Originally Posted by
Cat 1
Great Alternate design MK... There are many ways to skin this cat I think, And Bert is correct that you could make one out wood if you needed to.
I really wish it wasn't winter here and I could get out and try this - I have an idea to get it into a plane but the weather might not cooperate. I will soon be ready as soon as I have a nice day. I tested a plane last week but the trek though hip deep snow wore me out.
I do not think this will replace the solenoid setup for accuracy - You can tell by the vague response to curve adjustments that this is more a correction not a setting. I'm thinking if you have a good running glow engine with a reasonably good carb (accurate needles) - this will allow it to run well on gas. It seems to correct the issue of the "thick mid range" very well.
Just a note - My "systems" use the bigger size tube and nipples (ID of nipple is 2.5MM) - This was determined to be minimum size needed in initial "open" hole tests. - But your results may vary......
What I am most curious about, is
-whether fuel draw will hold up in flight in the midrange throttle positions,
-whether location of the air injection valve in the plane will affect its accuracy and settings (does the airvalve need to be in the engine bay to be exposed to the same conditions as the main intake, or can it be in a more protected location behind the firewall)
-Is the valve subject to wear or pollution (does it "hold its calibration")?
To be honest, I won't be able to get around to experimenting with this very soon, but I have at least one plane with an engine where this is very easy to install (my ASP FS91 has a factory made port in the intake header), but that is one of the engines that also still has a carb that I modified by grinding the slanted groove in the throttle barrel. It would need a new unmodified carb to make the tests valid, and I don't have one.