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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: Beth's off.....
30/05/2019 12:10:08

Congrats Beth,

If a boy - Finn

Else perhaps Olivia as in Olivia deHaviland.

Ami

Charlie (or Charli), India, Juliette, Mike, Oscar, Romeo or Victor could be registered if Papa agrees?

Plummet (not a suggestion!)

Thread: In The Newsagents ...
22/05/2019 00:10:51
Posted by Percy Verance on 21/05/2019 22:04:38:

I never have a problem Capt. I simply pick mine up off my doormat each month.........

Using a litter picker to save my back!

Plummet

Thread: Suitable caption?
15/05/2019 18:08:02

Now who said it is good weather for trainers to take to the air?

Plummet

13/05/2019 16:50:05

Sore and soarer.

Plummet

12/05/2019 19:17:30

Accident prone

Plummet

Thread: Hex Drivers
01/05/2019 15:43:04

Another vote for Modelfixings.

But I have found that the Aldi or Lidl special buy tools seem to be good and good value.

Try a good local engineers supplies merchant.

Plummet

Thread: Making wheels
24/04/2019 10:23:18

I made some wheels for a smallish model by sandwiching some thin fibreglass between balsa sheet . I drilled out the centre and inserted a bit of brass tube. I mounted it on some threaded rod and spun it in a drill while sanding it to shape. I made a groove around the rim to take the tyre. I got a length of circular section neoprene sealing strip, cut a suitable length of it, and butt glued it with cyno to make a circular tyre.

Plummet

Thread: Russian Drone - Horrific
31/03/2019 19:20:25

From the school of "What could possibly go wrong"

**LINK**

Plummet

Thread: Fuse
30/03/2019 18:27:44

David,

At the top of the fuselage plan sheet there is the text "Single wing joiner of 10 swg wire in 4 1/2" long drinking straw wrapped in tissue.

Then on the wings part of the plan of the centre section it shows the drinking straw in position against the top spa. The rib section shows 6 ribs with a hole for the straw.

The drinking straw is not "structural" it just acts as a guide to make sure that the wire joiner goes into the correct position through the holes in the ribs.

The old drinking straws were made of waxed paper, and would be difficult to glue, so wraping them in tissue would make them gluable, while the straw would resist the glue, and stop the wire being glued in as well.

It suggests that you build the entire centre section in one piece so that it is nice and straight, and then carefully cut it in two halves (remembering not to knacker the scalpel blade by trying to cut the wire as well).

Does this make sense?

Nowadays a piece of carbon fibre tube might be a better bet.

Plummet

Edited By Plummet on 30/03/2019 18:28:59

27/03/2019 22:26:30

Look at the indoor electric models. They are ultra light, but they have full house radio control. All you want is a single channel that activates the dethermaliser. Their receivers are ultra light, as are their servos.. Is this the way to go?

Plummet

27/03/2019 15:33:00

Another thought comes to my mind ...

It is a good idea to make sure that a burning fuse does not make contact with tissue and dope covering.

One of the constituents of dope is nitro-celulose, which is chemically the same as guncotton or the flashpaper magicians use.

Otherwise the results might be spectacular.

Plummet

26/03/2019 13:31:10
Posted by david miles 7 on 21/03/2019 15:00:12:

Hello Everyone.

This is my first post.

I have just downloaded the plans for a Frog Diana 36 inch wingspan glider. I notice that there is a "string fuse" at the end of the fin. Can anyone tell me what it is for? This is my first attempt at building a model glider!

Thanks for any help.

David Miles.

Just for completeness, the original question asked what is a "string fuse". I have skimmed through the answers and I don't think (I could be wrong - if so, sorry) that anyone has answered this question.

The string fuse is a piece of string that will smoulder, without going out, and that will burn at a fairly predictable rate. For a dethermaliser the tailplane is held down with a rubber band. The string fuse is lodged in between the strands of the rubber band and it is lit before the flight.

It smoulders, and when the burning part reaches the rubber band it breaks the band, and another rubber band pulls the tailplane up to an angle where the glider stalls and decends quickly.

When I was a kid I used to make string fuse by dissolving some saltpetre (potassium nitrate) in water, and then soaking cotton string in the solution. Take out the string and let it dry.

When you light the string it may burn, but if you blow out the flame it will continue to smoulder.

(The saltpetre reacts to the heat from the burning string by breaking down and releasing oxygen. This helps to prevent the smouldering going out. Saltpetre is used in gunpowder for the same purpose, so you may get funny looks if you try to buy it nowadays.)

The string should burn at a steady rate. Test a piece of it to calibrate how long a piece you need.

Plummet

Thread: Growing chillies from seed
17/03/2019 17:53:04

If I rig an electric fence around my plot then it is more likely that it would be to deter (cook?) the sweet little (I don't think) bunny rabbits with which I have to attempt to share my vegetables.

Plummet

p.s. I know that I am not the speediest person around, but I can still overtake one of the onions.

Edited By Plummet on 17/03/2019 17:53:31

17/03/2019 16:39:59

Off topic ... ish ...

I sent away for some special unusual onions. (Variously known as Tree, Egyptian, or Walking Onions.)

