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Member postings for Geoff S

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

Thread: Multiple Photos
28/09/2020 23:30:20

You can probably do it with MS Publisher. I've produced A4 prints with several photographs on in the past so if you uploaded the file that might work but I think it will need to be a Jpeg format.

However, why bother? I've never found posts with several images to be at all distracting if you space them from the text.


Thread: Rans S-9 Chaos. Peter Miller's new design blog
28/09/2020 14:44:08

It's in the magazine article and I suspect also on 4max's web site

PO-3541-1070 motor

APC 11 x 5.5 prop

On 3s LiPo with a 40 amp esc


Thread: Future balsa supplies in UK
28/09/2020 12:29:57
Posted by Matt Carlton on 28/09/2020 11:40:56:

In typical 'balsa sheet' sizes as well I see.

I wonder what 1/32" obechi wing ribs would be like.

I'm assuming that it could be laser cut just as well as balsa...

I would have thought foam board might be better?

There was a period when Correx was popular. IIRC Peter designed a model which was largely Correx - can't recall the name.


28/09/2020 11:10:30
Posted by Peter Miller on 28/09/2020 10:08:48:

Matt (an others)

Designing is easy. To start use a proven basic layout of nose length, aprox wing chord and area tail moment and CG.

This is called basic research. Then design a box from the firewall back to the trailing edge of the wing and a tapered box from there back.

After that add any cosmetic shapes you like.

THen trust what you have done and build it.

You will make mistakes but unless you actually build and fly you wil never know.

No one ever told me that it was hard so I just went ahead. Some worked, some didin't (I remember a light weight model that developed violent flutter and shook its self to bits.

Of course small control liners were cheaper and we risked less but it was the start.

I can recommend a book I have on my workshop bookshelf. It's called 'Designing Model Aircraft'. Trying to think who wrote it but ... ah yes, some unknown character called Peter Miller


27/09/2020 23:59:09

I'm a very average builder who came into the hobby quite late if life (55) but that still means, to my great surpriise, I've been at it 25 years. All my previous hobbies have been practical so I had little difficulty in building my own trainer and even my own transmitter and receiver I do have a few ARTF models both foam and balsa but I do prefer to build my own where I can and the balsa shortage is concerning especially as shed time is being forced on us all at the moment.

I've just more or less completed a DB S&S 60" ws Sopwith Pup (are scale models ever finished? Even sport scale like mine) and because I think I may be the first to do so I had quite a lot email communication with Richard Bristow ( the current reincarnation of Boddo himself) as I struggled at the start. I know he's experiencing difficulties sourcing balsa for his wonderful kits just like everyone else. As Richard Wills writes, there are all too few kit manufacturers left and, if we wish to keep having the designs and kits available for our amusement, we need to support them. There's a certain satisfaction in flying a model you've made although I hate maidens.

I'm pretty sure none of the kit manufacturers are going to become millionaires selling to us but they deserve a decent living.

I already have a few kits in stock and I intend to add a part kit of Peter Miller's Rans Chaos as soon as Sarik have them ready. I also have a small stock of balsa for repair or modification which I hope will be sufficient.

As if a pandemic wasn't enough to bother about!


27/09/2020 17:53:22
Posted by Doug Campbell on 26/09/2020 10:14:09:

There was the Regal Eagle by paper aviation. I am not sure of the materials but it involved some paper or carboard.


I haven't got a Regal Eagle but I have the similarly constructed Ezee Pezee from the same source. It's largely made from paper covered foam board that I think was (is?) intended for art/display use.

ezee 7.jpg

Not a very pretty model. In fact one of our members is sufficiently ungracious as to burst out laughing whenever he sees it

Perhaps increased demand for balsa will promote growers to increase the supply by creating new plantations. Moreover it's a fast growing plant and the light stuff we need is harvested early.  After all balsa is technically a hardwood.  I have a sheet that came from an unknown source (I certainly didn't select it) which is unbelievably hard and very heavy.



Edited By Geoff S on 27/09/2020 18:09:35

Thread: Forum members' new models: Let's see them.
26/09/2020 13:10:28

That's a beautiful model of an incredibly ugly prototype, Alan

I can see that llateral balance might be a issue but it must have been on the full size. I really can't see the thinking behind the unusual layout and what advantages it might offer that led to its design. Is that a pusher propped engine at the rear of the cockpit?


