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Member postings for Martyn Johnston

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

Thread: Sig Demoiselle Build Log
26/05/2015 15:09:00

One of the blokes at the field shouted out "you're very brave flying it for so long in that wind".

I said " I'm not brave:- I'm just too scared to land ! "

26/05/2015 15:07:24

Finally got round to flying it.

There was no wind at all when I set out but just a little bit by the time I got to the field.

And 'just a little bit' is quite a lot with this plane.

It looked absolutely beautiful flying slowly, slowly round the patch. I flew it figure-of-eight round the field cos I was worried I'd never get it back if I went too far downwind.

Beautiful, beautiful.

demoiselle maiden.jpg

Edited By Martyn Johnston on 26/05/2015 15:07:35

Thread: Birds Dynamic Soaring.
19/05/2015 10:19:42

Great video; looks fun.

The swallow was doing exactly that. But he was staying closer to the ground all the way round the circle, and his circle was lower, ie more below the ridge than above.

18/05/2015 13:42:58

Does anybody out there know of any birding web sites that might be interested in this?

I wouldn't know who to report it to.

12/05/2015 15:39:51

I've read about Albatrosses using Dynamic Soaring effects while flying along waves, but I've not read of any other birds known to use Dynamic Soaring.

I write because I've just been watching a swallow circling above and below the ridge, on the 'back side' of the slope in a manner EXACTLY like model gliders fly when Dynamic Soaring.

It was blowing at least 40-50mph at the top of Rushup Edge in Derbyshire. The swallow was flying a big big circle, and as he came up above the ridge level he hit the faster air and turned back downwind and went round again. The speed was astonishing. I watched him do at least half a dozen circle before he dusappeared.

Is this a known thing that birds do?  Has this ever been noticed before ?


Edited By Martyn Johnston on 12/05/2015 15:40:53

Thread: Disaster in Nepal
28/04/2015 08:51:44

The best place to donate is probably the 'Disasters Emergency Committee'.

Their web site is here


Thread: Second hand 'Super Ava'.
20/04/2015 13:32:58

Thanks Andy. Will contact him.

In the meantime I've also found a 'Reichard Cirrus F5J' for sale.

Still a lot of money, but considerably less than the 'Super Ava'.

I've never seen one of these before.

Anyone out there got any experience with either, or both?

How do they compare?

Thread: Flying Alone
17/04/2015 12:14:37

I go a walk on my own, I go up stairs on my own. I even drive on my own sometimes !

Thread: Second hand 'Super Ava'.
16/04/2015 16:16:24

I've been looking for a large, floaty, electric thermal glider for a while now.

I've been offered a 'Super Ava', but it's rather expensive; I've no doubt it's well built and well looked after.

It's not the newer 'Pro' so it might be a bit old.

Anybody got any experience with these things?

They do look fun to fly (on a warm, gentle, windless day).

Thread: Need to crop a plan PDF ...
15/04/2015 15:04:40

Have you ever used 'CutePDF' ? (link here).

It creates a virtual ('pretend' printer, called 'CutePDF'.

You can then print ANYTHING to a PDF file.

Works brilliantly.

Edited By Martyn Johnston on 15/04/2015 15:04:57

15/04/2015 14:07:12

Most (many?) modern printers have a 'Poster' option in the settings.

This will allow you to print the entire sheet on smaller pages. The intention is that you can then Sellotape all of the pages together.

Or this excellent website does it for you **LINK** Any image, any size. You could cover your wall with your favourite photo.

Thread: Scroll saw advice
03/03/2015 13:11:08

I bought the little baby 'Proxxon DS 115/E' one from Axminster tools, but it was a bit feeble.

So I swapped it for the bigger Proxxon DSH2 model (link here), and I love it.

I use it on the slowest speed. Don't see any need for variable speed at all.

Brilliant tool. The 'only' downside is that it's a bit fiddly to change the plain-end saw blades; if you only use the pinned-end saw-blades then it's fine.

I think that a scroll-saw is the same as a fret-saw (probably one of them is an Americanism).

Thread: Sig Demoiselle Build Log
02/03/2015 10:41:14

And one with the little man up front.

Cardboard cut-out pilot looks a bit basic, bit still adds a little 'life' to the model


03/02/2015 09:46:50

Full test assembly.rigging6.jpg

03/02/2015 09:46:22


03/02/2015 09:46:08

In this photo, the black lines to the ends of the elevator and rudder are for show only. They're a very loose piece of black elastic thread.

The actual pull-pull lines are a fine monofilament fishing line type stuff, almost invisible.rigging4.jpg

Edited By Martyn Johnston on 03/02/2015 10:18:14

03/02/2015 09:45:42

Like this.


03/02/2015 09:44:47

Fiddly; you need steady hands, plenty of time, and a clear workspace.

This picture shows how you thread a fine piece of fishing line through the aluminium tube and back again to create a loop. You then thread the black elasticated thread through this loop and pull it through the tube.


03/02/2015 09:42:33

Never tried rigging before, but it's quite fun to do.


12/01/2015 09:38:14

Tailplane fitted, with pull-pull lines for both elevator and rudder.

tailplane fitted.jpg

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