Air Vent by Pilot's Knee is loose and has Poor airflow

[Speed Merchant]

The air vent by the pilot knee on my 201 is not secured to anything but the interior piece it is mounted too. It hangs out from the side of the fuselage and hits my leg and us kind of loose . It also has lousy airflow. Does the vent take a special hose or it a just a piece of scat hose cut to length? How should it of been secured at the factory? July in Florida is not a good time for lousy ventilation. Suggestion are appreciated.

[Guest]

The air vent should be secured to the air shop on the side of the fuselage, trapping the upholstery panel in between.  Often the the screw holes in the scoop become stripped and will hold nothing.  
Run the screws through and add Tinnerman flat spring nuts on the outside by reaching into the scoop.

Clarence

[Speed Merchant]

Thanks very much! The hose is a cut piece of scat tubing? I appreciate your help!

 

[EricJ]

There's no hose.   It's an eyeball vent and can be lubed with spray from inside or outside.    Mine was stuck when I got my airplane and it freed up pretty easily.

 

[PT20J]

It sounds like something is wrong with your installation and as described it might cause water to enter the air scoop and drip down on the structure creating a corrosion hazard.

The Wemac vent should have a bead of sealant applied between it an the cabin side of the air scoop. Then the carpeted panel with a clearance hole goes over that. Finally a trim ring goes over the carpet and four PK screws go through the trim ring, carpet, Wemac and into tinnermans on the scoop securing the whole thing together.

Skip

[jaylw314]

I thought the pilot's side air vent was originally an avionics cooler vent that people modded to become a cabin vent?  As such, there's no actual place to mount it, unlike the passenger side air vent

[PT20J]

What I described is the way my 1994 M20J is built. Looking at the IPC, there are apparently versions with a duct to the Wemac in which case perhaps only the carpeted trim panel supports the vent. In this case the lack fo airflow might be due to a disconnected duct. Probably need to take the side panel off to see what you have.

 I think the avionics cooling always came from the right side.

[Warren]

On the K models, the early (1979) models had a direct external vent.  Somewhere before 1985 that external vent was removed and the eyeball vent now attaches to a scat hose that crosses to the co-pilot side and ties into the external vent on that side.  Drag reduction??? Maybe?

I assume that the J made a similar transition.

[Speed Merchant]

On 7/9/2021 at 6:04 PM, M20Doc said:

The air vent should be secured to the air shop on the side of the fuselage, trapping the upholstery panel in between.  Often the the screw holes in the scoop become stripped and will hold nothing.  
Run the screws through and add Tinnerman flat spring nuts on the outside by reaching into the scoop.

Clarence

Thank Clarence I appreciate your suggestion. The vent on my 84 201 appears to be only attached to the interior panel which is kind of wimpy. It is almost like it need a stiffener on the outside of the panel. There must be different vent combinations for different serial number 201 mine is 24-1443. It also has very low flow-close to worthless.

[Speed Merchant]

On 7/9/2021 at 9:10 PM, PT20J said:

It sounds like something is wrong with your installation and as described it might cause water to enter the air scoop and drip down on the structure creating a corrosion hazard.

The Wemac vent should have a bead of sealant applied between it an the cabin side of the air scoop. Then the carpeted panel with a clearance hole goes over that. Finally a trim ring goes over the carpet and four PK screws go through the trim ring, carpet, Wemac and into tinnermans on the scoop securing the whole thing together.

Skip

Skip

There must be different configurations. I am going to have to pull that panel out and see what is up.

Thanks

 

[Speed Merchant]

On 7/9/2021 at 9:52 PM, PT20J said:

What I described is the way my 1994 M20J is built. Looking at the IPC, there are apparently versions with a duct to the Wemac in which case perhaps only the carpeted trim panel supports the vent. In this case the lack fo airflow might be due to a disconnected duct. Probably need to take the side panel off to see what you have.

 I think the avionics cooling always came from the right side.

Skip

Thanks for looking that up. I think you broke the code. The hose must either of come loose or is clogged. July in Florida is a bad time to have a poor vent.

Curt

[Speed Merchant]

8 hours ago, GEE-BEE AEROPRODUCTS said:

Use double wall sceet

no corrosion 

We mfg with 2 inch finished ends 

slip on 

you will never replace 

Thanks for the pictures. Do you guys sell a kit for the interior vent hoses for 84 201s?

[Speed Merchant]

On 7/9/2021 at 9:59 PM, Warren said:

On the K models, the early (1979) models had a direct external vent.  Somewhere before 1985 that external vent was removed and the eyeball vent now attaches to a scat hose that crosses to the co-pilot side and ties into the external vent on that side.  Drag reduction??? Maybe?

I assume that the J made a similar transition.

Yep that is what I've got Warren. Thanks

[carusoam]

+1 on eyeball air vent airflow…

It should be blasting when open, and nothing when closed…

Across the line for all Mooneys… in any location…  ceiling, pilot side, and copilot side….

 

So… if you aren’t getting much flow…. Expect something can be improved.

Ceiling eyeball vents are the most challenging for getting airflow… some plastic parts, and horsehair filters have known to be problematic…

 

PP thoughts only, not a mechanic…

Best regards,

-a-

[Speed Merchant]

On 7/11/2021 at 11:25 PM, carusoam said:

+1 on eyeball air vent airflow…

It should be blasting when open, and nothing when closed…

Across the line for all Mooneys… in any location…  ceiling, pilot side, and copilot side….

 

So… if you aren’t getting much flow…. Expect something can be improved.

Ceiling eyeball vents are the most challenging for getting airflow… some plastic parts, and horsehair filters have known to be problematic…

 

PP thoughts only, not a mechanic…

Best regards,

-a-

It more of a very slight breeze-sort pf apathetic