even at 40 F it is COLD in my cruisair.
Left side muff provides heat to carb or Rear Seat feet.
There is quite a bit that can be done to stop the ingress of cold air at the wing roots
( this is where most of the drafts come from).
Seal the wing root speed fairings ( if you have them) with the 3M goop. LL knows the product number.
Then it is a matter of improving the insulation and perhaps adding some taped in air barriers ( tyvek ?)
There is an "air dam" at the front and rear of the front seat made of something similar to wing skin ( 3/32 ply) with
big gaps. All of these can be taped closed. I had some "duct tape" with moustaches on it.. which dressed up the plane considerably :lol:
There are big gaps at the covers over the rudder cables on the sides of the cabins.. perfect for directing dropped keys into the wing roots. I taped these at the top.. but around the cables good luck.
The fiberglass used at the factory is now a health hazard IMHO.. it jams in control pulleys, it get airborne and you breathe it, and worst, it absorbs 5606 the spills or leaks from the master cylinders. and is therefore a big fire hazard.
IMHO... all that crap needs to be abated and something put in it's place.
I just pulled all mine after mice got in it.
I cannot tell one bit of improvement from having the rear cabin heat on.
The tube is 4 feet long anyway, and likely soaked with the same 5606 that is collecting under your rudder pedals.
Since that hot air comes through the firewall right under the pilots feet, why not direct that hot air into the front of the cockpit also ?
Fiberglass is heavy, holds moisture, and is about as nice to breathe as asbestos.. and probably just about as good for you.
It should at least be encapsulated, if there isn't an acceptable fire proof or retardant foam to replace it safely and legally.
Metal plate on the belly can be sealed with silicone strip used for cowls, or maybe that 3m goop.
A small thermo nuclear device couldn't keep up with the heat loss due to the existing air leaks. :lol:
Motorcyclists wear heated vests, socks, and gloves.. all 12v items... and probably a good bet
to keep the core temp up and the digits a better shade of blue.