Greetings Lynn,

 

I understand the first part of your post eg. damaged housing causing drag, but I am scratching my head about how an alternate air door, in the intake, would address that problem. It is my understanding that the alternate air door is placed to allow air breathing in the case of induction system blockage upstream of the door itself, i.e.. induction icing bird etc impaction which strangulates the system defeating the normal flow of air to the chambers.

 

This alternate air, if used, is unfiltered.

 

So my question is how does this air coming into the system, through the alternate air flapper, upstream of the air filter, eliminate the problem of blowby in the case of the type of damage that you mentioned.

 

My system allows me to shut off the injectors and ignition to each trochoid (in my typically anal approach, I can shut off each injector and coil separately). I can use the EGTs to tell me what trochoid is problematic and electrically and fuelishly isolate it. this should reduce the drag.

 

Happy 4th of July weekend to all

 

Rich

 

In a message dated 7/4/2013 9:42:41 A.M. Central Daylight Time, Lehanover@aol.com writes:

While a piston engine can survive some dreadful FOD damage, a rotary cannot. Even a tiny stone can turn your engine into ballast.

 

Many think that one rotor housing can get you home. Not the case. Extend the glide? Maybe, depending on the damage. A damaged housing may connect the firing chamber to the next mixture filled chamber and fight the running housing with lots of drag and heat. An alternate air door in the intake would eliminate

the problem. It is common on production aircraft and part of a Life Extension program.

 

Lynn E. Hanover

 

In a message dated 7/4/2013 10:06:31 A.M. Eastern Daylight Time, steveizett@me.com writes:

Thanks Rich

Steve

On 04/07/2013, at 9:58 PM, ARGOLDMAN@aol.com wrote:

The necessity of a filter may depend on where you fly from and where  you expect to fly. Occasionally there are swarms of insects that we fly through (at least in my part of the country) which will be ingested. those little exoskeletons are quite abrasive.

 

Mooney in their old "Super 21s"  had a flap which allowed one to select ram air at cruise.

 

In a carb, when operating on carb heat, the air is unfiltered.

 

Rich

 

In a message dated 7/4/2013 7:48:58 A.M. Central Daylight Time, rwstracy@gmail.com writes:

> 2. I take it that filtering is essential. How does water effect filter material? What filter material is best.

On a car, a must.  On an airplane, just be careful where you put inlet ( keep it high) and don't taxi behind someone on a dry dusty taxiway.   Never had an air filter.

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