RCU Forums - View Single Post - Help My OS 65 Keeps Overheating

12-03-2015 | 01:05 PM

#25

Champstarr

Joined: Aug 2014

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Quote:

Originally Posted by Instructor

First off I would change the size of the tubing. If you are using 1/8" Id, then I would go to 5/32" Id. Most .60 to .61 glow engines run 11X7 props. A 13X6 seams a little large for a .65. Do you hold the nose up when you adjust the high speed needle? I do this every time I fly glow powered models. Lean it until it just starts to clear it's self out then stop. It might sound like it's not enough power when it is on level ground, but it will lean out when you get to altitude.....

Larry/Instructor

Hi Larry,

The recommended prop sizes for this engine are 12x6, 13x6-7 and 14x6. Wouldn't a smaller prop cause the engine to operate a higher than acceptable RPM and overheat? I typically do hold the nose up at an angle when tuning. So you suggest running a wider tubing for this engine?

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