Today's Message Index:
----------------------
1. 03:13 AM - Re: belt and suspenders (alex trent)
2. 06:58 AM - Re: Re: belt and suspenders (Ray Montagne)
3. 07:38 AM - Re: Re: belt and suspenders (Wayne McIntosh)
4. 07:46 AM - Venturi (Andrew SanClemente)
5. 07:47 AM - Re: Re: belt and suspenders (Ray Montagne)
6. 08:15 AM - Re: Venturi (Thilo Kind)
7. 08:31 AM - Re: Venturi (r.p.reynolds)
8. 08:39 AM - Woodcomp Props (r.p.reynolds)
9. 09:34 AM - Re: Woodcomp Props--pitch setting (Leo J. Corbalis)
10. 09:49 AM - Venturi (Robert Schoenberger)
11. 11:02 AM - Re: Venturi (Thilo Kind)
12. 03:10 PM - Re: Re: belt and suspenders (Thomas F Marson)
13. 03:18 PM - Re: Woodcomp Props (Thomas F Marson)
14. 03:49 PM - Re: Re: belt and suspenders (Ray Montagne)
15. 03:54 PM - Re: Venturi (Thomas F Marson)
16. 05:23 PM - CH-640 Aileron tips. (Jeff Paden)
17. 06:20 PM - Edge spacing for bolts and rivets... (Bima, Martin)
18. 06:43 PM - Inductive tach pick-up... (Bima, Martin)
19. 06:50 PM - Re: Venturi (Brett Ray)
Message 1
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: "alex trent" <atrent7@cogeco.ca>
I believe volts and amps are closely associated when the resistance is
constant. If I raise the voltage then the current will also rise. Any
electric devices that are running soon won't be because of excessive
current. The only thing that may tolerate the voltage without raising the
current may be the battery. One should maintain a watch on all instruments
including the voltmeter. A means off shutting down the alternator is, in my
opinion, a necessary device. (a switched field) It is possible to install
an O/V device and a crowbar if desired. Even put in audible as well as
visual warnings. All this stuff adds to the complexity. The best safety
device is to pay attention to the instruments. I have also seen a/c land
wheels up with the horn blaring and the red lights on.
> Time: 06:43:31 AM PST US
> From: Joemotis@aol.com
> Subject: Re: Zenith-List: >
> --> Zenith-List message posted by: Joemotis@aol.com
>
> An in line fuse will not handle an overvoltage condition. Fuses react to
amps
> over time i.e a slow blow fuse or instantaneously i.e. a standard fuse. A
lot
> of "Buss" style automotive glass tube fuses are rated to 250 volts. But if
> you exceed their current carrying capacity at 12 volts blow they will.
> Joe Motis
Message 2
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: Ray Montagne <ac6qj@earthlink.net>
On 4/3/04 3:12 AM, "alex trent" <atrent7@cogeco.ca> wrote:
> --> Zenith-List message posted by: "alex trent" <atrent7@cogeco.ca>
>
>
> I believe volts and amps are closely associated when the resistance is
> constant.
OHM's law states:
E = I X R
I = E / R
R = E / I
Where:
E = Voltage
I = Current
R = Resistance
DO NOT ARCHIVE
R. Montagne
Cupertino, CA
Message 3
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: "Wayne McIntosh" <mcintosh3017@insightbb.com>
>
>
> I believe volts and amps are closely associated when the resistance is
> constant. If I raise the voltage then the current will also rise.
No it will not as long as the resistance remains constant actually the
current flow will decrease.
Wayne McIntosh Lafayette IN
Message 4
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--> Zenith-List message posted by: Andrew SanClemente <ansancle@townisp.com>
Having scoured the archives, I've noticed almost everyone using a
Venturi disappointed with its performance, independent of location.
One gentleman did remark that mounting underneath fuselage behind
exhaust he was getting good vacuum. My radiator precludes this
location.
Is it a completely insane idea to mount 2 venturi's to drive 2 gyro
instruments?
(I understand the penalties incurred aesthetically and with regards
to drag).
>From what I've read a single 9" seems to pull between 2-4" on average
on 601's so with 2 of them theoretically it should get sufficient
suction (or am I missing some formula with regards to airflow that
makes this untrue?)
