Today's Message Index:
----------------------
1. 07:34 AM - Re: ASI accuracy (Robert Rehmel)
2. 07:49 AM - Static Port Location (Steve Danielson)
3. 08:41 AM - Re: Static Port Location (jackie b johnson)
4. 09:07 AM - Re: ASI accuracy (Bryan Martin)
5. 09:19 AM - Re: Static Port Location (Philip Polstra)
6. 10:23 AM - Re: ASI accuracy (Bill Morelli)
7. 01:13 PM - wiring info ()
8. 02:40 PM - Jabiru engine (Jason Cantrell)
9. 03:30 PM - Re: Jabiru engine (Jeff Small)
10. 04:18 PM - Re: ASI accuracy (Jeff Small)
11. 07:29 PM - Re: ASI accuracy (Magnus Matthiasson)
12. 07:42 PM - Land on the ice - ARE YOU NUTS!! (Bill Morelli)
Message 1
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| Subject: | Re: ASI accuracy |
--> Zenith-List message posted by: "Robert Rehmel" <traveler601@earthlink.net>
I am getting to the point were I am having to consider placement of the
static port. I was thinking of putting in the same area as on a Piper 140
or a Cessna 172, but I have read a few say they have them on the tail
section. Do you get better readings if the static port is further aft than
up front?
> [Original Message]
> From: Grant Corriveau <grantC@ca.inter.net>
> To: <zenith-list@matronics.com>
> Date: 12/30/2002 8:32:22 AM
> Subject: Re: Zenith-List: ASI accuracy
>
> --> Zenith-List message posted by: Grant Corriveau <grantC@ca.inter.net>
>
> on 02/12/29 05:36, Richard McLachlan at richard@foxfield.demon.co.uk
wrote:
>
> > The previous owner says that this is the cause of the
> > problem, as the pressure in the cabin is significantly lower at speed,
but I
> > am
> > not sure this is correct. As I am coming to the CH601 with a totally
Cessna
>
> ... Due to the shape of the canopy, fuselage sides, etc.,, the localized
> pressure inside the cockpit is obviously lower than ambient pressure,
> resulting in an increased pressure differential between static and pitot
--
> so artificially fast readings on the gauge. This has been mentioned
before
> on the list (archives) and I imagine most builders now use an external
> static source for more accurate readings.
>
> A GPS showing groundspeed could be a good safety device until you've
> re-calibrated the system. Assuming you have some idea of the prevailing
> wind, you will know what to expect from the groundspeed readout crossing
the
> threshold.
> --
> Grant Corriveau
> Montreal
> Zodiac 601hds/CAM100
> C-GHTF
>
>
>
>
>
--- Robert Rehmel
--- traveler601@earthlink.net
Message 2
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| Subject: | Static Port Location |
--> Zenith-List message posted by: "Steve Danielson" <steved@nc.rr.com>
How about the pitot tubes that have a 2nd tube and a static port. Is anyone
using those and having any success?
Steve
Message 3
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| Subject: | Re: Static Port Location |
--> Zenith-List message posted by: "jackie b johnson" <zjohnson@ucnsb.net>
That's what I use..on left wing..came from ACS
-----Original Message-----
From: Steve Danielson <steved@nc.rr.com>
Subject: Zenith-List: Static Port Location
>--> Zenith-List message posted by: "Steve Danielson" <steved@nc.rr.com>
>
>How about the pitot tubes that have a 2nd tube and a static port. Is anyone
>using those and having any success?
>
>Steve
>
>
Message 4
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| Subject: | Re: ASI accuracy |
--> Zenith-List message posted by: Bryan Martin <bryanmmartin@comcast.net>
> --> Zenith-List message posted by: "Robert Rehmel" <traveler601@earthlink.net>
>
>
> I am getting to the point were I am having to consider placement of the
> static port. I was thinking of putting in the same area as on a Piper 140
> or a Cessna 172, but I have read a few say they have them on the tail
> section. Do you get better readings if the static port is further aft than
> up front?
I suspect you would get a more accurate reading with the forward location,
there is less airflow disturbance there. The latest versions of the kit have
the static port located on a tube adjacent to the pitot tube. It consists of
a 1/4" steel tube with the end welded closed and three small holes drilled
in the sides of the tube. This tube is welded in place parallel to the pitot
tube.
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
Airframe construction complete.
Working on instrument panel, electrical and interior.
do not archive.
Message 5
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| Subject: | Static Port Location |
--> Zenith-List message posted by: "Philip Polstra" <ppolstra@mindspring.com>
--> Zenith-List message posted by: "Steve Danielson" <steved@nc.rr.com>
How about the pitot tubes that have a 2nd tube and a static port. Is anyone
using those and having any success?
I have this setup, which I bought from Aircraft Spruce. It works fine.
---
Message 6
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| Subject: | Re: ASI accuracy |
--> Zenith-List message posted by: Bill Morelli <billvt@together.net>
I thought I would be smart and place my static ports on the fuselage sides
(up front) just like most of the Cessna's I have flown. So I purchased two
of those static ports and spent a good amount of time mounting one on each
side of the fuse.