The company were selling one onion plant, but they promised to send four, so that there was a good chance that one would survive. When they arrived there were not four but seven.

I planted them all, and six out of the seven are growing.

laugh

Plummet

11/03/2019 12:41:07
Posted by Charles Pic on 11/03/2019 12:08:09:

After ten days, only 1 of my 6 seeds had sprouted. So that one has now been planted into a small pot. Not sure if the others are going to do anything so I have started 6 more seeds in damp kitchen paper. I did just realise though that I’ve omitted the “fridge for 24 hours” stage from the latest batch of 6. Will have to wait and see if they sprout anyway.

Chilli seeds need to be kept warm to germinate.

**LINK**

The web page above suggests above 20 C.

This only seems fair - we keep them warm when they are little, and they provide heat in return when they have grown up.

I have also read that germination may take 10 days or so.

Plummet

Thread: Small springs
02/03/2019 17:34:34
Posted by Geoff Sleath on 02/03/2019 17:14:02:

Rubber bands are very useful but when under tension tend to perish. I've no idea why and 'O' rings are the same. I use them on the long pins that help to fix the interplane struts on my DB Moths and keep a bag of spares in my tool box. The ones in the bags don't deteriorate at all. So keep a few spares to hand.

Geoff

UV light. Rots a lot of things.

You can buy fine silicone rubber tube.  Cut a length and tie it into a loop.  It lasts a lot longer than rubber.  I acquired a skein of it that was surplus to requirements many years ago and have been working my way through it slowly.     

Plummet

Edited By Plummet on 02/03/2019 17:39:06

Thread: Growing chillies from seed
01/03/2019 12:14:29
Posted by Don Fry on 01/03/2019 11:58:42:

In SW France, coriander is like gold dust. I've never been able to grow it, but I'm a rubbish gardener. Any ideas?

I have not tried growing it, but some years ago we knew a lady who taught Urdu. She grew it well.

This was in Bradford, so the climate is not like SW France, but she just planted a few seeds in a row. They grew quickly, and was soon ready to harvest (the leaf - that is) so she had to make a series of successive sowings in order to keep it available.

The bit of land she used was amazing. It was a strip of fine gravel that was between her concrete or tarmac (I forget) driveway and the brick wall of her house. I think that the strip was between 6" and 9" wide. I have no idea what sois was under the gravel (if any).

So poor soil and lots of heat from the wall. That sounds as if SW France has more possibilities.

Plummet

01/03/2019 11:16:14

A useful website is

**LINK**

You can enter where you live and it adjusts suggested dates for planting etc. See in the top right hand corner of the front page.

Plummet

Thread: LED Bulbs pt2
22/02/2019 12:49:14

OK, so I understand that the "strand" is the 10 way cable that is attached to X3.

This means that you can control up to 10 LEDs or groups of LEDs.

Consider this (rather scruffy) circuit diagram.

diodes.jpeg

Here we are controlling two groups of LEDs. The two switchy things at the bottom left hand corner are playing the parts of two channels of your controller thingy.

The leds in group A are in series. Those in B are in parallel. The two boxes at the bottom are two resistors.

Now suppose that your battery produces 12 volts, and that each LED drops 2 volts when shining and needs a current of 15 mA (0.015 Amps)

If you want to think of electronics as being a bit like plumbing, then the Voltage is like water pressure, and the current is the amount of water flowing. We might say that the watery battery generates a pressure of 12psi. and that each LED will have a pressure drop of 2 psi across it. The resistors are there to limit the current in each branch. If they were not there then too much current would flow and the diodes would expire.

Looking at branch A. The same water/current passes through each LED. So the total current in the branch, and flowing through the resistor is 15 mA. However each LED is dropping the voltage/pressure by 2, so the 4 LEDS drop a total of 8 Volts/psi. Thus the resistor must drop 12 - 8 = 4 Volts/psi.

Compare branch B. (First we must assume that all the LEDs are identical. This assumption is not always possible to satisfy, so using LEDs in parallel is often a bad idea.

There will be 15 mA flowing through each LED, so a total current of 60 mA must flow through the branch B resistor.

The volt drop across the LEDs will be 2 volts. This means that the resistor must drop 12 - 2 = 10 volts.

By Ohms law ...

V = I R

so

R = V / I

Resistor A must be 4 / 0.015 = 266 ohms,

and resistor B is 10 / 0.060 = 166 ohms.

Plummet

20/02/2019 17:51:23

Gary,

As Frank has said, the connection should go from "8" on connector X1 [LHS] to one of the pins 1-8 of X3 [Lower LHS] as shown in the manual on page 46.

The X1 pin 8 is the +ve supply. The X3 pins are switched so that when switched on current can flow from +ve supply, through your leds, and to 0V (the other side of the battery.

You ask about leds in strands.

I am not sure what you are asking.

A. You might have some ready mounted strips of LEDs in some form of ribbon.

B. Or you may be wishing to put several leds in series, linking the +ve of one led to the -ve of the next.

C. Lastly you might be wishing to put a number of LEDs in parallel, that is, all their +ve s connected together, and all their -ve s connected together.

An answer about the resistor requires that we know which of the three you are trying, and also what supply voltage you are using.

Plummet

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