 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Jeff(at)rmmm.net
Guest
|
 Posted: Fri Jun 11, 2010 2:32 pm Post subject: Dog box size and flap. |
 |
|
On the figures below I would like to see pictures of the opening if
possible. When I take Goldrush down for the winter annual I was going
to start cutting on the dog box to reduce it and fix a flap. I would
like to see what others have done to reduce the box size and opening
if possible. I now have much lower temps. I can't get the CHT's to
break 250 F even on a hot day climb.
Hey Paul... did you ever get your mods on that completed? Just curious.
Jeff R. N128LJ Gold Rush
On Jun 11, 2010, at 4:27 PM, Thomas Scherer wrote:
| Quote: |
>
.
.
> Ok, sounds good.
>> You close your cooling flap. How much faster you are flying after
>> that?
> 5 knots difference between the flap open (which is about the fixed
> position of a standard Europa aircraft) and cruise setting (= almost
> closed, flush with the bottom of the fuselage).
.
.
Five knots ? Is it ok if I beg to be surprised ?
BTW, when will Texel be ?
|
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
| Back to top |
|
 |
frans(at)privatepilots.nl
Guest
|
| Posted: Fri Jun 11, 2010 3:02 pm Post subject: Dog box size and flap. |
|
|
On 06/12/2010 12:30 AM, JEFF ROBERTS wrote:
| Quote: | On the figures below I would like to see pictures of the opening if
possible. When I take Goldrush down for the winter annual I was going to
start cutting on the dog box to reduce it and fix a flap. I would like
to see what others have done to reduce the box size and opening if
possible. I now have much lower temps. I can't get the CHT's to break
250 F even on a hot day climb.
|
Reducing the inlet opening doesn't imply higher temperatures. The
standard inlet is way to large: that area of air can never go through
the radiator at the speed it enters. So a lot of turbulence is the
result. A smaller opening with a properly designed diffuser will give
more efficient cooling, with less drag.
To reduce cooling, you can use a cowl flap. In cruise, where you spend
most of the time, you need less cooling than during take off. You can
use the cowl flap to direct the air parallel to the aircraft while
cruising, and releasing it with the same speed as the air around it.
This is a further reduction of cooling drag and turbulence.
The standard exit is angled too steep, so the air curves around the
outlet and produces turbulence. Also the exit is too large, larger than
the void can be filled with air entering the cowl, or passing through
the dual radiators.
It all adds up.
If you want to clean up the airplane, on the Europa the cowling is the
place where you can gain the most.
If I'm back from Popham, I will see if I can post some pictures.
Frans
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
