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Member postings for Andy48

Here is a list of all the postings Andy48 has made in our forums. Click on a thread name to jump to the thread.

Thread: Connectors - which way round
08/10/2020 09:11:56

You are expecting far too much. As in this case the terminology was set by convention many decades ago. Its just that, a convention, but quite simple and it works well. I wonder did you spend hours trying to understand why we drive on the left when you learned to drive, because there is no logical reason for that?

07/10/2020 21:38:10
Posted by TonyS on 07/10/2020 20:14:50:

I’ll quote an earlier post by you “I've done a lot of safety critical design work using plugs / sockets of all shapes and sizes, including mixing of male and female pins within individual plugs and sockets” .

As for “there is standardisation you go by the internal connectors” that doesn’t help if you want someone to pass you a part that has both a male and a female does it?

Engineers may like to be pedantic about engineering stuff. I like to pedantic about the use of language.

Surely we can have a debate and see each other’s points without getting all annoyed? smiley

Actually the quote you've given is not mine.

You might think you are pedantic about language, but please don't class engineers as being illiterate. We are not and personally, I would like to think my standard of English is pretty good. Certainly the editors I've worked with over the last 30 years think so. Engineers, mathematicians and scientists work on precise accurate, language and terminology.

I'm not getting annoyed, don't see where you read that unless again you are misreading what I have written.

You seem to want to differentiate between housings and connectors. Yes they are different. A connector housing is the shell that does not come with contacts. An XT60 connector is a single item, it does not have a housing and bullets as you like to call them, (although a bullet connector is a specific type of connector, not a generalisation). A servo connector has a housing, usually black into which you can inset either male or female pins (or both if you wish).

One always knows which is the live part of a connector, its the socket, and each pin is always shrouded. Thus the battery end of an XT60 is always female. Just as the live end of a house wiring connector is always the socket. The exposed pins or connectors are the non-live parts for obvious reasons. A 240v plug is male.

07/10/2020 19:43:36

Firstly you seem to have ignored the flaws in your arguement, the Deans plug, where there is no shroud on one half of the connector so you have to go by the contacts, and the horrible EC5 type connector where the housing can have either male or female pins.

Second, there is no way you can confuse the internal connectors, they are either male or female.

Thirdly engineers are NOT used to wiring housings with different polarities and different male/female combinations. I really don't know where you plucked that gem of misinformation from. Things fitted to walls are sockets, and the polarity of the contacts is always the same. Indeed on completion of a wiring job this is one of the checks made. You can buy simple testers to check the polarity is correct.

Fourthly there is standardisation, YOU GO BY THE CONTACT NOT THE CONNECTOR APPEARANCE.

Fifthly, a connector is the whole component, whether it be an uninsulated contact or a bunch of contacts in some sort of housing.

Thread: Warning X8R RX - do not use with CDI on IC powered 'planes
07/10/2020 17:14:37
Posted by Geoff Parkes on 07/10/2020 17:13:11:

I have just purchased a Taranis X9D plus 2019 transmitter, this is my first dip into open tx technology, as you know you dont get a battery with this transmitter, so i also purchased a 2S1P 2040ma/h Li-ion battery ( all from the very helpful Richard from T9 ) you do not get a charger either with the transmitter, you charge through the USB port ,the transmitter does have an onboard charging circuit . But does anyone own one of these new transmitters and can advise me what charger they use ? the users manual from T9 gives a spec, of Less than 5 volts @ 2.1amps via a USB adapter for a suitable charger. Many thanks .

I would start a new topic with your post. This will likely get lost in the system.

Thread: Connectors - which way round
07/10/2020 16:34:03
Posted by TonyS on 07/10/2020 16:14:47:
Posted by Andy48 on 07/10/2020 15:42:28:

There's a couple of good examples for starters. laugh

Take the first plug and socket, an EC2 the blue one. That is simply a housing, you can actually put the male pin in either housing. I believe the second one is the same too.

If you take the Deans plug and socket, there is no housing shroud on either side, so you have to go by the contacts as you have done.

