Because the air intake is forward of the main gear, or nose gear, unless you have a pusher . And you're above the dirt not in it.... You'll notice glow plugs last a lot longer as well

I used to have a PT40 that ended up in a tree, It was a trike, but it had an air filter. Mostly because in the taller grass, I'd end up cutting the grass for them (without getting paid by the way, which is still a sore spot) and I'd find grass particles on the filter every now and then after those flights. They were worth every penny, but yeah, no one is really using them anymore.

Now I hear there's a whole new line of mixed gas engines that take regular unleaded at less than $4 a gallon with a drop or two of two cycle oil mixed in to keep everything nice and lubed. On the downside, they're VERY expensive as far as I've seen, but the flight times are outstanding. I've heard you can expect as long as an hour of flight time on a single pint sized tank, as compared to the guys at my club that get about 15 minutes of airtime before they run out of the pint of very expensive $25/gallon nitro fuel in the old style alcohol burners. I think if I spent 2K on a true gas engine for my plane I'd probably rig something up just to be safe. At that price an engine is an investment.

I love the smell, and sound of good gas engine, but you can buy a whole bunch of motors and speed controllers for that price.

[QUOTE=Psychron;12369080guys at my club that get about 15 minutes of airtime before they run out of the pint of very expensive $25/gallon nitro fuel in the old style alcohol burners. I think if I spent 2K on a true gas engine for my plane I'd probably rig something up just to be safe. At that price an engine is an investment.

I love the smell, and sound of good gas engine, but you can buy a whole bunch of motors and speed controllers for that price.[/QUOTE]




You're posting about money again. It's funny how you forget to include the cost of your batteries.

As I said to you before, if it's about the money, you need a different hobby, because this one can be very expensive.

I also mentioned to you, that it's all fun, gas, glow and electric. You seem to feel that electric is superior, and frequent wet fuel forums to preach your gospel.

You're out of line and off topic.. I "mention" electric at the bottom of the thread after touting the benefits of gas and nitro. I mention that the .40 sized gas engine replacements are very expensive in comparison to the nitro engines. Talking about money is how people decide what they can afford. Not everyone has a basement vault filled with gold bars like you.. My batteries are about $180 a dozen, one time, and then replacement costs a few years down the line when they don't provide the same flight times.

Would I like a gas plane? Yes. Is that why I'm in this thread? Yes. Is there a cost benefit comparison to be made between one propulsion method and another? Yes.

Now why don't you take a time out, cool off, and come back when you're ready to play nice with the rest of us, cause I have no idea what your problem with me is, and I sure don't care to be your whipping post.

Now to the thread question to begin with, If your engine didn't come with an air filter, I'd want to find one for your engine stat.. Like I said, those engines are in investment and on a windy dusty day, you're going to get stuff in your engine you didn't want. Even Ambient dust causes problems.

My Pegasus 3.20, Saito 3.00, OS 3.00 and Magnum 1.60 twins have no air filters. Like any pilot that I know, I see no need.

Some of my TD .049s and Norvels and all the Baby Bees have screens.

That's right. My Cox .049 was a baby bee.. or at least the name rang a bell. and from what I remember that little guy had a screen also. Man, It has been a while.My OS Max .40 had no screen or filter, but then again with the intake right behind the prop, top dead center just front of the cylinder, I'm not sure how I'd rig anything up for that.