Today's Message Index:
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1. 05:22 AM - Re: Unequal fuel tank levels (Zed Smith)
2. 06:40 AM - Re: Unequal fuel tank levels (n85ae)
3. 08:16 AM - test (Dan)
4. 08:27 AM - Re: test (Ken Arnold)
5. 11:32 AM - CH701 POH (Ken Arnold)
6. 12:54 PM - Re: Shoulder Harness attachment (n85ae)
7. 02:46 PM - Re: CH701 POH (John Swanson)
8. 05:19 PM - Re: Shoulder Harness attachment (Viper_on_line)
Message 1
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| Subject: | Re: Unequal fuel tank levels |
do not archive
Gravity-induced air leakage is the problem.
One wing, being slightly lower than the other, upsets the intended equal distribution
of fuel.
This then results in massive amounts of air getting into the higher tank.
A two-inch left-to-right tilt is nearly one-half the depth of the 701 tanks; nearly
one-half the capacity.
A wise old ag pilot once told me that the prop was just a big fan....it is there
to keep the pilot cool.
He went on to say that if the fan stops you can see the pilot sweat.
Those with unequal fuel levels may need to install an auxillary air pump to replenish
the tank with less air. This may help to keep the fan running.
Everybody have a nice day, and straighten up and fly right-hand patterns!!
Zed
Message 2
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| Subject: | Re: Unequal fuel tank levels |
If you guys REALLY want to understand why the fuel level is different,
then you have to drop the simplistic view.
Go to Google and search on "fluid dynamics hydraulic head", it's not
completely simple but this is the explanation as to why the difference.
There are a great number of factors that are at play, the end result is
pressure differential across the tanks
Regards,
Jeff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 3794#203794
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test
do not archive
Message 4
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good test Dan,
do not archive
----- Original Message -----
From: "Dan" <dwilde@clearwire.net>
Sent: Thursday, September 11, 2008 11:13 AM
Subject: Zenith701801-List: test
>
> test
> do not archive
>
>
>
>
>
Message 5
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Hi Listers,
I have a draft of the subject. Still needs some tweaks. Anyone wanting
to take a look is welcome.
Please contact me directly via my e-mail address.
Regards,
Ken
do not archive
Message 6
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| Subject: | Re: Shoulder Harness attachment |
Something to think about, because Zenith sure did not do their engineering
calculation with regard to the seatbelts.
I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if
indeed the rivets don't pull out before that. So I replaced them with 4130
steel the same thickness which I bolted with AN3's to the fueslage longerons. I
also added structure to the center console.
Crash impacts can go up to 40/50G's and be survivable, so I'm not sure
what they were thinking when the designed the stock ones. But they were
not designed to handle more than the bare minimum.
I suppose if I crash that hard I might not survive anyway, but I sure don't
want to leave on account the seat belt tabs sheared.
Jeff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 3870#203870
Message 7
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----- Original Message -----
From: Ken Arnold
To: zenith-list@matronics.com
Sent: Thursday, September 11, 2008 2:30 PM
Subject: Zenith701801-List: CH701 POH
Hi Listers,
I have a draft of the subject. Still needs some tweaks. Anyone
wanting to take a look is welcome.
Please contact me directly via my e-mail address.
Regards,
Ken
do not archive
KenI would like to see ur Poh I hope
have my 701 flying this month.CH701 912 ULSJohn Swanson
-------------------------------------------------------------------------
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Checked by AVG - http://www.avg.com
9/11/2008 7:03 AM
Message 8
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| Subject: | Re: Shoulder Harness attachment |
Thanks Guys,
The load dissipation of the seat belt mount can become intricate when you can't
get to a longeron as in the case of the shoulder harness. And then as has been
said is the 0.063 going to be going to be strong enough to prevent the bolt
ripping out if you make the mounting structure too strong? I think it is better
to have the seatbelt support structure crumple but keep you at least partially
secure than have the belt bolt rip out.
At this stage the plan is to increase the shoulder harness attachment brackets
to 0.093 and using Larry's idea of a cross fuselage support at the front/rear
baggage shelf junction and the zee channel all secured with A5 rivets. To spread
the load I am using .040 L's from the centre of the cross fuselage harness
support (long name?) to the back corners of the rear baggage shelf. Thus creating
a truss of the rear baggage shelf and spreading the load hopefully over the
whole area.
Does that sound suitable to the more engineering minded of you? [Question]
--------
701 scratch builder
one day it will fly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 3905#203905
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