Today's Message Index:
----------------------
1. 03:03 AM - Re: Re: How many 18T's (Richard Goode)
2. 03:07 AM - Fuel flow from tanks (Dr. Robert Schroeder)
3. 09:07 AM - Re: Fuel flow from tanks (Brian Lloyd)
4. 12:48 PM - Re: fuel flow from tanks (Rob Rowe)
5. 01:35 PM - Re: Re: fuel flow from tanks (A. Dennis Savarese)
6. 02:15 PM - =?US-ASCII?B?UkU6IFlhay1MaXN0OiBmdWVsIGZsb3cgZnJvbSB0YW5rcw==? (michael@wikstrom.cc)
7. 02:47 PM - Yaks on the EAA Daily Update (Hartley)
8. 06:38 PM - Re: fuel flow from tanks (Rob Rowe)
Message 1
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| Subject: | Re: How many 18T's |
We have 24 on the Hungarian register [they were fully certificated in
Hungary],most of which are based in the UK.
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Eric Wobschall
Sent: 24 July 2011 14:39
Subject: Re: Yak-List: Re: How many 18T's
Occurs to me that I haven't heard of many (any?) 18Ts in the US. There must
be a couple, though.
On Jul 23, 2011, at 4:42 AM, Keith Pickford wrote:
New Zealand
1 - 18T
16 - 52's
2 - 55's
--- On Sat, 23/7/11, Yakbaas <riaan@golfcartpro.co.za> wrote:
From: Yakbaas <riaan@golfcartpro.co.za>
Subject: Yak-List: Re: How many 18T's
<x-msg://89/mc/compose?to=riaan@golfcartpro.co.za> MailScanner has detected
a possible fraud attempt from "x-msg:" claiming to be
riaan@golfcartpro.co.za>
And here I thought I could get a 18T census through a decent post??
[Evil or Very Mad]
Back to topic
In SA we have 8
France :3
Germany :10
Austria:1
UK must have ,Richard?
Aus :How many Chris?
Canada:Everybody must know the Granley's
PS .I feel more at ease in my 18T than in a soft-spar 52 during aero's
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| Subject: | Fuel flow from tanks |
Thank you all,
I will be more attuned to the fuel usage and lift that heavy wing up.
Kelley Monroe and I will recheck the vent line later this week.
Your guidance will no doubt result in happier less stressed pilot!
Off to OSH.
ras
Dr. Robert A. Schroeder
Schroeder Fire Inc.
612.922.2349
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| Subject: | Re: Fuel flow from tanks |
On Mon, Jul 25, 2011 at 3:04 AM, Dr. Robert Schroeder <Firedog@visi.com>wrote:
> Thank you all,****
>
> ** **
>
> I will be more attuned to the fuel usage and lift that heavy wing up.
> Kelley Monroe and I will recheck the vent line later this week.****
>
> Your guidance will no doubt result in happier less stressed pilot!
>
I can attest to the fact that landing with the engine still running is far
less stressful than landing with the engine not running.
Have fun at OSH guys!
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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| Subject: | Re: fuel flow from tanks |
Robert,
FWIW on YAK-52s I've found the following are the most common causes of fuel imbalance
... many I expect will be common to CJs too.
- prolonged orbits or circuits in one direction
- flown with slip ball out of balance (high tank feeds, low tank receives more
overflow)
- slip gauge incorrectly aligned or aircraft rigged out of trim
- feed check valve install orientation can impact fuel flow preference or may be
contaminated (sticking)
- fuel caps seals stretched (from prolonged over-tightening : tank pressure drops
to above wing pressure reducing feed/increasing return fuel)
- vents blocked by debris or insects
- aircraft with individual tank vents ... outlets not equally aligned with slipstream
- vent/fuel pipes dented/kinked
Subtle changes can create big imbalance situations the devils in the detail!
If you've suddenly experienced a fuel imbalance problem then a simple check is
to exchange the fuel caps to see if one of their seals has stretched ... if the
problem swap sides you'll have localised the problem.
Cheers, Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347676#347676
Message 5
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| Subject: | Re: fuel flow from tanks |
One factor not mentioned is and especially with the single vent tube Yak
52's, when the fuel tanks are full and the airplane sits on the ramp in
the hot sun, the fuel expands and the ONLY 2 places place it can expand
to is into the vent line and into the header tank which can expand into
the vent system as well. Once the fuel enters the vent line, the tank
with the fuel-blocked vent line will not feed properly. The tell-tale
sign is fuel venting out of the belly vent line while sitting on the
ramp in the hot sun.
Ever open a fuel tank cap and have the fuel gush out onto the wing? You
can go to the bank the vent line is full of fuel.
The best thing a person can do when this happens is to blow the vent
system for each tank individually by opening one cap at a time,
connecting a piece of hose on the vent tube exiting from the belly and
blow back through the vent. This will in most cases push the fuel in the
vent line back into the tank. You may also push more fuel out of the
fuel cap as well. Then cap the tank and move to the other tank and do
the same thing.
