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Member postings for Plummet

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

Thread: What applications would I need on a lap top?
21/10/2020 17:09:58
Posted by kc on 13/10/2020 18:03:58:

We shouldn't forget that the free software we get is like the free tuition at the flying field and the good advice here on the forum - it's largely down to volunteers who are trying to put something back into society instead of making themselves rich.

... which is the advantage. In addition, this method of writing software results in more efficient more usable software.

[rant warning/]

I often hear people say that you just get what you pay for. This does not apply to the open source software.

Companies selling software keep their source code (their programmes) secret. Only the company people have the ability to debug it. They are motivated to get the software on sale, not to spend time and effort to debug it.

In contrast, open source software is just that. The source code is available to everybody. It is written to be used, not just to be sold. If there are any bugs in it they are reported and dealt with; often someone who is not the original programmer will be able to identify the problem. Having been a programmer, I know that it can be hard to find your own mistakes!

The operating system I use is Linux, which is derived from Unix which pre-existed the IBM PC and Microsoft. It was developed by some brilliant computer people working for Bell Labs in the US. They also developed the "C" programming language which was largely used for writing Windows.

There is also a group called GNU which is devoted to producing open source software to run of the operating system. They have the philosophy of taking a small simple task and writing rigorous code to undertake it. To solve a complicated problem you divide the problem into lots of smaller problems. Solve these, and then join them together.

This results in lots of snippets of code that do simple jobs very well. These snippets are then available for everyone to re-use.

You would be amazed at how often you use software derived from Unix and Linux. It is embedded in many household electronic equipment.

[rant over/]

Plummet

13/10/2020 12:38:38

Libreoffice £0.00 Word processor, spreadsheet etc.

Gimp £0.00 Image tweaking

Audacity £0.00 If you want to edit audio

(and Linux £0.00 because Windows annoys the bleep out of me. )

Plummet

Thread: Lap top Computers
29/09/2020 13:24:08

A lot of the more expensive laptops are optimised for either size or for gaming. As I have no need for a super slim laptop or the flashy graphics gamers want I suggest that you can ignore these top-end computers.

I use Linux not Windows, so I can live with a much less powerful machine and still get reasonable performance.

So when I have bought laptops I have often gone for end-of-line models. I get them from a proper dealer tha can provide proper support, and I avoid the well known high street names as my experiences with them is dire.

Hope this helps.

Plummet

Thread: Odd moulding servo cavities!
15/09/2020 15:23:26

Further to Shaun's reply ...

We bought Funcubs, and on those the servo cutouts WERE symmetrical, which was a pain. You either had to source two servos with identical throws but opposite rotation, to buy and fit one servo reverser, or to open up a servo and reverse the wiring. Fortunately, I can solder.

Plummet

Thread: Soldering!
08/05/2020 16:43:59

Some wire is coated with a varnish. It needs to be carefully scraped off. Sometimes it can be burnt off in a flame.

This is often because inside a motor or transformer you need to get a lot of turns of the wire into a small space, so ordinary insulation would take up a lot of space, and also impede heat escaping.  The varnish provides enough insulation to allow the windings to touch each other without short circuiting.

Hope this helps.

 

Plummet

Edited By Plummet on 08/05/2020 16:51:29

Thread: Are our wings over-engineered?
04/05/2020 16:42:57
Posted by kc on 04/05/2020 16:10:44:

... Plummet was right ...

Edited By kc on 04/05/2020 16:15:24

Ooooh gosh. I must show that to my wife.

Plummet

04/05/2020 16:03:42
Posted by kc on 04/05/2020 15:50:26:

Actually Plummet the same author JE Gordon wrote 2 excellent books -The New Science of Strong Material or why you dont fall through the floor and also Structures or Why things dont fall down. Both very readable and worthwhile. Penguin Science paperback. Should be in any library.

Thanks KC. I have both books - somewhere.

Plummet

04/05/2020 15:23:54

When I was in education - receiving it that is - we had a Mechanical Engineering lecturer who recommended a book called "The new science of strong materials". Its subtitle was "Or why we don't fall through the floor."

I still have the copy I bought - somewhere!