Thanks for replies in advance
Andrew
601 HDS Stratus EA-81
Message 5
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: Ray Montagne <ac6qj@earthlink.net>
On 4/3/04 7:38 AM, "Wayne McIntosh" <mcintosh3017@insightbb.com> wrote:
> --> Zenith-List message posted by: "Wayne McIntosh"
> <mcintosh3017@insightbb.com>
>
>>
>>
>> I believe volts and amps are closely associated when the resistance is
>> constant. If I raise the voltage then the current will also rise.
>
> No it will not as long as the resistance remains constant actually the
> current flow will decrease.
> Wayne McIntosh Lafayette IN
>
Actually the current will increase as voltage increases given a constant
resistance. Again, Ohms law states: I = E / R
Given a votage of 10 volts and a resistance of 10 ohms, the current would be
on amp:
10 volts / 10 ohms = 1 amp
Raising the voltage, say to 20 volts, yields an increase in current:
20 volts / 10 ohms = 2 amps
DO NOT ARCHIVE
R. Montagne
Cupertino, CA
Message 6
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--> Zenith-List message posted by: "Thilo Kind" <thilo.kind@gmx.net>
Hi Andrew,
I tried the venturi with only one gyro. Didn't work well - ther was only
enough vacuum during straight and level at cruise speed. Now I have the
electric gyro and am quite happy with that thing.
Happy flying
Thilo Kind
----- Original Message -----
From: "Andrew SanClemente" <ansancle@townisp.com>
Subject: Zenith-List: Venturi
> --> Zenith-List message posted by: Andrew SanClemente
<ansancle@townisp.com>
>
> Having scoured the archives, I've noticed almost everyone using a
> Venturi disappointed with its performance, independent of location.
> One gentleman did remark that mounting underneath fuselage behind
> exhaust he was getting good vacuum. My radiator precludes this
> location.
> Is it a completely insane idea to mount 2 venturi's to drive 2 gyro
> instruments?
> (I understand the penalties incurred aesthetically and with regards
> to drag).
>
> >From what I've read a single 9" seems to pull between 2-4" on average
> on 601's so with 2 of them theoretically it should get sufficient
> suction (or am I missing some formula with regards to airflow that
> makes this untrue?)
>
> Thanks for replies in advance
>
> Andrew
> 601 HDS Stratus EA-81
>
>
Message 7
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--> Zenith-List message posted by: "r.p.reynolds" <r.p.reynolds@blueyonder.co.uk>
Dear Andrew,
I am also having trouble getting the Venturi to give me enough Suck.
I have a 601 UL I have tried Lowering the Venturi about 6 inches from the
bottom of the fus but still no improvement.
When I run one gauge with the venturi the needle on the vacuum gauge goes
off the clock!. But I only get max 4 inches of mercury with both gauges on
line.
Regards
Paul UK Aircraft flown 26 hours.
----- Original Message -----
From: "Andrew SanClemente" <ansancle@townisp.com>
Subject: Zenith-List: Venturi
> --> Zenith-List message posted by: Andrew SanClemente
<ansancle@townisp.com>
>
> Having scoured the archives, I've noticed almost everyone using a
> Venturi disappointed with its performance, independent of location.
> One gentleman did remark that mounting underneath fuselage behind
> exhaust he was getting good vacuum. My radiator precludes this
> location.
> Is it a completely insane idea to mount 2 venturi's to drive 2 gyro
> instruments?
> (I understand the penalties incurred aesthetically and with regards
> to drag).
>
> >From what I've read a single 9" seems to pull between 2-4" on average
> on 601's so with 2 of them theoretically it should get sufficient
> suction (or am I missing some formula with regards to airflow that
> makes this untrue?)
>
> Thanks for replies in advance
>
> Andrew
> 601 HDS Stratus EA-81
>
>
Message 8
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--> Zenith-List message posted by: "r.p.reynolds" <r.p.reynolds@blueyonder.co.uk>
Good Day to all Zenair Fans
Does anyone know what is the Max pitch which can be set on a Woodcomp 3 blade prop
engine is a 912 100HP.
