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From: "Lorn H. Olsen" <lorn@dynacomm.ws>
Subject: Re: Induction (not just carb) heat requirements.

Bill,

I flew in a Tiger last year. The Tiger had a carb air temp (CAT) =20
gauge. When I pulled the carb heat, the CAT increased by about 10=B0F. =20=

In my Lancair with an O-320-D1F, and the heat muff stuffed with =20
stainless steel Brillo pads, the CAT only increases by about 8=B0F. I =20=

know that this is not enough but I would be happy with a 15=B0F =
increase.

The new CAT increase requirements must be much more stringent than in =20=

the past.

Lorn


> From: BILL HANNAHAN <wfhannahan@yahoo.com>
> Date: June 24, 2005 11:32:15 AM GMT-04:00
>
> Here are the minimum performance specifications for a certified =20
> induction
> heat system.
>
> ////
>
> Part 23 AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND =20
> COMMUTER
> CATEGORY AIRPLANES
>
> Sec. 23.1093
>
> Induction system icing protection.
>
> (a) Reciprocating engines. Each reciprocating engine air induction =20
> system
> must have means to prevent and eliminate icing. Unless this is done by
> other means, it must be shown that, in air free of visible moisture =20=

> at a
> temperature of 30=B0 F.=97
>
> (1) Each airplane with sea level engines using conventional venturi
> carburetors has a preheater that can provide a heat rise of 90=B0 F. =20=

> with
> the engines at 75 percent of maximum continuous power;
> .
> .
> .
> ////
>
> These specifications are the result of extensive testing in =20
> response to
> accidents. There is a large envelope of possible induction icing
> conditions. A 50 degree temperature rise may be sufficient for 95% of
> induction icing encounters, but surviving a few encounters does not =20=

> prove
> that you can survive the full range of possible encounters. My =20
> guess is
> that many homebuilts are woefully inadequate in this department.
>
>
> BILL HANNAHAN
> WFHANNAHAN@YAHOO.COM
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan