Are there standard crimp connectors for electric flight?

A friend uses 10Amp car connectors - but I have found them difficult to 
get.
Halfords have 5 Amp and 15 Amp - but not 10 Amp.

I want to standardise on something that is fairly standard in the 
modelling world.  What do most people use?
-- 
Chris

Chris wrote:
> Are there standard crimp connectors for electric flight?
> 
> A friend uses 10Amp car connectors - but I have found them difficult to 
> get.
> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
> 
> I want to standardise on something that is fairly standard in the 
> modelling world.  What do most people use?
why do you use crimps there are much better alternatives even soldering 
and heat shrink is so much better(if done correctly), which is what I 
would use for a semi permanent connection or if you need to remove items 
then 2mm 3mm or 4mm gold connectors

In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
 writes
>Chris wrote:
>> Are there standard crimp connectors for electric flight?
>>  A friend uses 10Amp car connectors - but I have found them difficult 
>>to get.
>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>  I want to standardise on something that is fairly standard in the 
>>modelling world.  What do most people use?

>why do you use crimps there are much better alternatives even soldering 
>and heat shrink is so much better(if done correctly), which is what I 
>would use for a semi permanent connection or if you need to remove 
>items then 2mm 3mm or 4mm gold connectors

The engineering consensus now seems to be that crimping is more reliable 
than soldering.  Soldering is said to suffer from brittleness.
Crimping is used in aerospace - and I quote: "They could afford the 
solder!"
-- 
Chris

Chris wrote:
> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>  writes
>> Chris wrote:
>>> Are there standard crimp connectors for electric flight?
>>>  A friend uses 10Amp car connectors - but I have found them difficult 
>>> to get.
>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>  I want to standardise on something that is fairly standard in the 
>>> modelling world.  What do most people use?
> 
>> why do you use crimps there are much better alternatives even 
>> soldering and heat shrink is so much better(if done correctly), which 
>> is what I would use for a semi permanent connection or if you need to 
>> remove items then 2mm 3mm or 4mm gold connectors
> 
> The engineering consensus now seems to be that crimping is more reliable 
> than soldering.  Soldering is said to suffer from brittleness.
> Crimping is used in aerospace - and I quote: "They could afford the 
> solder!"
but the aerospace industry does not use halfords crimps?? :-)
not had one failure in any of my joints yet but quite a few down to 
brain errors ;-)

In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
 writes
>Chris wrote:
>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>> writes
>>> Chris wrote:

>>>> Are there standard crimp connectors for electric flight?
>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>difficult to get.
>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>  I want to standardise on something that is fairly standard in the 
>>>>modelling world.  What do most people use?

>>> why do you use crimps there are much better alternatives even 
>>>soldering and heat shrink is so much better(if done correctly), which 
>>>what I would use for a semi permanent connection or if you need to 
>>>remove items then 2mm 3mm or 4mm gold connectors

>>  The engineering consensus now seems to be that crimping is more 
>>reliable  than soldering.  Soldering is said to suffer from brittleness.
>> Crimping is used in aerospace - and I quote: "They could afford the 
>>solder!"

>but the aerospace industry does not use halfords crimps?? :-)
>not had one failure in any of my joints yet but quite a few down to 
>brain errors ;-)

Point taken Kevin.  I am getting back into modelling after a long break 
- and starting electric for the first time - and I want to be as 
standard as possible from the standpoint of sharing batteries with 
others etc.  The friend that uses the 10 Amp crimps is very experienced 
- and so it may pay me just to go for compatibility with him.
-- 
Chris

Chris wrote:
> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>  writes
>> Chris wrote:
>>> Are there standard crimp connectors for electric flight?
>>>  A friend uses 10Amp car connectors - but I have found them difficult 
>>> to get.
>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>  I want to standardise on something that is fairly standard in the 
>>> modelling world.  What do most people use?
> 
>> why do you use crimps there are much better alternatives even 
>> soldering and heat shrink is so much better(if done correctly), which 
>> is what I would use for a semi permanent connection or if you need to 
>> remove items then 2mm 3mm or 4mm gold connectors
> 
> The engineering consensus now seems to be that crimping is more reliable 
> than soldering.  Soldering is said to suffer from brittleness.
> Crimping is used in aerospace - and I quote: "They could afford the 
> solder!"


It wasn't once.

Anyway most people use
gold bullets
Deans
Astro gold zero loss polrized or
Tamiyas.

Mostly the model is broken long before the solder/heatshrink fractures ;-)

On Wed, 22 Aug 2007 19:50:34 +0100, Chris  wrote:


>The engineering consensus now seems to be that crimping is more reliable 
>than soldering.  Soldering is said to suffer from brittleness.
>Crimping is used in aerospace - and I quote: "They could afford the 
>solder!"

Sometimes I will crimp, then solder...  :)

David

Chris wrote:
> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>  writes
>> Chris wrote:
>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>  writes
>>>> Chris wrote:
> 
>>>>> Are there standard crimp connectors for electric flight?
>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>> difficult to get.
>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>  I want to standardise on something that is fairly standard in the 
>>>>> modelling world.  What do most people use?
> 
>>>> why do you use crimps there are much better alternatives even 
>>>> soldering and heat shrink is so much better(if done correctly), 
>>>> which what I would use for a semi permanent connection or if you 
>>>> need to remove items then 2mm 3mm or 4mm gold connectors
> 
>>>  The engineering consensus now seems to be that crimping is more 
>>> reliable  than soldering.  Soldering is said to suffer from brittleness.
>>> Crimping is used in aerospace - and I quote: "They could afford the 
>>> solder!"
> 
>> but the aerospace industry does not use halfords crimps?? :-)
>> not had one failure in any of my joints yet but quite a few down to 
>> brain errors ;-)
> 
> Point taken Kevin.  I am getting back into modelling after a long break 
> - and starting electric for the first time - and I want to be as 
> standard as possible from the standpoint of sharing batteries with 
> others etc.  The friend that uses the 10 Amp crimps is very experienced 
> - and so it may pay me just to go for compatibility with him.
but how can you share a battery thats crimped??? or have we got our 
wires crossed or do you mean something like 10amp crimped spades??
http://www.kampenwagen.co.uk/Crimping.htm
as I dont think these are designed for repeated insertions

Crimping then soldering probably results in a less reliable connection, 
depending on the application. Solder will 'wick' up the strands of the cable 
making it solid. This can lead to breakage if it is flexed. Just crimping 
retains the flexibility of the stranded cable.

Peter


"David Hopper"  wrote in message 
news:peqpc3t84gnh18uro6b5nlhc73bmgf7l1p@4ax.com...
> On Wed, 22 Aug 2007 19:50:34 +0100, Chris  wrote:
>
>
>>The engineering consensus now seems to be that crimping is more reliable
>>than soldering.  Soldering is said to suffer from brittleness.
>>Crimping is used in aerospace - and I quote: "They could afford the
>>solder!"
>
> Sometimes I will crimp, then solder...  :)
>
> David

Peter Seddon wrote:
> Crimping then soldering probably results in a less reliable connection, 
> depending on the application. Solder will 'wick' up the strands of the 
> cable making it solid. This can lead to breakage if it is flexed. Just 
> crimping retains the flexibility of the stranded cable.
> 
> Peter
> 

The trouble with crimping is that whilst its highly suitable for 
automation, where you can relaibly cut, strip and crimp the same wire 
and the same connector, with a precise tool, its not as good when you 
are doing one offs. Crimps tend to fail via corrosion, soldered with 
brittle fractore. You pays yer money..

Crimps are used in production because they are cheap. Because they are, 
with automatic machines, very fast.

They are not necessarily better than solder. They are however GOOD ENOUGH.

If you use a good heat shrink to support the wire solder works very 
reliably. Needless to say in production work this is also very time 
consuming and expensive.

Crimps are used almost exclusively in the aviation world and have been for 
some time. Decent crimps (not the three colour automotive type) are crimped 
with precision termination tools that are calibrated on a regular basis to 
help ensure the quality of the joint. The crimps also hold the insulation in 
a lot of cases which makes for a flexible joint.

I would have no hesitation in using them in model use but I doubt they would 
be readily available for high current (70 amps upwards) use.