Think of servo connectors, the male can go in either type of housing.

I suppose I think of it this way...

If I was in the workshop and I was asking someone to pass me a part I would say can you pass me a male EC5 connector or a male Deans connector or a male 4mm bullet etc etc. Now, with the XT connector I'd be saying a male XT60 that takes the female bullets or a female XT60 which just seems wrong....

Might seem wrong to you, but going by the connectors themselves is foolproof. Using your view there are numerous flaws as has been pointed out.

07/10/2020 15:42:28

There's a couple of good examples for starters. laugh

Take the first plug and socket, an EC2 the blue one. That is simply a housing, you can actually put the male pin in either housing. I believe the second one is the same too.

If you take the Deans plug and socket, there is no housing shroud on either side, so you have to go by the contacts as you have done.

Think of servo connectors, the male can go in either type of housing.

Thread: One-off signwriting for models
07/10/2020 14:12:32

There's an easier solution. Get the OH into craft work, then buy her a vinyl cutter for Christmas. angel

07/10/2020 14:11:31
Posted by perttime on 06/10/2020 04:13:55:

If you have a printer, it should be quite possible to print some decals. Regular printers don't do white, and they are useless for metallic colors.

You can get printer decal sheets that are white to start with not translucent. Try Amazon.

Thread: Firefox refuses to access BMFA website
07/10/2020 14:09:17

Works fine for me on Firefox.

Thread: Connectors - which way round
07/10/2020 13:34:39
Posted by TonyS on 07/10/2020 12:22:20:

I'm with Johhny Foreigner on this one. If you want to describe something as a female XT90 connector then in my mind you should be referring to the connector NOT the internals. That way it applies for EC5's and HXT's or any connector for that matter. Consistent. If you shove it in it's male. As for a 240v plug socket, there's no such thing is there? It's either a 240v plug or a 240v socket.

Brian's comment sums up the screwy-thinking in the UK "Whereas we in the UK will determine male or female plugs and sockets by the gold PINS" - bloody stupid way of doing it. When there are connectors that have a male and female bullet connector in them our way simply doesn't work.

Edited By TonyS on 07/10/2020 12:23:02

When I worked in the electronic industry, the terminology was determined by the connectors themselves, not the housing. Its not screwy thinking. With some connectors the housing is reversible and you can fit either male of female pins, or, indeed, sometimes both in the same gender housing. Done deliberately in complex wiring applications to avoid being able to connect the wrong connectors together.

Usually the housing matches the connector, i.e. if one is male, so is the other. However XT connectors are the opposite, as are several other common types. e.g. "F plug" coax connectors where the male plug has a female housing. Check any electronics catalogue, the gender is determined by the connector pin, not by the housing.

07/10/2020 13:22:40
Posted by Gary Manuel on 06/10/2020 19:19:56:

So what's a 240v plug socket?

There is no such thing Basically its horribly incorrect terminology.

The thing on the wall is simply a socket, or a mains socket.

The thing on the end of the appliance is a mains plug.

Thread: Electric Motor failed ?
10/08/2020 15:49:54
Posted by alan barnstable on 10/08/2020 13:27:10:

Many thanks for the responses, I think it's very likely I've cooked the motor by over stressing it with 5s battery and big prop - it did fly very fast, but not very long !!!

I've got to decide now whether to buy a better motor, e.g. a 4258 as suggested by Bob, or I do have an Irvine 46 I could convert it to, decisions, decisions.

Thanks again.

Don't think its the "big prop", that's not large with electric setups, but a Funfly certainly doesn't need a 5S battery. My electric Funfly has more than enough power with an SK3 3548 840kv and a 4S 3000 battery. Easily get a good 10 minutes out of that on a 12x6 prop with 700+ watts. Flown more gently and you will get considerably in excess of this.

Don't forget that the heavier weight of a 5S battery will have a negative effect on the performance.

 

Edited By Andy48 on 10/08/2020 15:51:27

Thread: Is this Power Supply Suitable?
02/08/2020 21:35:34
Posted by John Wagg on 02/08/2020 21:32:26:

Won't a 4s LiPo need more than 12v to fully charge it.?

