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High CHTs - Dual Radiator in Series ?

  • fly2sky
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2 months 2 days ago - 2 months 2 days ago #22662 by fly2sky
High CHTs - Dual Radiator in Series ? was created by fly2sky
Dear,

On my pusher config aircraft I'm having problem with high CHT temps that keep on rising during flight until 140 deg C. I'm using waterless NPG Plus coolant.
What I'm doing is to install two Rotax 12-fins radiators in series side by side so that coolant gets more time passing through the coolant radiator and gets cooled on 2-stages. Is it safe to be done or would I face any unintended consequences? Did anyone do it before?
Last edit: 2 months 2 days ago by fly2sky.

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2 months 2 days ago #22667 by Roger Lee
Replied by Roger Lee on topic High CHTs - Dual Radiator in Series ?
"I'm using waterless NPG Plus coolant."

You shouldn't be using this plus it carries a 20-30F heat penalty. Dump it and use a Dex Cool 50/50 mix.
Water absorbs and releases heat far better than waterless. Waterless isn't recommended anymore. You'll be happy you did.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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2 weeks 4 hours ago - 1 week 6 days ago #23102 by xìng wang*
Replied by xìng wang* on topic High CHTs - Dual Radiator in Series ?
CHT Depends on location of radiator and fresh air throw on these radiator can be cool it.
The duct that provides fresh cool air can be redesign for keeping the CHT on lower side.
The value of airflow mentioned in operator manual book.
Last edit: 1 week 6 days ago by xìng wang*.

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