"The Natural Philosopher" <a@b.c> wrote in message 
news:1187861244.8868.0@proxy01.news.clara.net...
> Peter Seddon wrote:
>> Crimping then soldering probably results in a less reliable connection, 
>> depending on the application. Solder will 'wick' up the strands of the 
>> cable making it solid. This can lead to breakage if it is flexed. Just 
>> crimping retains the flexibility of the stranded cable.
>>
>> Peter
>>
>
> The trouble with crimping is that whilst its highly suitable for 
> automation, where you can relaibly cut, strip and crimp the same wire and 
> the same connector, with a precise tool, its not as good when you are 
> doing one offs. Crimps tend to fail via corrosion, soldered with brittle 
> fractore. You pays yer money..
>
> Crimps are used in production because they are cheap. Because they are, 
> with automatic machines, very fast.
>
> They are not necessarily better than solder. They are however GOOD ENOUGH.
>
> If you use a good heat shrink to support the wire solder works very 
> reliably. Needless to say in production work this is also very time 
> consuming and expensive.

In article <Nuazi.55202$vi3.44439@newsfe2-gui.ntli.net>, Kevin 
 writes
>Chris wrote:
>> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>> writes
>>> Chris wrote:
>>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>> writes
>>>>> Chris wrote:

>>>>>> Are there standard crimp connectors for electric flight?
>>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>>>difficult to get.
>>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>>  I want to standardise on something that is fairly standard in 
>>>>>>modelling world.  What do most people use?

>>>>> why do you use crimps there are much better alternatives even 
>>>>>soldering and heat shrink is so much better(if done correctly), 
>>>>>which what I would use for a semi permanent connection or if you 
>>>>>need to remove items then 2mm 3mm or 4mm gold connectors

>>>>  The engineering consensus now seems to be that crimping is more 
>>>>reliable  than soldering.  Soldering is said to suffer from brittleness.
>>>> Crimping is used in aerospace - and I quote: "They could afford the 
>>>>solder!"

>>> but the aerospace industry does not use halfords crimps?? :-)
>>> not had one failure in any of my joints yet but quite a few down to 
>>>brain errors ;-)

>>  Point taken Kevin.  I am getting back into modelling after a long 
>>break  - and starting electric for the first time - and I want to be 
>>as  standard as possible from the standpoint of sharing batteries with 
>>others etc.  The friend that uses the 10 Amp crimps is very 
>>experienced  - and so it may pay me just to go for compatibility with him.

>but how can you share a battery thats crimped??? or have we got our 
>wires crossed or do you mean something like 10amp crimped spades??
>http://www.kampenwagen.co.uk/Crimping.htm
>as I dont think these are designed for repeated insertions

The ones I'm talking about are called "bullet connectors".
-- 
Chris

Stu wrote:
> Crimps are used almost exclusively in the aviation world and have been for 
> some time. Decent crimps (not the three colour automotive type) are crimped 
> with precision termination tools that are calibrated on a regular basis to 
> help ensure the quality of the joint. The crimps also hold the insulation in 
> a lot of cases which makes for a flexible joint.
> 
> I would have no hesitation in using them in model use but I doubt they would 
> be readily available for high current (70 amps upwards) use.
> 

Precisely. Under carefully controlled and repeatable conditions in a non 
corrosive environment, its a very cheap and reliable way to do things.

However model makers at home do not in general have the above conditions.

Crimps are regularly used in automotive work on starter motor wires: up 
to 500A or so. Its no big deal. I have myself taken such apart with a 
brisk tug when corrosion has set in, and soldered them back together ;-)



> 
> "The Natural Philosopher" <a@b.c> wrote in message 
> news:1187861244.8868.0@proxy01.news.clara.net...
>> Peter Seddon wrote:
>>> Crimping then soldering probably results in a less reliable connection, 
>>> depending on the application. Solder will 'wick' up the strands of the 
>>> cable making it solid. This can lead to breakage if it is flexed. Just 
>>> crimping retains the flexibility of the stranded cable.
>>>
>>> Peter
>>>
>> The trouble with crimping is that whilst its highly suitable for 
>> automation, where you can relaibly cut, strip and crimp the same wire and 
>> the same connector, with a precise tool, its not as good when you are 
>> doing one offs. Crimps tend to fail via corrosion, soldered with brittle 
>> fractore. You pays yer money..
>>
>> Crimps are used in production because they are cheap. Because they are, 
>> with automatic machines, very fast.
>>
>> They are not necessarily better than solder. They are however GOOD ENOUGH.
>>
>> If you use a good heat shrink to support the wire solder works very 
>> reliably. Needless to say in production work this is also very time 
>> consuming and expensive. 
> 
>

