Agreed..... But better the battery before the radios ;-) when that terrible r
egulator design goes south. I am amazed it got certified....truly amazed.
> On Jan 21, 2014, at 3:33 PM, houlihan <houlihan@blueyonder.co.uk> wrote:
>
> 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> wr
ote:
>>> 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 sto
ps 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 or A
C onto the bus giving your expensive radio and other clever stuff a real har
d 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 slightly
changed , one wire not connected, and the generator fail light has to becom
e an LED.
>>>
>>> Tim
>>>
>>>
>>>
>>>> On 21 January 2014 19:13, David Joyce <davidjoyce@doctors.org.uk> wrote
:
g.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. How
ever my personal solution is to take the odd Ducatti at sale price off anyo
ne not planning to fit them and fly with a spare! In 1000hrs I have had one f
ailure. That was inconveniently 1/3 way between Holland and Clacton, but the
re was enough juice in the battery to get me all the way home with a bit of t
houghtful systems management. I currently fly with Rowland's spurned new Duc
atti in my spares department under pax seat, but am prepared to offer a mode
st 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 increa
sing sense of D=C3=A9j=C3- vu.
>>>>> When the issue of regulator/rectifier failures occur withing the Rotax
community, the standard fix seems to be to simply replace like with like (a
t elevated Rotax pricing) and fly on until the next unit fails.
>>>>>
>>>>> Up until about five years ago, nearly all modern Japanese motorcycles u
sed the same technology as that found on the Rotax 91x series engines, perm
anent-magnet generators controlled by SCR rectifier/regulators. It may come a
s some surprise that for an industry renowned for precision and reliability,
nearly all of these major motorcycle manufactures have at some time, been p
lagued by problems with their SCR based rectifier/regulators failing and bur
ning out alternators and wiring, cooking batteries and in extreme cases, squ
irting unregulated AC into the wiring loom and blowing up ECUs. It was just s
uch a failure that "sparked" my interest :-(
>>>>>
>>>>> Known as "Shunt Regulators" the SCR technology runs extremely hot and r
equires more cooling air than modern styling and space allows.
>>>>> The solution was a move towards MOSFET controlled regulators and the n
umerous web-based one-make discussion groups were full of information and ad
vice on the reasons for failure, the benefits of the change and practical ad
vice on how to convert.
>>>>>
>>>>> It was by trawling these groups that I was able to build up a good und
erstanding of how these R/Rs worked, what was causing the problem and what t
he potential solution might be. I compiled what I considered to be the best i
nformed snippets of information into the attached document.
>>>>> The first half gives an overview of a typical design of an SCR Rectifi
er/Regulator for use on a permanent-magnet generating system and the second h
alf discussed the relative merrits of SCR versus MOSFET.
>>>>>
>>>>> It would be interesting to know which technology the the after-market S
chicker and Silent-Hektic R/Rs use.
>>>>>
>>>>> Nigel
>>>>
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