Jack,Richard,,
Jack,
Why do you think > 70mph air is entering the roof vent, what is causing the low pressure in the cabin?
Have you tried this with the NACA duct servo open (switch NOT on recirc) that should bring air into the cabin and exhausting through the roof vent or cracked toll windows...if not enough air volume with just the NACA duct open what about with blower on high (all that air coming just from the NACA duct has to go somewhere...where does the majority of it go if not out the roof vent unless the toll windows cracked? Are you and Dennis sure your NACA servo wiring isn't reversed (MINE WAS, I was in recirc when I thought I was bringing outside air in).
Richard,
Looking at some of your earlier pics in this thread see where the fuel tank vent lines run up to the upper filler assembly that bolts to the mono...what Jack and I are saying is that the sponsoon area around the mounted tank is all open and that this open space continues around the vent lines and the main fill tubing vertically (so the sponsoon area is in fact a big L....down from AROUND the fill pipe and then horozontally where the tanks mount). Question is wheather the vertical void is in fact not sealed from the cabin. As Jack explains: there are lightning holes in cabin side mono panels. I'm OK with this as long as there is a positive pressure in the cabin during forward motion or with the blower on high with the NACA ducting open to outside as I wrote above because with a positive pressure (if it does exist) it will push some air through the sponsoons and out a rear sponsoon vent if installed therby purging the void.
Thoughts??
Steve
Jack,
Why do you think > 70mph air is entering the roof vent, what is causing the low pressure in the cabin?
Have you tried this with the NACA duct servo open (switch NOT on recirc) that should bring air into the cabin and exhausting through the roof vent or cracked toll windows...if not enough air volume with just the NACA duct open what about with blower on high (all that air coming just from the NACA duct has to go somewhere...where does the majority of it go if not out the roof vent unless the toll windows cracked? Are you and Dennis sure your NACA servo wiring isn't reversed (MINE WAS, I was in recirc when I thought I was bringing outside air in).
Richard,
Looking at some of your earlier pics in this thread see where the fuel tank vent lines run up to the upper filler assembly that bolts to the mono...what Jack and I are saying is that the sponsoon area around the mounted tank is all open and that this open space continues around the vent lines and the main fill tubing vertically (so the sponsoon area is in fact a big L....down from AROUND the fill pipe and then horozontally where the tanks mount). Question is wheather the vertical void is in fact not sealed from the cabin. As Jack explains: there are lightning holes in cabin side mono panels. I'm OK with this as long as there is a positive pressure in the cabin during forward motion or with the blower on high with the NACA ducting open to outside as I wrote above because with a positive pressure (if it does exist) it will push some air through the sponsoons and out a rear sponsoon vent if installed therby purging the void.
Thoughts??
Steve