It discussed why wood is so strong, why fibreglass and resin is so useful and so on.

There are two aviation related bits that I hazily remember. One related to problems with preparation methods for glue joints which failed on the Mosquito. However, relevant to this thread was a discussion about the problems that Fokker (I think it was) had developing one of their WW1 aircraft. The wings were falling off, and the test pilots were then unavailable to answer questions. So they strengthened the wing spars and tried again. Things did not improve, in fact it seemed to make the problem worse. It was eventually realised that the problem was due to the effective centre of lift moving and this causing the wings to twist and disintegrate around the spar. Making the spar weaker and more flexible solved the problem.

Now where did I safely store that book?

Plummet

Thread: Insanity seems to be setting in
21/03/2020 17:13:22

I saw on the web that in Leeds there were huge queues at the Costco cash and carry. The queues stretched round the car park - the queue was to GET IN!

Plummet

17/03/2020 15:56:26
Posted by john stones 1 on 17/03/2020 15:28:57:
The cream will rise to the top Don, the perception of who the cream are may change though.

Funny - I have heard another similar expression used in political circles. The biggest ---- shall we say lumps always float to the top.

Plummet

14/03/2020 14:40:20
Posted by Shaun Walsh on 14/03/2020 13:05:04:

Can the virus be passed on by farting?

There was an article in the New Scientist magazine a couple of weeks ago discussing Chinese reactions to Covid 19.

It said that there were now many infra red cameras in airports and railway stations to look for people who were too warm. It said that they were very sensitive - to the extent that they could detect the extra warmth resulting from - shall we say - fundamental gaseous emissions.

Plummet

11/03/2020 09:51:02
Posted by Doc Marten on 10/03/2020 22:29:13:
When it decomposed it turned to ammonia and was used for fixing the dye.

I always understood that the urine/ammonia acted as a bleach. And don't forget the stuff used to tan leather...

Plummet

09/03/2020 15:57:29
Posted by paul d on 09/03/2020 13:13:07:

My thoughts exactly Jon, my local has also sold out of dry pasta, some people must have very bland diets.

Careful. Marco Polo is said to have seen noodles in China, and introduced Italy to pasta. We all know what has happened in China. Now Italy is having problems. Do we need to avoid noodles and pasta?

Plummet

Edited By Plummet on 09/03/2020 15:58:57

Thread: I learned from that.
02/03/2020 16:12:51

Before I retired I used to work in a University. Part of my job was to "help" with some of the teaching. Since I generally had more experience with the topic than the actual lecturer I also prepared a lot of the course materials.

When the students moaned about things I would often reply "You learn by your mistakes. It is our job to get you to make as many mistakes as possible."

Plummet

Thread: Can Superphatic glue go off?
14/01/2020 11:50:14

Re. an early comment about putting the glue in the fridge ...

The SuperPhatic glue bottle does say "Do not freeze" on the label. so the fridge would be a bad idea.

Yes I do know that the post was retracted. as the advice was for CA glues.

Plummet

Thread: Another plant that needs identifying.
07/01/2020 18:16:35

... and of course, any trees or shrubs that you plant run the risk of being model magnets.

Plummet

07/01/2020 13:38:20
Posted by Erfolg on 07/01/2020 12:22:53:

My next issue will be a small tree that is on its last legs, which I will try and identify with a view of replacing like foe like.

A word of warning. It is often advised that you do NOT plant a similar plant to one that has been removed, especially when it was poorly. It could just mean that the new plant gets the same disease, or at best, is planted into soil that has already been depleted of just the nutrients it especially needs.

Plummet

06/01/2020 16:49:04

Have a look at

**LINK**

What do you think?

Plummet

Thread: Un-equal movement
22/12/2019 17:13:35

May I ask a dumb question ...

The servos are identical aren't they? The same make and model, and bought together?

Plummet

Thread: Foam Model Repair
14/11/2019 14:23:26

I have no experience with it, but just the other day I saw a video on You Tube of a bloke making a foam cored wing using canned expanding foam.

Is there any way you could create a mould or skin to enclose the space to be filled and to then inject some foam. As the foam expands, you would need to have bleed holes to allow excess foam to escape.

Plummet

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