Originally Posted by
Champstarr
Aloha RCU Flyers,
I have a persistent overheating problem with an OS 65 on my 61 size Escapade. It runs fine for a few minutes and sometimes even a few flights then the engine really loses power. After landing I noticed the engine was very hot to the touch and I got a reading of 230 degrees F on the temp gun (after throttling back and idling for half a minute or so). I have tried running the mixture as rich as I possibly can and still fly the aircraft but I have the same problem. I do have a cowl on it but I cut off the top to fit the motor and let it breathe. I have attached some pictures of the cowl to get some feedback. I run Cool Power 15 % Nitro fuel. I am out of ideas at this point and need help.
More is needed about your tuning. Are you a pinch test tuner? Are you a tach tuner? Do you tune by ear?
When you say as rich as possible what is the data (reasons).
How old is your fuel tubing? How do you store your fuel? What Prop are you using? What glow plug? Besides Aloha, where are you (weather conditions, yes one might guess)?
The simplest reason for leaning at a while into a flight can be a hole in the tubing, brass or line, inside the tank that becomes exposed as the fuel is depleted.
Try tuning with 1/2 tank, then fill it.
These are a few quick thoughts.