Chris wrote:
> In article <Nuazi.55202$vi3.44439@newsfe2-gui.ntli.net>, Kevin 
>  writes
>> Chris wrote:
>>> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>>>  writes
>>>> Chris wrote:
>>>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>>>  writes
>>>>>> Chris wrote:
> 
>>>>>>> Are there standard crimp connectors for electric flight?
>>>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>>>> difficult to get.
>>>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>>>  I want to standardise on something that is fairly standard in 
>>>>>>> modelling world.  What do most people use?
> 
>>>>>> why do you use crimps there are much better alternatives even 
>>>>>> soldering and heat shrink is so much better(if done correctly), 
>>>>>> which what I would use for a semi permanent connection or if you 
>>>>>> need to remove items then 2mm 3mm or 4mm gold connectors
> 
>>>>>  The engineering consensus now seems to be that crimping is more 
>>>>> reliable  than soldering.  Soldering is said to suffer from 
>>>>> brittleness.
>>>>> Crimping is used in aerospace - and I quote: "They could afford the 
>>>>> solder!"
> 
>>>> but the aerospace industry does not use halfords crimps?? :-)
>>>> not had one failure in any of my joints yet but quite a few down to 
>>>> brain errors ;-)
> 
>>>  Point taken Kevin.  I am getting back into modelling after a long 
>>> break  - and starting electric for the first time - and I want to be 
>>> as  standard as possible from the standpoint of sharing batteries 
>>> with others etc.  The friend that uses the 10 Amp crimps is very 
>>> experienced  - and so it may pay me just to go for compatibility with 
>>> him.
> 
>> but how can you share a battery thats crimped??? or have we got our 
>> wires crossed or do you mean something like 10amp crimped spades??
>> http://www.kampenwagen.co.uk/Crimping.htm
>> as I dont think these are designed for repeated insertions
> 
> The ones I'm talking about are called "bullet connectors".
Ah but my comment still stands these are not suitable IMHO for repeated 
make and break connection as in a battery connection

Kevin wrote:
> Chris wrote:
>> have we got our 
>>> wires crossed or do you mean something like 10amp crimped spades??
>>> http://www.kampenwagen.co.uk/Crimping.htm
>>> as I dont think these are designed for repeated insertions
>>
>> The ones I'm talking about are called "bullet connectors".
> Ah but my comment still stands these are not suitable IMHO for repeated 
> make and break connection as in a battery connection

gold bullets are eminenmtly suitable. Except for crimping.

In article <xTezi.44100$6z6.18632@newsfe1-gui.ntli.net>, Kevin 
 writes
>Chris wrote:
>> In article <Nuazi.55202$vi3.44439@newsfe2-gui.ntli.net>, Kevin 
>> writes
>>> Chris wrote:
>>>> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>>>> writes
>>>>> Chris wrote:
>>>>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>>>> writes
>>>>>>> Chris wrote:

>>>>>>>> Are there standard crimp connectors for electric flight?
>>>>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>>>>>difficult to get.
>>>>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>>>>  I want to standardise on something that is fairly standard in 
>>>>>>>>modelling world.  What do most people use?

>>>>>>> why do you use crimps there are much better alternatives even 
>>>>>>>soldering and heat shrink is so much better(if done correctly), 
>>>>>>>which what I would use for a semi permanent connection or if you 
>>>>>>>need to remove items then 2mm 3mm or 4mm gold connectors

>>>>>>  The engineering consensus now seems to be that crimping is more 
>>>>>>reliable  than soldering.  Soldering is said to suffer from 
>>>>>>brittleness.
>>>>>> Crimping is used in aerospace - and I quote: "They could afford 
>>>>>>solder!"

