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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: New EDF Mini Jets- Jet Provost & Folland Gnat
06/03/2020 14:04:42

Hi Tim.

That reading was with a part used battery so probably a bit down on power.

06/03/2020 12:26:23

A bit of good news, or should I say, less bad news.

Leaving the fan unit in situ, I have wired in another ESC and am getting full throttle (32amps 350watts).

So.... a bad ESC.

Just need to dig it out and replace it.

Tricky, now the side inlets are glue on, but better than having to remove the fan unit.

Thread: Geoff's Jet Provost - Build Log
06/03/2020 12:25:43

A bit of good news, or should I say, less bad news.

Leaving the fan unit in situ, I have wired in another ESC and am getting full throttle (32amps 350watts).

So.... a bad ESC.

Just need to dig it out and replace it.

Tricky, now the side inlets are glue on, but better than having to remove the fan unit.

Thread: New EDF Mini Jets- Jet Provost & Folland Gnat
05/03/2020 11:42:26

Here's my Provost.

img_4704.jpg

Here's something weird and rather annoying.

Before I installed the EDF unit I ran it up to make sure it was working, but not up to full power, and all seemed OK.

Now that it is all finished, it's time to test the thrust that I am getting. So I put the model nose down on my scales and ran up the motor. I got to about 300g of thrust at just over half throttle and then the motor stopped. Tried again and anything over about half throttle and it stops. For the third attempt I wired in my power meter to see what was going on.

I found that it was getting up to 58amps at about 700watts and then cutting out, accompanied by a faint smell of hot electrics. The fan seems to be turning freely and I am using a 3s 2200mah battery and 40amp ESC.

I need to do some more investigating but does anyone have any ideas.

What sort of amp draw are you guys getting at full throttle?

It is the 50mm FMS (3s) edf unit.

Thread: Geoff's Jet Provost - Build Log
05/03/2020 11:39:00

Here's something weird and rather annoying.

Before I installed the EDF unit I ran it up to make sure it was working, but not up to full power, and all seemed OK.

Now that it is all finished, it's time to test the thrust that I am getting. So I put the model nose down on my scales and ran up the motor. I got to about 300g of thrust at just over half throttle and then the motor stopped. Tried again and anything over about half throttle and it stops. For the third attempt I wired in my power meter to see what was going on.

I found that it was getting up to 58amps at about 700watts and then cutting out, accompanied by a faint smell of hot electrics. The fan seems to be turning freely and I am using a 3s 2200mah battery and 40amp ESC.

I need to do some more investigating but does anyone have any ideas.

What sort of amp draw are you guys getting at full throttle?

It is the 50mm FMS (3s) edf unit.

01/03/2020 11:34:15

I have had a weigh-in, I always hate this bit.

Total weight without battery is 612g.

With a 2200mah battery weighing 180g, it needs 30g of nose weight to balance.

Giving a total of 822g or 29oz.

I have ordered a couple of 2700mah which weight 235g and should mean I won't need any nose weight.

This would give an AUW of 847g or 29.9oz.

Sounds a bit heavy.........again angry 2

27/02/2020 23:47:05

Yours also looks great David.

I have also been playing with Fusion360. My first attempt weighs in at 16g unpainted, which I think may add too much weight.

I haven't figured out attachment yet but my feeling is to make them detachable in case they adversely effect flight.

Maybe magnets or simply friction fit.

Keep us posted how you get on.

Geoff...

26/02/2020 21:31:08

All done.

img_4700.jpg

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Has anyone added tip tanks to theirs?

22/02/2020 20:10:47

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!

20/02/2020 20:59:05

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

Printed some control horns.

img_4685.jpg

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

img_4689.jpg

This is how I add letters and numbers.

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Nearly there!

More later...

Thread: Cheap Chinese Laser Cutter
19/02/2020 22:57:27

Hi Adrian.

Glad to have been of any help.

I use a Dremel for my routing and these are the bits that I use - I have been using the 1mm bit.

Geoff...

Thread: Geoff's Jet Provost - Build Log
04/02/2020 17:42:33

I have cut out the side cheeks.

img_4678.jpg

And the canopy is waiting for the glue to cure.

img_4683.jpg

img_4682.jpg

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...

31/01/2020 21:58:00

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

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More later...

29/01/2020 20:24:38

Today's update.

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More later...

28/01/2020 21:39:49

Wings are on and hatches cut.

img_4652.jpg

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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...

24/01/2020 20:20:30

I think I am about there with the shaping:

img_4643.jpg

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More later...

24/01/2020 11:58:36

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.

21/01/2020 15:18:49

Top sheeting added.

img_4641.jpg

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:

img_4633.jpg

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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.

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