Today's Message Index:
----------------------
1. 12:32 AM - Re: Question for 914 users (conrad)
2. 02:51 AM - Re: Re: Question for 914 users (Kingsley Hurst)
3. 03:00 AM - Re: Re: Question for 914 users (Gilles Thesee)
4. 11:05 AM - rotax Tacho verses digital (graeme bird)
5. 11:18 AM - Re: rotax Tacho verses digital (Robert Borger)
6. 11:46 AM - Re: rotax Tacho verses digital (Pete Lawless)
7. 11:57 AM - Re: rotax Tacho verses digital (Frans Veldman)
8. 01:02 PM - Re: rotax Tacho verses digital (Mark Burton)
9. 01:33 PM - Re: Re: rotax Tacho verses digital (Peter Jeffers)
10. 08:07 PM - Re: Re: Question for 914 users (Kingsley Hurst)
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| Subject: | Re: Question for 914 users |
*Warning*
Do not attempt to take off with the TCU disabled. If the wastegate is fully closed
when the TCU is powered down you will end up over boosting your engine with
the possibility of twisting a crankshaft or burning a piston
kingsnjan(at)westnet.com. wrote:
> Peter,
>
> Having said that, I can certainly try a T/O with the TCU turned off to observe
what happens.
>
>
>
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387748#387748
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| Subject: | Re: Question for 914 users |
Conrad,
Thank you very much for the sage advice. Just thinking....... I don't really need
to know what happens!
Cheers
Kingsley
Sent from my iPhone
On 13/11/2012, at 6:32 PM, "conrad" <conrad@conairsports.co.uk> wrote:
>
> *Warning*
> Do not attempt to take off with the TCU disabled. If the wastegate is fully closed
when the TCU is powered down you will end up over boosting your engine with
the possibility of twisting a crankshaft or burning a piston
>
>
>
> kingsnjan(at)westnet.com. wrote:
>> Peter,
>>
>> Having said that, I can certainly try a T/O with the TCU turned off to observe
what happens.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=387748#387748
>
>
>
>
>
>
>
>
>
>
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| Subject: | Re: Question for 914 users |
Kingsley Hurst a crit :
>
> Conrad,
>
> Thank you very much for the sage advice. Just thinking....... I don't really
need to know what happens!
>
Kingsley,
Just to make sure. Have you checked that the throttle cables do respond
correctly to the throttle lever movements ?
IIRC, there have been some instances of cables buckling instead of
sliding in their outer cases when one relies only on springs to open the
butterflies in the carburettors.
To prevent this situation, our airplanes are equipped with solid piano
wire 'cables' providing some push-pull action. The carb springs are just
there for peace of mind.
FWIW,
Best regards,
--
Gilles
http://contrails.free.fr
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| Subject: | rotax Tacho verses digital |
Interesting that compared to my new digital tacho that controls the VP prop, the
rotax tacho over-reads by around 150rpm. Id trust the digital rather than the
needle but I wondered if anyone else has found the same?
while mentioning needles - my flight sunday took me past a couple.
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W
Newby: 35 hours
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387771#387771
Attachments:
http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg
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| Subject: | Re: rotax Tacho verses digital |
Graeme,
Beautiful picture!
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Nov 13, 2012, at 1:05 PM, graeme bird <graeme@gdbmk.co.uk> wrote:
Interesting that compared to my new digital tacho that controls the VP prop, the
rotax tacho over-reads by around 150rpm. Id trust the digital rather than the
needle but I wondered if anyone else has found the same?
while mentioning needles - my flight sunday took me past a couple.
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W
Newby: 35 hours
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387771#387771
Attachments:
http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg
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| Subject: | rotax Tacho verses digital |
Hi Graeme
Has the Rotax tacho been calibrated? If not they are often inaccurate. Mine
certainly was.
Regards
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of graeme bird
Sent: 13 November 2012 19:05
Subject: Europa-List: rotax Tacho verses digital
Interesting that compared to my new digital tacho that controls the VP prop,
the rotax tacho over-reads by around 150rpm. Id trust the digital rather
than the needle but I wondered if anyone else has found the same?
while mentioning needles - my flight sunday took me past a couple.
