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marcel.bo(at)hotmail.com
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 Posted: Mon Sep 26, 2016 10:52 am Post subject: Cooling issues on the ground XS 914UL |
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Dear all
Would be very pleased, if you could help me with my cooling issue on the ground by an XS with a 914UL.
I opened another topic, because I didn't build my XS by myself and didn't understand every post in the other
topic. (May it's because of my english knowledge) Another thing is that I have almost no knowledge about
fluid dynamics, therefore I created a picture documentation of my engine bay and list up three ideas which I had.
The ideas are at the end of the documentation. I hope it's helping to explain me some possible solutions.
I'm searching for a solution which is easy to create, because I didn't learn how to work with glass fiber till now.
My CHT is getting high very fast, but only on the ground. On an short airfield, it is even not possible to start after
a quick run up, because the temperature is already around 130°C. It occurs (at least) if the OAT is above 20 to 25°C,
which is quite common in Switzerland (homebase LSZK). The solution which I'm looking for should also work above 30°C.
The documentation is available here:
As pdf or word file.
https://drive.google.com/drive/folders/0B1ObyCB9NWIwb0tWcWF4WXp4dHM?usp=sharing
Looking forward to get some response.
Thank you in advance for your support.
Kind regards
Marcel Bodmer
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E-Mail: Marcel.bo(at)hotmail.com (Marcel.bo(at)hotmail.com)
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pestar
Joined: 11 Apr 2007
Posts: 61
Location: Auckland, New Zealand
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gilles.thesee(at)free.fr
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| Posted: Mon Sep 26, 2016 2:56 pm Post subject: Cooling issues on the ground XS 914UL |
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Le 26/09/2016 à 21:24, pestar a écrit :
| Quote: | | Quote: | --> Europa-List message posted by: "pestar" <peter(at)reivernet.com> (peter(at)reivernet.com)
Marcel
Go to http://contrails.free.fr/engine_aerodyn_radia.php which is in French. Gilles Thesee who did the design work for this for a Rotax 914 lives nearby in Grenoble. The article gives a good indication of what is required to keep an engine cool. I use the same system on my Rotax 914 powered DynAero MCR-4S.
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Hi Peter, Marcel and all,
Was just making up my mind to respond when Peter's message arrived.
Marcel, please feel free to contact me direct, and why not come over to LFHH where our airplane is based ?
We would be pleased to discuss your problem. There are solutions.
Considering the design of your cowling and the (air inlets) holes in it, it is easy to get a notable improvement. Getting the most efficient cooling while reducing cooling drag would unfortunately involve more drastic mods in the cowling.
| Quote: | | Quote: |
DynAero MCR-4S (Do not shoot me  ). |
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The MCR 4S is a four seater with the same engine(s) as the Europa, the same all round performance, climb, cruise speed, etc. and outstanding take off and landing capacities, due to very efficient flaps, and lower empty weight.
And as Peter says, we have no cooling issues be it on the ground or in flight.
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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Roland
Joined: 30 Nov 2009
Posts: 334
Location: EDLE
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| Posted: Tue Sep 27, 2016 1:32 am Post subject: Re: Cooling issues on the ground XS 914UL |
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Hi Marcel,
as you know, I had the very same problem with my Trigear (same engine), however not that extreme (I didn't have to shut down but came close to the CHT-limit on the ground in summer - never when flying). Like you, I didn't build my Europa myself but bought it second hand for the very same reason of lacking knowledge and skills.
If you go to the appropriate thread (a few weeks ago), you can read, what I did on my aircraft modifying the standard XS-cowling without too much effort. However I don't know, if my measures are applicable also to the Monowheel.
I can now also run my engine for extended times on the ground in high temperatures >30°C. Under no conditions do I experience any cooling problems in the air.
For sure I would accept Gilles offer to help you with the cooling issues! Good luck!
Roland
PH-ZTI
XS TG 914
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Roland
Joined: 30 Nov 2009
Posts: 334
Location: EDLE
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| Posted: Tue Sep 27, 2016 1:40 am Post subject: Re: Cooling issues on the ground XS 914UL |
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| Quote: | And as Peter says, we have no cooling issues be it on the ground or in flight
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The prop on the MCR with a very wide chord might also play a role here. It's completely different to the Warp Drive blades.
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gilles.thesee(at)free.fr
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| Posted: Tue Sep 27, 2016 2:41 am Post subject: Cooling issues on the ground XS 914UL |
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Le 27/09/2016 à 11:40, Roland a écrit :
| Quote: |
| Quote: |
The prop on the MCR with a very wide chord might also play a role here. It's completely different to the Warp Drive blades. |
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Hi Roland and all,
Yes it might play a role, but only to a limited extent. Peter's prop is different from our two bladed MT which has an efficient airfoil up to the blade roots.
With a proper radiator duct, you get some cooling even with the engine stopped and the nose into a light breeze.
Rapid overheating on the ground might be an indication that no air is getting into the radiators core.
FWIW
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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h&jeuropa
Joined: 07 Nov 2006
Posts: 654
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| Posted: Sat Oct 01, 2016 7:29 am Post subject: Re: Cooling issues on the ground XS 914UL |
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Hi Marcel,
It looks like the air can go around the coolers. Here is a photo of how we use aluminum tape, rubber and weatherstripping to seal the gaps so the air has to go through the radiators. That might be your first step. It does not require fiberglass work and is easy to do.
It is hard to tell from your photo, but if the builder did not smooth the cowl entrance to the coolers, the air coming in will be disturbed, so that is another item to check.
We also recently added a cowl flap, copied from Erich Trombley, which has reduced cooling drag.
Regards,
Jim & Heather
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HB-YNK
Joined: 30 Sep 2016
Posts: 6
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| Posted: Tue Oct 04, 2016 11:26 am Post subject: Re: Cooling issues on the ground XS 914UL |
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Dear all,
Thank you very much for your help.
I'll start to close all gaps around the radiators and then check out the improvement, before doing some more improvements.
Probably I'll come later back to you, especially to Gilles, Jim & Heather for some detail questions.
Thanks again for the great support!
Wish you all the best.
Greetings from Switzerland
Marcel
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