From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Re. Rescaling the EM2 to metric
Date: Sun, 24 Jun 2018 09:47:57 +0800
References: <list-11295196@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-11295196@logan.com>
Message-Id: <2BB896F5-A4C8-4C76-B707-6C89D9127901@gmail.com>

Thanks Todd

Steve

> On 24 Jun 2018, at 6:23 am, Andrew Martin andrew@martinag.com.au =
<flyrotary@lancaironline.net> wrote:
>=20
> Thanks Todd. This is very good info for making the EM2 just that bit =
more user friendly for me. Is your airspeed cal in mph or knots?
> Andrew
>=20
> On Sun, 24 Jun 2018 at 5:59 am, Todd Bartrim bartrim@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Below is my EM2 calibration data table. I hope it comes through to the =
list OK, otherwise I'll post a link.
> The only Dynon I have is the D10A, which is just flight instruments, =
so other than sharing a pitot probe there is nothing common. The Dynon =
has it's own OAT sensor which is connected through the EDC magnetometer =
(electronic compass)
>=20
> EM2 Calibration Data
> Ch. #	Function	Scale Factor	Zero Offset	Sensor Offset	=
Low Limit	Hi Limit	sensor type	location
> 0	H2O temp	3.152	20	447		100	VDO 323 =
095	H2O out of engine, before cooler
> 1	Aux air 2	3.6	0	69			LM34DZ	=
behind right radiator air
> 2	aux LT 1	1.825	20	490			VDO ? =
323 057	Oil Sump, before cooler
> 3	RT fuel	0.572	511	756			SW F-385C	=
Right Outboard tank
> 4	oil temp	3.219	20	445		90	VDO 323 =
095	Oil into engine, after cooler
> 5	LT fuel	0.784	511	828			SW F-385B	=
Left Outboard tank
> 6	aux air 3						=09
> 7	aux LT 2	3.114	20	446			VDO 323 =
095	H2O into engine, after cooler
> 8	oil press	9.436	0	55	25	95	VDO 360 =
086D	Oil into engine, after cooler & filter
> 9	H2O press	32.211	0	88		21	VDO 360 =
043	Coolant swirl bottle
> 10	aux air 1	8.105	0	176			LM34DZ	=
behind left radiator air
> 11	OAT	8.666	0	439			LM34DZ	under =
right wing root
> 12	fuel press	13.7	0	99			VDO 360 =
086	fuel rail loop
> 13	mixture	5.119	0	0			=09
> 14	air speed	10.008	0	46	45	200	=09
> 15	altitude	3.598	-50	7542			=09
> 16	CHT 1	0.454	0				J type TC	=
fuel filter/water seperator
> 17	CHT 2	0.454	0				J type TC	=
MOCAL oil inlet
> 18	CHT 3	0.454	0				J type TC	=
MOCAL H2O inlet
> 19	CHT 4	0.454	0				J type TC	=
various, currently cowl air out
> 20	EGT 1	1.046	0			950	K type TC	=
Rotor #1 exhaust
> 21	EGT 2	1.046	0			950	K type TC	=
Rotor #2 exhaust
> 22	EGT 3	1.046	0			950	K type TC	=
TIT, turbo inlet
> 23	EGT 4	1.046	0			500	K type TC	=
exhaust pipe 30" downstream of turbo
> 24	MAP	13.639	30.029	371			=09
> 25	voltage	6.277	10	0	130	155	=09
>=20
> The temp sensor that is in the oil sump (aux LT 1,channel 2) has far =
different cal data as the other VDO temp sensors. I'm not sure where I =
got it from and it has no markings on it, but it's ohmic range matches =
the published data for a VDO 323 057 (max 150C), so I'm assuming that is =
what it is, but take that one with a measure of skepticism. It =
calibrated fine so I'm using it for now, but my next order from ACS will =
include a new VDO 323 095, to match the others.
>=20
> Todd
>=20
> Todd Bartrim
>=20
> On Sat, Jun 23, 2018 at 4:42 AM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Hi there Todd
> I=E2=80=99d be very interested in the settings though I have an EM3 =
and I=E2=80=99m not sure of the difference between models 2 and 3.
> Do you have all seperate senders for the Em2 and Dynon?
>=20
> Steve Izett
>=20
>=20
>=20
>=20
> > On 23 Jun 2018, at 5:33 pm, Todd Bartrim bartrim@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > Ok, as I can never leave well enough alone, I took another look at =
this.
> >   First as soon as I took a moment I realized that the J&K =
