Low climb rate-RPM indicator in red

Hello Ray

It is doubtful you are having issues with the overload clutch with an engine that has only 20 hours. Most likely you are seeing an indication error on your instrument. With that said, the Yellow arc, and the Redline doesn't provide enough information regarding what your actual RPMs are. Max RPM for 5 min is 5800 RPM (take-off RPM) and cruise is normally set to 5300 - 5500 RPM.

Thank you, this point is well taken.

Actually, the prime issue is R.O.C. not satisfactory. That means, the propeller isn't able to convert engine power to forward thrust. Since the clutch connects the engine to the propeller, it is possible that the clutch is slipping. Hence we suspect something could be wrong with the propeller or with the clutch. Another propeller was also tried out, but no change. Thus the focus is on the clutch, though not quite sure. 

This may also address the RPM issue. Propeller load is not being correctly felt by the engine due to slipping clutch and hence engine is free to rotate with low load, thus allowing RPM to go up. Does it sound logical?  kindly comment. If anyone had experience of working with a defective / worn out clutch, it would be great to share. Thanks.

Ray

What type of prop setup is on this Tecnam?

I have a couple of Tecnams at my field. Is it a constant speed / variable prop or ground adjustable?

hi Roger,

Thanks for your response.

It's a  Hoffman fixed pitch wooden prop, model no. HO 17G HMA 174 177C. Would you need any other information, please let me know.

Looking for your expert opinion..

Regards,

Ray

We could use a few more numbers to make a good decision. When you are in level flight what is your maximum rpm? If it's over 6K don't go there. Let us know if it's under 5500 rpm in level flight at WOT. If it's a fixed pitch and the pitch is either way to corse or too flat then you may want to install a ground adjustable prop. I've put several on Tecnam's and all had a far better performance. All my guys had too course a pitch and they went to a Sensenich 68" 3 blade ground adjustable prop with really good improved performance. Tecnam approved this prop in about two days.