Today's Message Index:
----------------------
1. 05:41 AM - Yak 55M fuel system (Dan caldwell)
2. 07:43 AM - Re: Yak 55M fuel system (Corey Middaugh)
3. 07:43 AM - Re: Yak 55M fuel system (Corey Middaugh)
4. 08:14 AM - Re: Yak 55M fuel system (Richard Goode)
5. 09:05 AM - Housai CHT on shutdown (NebraskaYak)
6. 09:42 AM - Re: Housai CHT on shutdown (Justin Drafts)
7. 10:09 AM - Re: Housai CHT on shutdown (Walter Lannon)
8. 10:10 AM - Re: Housai CHT on shutdown (Ernest Martinez)
9. 11:24 AM - Re: Housai CHT on shutdown (Greg Wrobel)
Message 1
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| Subject: | Yak 55M fuel system |
I need some inside information from you Yak gurus concerning the Yak55M fuel system.
In order to maximize competitive aerobatic performance I would prefer to launch
with just enough fuel to complete the sequence, descend in the box and land with
the minimum safe fuel.
In the event of a runway closure due to an accident, etc. which might cause an
unexpected delay, is the 2.5 minute inverted fuel tank available?
I can see holding inverted for 2.5 minutes while the runway is being cleared but
will the remaining fuel then drain back in to the inverted tank when I roll
upright and lead to fuel starvation?
Thanks,
Dan Caldwell
N55KV
Sent from my iPad
Message 2
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| Subject: | Re: Yak 55M fuel system |
Well how big of a boy are ya? 2.5 gals is about 15 pounds. Maybe an exercise
program and fly in flip flops and shorts will get gross weight down. Nothing worse
then flying to sequence and having to do the math in your head and how much
fuel you have left, or maybe there is something worse.......dead sticking a
manhole cover in. ;)
Comrade C-Dog
Yak55M N555LL
Sent from my iPhone
> On Sep 15, 2016, at 5:40 AM, Dan caldwell <sailor2645@aol.com> wrote:
>
>
> I need some inside information from you Yak gurus concerning the Yak55M fuel
system.
> In order to maximize competitive aerobatic performance I would prefer to launch
with just enough fuel to complete the sequence, descend in the box and land
with the minimum safe fuel.
> In the event of a runway closure due to an accident, etc. which might cause an
unexpected delay, is the 2.5 minute inverted fuel tank available?
> I can see holding inverted for 2.5 minutes while the runway is being cleared
but will the remaining fuel then drain back in to the inverted tank when I roll
upright and lead to fuel starvation?
> Thanks,
> Dan Caldwell
> N55KV
>
> Sent from my iPad
>
>
>
>
>
>
Message 3
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| Subject: | Re: Yak 55M fuel system |
Well how big of a boy are ya? 2.5 gals is about 15 pounds. Maybe an exercise
program and fly in flip flops and shorts will get gross weight down. Nothing worse
then flying to sequence and having to do the math in your head and how much
fuel you have left, or maybe there is something worse.......dead sticking a
manhole cover in. ;)
Comrade C-Dog
Yak55M N555LL
Sent from my iPhone
> On Sep 15, 2016, at 5:40 AM, Dan caldwell <sailor2645@aol.com> wrote:
>
>
> I need some inside information from you Yak gurus concerning the Yak55M fuel
system.
> In order to maximize competitive aerobatic performance I would prefer to launch
with just enough fuel to complete the sequence, descend in the box and land
with the minimum safe fuel.
> In the event of a runway closure due to an accident, etc. which might cause an
unexpected delay, is the 2.5 minute inverted fuel tank available?
> I can see holding inverted for 2.5 minutes while the runway is being cleared
but will the remaining fuel then drain back in to the inverted tank when I roll
upright and lead to fuel starvation?
> Thanks,
> Dan Caldwell
> N55KV
>
> Sent from my iPad
>
>
>
>
>
>
Message 4
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| Subject: | Yak 55M fuel system |
There is no such thing as an "inverted fuel tank". The wing tanks (sometimes
only one on a 55) drain into a collector tank of 2.5 L under the floor. This
has a flop-tube which means it will pick up fuel in any attitude and is the
only fuel supply for the aircraft. So it is not suddenly available for
emergency inverted flight!
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Dan caldwell
Sent: 15 September 2016 13:40
Subject: Yak-List: Yak 55M fuel system
I need some inside information from you Yak gurus concerning the Yak55M fuel
system.
In order to maximize competitive aerobatic performance I would prefer to
launch with just enough fuel to complete the sequence, descend in the box
and land with the minimum safe fuel.
In the event of a runway closure due to an accident, etc. which might cause
an unexpected delay, is the 2.5 minute inverted fuel tank available?
I can see holding inverted for 2.5 minutes while the runway is being cleared
but will the remaining fuel then drain back in to the inverted tank when I
roll upright and lead to fuel starvation?
Thanks,
Dan Caldwell
N55KV
Sent from my iPad
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Message 5
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| Subject: | Housai CHT on shutdown |
Hi Guys,
Looking for advice on lowering CHT for shutdown on my Housai engine. It easily
cools to 160C but takes forever to get below 150C. Any recommendations of what
to adjust or change?
Thanks,
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460481#460481
Message 6
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| Subject: | Re: Housai CHT on shutdown |
Hello Andrew -
I thought I was the only one with cool-down issues!
My engine is a stock Housai, and I've found it helpful on these
stubborn-CHT occasions (after I've run it at 1500 rpm for 15+ seconds) to
open the oil cooler door and gill shutters wide, and keep the rpm at
1100-1200. It seems counterintuitive to run the engine at a higher rpm to
cool it, but I figure its both circulating oil and forcing air over the
cylinders, but on many occasions I've watched the CHT noticeably drop by
doing this. Making sure your oil level is on the high end will help as
well; for me this means at or above 13 on the stick.
Occasionally, on a very warm day, my CHT just will NOT come below
155/160-deg C, no matter what I've done. On these occasions I just shut
down, and close the gill shutters to force the engine temp to drop more
slowly to ambient, hopefully reducing the thermal stress.
Hopefully this is helpful-
Justin Drafts
N280NC
On Thu, Sep 15, 2016 at 12:04 PM, NebraskaYak <andrew.malousek@comcast.net>
wrote:
> >
>
> Hi Guys,
>
> Looking for advice on lowering CHT for shutdown on my Housai engine. It
> easily cools to 160C but takes forever to get below 150C. Any
> recommendations of what to adjust or change?
>
> Thanks,
> Andrew
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460481#460481
>
>
Message 7
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| Subject: | Re: Housai CHT on shutdown |
Try oil scavenge run 1 min at 1400 RPM with gills full open or some
variation thereof.
In summer I usually shut down at 150C or just under. Probably run out of
gas waiting for 140C.
Walt
-----Original Message-----
From: NebraskaYak
Sent: Thursday, September 15, 2016 9:04 AM
Subject: Yak-List: Housai CHT on shutdown
Hi Guys,
Looking for advice on lowering CHT for shutdown on my Housai engine. It
easily cools to 160C but takes forever to get below 150C. Any
recommendations of what to adjust or change?
Thanks,
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460481#460481
Message 8
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| Subject: | Re: Housai CHT on shutdown |
I find when I turn off the mag switch it cools off considerably
On Thursday, September 15, 2016, NebraskaYak <andrew.malousek@comcast.net>
wrote:
> <javascript:;>>
>
> Hi Guys,
>
> Looking for advice on lowering CHT for shutdown on my Housai engine. It
> easily cools to 160C but takes forever to get below 150C. Any
> recommendations of what to adjust or change?
>
> Thanks,
> Andrew
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460481#460481
>
>
Message 9
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| Subject: | Re: Housai CHT on shutdown |
If OAT is 25C or above temp can VFR at 165C. Below 25C then 150C. Part of
my before landing checklist besides gear mixture and prop is to open my
shutters to get the engine cooled down.
On Sep 15, 2016 11:09 AM, "NebraskaYak" <andrew.malousek@comcast.net> wrote:
> >
>
> Hi Guys,
>
> Looking for advice on lowering CHT for shutdown on my Housai engine. It
> easily cools to 160C but takes forever to get below 150C. Any
> recommendations of what to adjust or change?
>
> Thanks,
> Andrew
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460481#460481
>
>
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