Actually, Dan, you are mistaken about flying with the cabin heat
turned off. When you turn the cabin heat off, the warm air from the
hose exits the cabin heat box through a different opening. Keeping a
constant airflow though the cabin heat muff is extremely important.
In addition to softening the manifold pipe, it may warp out of
straight, causing many problems.
Syd
On Jul 21, 2009, at 1:11 PM, Dan Bass wrote:
Ed wrote:
I was told, do not remove the hose from the baffle to the muff. The
airflow through the muff must continue or the manifold pipe inside
the muff will have no airflow and will soften and maybe melt through.
My heat box leaks, so in the summer I remove the tubing from the
heat exchanger to the heat box. I was thinking about using a plug
on the hole in the baffling that supplies the ram air to the cabin
heat. This would stop the heat coming into the cabin and also aid
in cooling the engine. I haven't done that yet because I have heard
the same thing that Ed stated above. But when you think about it,
it is no different than flying with the cabin heat turned off. That
part of the exhaust pipe is not receiving any airflow at that time.
Just my thoughts.
Have anyone ever seen the exhaust pipe inside a heat baffle melt on
an airplane?
Dan B
N93805
From: Ed Burkhead <[email protected]>
Subject: RE: [ercoupe-tech] Re: Carb heat/Cabin Heat
To: [email protected], "ety" <[email protected]>
Date: Tuesday, July 21, 2009, 12:06 PM
Also, be aware that a lot of owners remove the cabin heat scat hose
from the muff to the firewall during the summer. This reduces the
blast of hot air on the flapper box and firewall. Since some
flapper boxes leak, this keeps the cabin cooler in the summer.
I was told, do not remove the hose from the baffle to the muff. The
airflow through the muff must continue or the manifold pipe inside
the muff will have no airflow and will soften and maybe melt through.
Don’t forget to reinstall it in the fall.
I’m not a mechanic of any kind. Consult on this with your mechanic!
Ed
