Don’t laugh but me and a friend use to use pieces of nylon pantyhose and a little rubber band to hold it over the intake to help keep trash out. I don’t remember where we got the idea from, but we flew off a gravel road and it seems to be a good idea for a improvised air filter. Any you guys heard of use women’s nylon hoses for this? Thanks………. Tony

It may have worked for you, but to me it sounds like a dissaster waiting to happen - rubber bands and oil do not go together well.
What if the band came loose right at takeoff, full throttle, the filtermesh sucked in to either lodge in the spray bar (if you are fortunate) and immediately effectively cut the engine out. If you are really unlucky, it could go all the way in the chamber. Either way it could ruin your day.

I've done the same thing, but instead of a rubber band, used a very small nylon zip tie. So far, so good.

I've used fine brass screen.... I've also use the Bru - line or whatever they are called from Tower.

Good point but we replaced the bands and panty hose after every day of use. The inviroment was pretty dirty that we were flying in. At the end of the flying day are planes would be coverd in dust, but thats the only place we had at the time and we were learing, so we had cheap arf trainers. I admit now if i thought i needed a filter on my engine i would just buy a manufactured brand. We just got some used panty hose and had a bunch of little rubberbands so what the heck.

Pantyhose is quite often used in CL stunt but more as an aid to fine tuning although it works well as a filter. The BrueLine filters are quite good but in CL stunt the fine filter is known to give about the same affect as reducing the venturi size about .020" for better fuel draw. The coarse filter has the affect of reducing it by around .010". By using pantyhose in up to maybe 10 layers they then have a very fine control over the effective venturi size.

So for RC where the carbs are far too large, you can keep the dirt out and get better fuel draw as well . An "O" ring should be just the thing to hold them on.

I agree with Downunder, I have used pantyhose and an O ring and have had no trouble. I used it on a ThunderTiger Pro 61 and its works perfect. When the hose gets dirty and oily, just cut you a new square of it and replace and you're good to go. I do wait until my pantyhose starts looking ratty and torn and not fitting me very good before I use them on my engines though (sorry, I just couldnt help it .LOL No, I dont swing that way, heheheh!!!
John