Bad Idea!!! First flight, the airspeed would not indicate below 80 mph!!! I
climbed to 6000 feet and slowed to see at what speed a stall would occur
and as I slowed, the IAS dropped to 80 mph and that's it. I had my GPS on
so I could see my ground speed dropping off and the stall did happen right
around the ZAC numbers (58 mph - HDS).
Next flight I pulled the static line off the ASI and let it vent into the
cabin. Now the IAS was more in line with the GPS and it now indicated below
80 knots as I slowed.
I contacted a professor on line (I'm still looking for his replay and a
diagram he sent to me) who was an expert on this sort of thing. He said
that the ideal place for static ports is in the rear of the fuselage (Beech
and Piper I think put them there). The diagram he sent to me (I'll share it
when I find it) showed the pressure drops along the entire fuselage of a
typical aircraft and the area that is least affected by the airflow past
the fuselage is in the rear.
I since have run my line to a small port that I mounted at the rear of the
center wing on the bottom and now my IAS is fine.
The other place that a lot of builders use and seems to work well is out by
the pitot tube as ZAC shows in their manual.
So now I have these cute static ports on my fuselage sides that are not
used. I will probably leave them there as I don;t really want to patch the
holes if I remove them.
Regards,
Bill (N812BM - HDS - Tri - Stratus - Vermont - 187.2 flight hrs. - 291
landings)
web site -> http://homepages.together.net/~billvt/
> I am getting to the point were I am having to consider placement of the
>static port. I was thinking of putting in the same area as on a Piper 140
>or a Cessna 172, but I have read a few say they have them on the tail
>section. Do you get better readings if the static port is further aft than
>up front?
Message 7
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--> Zenith-List message posted by: <jensenm33@sbcglobal.net>
Does anyone have wiring information for a Genave Marker beacon receiver,
model Delta 303 with the lights attached to the end of the case. There
is a 4 pin connector. SN is 56-82 if that helps. Genave says they no
longer have any information on this model. If they don't who does???
Jerry Jensen
Message 8
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--> Zenith-List message posted by: "Jason Cantrell" <jcnc@dixie-net.com>
Hello everyone,
I have been looking at the 3300 engine made by Jabiru to put in my 601xl, and read
that the company doesn't use gaskets between the heads and the block.
Has anyone experience any trouble with oil leakage with this design. I know they
recommend torque the heads after the first 5 hours of flight.
Thanks for the information
do not archive
Message 9
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| Subject: | Re: Jabiru engine |
--> Zenith-List message posted by: "Jeff Small" <zodiacjeff@msn.com>
>I have been looking at the 3300 engine made by Jabiru to put in my 601xl,
and read that the company doesn't use gaskets between the heads and the
block.
>Has anyone experience any trouble with oil leakage with this design. I know
they recommend torque the heads after the first 5 hours of flight.
Hi Jason,
While I can't attest to the "gasket or no" question I can share some info on
the others.
You torque the heads at 5, 10, 15 and 25 hours. After that you do it as
part of "usual maintenance." I plan on changing oil and doing the check
every forty hours from here out.
During the head torque routine you also check/set the valves. The whole
process takes about 60 to 90 minutes - and I always have a second set of
eyes going over everything under the cowl while doing this.
I used Aeroshell 100 straight mineral oil (50 SAE) during break-in. At 32
hours I switched to Aeroshell 15-50 semi-synthetic.
During those 32 hours the engine used a little more than 1/2 quart of the
break-in oil.
I have some "weepage" where the sump bolts up to the crankcase - very minor,
doesn't even drip into cowl.
Regards Jeff engine 33A51
Message 10
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| Subject: | Re: ASI accuracy |
--> Zenith-List message posted by: "Jeff Small" <zodiacjeff@msn.com>
>I thought I would be smart and place my static ports on the fuselage sides
>(up front) just like most of the Cessna's I have flown. So I purchased two
>of those static ports and spent a good amount of time mounting one on each
>side of the fuse.
>Bad Idea!!! First flight, the airspeed would not indicate below 80 mph!!!
I was hoping that Bill would weigh in with this info and here's some more.
Since the wx here was much better than expected I ran some ASI/IAS/TAS tests
today to cap that section of AC90-89 for my flight test phase.
Conditions seemed to indicate tests at 3000 feet best. OAT was 42F and the
winds aloft for my area had wind directly from west at 36 kts at 6000 feet.
Using the true airspeed calculator on Bill's site:
Level at 3000, 000 heading on the vertical card compass (22Tango is a simple
a/c, no gyros)showed course of 011 and 135 mph on the GPS.
Heading of 240 showed 239 at 95.5 mph.
Heading 120 produced 117 and 129 mph.
On all of these courses the ASI showed 121 to 122 mph - 2640 rpm on the Jab
3300. The air was as smooth as I've seen and allowed this sort of "flying
with the trims" type of flight.
Bill's calculator works this out to be TAS of 119.
Now with the E6B in the Garmin 196:
Altitude was 2500, magnetic heading of 270, barometer was 29.98, ASI still
showing 121. The Garmin gave 123 as TAS. Winds figured out to be 276 at 27
mph.
