Today's Message Index:
----------------------
1. 12:03 AM - Matronics List Fund Raiser - 2007 List of Contributors (Matt Dralle)
2. 09:32 AM - Prop Tach Sender (rampil)
3. 10:44 AM - Re: Prop Tach Sender (Mark Burton)
4. 11:12 AM - Re: Re: Prop Tach Sender (Terry Seaver (terrys))
5. 11:25 AM - Re: Prop Tach Sender (Mark Burton)
6. 11:52 AM - Re: Prop Tach Sender (rampil)
7. 11:55 AM - Re: Prop Tach Sender (Paul Stewart)
8. 12:37 PM - the eternal subject of props (William Daniell)
9. 01:20 PM - Re: Prop Tach Sender (rampil)
10. 02:49 PM - Re: Re: Prop Tach Sender (Simon Smith)
11. 04:15 PM - Rotax 912 run on (David Joyce)
Message 1
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Subject: | Matronics List Fund Raiser - 2007 List of Contributors |
Dear Listers,
I would like to thank everyone that made a Contribution in support of the Lists
this year! It was really nice to hear all great comments people had regarding
the Lists! As I have said many times before, running these Lists is a labor
of love. Your generosity during the List Fund Raiser underscores the great sentiments
people have made regarding the Lists.
If you haven't yet made a Contribution in support of this year's Fund Raiser please
feel free to do so. The great List Fund Raiser gifts will be available on
the Contribution site for just a little while longer, so hurry and make your
Contribution and get your great gift! Once again, the URL for the Contribution
web site is:
http://www.matronics.com/contribution
I would like to thank Andy Gold of the Builder's Bookstore ( http://www.buildersbooks.com ), Jon Croke of Homebuilt HELP ( http://www.homebuilthelp.com ) and Bob Nuckolls of AeroElectric ( http://www.aeroelectric.com ) for their extremely generous support during this year's Fund Raiser through the contribution of discounted merchandise. These are great guys that support the aviation industry and I encourage each and every Lister to have a look at their products. Thank you Andy, Jon and Bob!! Your support is very much appreciated!
And finally, below you will find a web link to the 2007 List of Contributors current
as of 12/6/07! Have a look at this list of names as these are the people
that make all of these List services possible! I can't thank each of you enough
for your support and great feedback during this year's Fund Raiser!
THANK YOU!
http://www.matronics.com/loc/2007.html
I will be shipping out all of the gifts in the next few weeks and hope to have
everything out by the end of the month. In most cases, gifts will be shipped
via US Postal Service.
Once again, thank you for making this year's List Fund Raiser successful!
Best regards,
Matt Dralle
Matronics Email List Administrator
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Subject: | Prop Tach Sender |
Greetings All,
A tech tidbit for the group.
I have been investigating why my prop tach sensor doesn't work and
finally discovered the solution, which I put forth for other who may
wind up in this boat.
I have an AirMaster prop and a Blue Mountain EFIS. So far there is no
way for the BMA to read the engine RPM signal (although that may
change soon). The AirMaster hub has a magnet embedded in it's contact
plate for its own internal RPM sensing. Since I could not expose the
electric RPM signal, I put my own Hall effect sensor on a bracket mounted
to the Rotax gear box of my 912uls. The sensor I used is a Westach
720-12R.
This sensor never produced a pulse train signal for the Blue Mountain
to analyze.
I finally put a scope on the probe and discovered that indeed not pulses
were generated by a spinning prop. (I really did not want my scope
that close to the spinning prop ;-) )
It turns out that the Hall Effect sensor uses a neat integrated sensor
chip which it turns out is sensitive only to a SINGLE magnetic polarity.
By random chance, AirMaster uses the wrong one. (North vs South, etc).
The Westach pulses just fine when I swish a different magnet past it.
It turns out that Westach can build the probe with sensitivity to the
opposite magnet face. The part number is you need this new probe
is 720-12RAM. Same price as the original 720-12R probe.
Hope this solves someone else's mystery too!
Ira N224XS
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150815#150815
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Subject: | Re: Prop Tach Sender |
Hi Ira,
Don't you still need a tacho of some kind showing engine RPM (rather than prop
RPM)?
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150826#150826
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Subject: | Re: Prop Tach Sender |
Hi Mark,
The Katana airplanes and motor gliders which use the 912 or 914 have a
tach which shows prop speed, not engine speed. It provides numbers more
familiar to pilots of other planes powered by direct drive engines.
When I checked out in the 912 powered DA-20 I found the prop-speed tach
readings were easily understood because they were similar to the tach
numbers of the Lycoming and Continental powered planes I had flown
before. When we started flying our Europa with an engine-speed tach it
took longer to get accustomed to the numbers seen, and what they meant.