>>>>> but the aerospace industry does not use halfords crimps?? :-)
>>>>> not had one failure in any of my joints yet but quite a few down 
>>>>>to  brain errors ;-)

>>>>  Point taken Kevin.  I am getting back into modelling after a long 
>>>>break - and starting electric for the first time - and I want to be 
>>>>as  standard as possible from the standpoint of sharing batteries 
>>>>with others etc.  The friend that uses the 10 Amp crimps is very 
>>>>experienced  - and so it may pay me just to go for compatibility with  him.

>>> but how can you share a battery thats crimped??? or have we got our 
>>>wires crossed or do you mean something like 10amp crimped spades??
>>> http://www.kampenwagen.co.uk/Crimping.htm
>>> as I dont think these are designed for repeated insertions

>>  The ones I'm talking about are called "bullet connectors".

>Ah but my comment still stands these are not suitable IMHO for repeated 
>make and break connection as in a battery connection

What are your reasons?
What do you think might happen?
The friend who does use them has done so for many years without incident 
and he is an experienced electronics engineer.
-- 
Chris

Chris wrote:
> In article <xTezi.44100$6z6.18632@newsfe1-gui.ntli.net>, Kevin 
>  writes
>> Chris wrote:
>>> In article <Nuazi.55202$vi3.44439@newsfe2-gui.ntli.net>, Kevin 
>>>  writes
>>>> Chris wrote:
>>>>> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>>>>>  writes
>>>>>> Chris wrote:
>>>>>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>>>>>  writes
>>>>>>>> Chris wrote:
> 
>>>>>>>>> Are there standard crimp connectors for electric flight?
>>>>>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>>>>>> difficult to get.
>>>>>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>>>>>  I want to standardise on something that is fairly standard in 
>>>>>>>>> modelling world.  What do most people use?
> 
>>>>>>>> why do you use crimps there are much better alternatives even 
>>>>>>>> soldering and heat shrink is so much better(if done correctly), 
>>>>>>>> which what I would use for a semi permanent connection or if you 
>>>>>>>> need to remove items then 2mm 3mm or 4mm gold connectors
> 
>>>>>>>  The engineering consensus now seems to be that crimping is more 
>>>>>>> reliable  than soldering.  Soldering is said to suffer from 
>>>>>>> brittleness.
>>>>>>> Crimping is used in aerospace - and I quote: "They could afford 
>>>>>>> solder!"
> 
>>>>>> but the aerospace industry does not use halfords crimps?? :-)
>>>>>> not had one failure in any of my joints yet but quite a few down 
>>>>>> to  brain errors ;-)
> 
>>>>>  Point taken Kevin.  I am getting back into modelling after a long 
>>>>> break - and starting electric for the first time - and I want to be 
>>>>> as  standard as possible from the standpoint of sharing batteries 
>>>>> with others etc.  The friend that uses the 10 Amp crimps is very 
>>>>> experienced  - and so it may pay me just to go for compatibility 
>>>>> with  him.
> 
>>>> but how can you share a battery thats crimped??? or have we got our 
>>>> wires crossed or do you mean something like 10amp crimped spades??
>>>> http://www.kampenwagen.co.uk/Crimping.htm
>>>> as I dont think these are designed for repeated insertions
> 
>>>  The ones I'm talking about are called "bullet connectors".
> 
>> Ah but my comment still stands these are not suitable IMHO for 
>> repeated make and break connection as in a battery connection
> 
> What are your reasons?
> What do you think might happen?
> The friend who does use them has done so for many years without incident 
> and he is an experienced electronics engineer.


I think if you check the specifications for them repeated 
insertions/withdrawals are not recommended but I could be wrong I just 
find those stlye of conectors lossen ever time you re-use them and the 
cheapo Halfords ones are going to be a higher resistance than a gold 
plated ones similar to these
 
<http://cgi.ebay.co.uk/4mm-gold-plug-socket-2-pairs-UK-seller_W0QQitemZ300141526723QQihZ020QQcategoryZ34056QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>

I would avoid any tin plated connectors full stop
Or go for something similar these
<http://cgi.ebay.co.uk/10-pairs-of-T-plug-Connector-RC-Remote-battery-Deans_W0QQitemZ200144597984QQihZ010QQcategoryZ34056QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>

