Hi Peter.
Batteries are expensive and overvolting does them no good at all
Tim
On 21 January 2014 19:49, Peter Zutrauen <peterz@zutrasoft.com> wrote:
> "allow high voltage" .... hopefully the battery would do it's best to soa
k
> it up (with the alternator's limited current generating capacity).
>
> Cheers,
> Pete
>
>
> On Tue, Jan 21, 2014 at 2:31 PM, houlihan <houlihan@blueyonder.co.uk>wrot
e:
>
>> Hi David.
>>
>> One thing to bear in mind is that there are, as I understand it, several
>> modes of failure of the Ducatti unit the most benign being that it just
>> stops charging the battery and feeding the services.
>> This is as you describe and as I also suffered ( why does this happen mi
d
>> channel?) but I believe it can fail and possibly allow high voltage DC o
r
>> AC onto the bus giving your expensive radio and other clever stuff a rea
l
>> hard time !
>>
>> In the UK there is very little difference in cost between the Schicke an
d
>> the Ducatti they are very similar in size and the wiring is only slight
ly
>> changed , one wire not connected, and the generator fail light has to
>> become an LED.
>>
>> Tim
>>
>>
>>
>> On 21 January 2014 19:13, David Joyce <davidjoyce@doctors.org.uk> wrote:
>>
>>> davidjoyce@doctors.org.uk>
>>>
>>>
>>> Nigel, Fascinating and impressively erudite. You have totally convinced
>>> me that the way all new builders should go is with a Mofset bit of kit.
>>> However my personal solution is to take the odd Ducatti at sale price
off
>>> anyone not planning to fit them and fly with a spare! In 1000hrs I have
had
>>> one failure. That was inconveniently 1/3 way between Holland and Clacto
n,
>>> but there was enough juice in the battery to get me all the way home wi
th a
>>> bit of thoughtful systems management. I currently fly with Rowland's
>>> spurned new Ducatti in my spares department under pax seat, but am prep
ared
>>> to offer a modest price for another unwanted Ducatti!
>>> Regards, David
>>>
>>> "nigel_graham@m-tecque.co.uk" <nigel_graham@m-tecque.co.uk> wrote:
>>>
>>>>
>>>> I have followed this discussion with great interest and with an
>>>> increasing sense of D=E9j=E0 vu.
>>>> When the issue of regulator/rectifier failures occur withing the Rotax
>>>> community, the standard fix seems to be to simply replace like with li
ke
>>>> (at elevated Rotax pricing) and fly on until the next unit fails.
>>>>
>>>> Up until about five years ago, nearly all modern Japanese motorcycles
>>>> used the same technology as that found on the Rotax 91x series engines
,
>>>> permanent-magnet generators controlled by SCR rectifier/regulators. I
t may
>>>> come as some surprise that for an industry renowned for precision and
>>>> reliability, nearly all of these major motorcycle manufactures have at
some
>>>> time, been plagued by problems with their SCR based rectifier/regulato
rs
>>>> failing and burning out alternators and wiring, cooking batteries and
in
>>>> extreme cases, squirting unregulated AC into the wiring loom and blowi
ng up
>>>> ECUs. It was just such a failure that "sparked" my interest :-(
>>>>
>>>> Known as "Shunt Regulators" the SCR technology runs extremely hot and
>>>> requires more cooling air than modern styling and space allows.
>>>> The solution was a move towards MOSFET controlled regulators and the
>>>> numerous web-based one-make discussion groups were full of information
and
>>>> advice on the reasons for failure, the benefits of the change and prac
tical
>>>> advice on how to convert.
>>>>
>>>> It was by trawling these groups that I was able to build up a good
>>>> understanding of how these R/Rs worked, what was causing the problem a
nd
>>>> what the potential solution might be. I compiled what I considered to
be
>>>> the best informed snippets of information into the attached document.
>>>> The first half gives an overview of a typical design of an SCR
>>>> Rectifier/Regulator for use on a permanent-magnet generating system an
d the
>>>> second half discussed the relative merrits of SCR versus MOSFET.
>>>>
>>>> It would be interesting to know which technology the the after-market
>>>> Schicker and Silent-Hektic R/Rs use.
>>>>
>>>> Nigel
>>>>
>>>
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