RE: 3W 100 - acts up after 15 minutes
Just got back from the field. First and second flight each 15 minutes each and no problems. But on the third flight, at 14 minutes, the engine acted up again. Sounds like mis-firing or perhaps only running on one cylinder. I always set up and land within 30 seconds or so because the engine sounds so bad. I was 92 degrees today.
I have some baffles on top and bottom of the fins, so the incoming air must go through the cylinder fins. there is a fairly large area between the top of the cylinder and the cowl where the air could pass through and bypass the engine. In other words, the air could pass by the top of the spark plugs and not be forced through the top fins. I will improve this to see what effect it has. The plane is a 35% Carden Cap, about 27 pounds rtf. I fly a mixture of low and high speeds, so it is possible to fly almost 30 minutes with a 32 ounce tank.