Hi Kingsley
I have had temperature problems just during the first flight with my
Classic 912S,
although temperatures in Switzerland are normally much lower as in your
country.
The engine stopped in about 120m AGL because vapour lock. You could read
the full
story in the Europa Flyer December 2016. There was no time for checking the
temperatures. But I think the oil temperature was about 120C after take
off,
because the cooling effect during taxi and run up was not enough.
This has been confirmed by additional tests.
After some modification to the cowling the problem was fixed.
See this link: http://www.theeuropaclub.org/building/cowl-and-cooling
"Cooling 101 for Europa"
This modification has been done to the cowling:
- Enlarges the inlets for cylinders and radiators
- Enlarge the duct ramp about 5cm each sides
- Add a temperature sensor (LM335) on top inside the cowling for monitoring
the temperature around the fuel system and contact to the MGL EFIS aux.
input.
That's all. Everything with temperatures seems to be OK now.
Kind regards from fogy Switzerland.
Ruedi Vogel, HB-YJF
Am 24.12.2017 um 12:40 schrieb Kingsley Hurst:
> I have a plain vanilla 80HP Mono Classic. Plumbing of the coolant
> radiators are as per the book and the oil cooler is mounted underneath
> the spinner as recommended by Europa.
> Cylinder head and Oil temps were totally unsatisfactory until I made
> two ugly fixed cowl flaps (temporary ones) that allow a better air
> exit path. Today, with a ground temp of 38C (@400 ASL) I climbed from
> ground level to 8,500 ft at 80kts IAS on full throttle and 5500 RPM.
> Max CHT and Oil Temps reached were 102C and 116C respectively. In
> cruise at 8500 ft on full throttle (22" MAP) and 5000 RPM with OAT of
> 17C, the temps dropped to 70C and 84C respectively which is a bit cool
> but easily fixed. I'm happy with the cooling at this moment but am
> unsure how it will be in the hot conditions of North Western
> Queensland where the ground temp is often around 42C to 45C but I digress.
> After shutting down today, the OAT was 39C. CHT was 91C and Oil temp
> 88C. After opening the hatches on top of the cowl, I felt the temps
> of the two coolant radiators in the front of the cowl and one was
> noticeably hotter than the other. This is understandable as both
> radiators are in series.
> Ignoring the complexity of the required plumbing, I then contemplated
> what might happen if the coolant radiators were connected in parallel.
> I reasoned that if in parallel :-
>
> * The temperature differential (deltaT?) between the coolant temp
> and the OAT would be maximum on both radiators giving more
> efficient cooling as opposed to different differentials in the
> series set-up .
> * The flow rate through each radiator would be halved so coupled to
> the higher deltaT, I assume better cooling as a result.
>
> My question,
> Does anybody have first hand experience with such a set-up and if so,
> do you have any documented evidence of improved cooling as a result?
> Cheers and all the best for the Festive Season to all.
> Kingsley in Oz.
--
Ruedi Vogel
Wiesenweg 6
CH-3380 Wangen a.A.
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