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Zenith750-List Digest: 1 Msgs - 12/06/14

 
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Bruce Cruikshank



Joined: 30 Jan 2011
Posts: 6

PostPosted: Sun Dec 07, 2014 9:17 am    Post subject: Zenith750-List Digest: 1 Msgs - 12/06/14 Reply with quote

Jim,

I have a slatless 0-200 powered 750, and use gravity flow, no pumps.  I checked the fuel flow at a 15 degree nose high attitude.  The last 3 gallons drained in 11.75 minutes or a rate of 15.3 GPH.  I have markings on the jury struts that are level with the horizon at 15 degrees nose high.  The problem I had was making a nose low descent into a controlled airport trying to keep up with other traffic.  The engine quite. As I was flaring to land off airport the engine caught.  After landing back at the airport I checked and had 5 gallons of fuel.  So I did a test; in a 6 degree nose low attitude there was 5.2 gallons unusable in the 24 gallon tanks.  I added a 0.8 gallon header tank behind the pilots head to fix the problem.  Many certified high wing airplanes have fuel drains at the front and rear of the tanks. 
On Sun, Dec 7, 2014 at 12:01 AM, Zenith750-List Digest Server <zenith750-list(at)matronics.com (zenith750-list(at)matronics.com)> wrote:
[quote]*

 =========================
   Online Versions of Today's List Digest Archive
 =========================

Today's complete Zenith750-List Digest can also be found in either of the
two Web Links listed below.  The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation.  The .txt file includes the plain ASCII version
of the Zenith750-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.

HTML Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter=2014-12-06&Archive=Zenith750

Text Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter=2014-12-06&Archive=Zenith750


 =======================
   EMail Version of Today's List Digest Archive
 =======================


           ----------------------------------------------------------
                           Zenith750-List Digest Archive
                                      ---
                     Total Messages Posted Sat 12/06/14: 1
           ----------------------------------------------------------


Today's Message Index:
----------------------

     1. 02:02 PM - Re: fuel starvation problem while doing a high angle of attack, power on stall  (j. davis)



________________________________  Message 1  _____________________________________


Time: 02:02:47 PM PST US
Subject: Re: fuel starvation problem while doing a high angle
of attack, power on stall
From: "j. davis" <jwd3ca(at)gmail.com (jwd3ca(at)gmail.com)>

What were your pre-first-flight fuel flow numbers at various fuel levels
and angles of attack?
On 5 Dec 2014 10:52, "Jim Kress" <jim.kress(at)att.net (jim.kress(at)att.net)> wrote:

> On a training flight yesterday in a Zenith STOL 750 with an 0-200 engine
> we experienced a short stoppage of the engine while doing a prolonged high
> angle of attack, power on stall.  We had about half tanks of fuel on
> board.  Once the engine quit we lowered the nose and immediately turned on
> the electric fuel pump. The engine came back to life and the rest of the
> flight was uneventful.  This phenomenon was not experienced during the 40
> hour flight testing period.
> There is a placard advising that the "electric boost pump should be used
> for takeoff and landing", however perhaps this should be changed to say, "
> electric boost pump should be used during training maneuvers and low level
> operations" or something like that.
> Jim Kress CFII
>
> *
>
>
> *
>
>




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PostPosted: Sun Dec 07, 2014 2:41 pm    Post subject: Zenith750-List Digest: 1 Msgs - 12/06/14 Reply with quote

I've also had this happen, it's certainly something you need to be aware can happen and keep your descent shallow when low on fuel. Having a left/right/both/off fuel selector valve is helpful because you can choose the fuller tank to land with, But the header tank solution is the best solution, something I've had on my to-do list for a long time. I'd be interested in more details  of your tank installation. Thanks!

On 7 December 2014 at 12:17, Bruce Cruikshank <n5959z(at)gmail.com (n5959z(at)gmail.com)> wrote:
Quote:
Jim,

I have a slatless 0-200 powered 750, and use gravity flow, no pumps.  I checked the fuel flow at a 15 degree nose high attitude.  The last 3 gallons drained in 11.75 minutes or a rate of 15.3 GPH.  I have markings on the jury struts that are level with the horizon at 15 degrees nose high.  The problem I had was making a nose low descent into a controlled airport trying to keep up with other traffic.  The engine quite. As I was flaring to land off airport the engine caught.  After landing back at the airport I checked and had 5 gallons of fuel.  So I did a test; in a 6 degree nose low attitude there was 5.2 gallons unusable in the 24 gallon tanks.  I added a 0.8 gallon header tank behind the pilots head to fix the problem.  Many certified high wing airplanes have fuel drains at the front and rear of the tanks. 
On Sun, Dec 7, 2014 at 12:01 AM, Zenith750-List Digest Server <zenith750-list(at)matronics.com (zenith750-list(at)matronics.com)> wrote:
Quote:
*

 =========================
   Online Versions of Today's List Digest Archive
 =========================

Today's complete Zenith750-List Digest can also be found in either of the
two Web Links listed below.  The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation.  The .txt file includes the plain ASCII version
of the Zenith750-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.

HTML Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter=2014-12-06&Archive=Zenith750

Text Version:

    http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter=2014-12-06&Archive=Zenith750


 =======================
   EMail Version of Today's List Digest Archive
 =======================


           ----------------------------------------------------------
                           Zenith750-List Digest Archive
                                      ---
                     Total Messages Posted Sat 12/06/14: 1
           ----------------------------------------------------------


Today's Message Index:
----------------------

     1. 02:02 PM - Re: fuel starvation problem while doing a high angle of attack, power on stall  (j. davis)



________________________________  Message 1  _____________________________________


Time: 02:02:47 PM PST US
Subject: Re: fuel starvation problem while doing a high angle
of attack, power on stall
From: "j. davis" <jwd3ca(at)gmail.com (jwd3ca(at)gmail.com)>

What were your pre-first-flight fuel flow numbers at various fuel levels
and angles of attack?
On 5 Dec 2014 10:52, "Jim Kress" <jim.kress(at)att.net (jim.kress(at)att.net)> wrote:

> On a training flight yesterday in a Zenith STOL 750 with an 0-200 engine
> we experienced a short stoppage of the engine while doing a prolonged high
> angle of attack, power on stall.  We had about half tanks of fuel on
> board.  Once the engine quit we lowered the nose and immediately turned on
> the electric fuel pump. The engine came back to life and the rest of the
> flight was uneventful.  This phenomenon was not experienced during the 40
> hour flight testing period.
> There is a placard advising that the "electric boost pump should be used
> for takeoff and landing", however perhaps this should be changed to say, "
> electric boost pump should be used during training maneuvers and low level
> operations" or something like that.
> Jim Kress CFII
>
> *
>
>
> *
>
>




===========
br> fts!)
r> > com" target="_blank">www.aeroelectric.com
w.buildersbooks.com" target="_blank">www.buildersbooks.com
p.com" target="_blank">www.homebuilthelp.com
e.com" target="_blank">www.mypilotstore.com
" target="_blank">www.mrrace.com
target="_blank">http://www.matronics.com/contribution
          -Matt Dralle, List Admin.
===========
br> th750-List" target="_blank">http://www.matronics.com/Navigator?Zenith750-List
===========
FORUMS -
_blank">http://forums.matronics.com
===========






_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
="_blank">www.mypilotstore.com
ank">www.mrrace.com
_blank">http://www.matronics.com/contribution
" target="_blank">http://www.matronics.com/Navigator?Zenith750-List
tp://forums.matronics.com


--
Regards,  J.
-----------------------------
J. Davis,  

- Zenith STOL CH750 C-FJNJ: Jab 3300, Whilrwind GA prop, AeroCarb
- Sonex #325 (ex)C-FJNJ, Jab 3300a, Prince P-Tip, Aerocarb
- former C-IGGY CH701 owner/builder
- see these and more at http://cleco.ca


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