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W
Newby: 35 hours
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387771#387771
Attachments:
http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg
--
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| Subject: | Re: rotax Tacho verses digital |
On 11/13/2012 08:05 PM, graeme bird wrote:
> Interesting that compared to my new digital tacho that controls the
> VP prop, the rotax tacho over-reads by around 150rpm. Id trust the
> digital rather than the needle but I wondered if anyone else has
> found the same?
As far as I know it can be somewhat tricky to connect two tacho's at the
same time. It is a weird interface, nor digital nor analogue. You can't
trust either of them. If you really want to know, you'd better check the
rpm against a seperate rev counter on the prop and recalculate this to
engine RPM and see if it matches with any of your gauges.
> while mentioning needles - my flight sunday took me past a couple.
Very nice! I presume this was in the UK? Is this near land's end?
Frans
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| Subject: | Re: rotax Tacho verses digital |
Hi,
The Rotax tacho really cannot be trusted. Many years ago, one of my customers told
me that when he fitted a CSC-1/P constant speed controller, it showed 600
RPM more than the Rotax tacho! So when the customer thought he was using around
5700 RPM on takeoff he had actually been using 6300 every time. Somewhat ironic
that installing the CS controller actually reduced his takeoff performance
by about 10% (but hopefully prolonged the life of his 912S).
The Rotax tacho has a little pot in it you can twiddle to adjust the displayed
RPM but it's impossible to get at when the thing is in situ. Also, if memory serves
me right, Rotax decreed that it should be calibrated something like every
50 hours!
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387781#387781
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| Subject: | Re: rotax Tacho verses digital |
My experience would show as with Mark that the Rotax RPM gauges are not to
be trusted. My original was some 200rpm under reading when new. Europa re
calibrated it but some 2 years later it had gone way out again. I rely on
the digital readout from my EIS from Grand Rapids.
Pete Jeffers
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Mark Burton
Sent: 13 November 2012 21:02
Subject: Europa-List: Re: rotax Tacho verses digital
Hi,
The Rotax tacho really cannot be trusted. Many years ago, one of my
customers told me that when he fitted a CSC-1/P constant speed controller,
it showed 600 RPM more than the Rotax tacho! So when the customer thought he
was using around 5700 RPM on takeoff he had actually been using 6300 every
time. Somewhat ironic that installing the CS controller actually reduced his
takeoff performance by about 10% (but hopefully prolonged the life of his
912S).
The Rotax tacho has a little pot in it you can twiddle to adjust the
displayed RPM but it's impossible to get at when the thing is in situ. Also,
if memory serves me right, Rotax decreed that it should be calibrated
something like every 50 hours!
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387781#387781
-----
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Message 10
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| Subject: | Re: Question for 914 users |
Gilles,
Thank you again. Yes the levers on the carbs move in unison no matter how fast
the throttle lever is advanced. The whole operation is very smooth and fluent.
I'm no expert on any of this stuff I can assure you but I would expect the engine
not to run smoothly if a throttle cable was to lag the throttle movement.
The engine runs like a sewing machine and my only observation is that the MAP seems
slower to rise than expected be it true or imaginary! Hence my dilemma.
Best regards
Kingsley
Sent from my iPhone
On 13/11/2012, at 9:00 PM, Gilles Thesee <Gilles.Thesee@ac-grenoble.fr> wrote:
>
> Kingsley Hurst a crit :!
>>
>
> Kingsley,
>
> Just to make sure. Have you checked that the throttle cables do respond correctly
to the throttle lever movements ?
> IIRC, there have been some instances of cables buckling instead of sliding in
their outer cases when one relies only on springs to open the butterflies in
the carburettors.
>
> To prevent this situation, our airplanes are equipped with solid piano wire 'cables'
providing some push-pull action. The carb springs are just there for peace
of mind.
>
> FWIW,
> Best regards,
> --
> Gilles
> http://contrails.free.fr
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