Thread: Need to adapt this part
26/09/2020 12:28:11

Could you fashion a completely new part from epoxy sheet and attach a metal collar at the end where you need to attach a grub screw either mechanically (small piano wire pins) or using epoxy (JB Weld) or, perhaps best, a combination of both?


Thread: Best interference free 2.4 tx under ?350?
25/09/2020 20:13:29

I think with most (all?) radio systems the cost of the transmitter is a relatively minor issue because you only but one. It's the cost of receivers if you have multitude models and choose to fit and leave a receiver in each one.


Thread: Ofcom trace interference to a lightbulb
25/09/2020 20:05:51
Posted by Kevin Wilson on 25/09/2020 17:49:11:
Posted by Geoff S on 24/09/2020 14:56:36:
(snip)....... I think eventually houses will be wired with a 12 dc circuit for lighting with a central ac to dc regulator/rectifier and much simpler (and probably cheaper) LED bulbs with greatly extended life.


Geoff, I work at a UK satellite TV broadcaster and wiring the buildings for DC was under passing consideration a few years back. One of my buildings is a large broadband hub and we have many DC systems at 50volt, a data centre standard evolved from GPO so I am told. Typical loading of a DC system is around 1000Amps. And that is the rub with LV DC. Low volts = big currents = big cables.
China and India are leading the way with MV DC transmission lines (yes, 1million volts) now possible by high efficiency HV semiconductor converters. hopefully they are built to a higher standard than the SMPS in domestic LED lamps.

Of course that's true if you need real power for heating etc (one reason I think our 240v mains supply is superior to the US 110v - though we had a 110 v supply at work which was rarely used). However I would think the current involved in LED lighting would be quite modest and any extra copper conductor cost would be offset by the lower energy requirements of pure LED lighting (as opposed to the current LED bulbs which need 240v ac to a low voltage dc converter in each one with the potential for EMI). In your case the energy requiremnts may well justify high voltage/low current supplies but that probably wouldn't be the case in a domestic setting.

I admit I haven't done either the maths or any research but it seems worth consideration. Vehicle lighting is also becoming more LED based. When I edited a national cycle club magazine (Tandem Club Journal) back in the late 80s I was given some LED rear lights to review (red LEDs being really the only ones generally available then) and they were brilliant both literally and figuratively. The main advantage was their reliability and low weight. The so-called Never Ready cycle lamps were notorious for intertmittent operation LED cycle lighting is now so good that motorists complain about their being too bright whereas back in the 80s the complaint was of cyclists having no lights at all.


25/09/2020 13:09:32
Posted by J D 8 on 25/09/2020 09:54:01:

What sort of bulbs were they? If you hold a fluorescent tube under a high power cable it will glow.

When I was still at school (1953 ish) I went on a visit to the Rugby Long wave transmitter facilty with a local radio club. There was a large hall-like room where the feeds to the aerial arrays left the buildings and I was amazed to see how fluorescent tubes lit when suspended form bits of string. Very useful for maintenance I suppose.

Of course it was all thermionic valves and the big transmitter power output ones had removable glass covers so that elements that failed could be repaired, the covers replaced and the valve evacuated.

All very impressive to a 13 year old and quite impressive to an 80 year old, too


Thread: Best interference free 2.4 tx under ?350?
25/09/2020 00:05:34

I doubt if there is a 'best'. All the main manufacturers work well and are relaible. I used a Multiplex 3030 for years on 35Mhz and used Frsky DiY modules as a first foray into 2.4gHz so when I bit the bullet I bought a Taranis and now a Horus, which I love.

It's like cars, they're all pretty reliable which, for me with no interest in family saloons other than as a home appliance, is prime consideration.

I would never criticize anyone's radio choice. I like the fleibility of OpenTX but to many it's too much bother and that's fine.


Thread: October 2020 issue chat
24/09/2020 23:57:42

Another good issue with interesting articles. I think the editor and contributors are surviving very well and I'll certainly continue my subscription.

I've been involved with computers for most of my life one way and another and I quite enjoy on-line content but there's something about a glossy paper magazine I wouldn't want to lose. We still subscribe to a daily newspaper as well. Perhaps it's because we're old


Thread: Forum members' new models: Let's see them.
24/09/2020 15:06:22

The SLEC (Precedent) Funfly is a great flying model. I had a couple and I passed my A with the first.

They are quite weak in the middle because of the mid-wing design. Mine had a ST34 engine and when the model blew off my stand it fell on one wing tip. There was enough inertia in the engine weight to snap the fuselage just around the wing seat where it is weakest. Quite an easy repair and I reinforced the fuselage with carbon tow around the wing seat.

