Re: Your Opinion
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“Carb” Ice on any engine using petroleum spirit with a Venturi metering device is a silent killer which doesn’t get the attention it deserves.
Most folk don't ever test to see if their “carb heat” system meets the requirements of FAR 23.1093 (90f rise in intake aIr temp 65% at OAT of 30f)
If the engine quits because of carb ice, you’re going down, - and what’s more, the evidence of the cause of the failure will have melted away by the time any accident investigator gets there.
I’ve lost count of the numbers of people that have crashed due to carb ice/inadequate heat/unused carb heat, and believe that it’s the most dangerous thing on a Continental 0-200/0-240 which are otherwise a great engines.
I have a wrecked LongEz in my shop now (Continental 0-240) which was caused by a poor carb heat system,
A friend wrecked his LongEz, and was badly injured, due to not fully using carb heat;
Another friend had icing induced engine failure , and found a big tree in the field fate selected for him, which killed him; https://www.irishtimes.com/news/ireland/irish-news/aircraft-crashed-after-engine-cut-out-due-to-ice-inquest-hears-1.3407962
If you can't afford fuel injection, get carb heat muffs on headers both sides and make sure you get the heat rises called for in the FARs - it’s one of those regs that's “written in blood”. And don't be shy about using heat all the way down to touchdown, and warming the engine every 500ft - those pipes don't have much thermal mass and quickly lose the ability to heat the air adequately.
Another thing I’ve noticed about fixed wing pilots is that many apply carb heat as if they were doing harm to the engine, and thus dont seem to like leaving it on.
While it’s true that max power is with cold air, you only need that on a climb out.
So I’m puzzled when a pilot selects carb heat on the downwind, then turns it off on finals, just when going through the most vulnerable phase of the approach.
If you believe that carb heat harms the engine in some way, keep in mind that all Robinson R22 helicopters (Lycoming 0-320/360) run with carb heat on all the time (unless you live in the desert of course...)
Fly safe, and land with heat :^)