Justin(at)systemwise.co.u
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 Posted: Mon Jan 23, 2006 4:59 am Post subject: Scoops and 912S Temperatures |
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Hello Everyone,
Apart from a few pictures I have not been a contributor to the Forum but
Ted has responded a few times, although we have both been avid readers.<
Two subjects have cropped up this week which I feel, at last, I can make
a useful contribution.
The first is the Rotax 912S intake scoop to supply air to the composite
cylinder barrel shroud which we have on our Rotax 912S. The factory
supplied offering does the job but I was determined that our Classic
would have a friendly face as well as be as aerodynamic as possible. I
have posted a picture of our scoop which is situated under the spinner
and is a great success. It did require some nifty moulding to make a
piece that connects it with the Rotax shroud but by the time you get to
this stage there is nothing you can't make out of composite. Right?
Picture of Scoop posted to the picture section.
The second is the carb icing thread. The whole subject of engine
temperatures and the control of them was to the fore during our G-ZTED's
first 25 hours.
On temperatures I took advice from Marcus the CFI of our local
Microlight school who is running Rotax 912S engines in the faster
Microlights. He swears by the Skydrive coolant carb heater mod. They
also put a neoprene shroud over their coolant radiators during the
summer to reduce the cooling effect. They adjust the shrouds position
dependent on outside temp on the ground. Our Rotax 912S also has a
Skydrive carb heater so I was interested to hear his take on the
subject. His rule of thumb was to cruise at 90-100 degrees CHT and
100-110 degrees Oil Temp.
Initially we weren't getting anything like that, it's colder in
Scotland. The CHTs were 80-85 degrees. Marcus shook his head and told me
that Carb Icing is quite likely below 85 degrees CHT but with the
coolant carb heater it will stay clear above 85 degees CHT. We now have
it licked. Remembering we have the Classic cowling with big radiator
intakes we blank off the radiator with a Velcro blind depending on
outside temperature and control the temps in the climb by opening our
cowl flaps (photo supplied). We have operated in summer temps of 35
degrees and -7 degrees at the coldest. We still watch it like a hawk but
feel much more in control of it now. At the coldest we blanked of most
of the starboard radiator but this prove to be a mistake as it stopped a
good air flow through the starboard side of the engine compartment and
the coolant overflow bottle distorted with the heat. We are now blanking
it off on both sides equally. We would be most interested if people have
other ideas on 912S engine temperatures.
Justin Kennedy & Ted Gladstone
G-ZTED Europa Classic Rotax 912S Airmaster CP Prop Kit No:15 First
Flight May 25th 2005
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