enginehistory.org

The October, 2010 AAIB Bulletin has an interesting account of this engine, and its failure. Unfortunately, the plane crashed and the pilot died.
Some of the issues were lack of running, possible use ...

I recently acquired some u/s parts from a P & W R-985.

The piston pin seems very heavy compared to the relatively light weight link rod.

I would appreciate any thoughts on why the piston pin ...

Pratt & Whitney's "The Aircraft Engine and Its Operation" has a discussion on this. As I recall, they advise against using reduced power for take-offs.

Has anyone got a copy of this and if so, what do you think of it?

Also-congratulations to Mr. White on publishing his new book. I am looking forward to it!!

Will Torque Meter have an article describing the Archives and how to submit contributions? Thank you. Steve

Thank you for your comments. Similar thoughts occurred to me. I also was surprised that the people doing the differential compression checks did not seem very familiar with the specific requirements ...

The NTSB recently posted AAR-04-03 on its web site concerning the failure of this type engine. I found the maintenance aspects interesting, and thought others might like to read it. www.ntsb.gov

Trying to understand harmonic vibration with respect to rotating shafts, esp. different "orders". I would appreciate help with this or a reference I can read. Thank you.

I recently started reading about the Dart turboprop. The author discusses layshafts with respect to the prop shaft gear reduction. What is a layshaft?
Is it like a quill shaft? Thank you.

Also, ...

Thank you for this information. It is a little difficult for me to visualize how
this is all happening, but I will use your information and do some sketches.

I have always wondered why the number of lobes on a radial engine cam
ring determines its direction of rotation with respect to crankshaft rotation.

There is a complicated (for me) explanation in ...