The aircraft has a fantastic take off performance, I would like to reduce the revs
a bit in the cruise. At 5000 revs the Aircraft is doing 95 Knots.
Regards Paul
UK 601UL 26 hours in the air so far.
Message 9
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| Subject: | Re: Woodcomp Props--pitch setting |
--> Zenith-List message posted by: "Leo J. Corbalis" <leocorbalis@sbcglobal.net>
If you have a ground adjustable prop, Measure the current setting and then
increase it by 2 degrees. Test fly, try again until climb really sucks, then
decrease pitch in 1 degree steps until you get the best comprimise setting.
This is the same for all ground adjustable props. If you set the maximum
possible pitch angle you may not get enough speed to takeoff because you
need to get the maximum rated rpm to get full power.
Leo Corbalis>
Message 10
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--> Zenith-List message posted by: "Robert Schoenberger" <hrs1@frontiernet.net>
Thilo . . . What size venturi were you using and with what model plane? Robert
Schoenberger 701
--> Zenith-List message posted by: "Thilo Kind" <thilo.kind@gmx.net>
Hi Andrew,
I tried the venturi with only one gyro. Didn't work well - ther was only
enough vacuum during straight and level at cruise speed. Now I have the
electric gyro and am quite happy with that thing.
Message 11
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--> Zenith-List message posted by: "Thilo Kind" <thilo.kind@gmx.net>
Hi Robert,
I have the 601 HDS (with Rotax 912). Venturi was a 4' if memory serves me
right. The venturi was positioned underneath the cowling / firewall.
Thilo Kind
----- Original Message -----
From: "Robert Schoenberger" <hrs1@frontiernet.net>
Subject: Zenith-List: Venturi
> --> Zenith-List message posted by: "Robert Schoenberger"
<hrs1@frontiernet.net>
>
> Thilo . . . What size venturi were you using and with what model plane?
Robert Schoenberger 701
>
>
> --> Zenith-List message posted by: "Thilo Kind" <thilo.kind@gmx.net>
>
> Hi Andrew,
>
> I tried the venturi with only one gyro. Didn't work well - ther was only
> enough vacuum during straight and level at cruise speed. Now I have the
> electric gyro and am quite happy with that thing.
>
>
Message 12
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: "Thomas F Marson" <tmarson@pressenter.com>
In a DC circuit if the resistance is held constant and the voltage is raised
the current will rise.
In a DC circuit if the voltage is held constant and the resistance is
decreased the current will rise.
I am describing simple OHMs law for Direct Current ( DC). Tom Marson
----- Original Message -----
From: "Wayne McIntosh" <mcintosh3017@insightbb.com>
Subject: Re: Zenith-List: Re: belt and suspenders
> --> Zenith-List message posted by: "Wayne McIntosh"
<mcintosh3017@insightbb.com>
>
> >
> >
> > I believe volts and amps are closely associated when the resistance
is
> > constant. If I raise the voltage then the current will also rise.
>
> No it will not as long as the resistance remains constant actually the
> current flow will decrease.
> Wayne McIntosh Lafayette IN
>
>
Message 13
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| Subject: | Re: Woodcomp Props |
--> Zenith-List message posted by: "Thomas F Marson" <tmarson@pressenter.com>
Most people I talk to who have good experience with the 912S like to cruise
at about 75% power and in level flight have engine RPms right around 5000.
In order to give any advice we need to know what percentage of of total hp
you are at when yu in cruise at 5000 rpm.
Also and maybe more importantly when you are at full throttle in best rate
of climb (VY) what is your rpm?
Also when your plane is in level flight at full throttle what is your RPM?
Tom IN Wis
Good Day to all Zenair Fans
>
> Does anyone know what is the Max pitch which can be set on a Woodcomp 3
blade prop engine is a 912 100HP.
> The aircraft has a fantastic take off performance, I would like to reduce
the revs a bit in the cruise. At 5000 revs the Aircraft is doing 95 Knots.
