|
|
Bill,
I flew in a Tiger last year. The Tiger had a carb air temp (CAT) gauge. When I pulled the carb heat, the CAT increased by about 10°F. In my Lancair with an O-320-D1F, and the heat muff stuffed with stainless steel Brillo pads, the CAT only increases by about 8°F. I know that this is not enough but I would be happy with a 15°F increase.
The new CAT increase requirements must be much more stringent than in 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 induction
heat system.
////
Part 23 AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER
CATEGORY AIRPLANES
Sec. 23.1093
Induction system icing protection.
(a) Reciprocating engines. Each reciprocating engine air induction 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 at a
temperature of 30° F.—
(1) Each airplane with sea level engines using conventional venturi
carburetors has a preheater that can provide a heat rise of 90° F. with
the engines at 75 percent of maximum continuous power;
.
.
.
////
These specifications are the result of extensive testing in 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 prove
that you can survive the full range of possible encounters. My 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
|
|