Today's Message Index:
----------------------
1. 05:19 AM - Re: STRATUS/Soob EA-81 Cooling? (fox5flyer)
2. 06:35 AM - Re: Bungee Time!! (Tom Jones)
3. 07:38 AM - Re: STRATUS/Soob EA-81 Cooling? (Lowell Fitt)
4. 10:29 AM - Re: Bungee Time!! (Guy Buchanan)
5. 02:24 PM - Re: STRATUS/Soob EA-81 Cooling? (kirk hull)
6. 07:49 PM - Re: Bungee Time!! (bjones@dmv.com)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: STRATUS/Soob EA-81 Cooling? |
Hi, Andy. Obviously, unless you use a thermostat, the engine temps are
directly affected by outside ambient temps. Higher oat means higher
engine temps. With mine, at about 70 oat, I warm up to 150f for takeoff
and generally by 2k agl engine temps increase to about 195 where they
stay when I level off for cruise. I have my radiator enclosed with
adjustable rear cowl flap so that I have some control over engine temps.
On hot days I keep an eye on the climb temps as they can creep up to
215 or even higher. When that happens I just level off for a little
while, then climb some more. I rarely get more than 4k agl anyway, so
it isn't a problem here in Michigan. The temps you indicate do not seem
extremely high to me. Adding throttle increases power and power
produces heat so it's normal for the temps to rise somewhat. Of course,
no two experimental aircraft setups are the same so, if it is a big
concern, you might take a look at yours to see what you can do to
scavenge more heat out of the cowling/radiator.
Deke
S5/NSI Subaru/CAP
470TT
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bungee Time!! |
Dave, I would say your bungees were manufactured in the 4th quarter of a year ending
in 2 or 7. If you know they are only a couple years old then I say 2007.
Here's everything you ever wanted to know about bungees. AC 43.13-1B Chapter 9.
Bungees are on page 9-2.
http://www.google.com/url?sa=t&source=web&cd=1&sqi=2&ved=0CB8QFjAA&url=http%3A%2F%2Fwww.airweb.faa.gov%2FRegulatory_and_Guidance_Library%255CrgAdvisoryCircular.nsf%2F0%2F99C827DB9BAAC81B86256B4500596C4E%3FOpenDocument&rct=j&q=ac%2043.13-1b&ei=YJwATr_RPJL4swO78qi8DQ&usg=AFQjCNERv5F9Ty8snEnxwHYdDlQ02fYosg&sig2=tHFIIRli0jD2UbF6F5ZvTw&cad=rja
--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343633#343633
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: STRATUS/Soob EA-81 Cooling? |
Andy,
First my disclaimer - I know nothing specifically about the Subaru
installation - but I would like to offer some ideas from other
applications. I have helped build two airplanes and am in my second
Kitfox IV build. I understand that the later model Kitfoxes with
internal radiators have suffered at times from inadequate cooling. I am
currently helping with a Series V with a 7 FWF set-up. It has an
internal radiator and I have been told that the reason for the larger -
by at least a factor of 2 - radiator was to help with cooling, as with
earlier models that was an issue. As I looked over the installation, it
became pretty obvious that the cowl inlet area providing cooling air to
the radiator is considerable larger than the outlet area. Switch to the
Lancair IV I helped with. Given that it is an air cooled engine, and
arguably quite different, what follows might not totally apply, but when
builders of this airplane found cooling problems, the solution was to
decrease - yes decrease - the inlet area. This provided a lower
pressure within the cowl and more smooth, slower flowing air over the
fins which picked up more heat.
With the 7 FWF on the V build, the total outlet area under the cowl is
about 110 in. Sq. The inlet to the radiator is a NACA duct that expands
to the area of the radiator which is about 103 in. sq. Add to that 15
and 17 in. sq. for the oil cooler and the openings on each side of the
spinner and the inlet area to the entire cowl is 135 in. sq. The
general rule of thumb for air cooled is a 1.5 to 1 ratio outlet to
inlet. The Kitfox has it not quite exactly reversed. I think what is
happening in the Kitfox is the inadequate outlet is simply acting like a
dam and the cooling air is simply bypassing the cowl openings seeing
essentially a partially blocked hole. The Speedster radiator shroud I
had on my first Model IV had the inlet to outlet ratio pretty much like
what the Lancair folks found to work best.
