enjoyable build and went together quite quickly - thanks Peter for the design.

04/01/2020 12:57:10

Better lighting.




03/01/2020 22:44:16

Hi Gary.

I used Adobe Photoshop to design the scheme and Silhouette Studio to send the files to my cutter.

Set up the CofG this evening. It balanced with moving the battery - no extra weight needed.

Flight report next, pending some fine weather.

03/01/2020 18:16:02

I have just done some measurements which are as follows:

Motor - E-Flite Power25 870Kv

Battery - (a rather large) Zippy Compact 6200mah 4 Cell Lipo

All up weight including battery - 2.16 Kg

Prop - 11x7

Power - 750 W @ 48 A at full throttle.

02/01/2020 12:24:01

Tis done...

Bit of a gloomy day but here are some pics.






Just need to set the CofG and wait for good weather.

01/01/2020 20:10:51

Thanks gents. I'm nearly there!

Fitted the ESC and SBEC.



And sploshed a bit of paint on my 3d printed pilot.


More later...

30/12/2019 21:24:41

Bit more done.

Cut some vinyl decals with my silhouette portrait cutter.





Glued on the tailplane.


Added an infill piece between the elevators.


Added some carbon tube and glued on the fin.


Made a windscreen and printed a pilot.


Added some exhaust stubs.



More later...

Thread: Which Laser cutter
16/12/2019 16:11:51

If you have a dremel you can build one of these and have the best of both worlds.

Thread: Cheap Chinese Laser Cutter
15/12/2019 18:38:20

I have installed an extension into Inkscape called - J Tech Photonics laser tool (free download).

This produces the G-Code to send to the laser via CNCjs.

15/12/2019 11:12:37

Hi Andy.

Are you powering your laser with a separate power supply. If so, you need to make sure they share the same ground connection. I had similar issues with mine which I fixed by powering everything from one power supply.

Hope that helps.

Edited By Geoff Gardiner on 15/12/2019 11:14:36

Thread: Oodalally - Build Log
13/12/2019 21:23:43

I covered the cowl today and sorted the battery hatch, with the aid of my 3d printer.



More later...

11/12/2019 19:50:29

Thanks Chris.

Working on the fuselage today.



More later...

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