Normal Operating Temps ?
But your temperature readings tend to be about what I get on some of my engines. So you are in the ballpark, so to speak.
Using a Infrared thermometer is tricky as the temperatures can vary a lot depending on the shininess, color and reflectivity of the surface. Using temperature probes can be a problem as the sensor is on the surface and may not be getting a really good contact to it either.
Some gas engines will read higher than others, it depends on the air flow through the fins and over the engine, as well as how many cooling fins or surface area the engine has to help dissipate the heat. Using a really good high grade oil can make a noticeable difference too, as the oil reduces friction which reduces the heat too.
Hey Len have a look at post 23 by PE. on this thread http://www.rcuniverse.com/forum/m_11...m.htm#11071695
Thanks for the information. It seems like getting the max temp for my sport setup below 300F, maybe worthy of trying a few mods. At the very least, it is obvious to me that I have to do something with the Extra I have on the bench that I am building for 3D.<o></o>
I am using the standard mufflers that come with the DLE 111s. On the sport Extra, I have two large openings in the bottom of the fuselage’s canister space (behind the mufflers and not used) that provide warm air exit paths. I think I will add an exterior air dam in front of and below these two openings to create a bit of vacuum. This could improve the warm air exit. I may also add a baffle inside the canister area to deflect the warm air down and out of the canister area versus counting on the air trapped in the rear portion of the canister area to divert the warm air out. Then, I'll take some new measurements. I believe in taking one step at a time and then retest, etc.. <o></o>
I am a little hesitant to baffle the air from the front of the cowl opening to the engine. If I did that, I am not sure where the cooling air for the mufflers would come from. Maybe, I’ll try a baffle from the top of the cowl’s air inlet to the top of the cylinder’s cooling fins. This would at least preclude air from going over the top of the engine w/o cooling it. If I do this, after some testing, I may look at something to deflect the air coming off the back of the cylinders down toward my openings.<o></o>
This may take a few weeks as the outdoor flying is winding down here and indoor flying is ramping up. I’ll keep track of the mods and related test results to post when I get this complete. Thanks for taking time to respond to my question.