Nope. The charger is capable of increasing the output voltage.

Thread: Battery connectors
31/07/2020 17:30:54
Posted by leccyflyer on 31/07/2020 16:30:57:

For my own system I employ colour coded lenghts of blue Sullivan snake out to cover the positive male pin on the battery at all times, except when the connection is actually being made. These are blue for discharged (or storage voltage, or used) and replaced by green when the pack comes off the charger, thus given an instant indication of the status of the battery pack and also preventing the sort of positive pin contacting a metal box scenario described.

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31/07/2020 14:11:45
Posted by perttime on 31/07/2020 06:55:23:

What about small models? Still XT?

Yes, XT30s.

Thread: taranis qx7
18/07/2020 09:35:40

Yes. Check here: Section 7 page 17

**LINK**

Thread: Confused about OTX version
13/07/2020 14:18:00

No. You need to update it to 2.3.9. You've updated Companion but not the transmitter.

Thread: LiPo over-voltage
09/07/2020 14:37:22
Posted by Dickw on 09/07/2020 13:12:29:
Posted by Andy48 on 09/07/2020 11:09:03:
Posted by Tim Kearsley on 09/07/2020 08:54:59:
 
.............................

Either way, I believe a poor connection in the balance lead could result in overcharging on a balanced charge. Far easier, and it seems, safer to normally do a standard charge, and only if the battery shows more than 0.1 or 0.2v difference between cells to finish off with a balance charge.

...........................

Edited By Andy48 on 09/07/2020 11:11:23

I must admit to being a bit surprised at your reference to 0.1 or 0.2v difference. I have just put a couple on charge and the 3s battery has a difference of 0.029v between highest and lowest cell, and for the 10s the difference is .026v. Balancing starts as soon as the charger starts and I would expect cells to be closer at the end.

If any battery shows as much as 0.1v at the start of the charge I would assume a faulty connection or a suspect batery and act accordingly.

Your system obviously works for you, but I don't believe my chargers measure cell volts while balance current is flowing, as a modern battery management IC should take care of that, so I will continue balance charging. each to his own I suppose.

Dick

Sorry, I meant 0.01v

However, this also begs a question as to how closely cells have to be balanced? I've checked many new batteries and found even the best have some variance in the IR.

 

Edited By Andy48 on 09/07/2020 14:44:24

09/07/2020 11:09:03
Posted by Tim Kearsley on 09/07/2020 08:54:59:
 

But this doesn't make logical sense. If the charger is displaying a Voltage of, say, 4.35V then it "knows" that the offending cell is over-Voltage - how else can it be displaying it? I can understand the similar scenario where some high resistance connection results in the charger "seeing" a falsely low Voltage, but then it would display that false reading wouldn't it?

Tim.

 

Two possibilities. It could be I moved the battery thereby restoring a good connection before I looked at the charger, or it is possible that the poor connection corrected itself just before I looked at the charger.

Either way, I believe a poor connection in the balance lead could result in overcharging on a balanced charge. Far easier, and it seems, safer to normally do a standard charge, and only if the battery shows more than 0.1 or 0.2v difference between cells to finish off with a balance charge.

Pity really, because my chargers do quite a fast balanced charge.

Out of interest, my charger will not charge unless the balance lead is connected, and it always does a cell count first to check.

Edited By Andy48 on 09/07/2020 11:11:23

08/07/2020 22:16:10
Posted by Allan Bennett on 08/07/2020 20:37:39:

There's obviously many different makes/types of chargers being considered here. Mine displays individual cell voltages throughout the charge, and I've never seen any cell go above 4.20v -- if it did, the charger would have stopped and given an 'over voltage' error message. If a pack is out of balance it holds the first cell to reach 4.20v while the other cells catch up. Like Chris, I don't understand how any charger can display a cell voltage over 4.20v and not figure out that something's wrong.

Simple, because at the time it does not realise the cell voltage is over 4.2v due to a poor connection.

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