>
>
Message 14
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| Subject: | Re: belt and suspenders |
--> Zenith-List message posted by: Ray Montagne <ac6qj@earthlink.net>
On 4/3/04 3:09 PM, "Thomas F Marson" <tmarson@pressenter.com> wrote:
> --> Zenith-List message posted by: "Thomas F Marson" <tmarson@pressenter.com>
>
> In a DC circuit if the resistance is held constant and the voltage is raised
> the current will rise.
>
> In a DC circuit if the voltage is held constant and the resistance is
> decreased the current will rise.
>
>> No it will not as long as the resistance remains constant actually the
>> current flow will decrease.
>> Wayne McIntosh Lafayette IN
>>
>>
I absolutely agree with what is said in this post. The previous post did
not say the same thing which is why I offered the correction.
DO NOT ARCHIVE
R. Montagne
Cupertino CA
Message 15
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--> Zenith-List message posted by: "Thomas F Marson" <tmarson@pressenter.com>
If you have larger enough lines and no leaks and clear instrument filters a
4 inch venturi will dependably give enough vacume to run an artificial
Horizon or DG. In fact it can run both at 100 mph.
A 2 inch will run an turn and bank (or turn coordinator as it is now
called).
You may have a leak or leaks, bad instrument or dirty instrument filters.
Tony Binglis SportPlane Construction Techniques has good coverage on this.
Tom inWis.
----- Original Message -----
From: "r.p.reynolds" <r.p.reynolds@blueyonder.co.uk>
Subject: Re: Zenith-List: Venturi
> --> Zenith-List message posted by: "r.p.reynolds"
<r.p.reynolds@blueyonder.co.uk>
>
> Dear Andrew,
> I am also having trouble getting the Venturi to give me enough Suck.
> I have a 601 UL I have tried Lowering the Venturi about 6 inches from the
> bottom of the fus but still no improvement.
> When I run one gauge with the venturi the needle on the vacuum gauge goes
> off the clock!. But I only get max 4 inches of mercury with both gauges on
> line.
>
>
Message 16
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| Subject: | CH-640 Aileron tips. |
--> Zenith-List message posted by: "Jeff Paden" <jeffpaden@madbbs.com>
Well, my building has been set back a couple of days since I have been
fighting with the Aileron tips. All the rest of the parts in the kit are
shipped preformed, however the tips are shipped as just a flat part and I
have to form it to fit the complex shape of the aileron tip. So far I have
three scrap tips and I will keep trying until I find a way to make it
correctly. If anyone reading this has an idea of how to properly do this
then I would sure like to hear from you! Just email me at jeffpaden@madbbs
com with any comments or suggestions.
Thank you all for your help
Jeff Paden
CH-640 builder 90% complete
Message 17
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| Subject: | Edge spacing for bolts and rivets... |
--> Zenith-List message posted by: "Bima, Martin" <mbima@hydro.mb.ca>
Here's a thought...
The edge spacing guidelines is there to make sure we don't rip a bolt
through the sheet metal and out the edge. The 2xD provides the LOAD
enough surface SHEAR AREA to remain below the YIELD STRESS. (any of
this sound familiar to engineers and techs?).
Since the bolts and rivets in the struts are all pulling longitudinally,
or 90 degrees from the edge direction, then we can throw the edge
spacing requirement away and just cross our fingers when we pull out of
a dive at 5.99 G's.
Now if I could convince the inspector, all will be well.
Martin Bima
Winnipeg, Canada
"Birthplace of Princess Auto"
Message 18
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| Subject: | Inductive tach pick-up... |
--> Zenith-List message posted by: "Bima, Martin" <mbima@hydro.mb.ca>
I was actually looking at the Stratomaster Ultra. I will correct myself
now. It says to wrap the pickup wire around the cable from the coil to
the distributor. That's why you have to enter the number of cylinders.
Per rev, it will "feel" 3 spikes. For ten revs it will be thirty, for
1000 revs it would be 3000. Seems acurate.
Martin Bima
Winnipeg, Canada
"100 degree summers and 40 below winters"
Message 19
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--> Zenith-List message posted by: "Brett Ray" <brett@hog-air.com>
I just built one out of sheet aluminum. It sets flush on the bottom of
the plane and works fine. And you can't see it unless you get on your
knees.
Brett
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