thermocouple would be real easy to calibrate and convert to metric.=20
> >   I used a Fluke temperature calibrator with a millivolt output to =
simulate the TC"s. Worked like a charm.=20
> >   I tried to use the same calibrator to simulate the variable =
resistance of the VDO probes, but they are thermistors which are very =
non-linear, so even with the tables it was a challenge.
> >   So I brought home a Fluke 9009 dual dry block temperature =
calibrator. Good for -20=C2=B0C up to 350=C2=B0C at the same time =
(separate temp wells).
> >   That made it easy, fast and very accurate.=20
> >   However, the one that I'm worried about is the OAT as this one is =
also used to calculate TAS, HP, and "other readings".
> > Now I believe I can correct the TAS by calibrating the scale factor =
on the airspeed in flight against the TAS on my Dynon.
> > HP is an arbitrary number anyways based on what I think my max HP =
should be. I think I can tweak that factor as well to get it back to =
what I think it should be. And if I ever meet a Dyno I'll be sure to try =
to calibrate it properly.=20
> >   But the manual also mentions "other readings" without details.
> > So I've put in an email to Tracy.
> > If it turns out to be important, I can always put this one back and =
just ignore the OAT. (Its also on the Dynon)
> >   So if any of you metric blokes down under would like to do this, I =
can post all the parameters which you can input to your own EM2 and it =
will get you close.
> >   For very accurate calibration you would have to tweak them a bit =
using a temperature calibrator.=20
> >=20
> > Todd
> >=20
> > On Fri, Jun 8, 2018, 00:46 Todd Bartrim bartrim@gmail.com, =
<flyrotary@lancaironline.net> wrote:
> > Hi Andrew;
> >  I haven't spent much further time on the metric conversion. I think =
it wouldn't be as simple as I hoped. It was fairly straight forward to =
convert the fuel level to litres and most of the temp measurements =
should be almost as easy, but the K & J thermocouples have different raw =
data, that I don't believe would be easy to convert. And then some of =
the calculated parameters will likely be adversely affected as well. =
Probably not impossible, but first, I just don't have the time and =
second, I would probably have to be bugging Tracy a lot for info and =
he's busy being retired in the mountains of Colorado where he seems to =
be online only occasionally.
> >    I have however longed for a data-logger which the early EM2 =
didn't have (I have #003). With the increasing popularity of hobby =
microcontrollers I can get a Ardurino microcontrollers for $35 and a =
datalogger for it for $6, so I just asked Tracy about the possibility of =
harvesting data from the EM2.
> >   However for a few other reasons, I'm considering that next time =
someone on the list is selling an EM3 from an abandoned project, I might =
buy it for an upgrade. I think there was one recently but it was bought =
up right away.
> >=20
> > Todd Bartrim
> >=20
> > On Thu, Jun 7, 2018 at 7:58 PM, Andrew Martin andrew@martinag.com.au =
<flyrotary@lancaironline.net> wrote:
> > Todd, did you ever get the EM2 recalibrated to metric? I never =
attemped this as doing so usually gives me quite a few hours work to get =
back to a working system. I used Tracy=E2=80=99s factory calibration in =
the EM2 as the base to calibrate my efis, which is in metric. It is a =
minor inconvienience to do the mental arithmetric when comparing =
instruments, but would be interesting to know if you succeeded.
> > --=20
> > Regards Andrew Martin Martin Ag
> >=20
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   =
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>=20
> --=20
> Regards Andrew Martin Martin Ag