I'll get some figures at 7000 feet when the opportunity presents itself.
<How about the pitot tubes that have a 2nd tube and a static port. Is anyone
<using those and having any success?
My pitot and static are the cheap ACS model 15144 mounted just aft of the
spar on the left wing, about midway out the length of the LE tank. Hooked
to the ASI with poly tubing through holes protected with nylon snap
bushings. I think I can replace this should it become necessary without
even dropping the wing.
Sometimes cheap and simple works! I've always felt, even on the first
flight, that my ASI was + or - 5 mph, just by what I was seeing outside.
I'm sure that there are other ways to go, this works for me - and I am in no
way an authority on the subject!
Also, FWIW to those in the planning stages: put everything you can on the
right wing. you need that weight out there, your butt takes care of the
left side.
Hey, Happy New Years to all! May you have blue skies, tailwinds, and
perfects flares.
Regards Jeff HDS/3300 (only 1.8 and I'm off the leash!)
Message 11
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--> Zenith-List message posted by: "Magnus Matthiasson" <dofra@simnet.is>
Hi eweryone
In my opininion the static should be in the same place as the pitot.
Why?
The pitot is mesuring the the action presure direct foreward,
and the static is mesuring the nautical presure (no action presure)
so if you place the two mesuremems at the same place they will
messure the differense of eatche other?
In my opinion, the best place to locate the two propes is together
(side by side)
HAPPY NEW YEAR 2003
Magnus Matthiasson
Iceland
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com]On Behalf Of Jeff Small
Subject: Re: Zenith-List: ASI accuracy
--> Zenith-List message posted by: "Jeff Small" <zodiacjeff@msn.com>
>I thought I would be smart and place my static ports on the fuselage sides
>(up front) just like most of the Cessna's I have flown. So I purchased two
>of those static ports and spent a good amount of time mounting one on each
>side of the fuse.
>Bad Idea!!! First flight, the airspeed would not indicate below 80 mph!!!
I was hoping that Bill would weigh in with this info and here's some more.
Since the wx here was much better than expected I ran some ASI/IAS/TAS tests
today to cap that section of AC90-89 for my flight test phase.
Conditions seemed to indicate tests at 3000 feet best. OAT was 42F and the
winds aloft for my area had wind directly from west at 36 kts at 6000 feet.
Using the true airspeed calculator on Bill's site:
Level at 3000, 000 heading on the vertical card compass (22Tango is a simple
a/c, no gyros)showed course of 011 and 135 mph on the GPS.
Heading of 240 showed 239 at 95.5 mph.
Heading 120 produced 117 and 129 mph.
On all of these courses the ASI showed 121 to 122 mph - 2640 rpm on the Jab
3300. The air was as smooth as I've seen and allowed this sort of "flying
with the trims" type of flight.
Bill's calculator works this out to be TAS of 119.
Now with the E6B in the Garmin 196:
Altitude was 2500, magnetic heading of 270, barometer was 29.98, ASI still
showing 121. The Garmin gave 123 as TAS. Winds figured out to be 276 at 27
mph.
I'll get some figures at 7000 feet when the opportunity presents itself.
<How about the pitot tubes that have a 2nd tube and a static port. Is anyone
<using those and having any success?
My pitot and static are the cheap ACS model 15144 mounted just aft of the
spar on the left wing, about midway out the length of the LE tank. Hooked
to the ASI with poly tubing through holes protected with nylon snap
bushings. I think I can replace this should it become necessary without
even dropping the wing.
Sometimes cheap and simple works! I've always felt, even on the first
flight, that my ASI was + or - 5 mph, just by what I was seeing outside.
I'm sure that there are other ways to go, this works for me - and I am in no
way an authority on the subject!
Also, FWIW to those in the planning stages: put everything you can on the
right wing. you need that weight out there, your butt takes care of the
left side.
Hey, Happy New Years to all! May you have blue skies, tailwinds, and
perfects flares.
Regards Jeff HDS/3300 (only 1.8 and I'm off the leash!)
Message 12
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| Subject: | Land on the ice - ARE YOU NUTS!! |
--> Zenith-List message posted by: Bill Morelli <billvt@together.net>
Yesterday I went up for flight and just after takeoff, one of my fellow
EAA members calls me on the radio and says hey Bill I'm up over Highgate
Center (Northern end of Lake Champlain) at 1000 feet and I'm going to land
on the ice. The pilot, Don, is 75 years old (or young) and flies a Citabria
(he also has a Cessna Skylane). So I fly up to where he is and locate him
circling in his bright red Citabria. He says "follow me" so I do, we start
a descent for the ice. I'm thinking what the heck is this thing going to do
on ice???? Well, Don lands and I follow and land behind and to the left of
him. There were ice fisherman all over the place watching us come in. The
ice was smooth as silk and the HDS only got a bit squirrely on the roll out.
So, there you have it, another first for me and my HDS.
What a hoot!!!!!
do not archive.
Regards,
Bill (N812BM - HDS - Tri - Stratus - Vermont - 187.2 flight hrs. - 291
landings, 1 ON ICE!!)
web site -> http://homepages.together.net/~billvt/
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