Another comment... no air filter needed???
 

I am seeing many pics of planes, and none of them have an air filter attached on the carb?

RE: Another comment... no air filter needed???
 

There's not much dirt up there... Unless you live in LA :D

RE: Another comment... no air filter needed???
 

Hey, Minn.. how can you trust air you can't see... Hmmm? :D

RE: Another comment... no air filter needed???
 

The only time you are at significant risk of sucking a lot of dirt into the engine is on the ground. If you fly from asphault or concrete, there is no need for a filter. Most grass runways are also typically clean enough that a filter isn't needed. I have heard of some that use filters becasue the site conditions warrant such, but in general, the vast majority of sites don't require a filter. One might think "why not just use a filter anyway." I have used filters before and they will rob power. I dropped 150 RPM when I used a filter on a YS140. 150RPM may not sound like a lot, but it equated to 0.15HP on that setup, or a 5% drop in power, just from the filter.

RE: Another comment... no air filter needed???
 

I use filters all the time because we fly from dirt runways. If they were grass or paved I wouldn't bother with a filter.

RE: Another comment... no air filter needed???
 

I am required to use a air filter at all times because I use a airplane engine to power my truck and I like a drivin' in the dirt. [>:]:D But with my airplanes, I don't bother because where I fly, we take off from a 400' asphalt runway and there is no dust/dirt often (but there is fine dirt off to the sides of the runway)

http://img.photobucket.com/albums/v1...haseIII012.jpg

RE: Another comment... no air filter needed???
 

dick,
it's the air that you CAN see that you shouldn't trust :)