F19 Exhaust and Heat

[Taylorcrafty]

Gary / Taylorcrafty,

Taylorcrafty, was your thoughts to order the "Turbo Heat Cabin Heat Muff" from the link you supplied above and just replace the left muff? Just order it to length so it is similar to the original one already installed?

I have uploaded two pictures of my current heating / exhaust setup.

Yes, that is what I was thinking. It has good reviews, but I don't know of anyone running one. I saw one in person, and it appeared to be well made.

Your setup looks the same as what my F19 came with.

I switched to the C150 exhaust last year, but the heat wasn't as strong as I was hoping. At - 10F and colder the air coming from the heat muff didn't seem much warmer than ambient. Door spring trick didn't seem to have much effect.

I like Gary's idea of relocating the inlet to the cylinder baffling. Might have to try that.

[Taylorcrafty]

Here's my heat robber setup. .

Gary

Thank you, this is very helpful

[PA1195]

Here's some thought about winter heating from the engine. The faster the airflow through the system the colder the outlet air but the better the rate of defrosting. Taking inlet air from the front of the cowl produces the best flow but can introduce colder air that then need to be heated than taking it from the rear baffles. The tighter the main cowling outlet the greater the internal cowling pressure and better the airflow through the heater. The engine will only heat the headers so much, so introducing interrupters like door springs or edged-winged aluminum baffles can increase the heated surface area. Inline heat muffs like Supercubs work well...they take preheated air off the front pipe and run it again through a second rear muff. Run the engine hard in winter to heat the header pipes. Close off the rear of the cockpit and tail area with drapes and sealing to hold heat around the pilot. Cold air comes from the rear and up around the bungees so seal them off. Insulate the boot cowl to hold in heat and prevent cold surfaces. Use a flexible defroster hose to melt ice on side and front windows. Dry off your clothing before flying, melted snow frosts up the windows.

And...always have a fresh carbon monoxide detector in the cockpit and use it.

Gary

[Fjquast]

Thanks for the pictures and feedback guys and I'm going to look more into the heat robber setup.

I was chatting at the local airport this morning and one individual mentioned that instead of door springs that they ran copper wire like a coil around the exhaust in a 170 back in the day. It conducts and expels heat well. If you didn't have thick copper wire you could twist two strands of 12 gauge together like you wood safety wire and wrap that around the exhaust.

Also, I have a EGT gauge in the plane and I was thinking you could remove it from the exhaust and put it on the Carb Heat Box exhaust and if you were running the heat off the "Y" you could see how much heat was still flowing through that part of the system. Just a side thought as I was reading these responses and looking at the pictures.

Again, great comments and feedback.

[PA1195]

The F-19 was certified under CAR Part 3. Below are the heat rise requirements for the carb heat system. Earlier Taylorcrafts certified under CAR Part 4 have no specified heat rise requirements that I can find so far.

§ 3.606 Induction system de-icing and antiicing provisions. The engine air induction system shall incorporate means for the prevention and elimination of ice accumulations in accordance with the provisions in this section. It shall be demonstrated that compliance with the provisions outlined in the following paragraphs can be accomplished when the airplane is operating in air at a temperature of 30° F, when the air is free of visible moisture.

(a) Airplanes equipped with sea level engines employing conventional venturi carburetors shall be provided with a preheater capable of providing a heat rise of 90° F. when the engine is operating at 75 percent of its maximum continuous power.

A simple temporary remote temp probe in the carb heat system should confirm that temp rise is available.

Gary

[Taylorcrafty]

Gary,

Do you have a picture of how you did the scat tube in the cockpit? I am trying to I vision how to make it not get in the way of the passenger.

Thanks
Taylor

[PA1195]

From the cockpit side metal collar the air tube goes down to the right to avoid the elevator column, gets tie wrapped near the right passengers foot side to frame tubing to keep it aside, then rises up next to the passenger's right leg next to the right front of the instrument panel then as far as the pilot's left window. It takes several feet of SCAT air tubing.

Gary

[Fjquast]

Thanks for all the information, pictures and help. I will be reviewing the heat robber option / defrost with mechanic.