Regards,
Terry Seaver
A135 / N135TD
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Mark Burton
Sent: Thursday, December 06, 2007 10:41 AM
Subject: Europa-List: Re: Prop Tach Sender
Hi Ira,
Don't you still need a tacho of some kind showing engine RPM (rather
than prop RPM)?
Cheers,
Mark
Message 5
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Subject: | Re: Prop Tach Sender |
Hi Terry,
I suspect that in the UK we must have a tacho showing engine RPM. Can anyone confirm
whether the PFA require that or not?
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150833#150833
Message 6
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Subject: | Re: Prop Tach Sender |
Hi All,
As it turns out I have the new UMA Rotax-specific tach which
shows engine revs. I just wanted to RPM recorded on the EFIS for
flight testing since I am a quant.
Honestly though, I can imagine why the PFA would insist on engine speed.
The ratio is fixed at 2.43!
Redline 5750(engine) = 2366(prop)
Max Cont 5500 = 2264 prop
Cruise 5000 = 2060 prop
The redlines don't move, who care what the underlying number is.
Actually, if PFA insists, I'd like to hear their reasoning
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150839#150839
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Subject: | Re: Prop Tach Sender |
Ira
It certainly solves a problem for us as we approach running the
engine for the first time with our BMA E1. We have a 720-12R but
haven't fitted it yet. Very interested in how you have it configured
- channel etc. Where exactly across the radius of the contact plate
is the embedded magnet - if you had a photo of your set up? Did you
get your probe from Westach direct or via ACS?
Regards
Paul
G-GIDY
(running out of jobs to do!!!!!)
On 6 Dec 2007, at 17:29, rampil wrote:
>
> Greetings All,
>
> A tech tidbit for the group.
>
> I have been investigating why my prop tach sensor doesn't work and
> finally discovered the solution, which I put forth for other who may
> wind up in this boat.
>
> I have an AirMaster prop and a Blue Mountain EFIS. So far there is no
> way for the BMA to read the engine RPM signal (although that may
> change soon). The AirMaster hub has a magnet embedded in it's contact
> plate for its own internal RPM sensing. Since I could not expose the
> electric RPM signal, I put my own Hall effect sensor on a bracket
> mounted
> to the Rotax gear box of my 912uls. The sensor I used is a Westach
> 720-12R.
>
> This sensor never produced a pulse train signal for the Blue Mountain
> to analyze.
>
> I finally put a scope on the probe and discovered that indeed not
> pulses
> were generated by a spinning prop. (I really did not want my scope
> that close to the spinning prop ;-) )
>
> It turns out that the Hall Effect sensor uses a neat integrated sensor
> chip which it turns out is sensitive only to a SINGLE magnetic
> polarity.
> By random chance, AirMaster uses the wrong one. (North vs South, etc).
> The Westach pulses just fine when I swish a different magnet past it.
>
> It turns out that Westach can build the probe with sensitivity to the
> opposite magnet face. The part number is you need this new probe
> is 720-12RAM. Same price as the original 720-12R probe.
>
> Hope this solves someone else's mystery too!
>
> Ira N224XS
>
> --------
> Ira N224XS
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=150815#150815
>
>
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Subject: | the eternal subject of props |
Is anyone using IVOPROP?
Will
19:31
Message 9
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Subject: | Re: Prop Tach Sender |
Hi Paul,
Here are pix of my original bracket holding a 720-4 sensor which did
not work either (longer story).
The new bracket has an L on top to position the 720-12 in apposition
to the magnetic slug which you will find just outside the outermost
conductor ring. On my prop the magnet is buried in light-colored epoxy.
If needed, I can photo the new set-up when next at the hangar.
I purchased the new sender directly from Westach, the original from
ACS
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150854#150854
Attachments:
http://forums.matronics.com//files/dscn0594sm_159.jpg
http://forums.matronics.com//files/dscn0587sm_958.jpg
Message 10
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Subject: | Re: Prop Tach Sender |
There is a C of A Tecnam that live at Perth (EGPT) that has a Gauge that
shows Prop RPM not engine.
Simon
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Mark Burton
Sent: 06 December 2007 19:24
Subject: Europa-List: Re: Prop Tach Sender
Hi Terry,
I suspect that in the UK we must have a tacho showing engine RPM. Can anyone
confirm whether the PFA require that or not?
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=150833#150833
Message 11
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Subject: | Rotax 912 run on |
Thanks for all the replys, I will check the results and report back to the
list....
rgds
David J Joyce G-BWON
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