Yours looks very nice, Matt and it's a good choice to get you back in the groove.

Can't recall any CoG issues with either of mine and I originally had an Irving Q40 in the first. I replaced with the ST34 because it was a bit too much for a beginner. An electric version may have problems in that regard because the electric motor is lighter than an equivalent glow engine.


Thread: Ofcom trace interference to a lightbulb
24/09/2020 14:56:36
Posted by Kevin Wilson on 24/09/2020 13:41:30:

As KC notes, with the increase in worldwide transport of electrical fittings ES27 lamps (and ES14) are not uncommon. Decorative light fittings are frequently ES or SES.

That's true now but back in 1950s and 60s they were almost unknown in a domestic setting. I much prefer bayonet fittings myself as they're much easier and quicker to fit.

A good point about LED light fittings which have switch mode regulators (and rectifiers) to convert 240v ac to 12v dc or whatever for the LEDs. I'm sure they could well generate all sorts of RF interference. I think eventually houses will be wired with a 12 dc circuit for lighting with a central ac to dc regulator/rectifier and much simpler (and probably cheaper) LED bulbs with greatly extended life.


24/09/2020 13:17:11
Posted by John Lee on 24/09/2020 11:47:49:

Full size related but it just goes to show how interference can be generated from an unexpected source. Ofcom link

That's a very strange light bulb with an ES (Edison Screw) connector. I was involved with selling light bulbs in our family electrical/radio etc shop from childhood in the 1940s onwards and all mains light bulbs were bayonet fittings. Thiis was at a time when many houses had gas rather than electric lighting (and no indoor plumbing) in our small mining town. The only screw fitting bulbs we sold were MES (Miniature Edison Screw) bulbs for torches and bike lamps.

I can only assume there was a loose connection to the filament or perhaps a mechanical connection that wasn't really secure and thus generated a spark. As Bob mentioned early radio transmitters used spark gaps to generate the RF - and that's not so long ago in real terms. I bet it was an interesting investigation and very satisfying to bring it to a successful conclusion.

On the old TV interference I'm guessing it was a valve one with a CRT which needed several kilovolts for the EHT and again the source of the interference was a spark.


Thread: Hello from Norfolk
24/09/2020 00:12:17
Posted by kevin b on 23/09/2020 23:32:20:

Welcome back Matt.

Don't they do slope soaring in Norfolk ? devil

The way the planet is going I would suggest you start building float planes !

There are cliffs at Happisburg (sp?) but they keep falling into the sea and there's some in Cromer. There's at least one very steep hill nr Holt because we had to use the granny ring on our tandem to climb it. So, despite what Noel Coward wrote, Norfolk isn't very flat


Thread: Rans S-9 Chaos. Peter Miller's new design blog
23/09/2020 19:27:15

I've been doing some minor research looking for different scale schemes for the Chaos and ended up at this Wikipedia site. Apparently Rans don't only manufacture aeroplane kits but sarted out with land yachts and, later a whole variety of both upright and recumbent pedal cycles. Seems to be a very innovative and vibrant company and I'll definitely be building one during the forthcoming winter lockdown (assuming it happens). Anyway there'll be a weather lockdown for me

A very good find, Peter.


Thread: Return of the SMA
22/09/2020 19:43:31
Posted by kevin b on 22/09/2020 19:04:27:
Posted by Wilco Wingco on 22/09/2020 18:52:40:

Anybody remember the SMAE in the early 60s?.


Wasn't that a time when young people wore strange clothes, talked in an unusual language and took drugs ?

Some things don't change. (See the SMAE / BMFA for details) !


I don't know about the SMAE (model aeroplanes with the things of the past for me in the 60s) but if strange clothes includes competing in motorcycle trials wearing flannels and a tie under my Barbour International suit then that was me! No drugs except (I'm ashamed to confess) tobacco and a very small amount of alcohol (honest) not much rock 'n' roll but I did manage a bit of the other

I don't get on very well with small models. I find my sweet spot is 1.3 to 1.5 metres - smaller than that I find hard to follow.


Thread: Rans S-9 Chaos. Peter Miller's new design blog
22/09/2020 19:32:00

Just been looking at the plan. I wonder if Sarik (or SLEC) are going to do a CNC set of parts and an additional wood pack. I think I'd 'invest' if they did That'll be two Peter Miller designs to build over winter.

Both scale(ish). At least scale enough for me.


Edited By Geoff S on 22/09/2020 19:32:26

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