There is one exception to this though. If the header tank vent tube LOOP
is not far enough above the junction where all the vent lines come
together, the header tank fuel vent will continue to fill the right tank
vent line because it is the lower than the right tank vent line where it
attaches to the vent junction (on the 52). So be sure to check the vent
loop from the header tank to the vent junction and make sure the loop is
going well above the floor in the rear cockpit (where the header tank is
installed).
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 7/25/2011 2:44 PM, Rob Rowe wrote:
> --> Yak-List message posted by: "Rob Rowe"<yak-list@robrowe.plus.com>
>
> Robert,
>
> FWIW on YAK-52s I've found the following are the most common causes of fuel imbalance
... many I expect will be common to CJs too.
>
> - prolonged orbits or circuits in one direction
> - flown with slip ball out of balance (high tank feeds, low tank receives more
overflow)
> - slip gauge incorrectly aligned or aircraft rigged out of trim
> - feed check valve install orientation can impact fuel flow preference or may
be contaminated (sticking)
> - fuel caps seals stretched (from prolonged over-tightening : tank pressure drops
to above wing pressure reducing feed/increasing return fuel)
> - vents blocked by debris or insects
> - aircraft with individual tank vents ... outlets not equally aligned with slipstream
> - vent/fuel pipes dented/kinked
>
> Subtle changes can create big imbalance situations the devils in the detail!
>
> If you've suddenly experienced a fuel imbalance problem then a simple check is
to exchange the fuel caps to see if one of their seals has stretched ... if
the problem swap sides you'll have localised the problem.
>
> Cheers, Rob R
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=347676#347676
>
>
Message 6
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| Subject: | =?US-ASCII?B?UkU6IFlhay1MaXN0OiBmdWVsIGZsb3cgZnJvbSB0YW5rcw==? |
Good Evening
I some times have the problem in my 18T that it pulls more fuel from the left tank
and I sometime end up with an empty left tank and a lot of fuel in the right
one.
If I take care and watch the wing level and keep the ball in the center while cruising
I manage to keep the tanks equal, but if I dont pay attention, the left
one will go
dry first.
Still not sure if this was the cause but I once returned from Corsica back to Cannes,
at 8000 feet and I had my left tank empty lights on for a while
with the right one almost 90 liters.
At 22 miles off the coast of Cannes, I was advised of some IFR traffic for Nice
Airport and I was asked to expedite to 1500 feet. I did a steep decent at 300km/hr
with gills closed etc.
When I leveled out at 1500 feet the engine had stopped, except for a wind milling
prop. As I had my empty tank lights still in my head, I instinctively made
a left 60 deg bank turn, to get the full fuel tank high up in the air, and at
the same time hand pumping the cylinder side quite fast. I completed one turn
and the engine came to life at about 1000 feet and I continued to Cannes without
any more problems.
Some people said I had a carb ice problem and some, including me, think it was
an air bubble that probably came from the left tank, maybe induced by the rapid
decent.
Weather was good, outside temperature around 25 degC.
Carb heat was not on during the decent.
Since then, I watch my fuel levels much more and I will not have this happen again
22 miles from the coast. For about a minute I thought we were going to be
swimming,
me, my wife and my dog
Michael Wikstrom
La Colle sur Loup (06)
France
Tel : +33 607 44 40 11
email: michael@wikstrom.cc
Yak 18T - HA-YAI
Yak 3U - D-FAFL
Message 7
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| Subject: | Yaks on the EAA Daily Update |
Check out the CJ/Yak guys made it to the EAA daily update. Yes, the link i
s safe.
-Postal
http://bcove.me/bbfgdcl8
Message 8
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| Subject: | Re: fuel flow from tanks |
Good point Dennis ... had not included it as I gathered the SOP on single vent
YAK-52s was not to brim full tanks to avoid vent feed issue & in extremis expansion
overflow from vent creating a siphoning effect. Addressed by the separate
tank vents introduced from mid-1989+ production aircraft ... albeit in doing
so creating further variables that can impact fuel imbalance.
Also my understanding was that this was primarily a ground issue (other than the
header tank loop exception mentioned) and that once the engine was started and
a few litres consumed the common vent/return lines (single belly vent aircraft)
to each tank would no longer be fuel-blocked. Have I missed something here?
However it does give me pause for further thought on how the separately vented
tank aircraft (mid-1989+) might be impacted by expansion fuel trapped in the vent
lines as these would not be cleared post engine start given this design has
given them individual vent loops now independent of the fuel return lines. As
the tank belly vents are angled into the airflow the positive pressure in-flight,
coupled with a slight additional pressure drop (beyond that created by fuel
usage) in the fuel trapped vent tank, suggests that any trapped vent fuel
would be brought back into the tank. Conjecture on my part ... what do you think?
Thanks, Rob
On 7/25/2011 8:35 PM, Dennis Savarese wrote:
> One factor not mentioned is ....
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347708#347708
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