All this is opinion, but it may give some suggestions on where to look
regarding possible solutions.
Lowell
From: fox5flyer
Sent: Tuesday, June 21, 2011 5:16 AM
Subject: Re: Kitfox-List: STRATUS/Soob EA-81 Cooling?
Hi, Andy. Obviously, unless you use a thermostat, the engine temps are
directly affected by outside ambient temps. Higher oat means higher
engine temps. With mine, at about 70 oat, I warm up to 150f for takeoff
and generally by 2k agl engine temps increase to about 195 where they
stay when I level off for cruise. I have my radiator enclosed with
adjustable rear cowl flap so that I have some control over engine temps.
On hot days I keep an eye on the climb temps as they can creep up to
215 or even higher. When that happens I just level off for a little
while, then climb some more. I rarely get more than 4k agl anyway, so
it isn't a problem here in Michigan. The temps you indicate do not seem
extremely high to me. Adding throttle increases power and power
produces heat so it's normal for the temps to rise somewhat. Of course,
no two experimental aircraft setups are the same so, if it is a big
concern, you might take a look at yours to see what you can do to
scavenge more heat out of the cowling/radiator.
Deke
S5/NSI Subaru/CAP
470TT
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bungee Time!! |
On 6/20/2011 4:18 PM, Patrick Reilly wrote:
> Dave, I replaced mine with Lowell Fitt's bush gear. Try that. It's
> alot more work and alot more $ but alot more friendly when I'm
> doing ground loops.
Pat,
I like Lowell's gear a lot, but I find I get much better rotation
on my ground loops with the narrow gear. ;-)
Do NOT archive
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 592-C / Warp 3cs / 500 hrs. and grounded
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | STRATUS/Soob EA-81 Cooling? |
My stratus stays at 190 but it also has a thermostat I do have to watch the
oil temps though
_____
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Andy Fultz
Sent: Monday, June 20, 2011 10:48 PM
Subject: Kitfox-List: STRATUS/Soob EA-81 Cooling?
This one is for those of you running a STRATUS or other Subaru EA-81 on your
AVID or KF. What are
your water temps running on take off climb, cruise climb and at cruise? At
what RPM are you running with the temp numbers you are seeing? I'm just a
little concerned with the temps I'm seeing. 180 before take off and then on
climb out I'm seeing the temp go over 200 pretty quick. If I keep it in a
climb 5000 RPM it'll continue to rise to 215 till I pull the power back to
about 4000 and level off and then it will only come back down to around 200
after a while. If I increase the RPM I'll see the temp start to rise again
even if I stay level. OK I'm listening.
Andy F.
7.1 hours since I got my airworthiness last tuesday
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bungee Time!! |
Changed mine about 3 years ago on a 1050. They are still doing thier job.
if you want me to look for stripe colors to see if they match yours let me
know.
bj
KF IV 1050 Rotax 912 warp Drive/nickle edge
Dave, I replaced mine with Lowell Fitt's bush gear. Try that. It's alot
> more
> work and alot more $ but alot more friendly when I'm doing ground loops.
>
> Pat Reilly
> Mod 3 582 Rebuilt
> Rockford, IL
>
> On Mon, Jun 20, 2011 at 5:07 PM, Dave G <d.goddard@ns.sympatico.ca> wrote:
>
>> **
>>
>>
>> I need to replace the saggy old bungees on my Mod IV 1050. I have looked
>> through the archives and determined this is a job for two. If anyone has
>> any
>> ideas that make it quick and easy now would be the time to share.
>>
>> The bungees I am installing are beige with two red and one yellow
>> stripe.
>> Been in the package a couple of years. Anyone care to tell me what this
>> code
>> means cause the ones I am removing are way different for stripes.
>>
>> Thanks
>>
>> Dave G. mod IV 1050 582 Warp.
>>
>> *
>>
>> *
>>
>>
>
>
> --
> Pat Reilly
> Mod 3 582 Rebuild
> Rockford,IL
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|