In article <l7kzi.55260$vi3.49925@newsfe2-gui.ntli.net>, Kevin 
 writes
>Chris wrote:
>> In article <xTezi.44100$6z6.18632@newsfe1-gui.ntli.net>, Kevin 
>> writes
>>> Chris wrote:
>>>> In article <Nuazi.55202$vi3.44439@newsfe2-gui.ntli.net>, Kevin 
>>>> writes
>>>>> Chris wrote:
>>>>>> In article <Yy0zi.21874$ph7.15727@newsfe5-win.ntli.net>, Kevin 
>>>>>> writes
>>>>>>> Chris wrote:
>>>>>>>> In article <LK_yi.38872$ie3.3461@newsfe3-gui.ntli.net>, Kevin 
>>>>>>>> writes
>>>>>>>>> Chris wrote:

>>>>>>>>>> Are there standard crimp connectors for electric flight?
>>>>>>>>>>  A friend uses 10Amp car connectors - but I have found them 
>>>>>>>>>>difficult to get.
>>>>>>>>>> Halfords have 5 Amp and 15 Amp - but not 10 Amp.
>>>>>>>>>>  I want to standardise on something that is fairly standard 
>>>>>>>>>>modelling world.  What do most people use?

>>>>>>>>> why do you use crimps there are much better alternatives even 
>>>>>>>>>soldering and heat shrink is so much better(if done correctly), 
>>>>>>>>>which what I would use for a semi permanent connection or if 
>>>>>>>>>you need to remove items then 2mm 3mm or 4mm gold connectors

>>>>>>>>  The engineering consensus now seems to be that crimping is 
>>>>>>>>more  reliable  than soldering.  Soldering is said to suffer 
>>>>>>>>from brittleness.
>>>>>>>> Crimping is used in aerospace - and I quote: "They could afford 
>>>>>>>>solder!"

>>>>>>> but the aerospace industry does not use halfords crimps?? :-)
>>>>>>> not had one failure in any of my joints yet but quite a few down 
>>>>>>>brain errors ;-)

>>>>>>  Point taken Kevin.  I am getting back into modelling after a 
>>>>>>break - and starting electric for the first time - and I want to 
>>>>>>be  as standard as possible from the standpoint of sharing 
>>>>>>batteries  with others etc.  The friend that uses the 10 Amp 
>>>>>>crimps is very experienced  - and so it may pay me just to go for 
>>>>>>him.

>>>>> but how can you share a battery thats crimped??? or have we got 
>>>>>wires crossed or do you mean something like 10amp crimped spades??
>>>>> http://www.kampenwagen.co.uk/Crimping.htm
>>>>> as I dont think these are designed for repeated insertions

>>>>  The ones I'm talking about are called "bullet connectors".

>>> Ah but my comment still stands these are not suitable IMHO for 
>>>repeated make and break connection as in a battery connection

>>  What are your reasons?
>> What do you think might happen?
>> The friend who does use them has done so for many years without 
>>incident  and he is an experienced electronics engineer.

>I think if you check the specifications for them repeated 
>insertions/withdrawals are not recommended but I could be wrong I just 
>find those stlye of conectors lossen ever time you re-use them and the 
>cheapo Halfords ones are going to be a higher resistance than a gold 
>plated ones similar to these
><http://cgi.ebay.co.uk/4mm-gold-plug-socket-2-pairs-UK-seller_W0QQitemZ3
>00141526723QQihZ020QQcategoryZ34056QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>>
>I would avoid any tin plated connectors full stop
>Or go for something similar these
><http://cgi.ebay.co.uk/10-pairs-of-T-plug-Connector-RC-Remote-battery-De
>ans_W0QQitemZ200144597984QQihZ010QQcategoryZ34056QQssPageNameZWDVWQQrdZ1
>QQcmdZViewItem>

Thanks for the links.  I hadn't come across T-Plug connectors.  They 
look interesting.  I have discussed your comments with the 
aforementioned friend, who says that he does use soldered connections 
for everything except the battery.  For instance, he permanently solders 
the motor to its speed controller, not using connectors at all.  He uses 
the crimped bullet connectors solely for battery connections which have 
to be repeatedly disconnected.
BTW he didn't get his from Halfords; they probably came from work.
-- 
Chris