At 20:12:55 on Sun, 16 Aug 2009, Colin Nelson 
 wrote in 
<YMYhm.184185$_t1.25757@newsfe09.ams2>:

>Molly Mockford wrote:
>> At 10:38:22 on Sun, 16 Aug 2009, "Just zis Guy, you know?"
>>  wrote in
>> :
>>
>>> I am constantly amazed at the goods vehicle drivers who
>>> double-declutch when changing up - this will have the precise
>>> opposite of the desired effect.
>>
>> I don't see why?  The desired effect of double de-clutching is to
>> match the engine speed to the gear about to be selected.  Double
>> de-clutching when changing up could be defined as: into neutral -
>> increase revs - into gear;  which is certainly a rather more
>> difficult technique to master than changing down, which is simply:
>> into neutral - revs drop - into gear
>
>I think that you have that the wrong way round. To change from a lower gear to
>a higher one the engine speed needs to drop. To change from a higher 
>gear to a lower one the engine speed needs to increase.

You're right, I got them the wrong way around - I shouldn't post that 
sort of thing while dividing my attention between it and eating my 
dinner!  It's many decades since I drove a vehicle without synchromesh. 
However, the main point remains:  I can't see any reason why double 
de-clutching should only be used when changing down.
-- 
Molly
I don't speak for the Committee.  If I ever do, it will be made
specifically clear.
My Reply-To address *is* valid, though may not be so for ever.