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December 2021 - Extra

The Air-Blast Engine Project Trilogy

Part 3: Fall Finale

By Paul Harvey

Finally, after so many different names for our project, we chose Diesel Centrale CPM.  Now, we have a catchy and unique name and logo.  So why this name?  It is in honor of the great plant of air-blast engines still existing in Austria.

Diesel Centrale Logo

Diesel Centrale - Austria houses an array of Graz engines that provided electricity for the surrounding industry.  It operated from the early 1900s until the 1950s. It remains intact.

Note the peaceful setting and the magnificent architecture.  It is our intention to capture those qualities here in Coolspring.

Diesel Centrale Austria

Wow!  What a beautiful Autumn.  And so warm and sunny.  I was greeted by these glorious leaves each morning.  Great day for writing.

Autumn Color

So, letís take a peek at what is being done.  Great weather means great progress!  The building site was safely fenced for our Fall Show, and many visitors viewed and enjoyed it.

Building Site

Tom, a master plumber, began the extensive array of piping needed to supply each engine.  Water lines, air lines, electrical conduit, and the list goes on.


Another view of the pipe work.  Since the water discharged from the engines needed gravity return, a gravel bed had to be carefully placed with a drop of ľ inch per foot.  Note the conduits through the foundation for the pipes.  It was all done well.

Piping Installation

We have confirmed the roof tile and wall brick designs and placed deposits to lock in the prices and ensure delivery in March 2022.  Exciting!  The tile is a composite material that is surprisingly lightweight yet very durable.  It is made by Brava Tile.  Our choice is called Terra Cotta and closely resembles that used in Germany.  The bricks are Canton design made by Glen-Gery.  Many styles were examined, and these are a nearly perfect match to photos kindly supplied by Dr. Friedrich Busch.

Roof Tile  Brick Sample

A 1,000-gallon elevated tank, restored by Stanton Dynamics, will provide cooling water for the engines.  The water will then drain into the 1,250-gallon sump tank, made by Punxsy Burial Service, to be pumped into the elevated tank to repeat the cycle.  All pipes to the sump will be through the green riser.   Great, but where does the water come from?  SoÖ

Overhead Tank  Sump Tank

We need a water well!  I contacted Forsyth Drilling in DuBois and a suitable day was chosen.  Wow!  What a rig.  He had to pound in 42 feet of steel casing to get through the gravel and into the water-bearing sandstone.  Finishing at 100 feet, he found an almost unlimited supply of good water.  The submersible pump has now been installed and all is ďwell!Ē  Besides filling the tanks, it is imperative that cold water be supplied to the engine intercoolers for proper operation.  As time goes on, there will be many other uses for this great water on ďThe Hill.Ē

Well Driller  Well Head

So, whatís happening with the engines?  Some progress and some delays.  Letís take a look.  Friedrich sent me this photo of the Graz happily running in his shop in Hof, Germany.  The COVID-19 problem postponed our making a trip to learn its operation, dismantle it, and to move it to CPM.  We hope 2022 will be better.

Graz Engine

The Benz has been extensively restored by Gordon Jones and will have a test run soon.  It will winter in his shop.

Benz Engine

Chris Austin and I have studied the complicated piping on our Augsburg.  It is of the early design where the first stage of the injection air is bled from the power cylinder.  The middle rocker arm has a shiftable roller that can operate the starting air, then bleed off injection air.  This design was soon replaced, so this will be the only operating engine in the world using it.

Augsburg Engine

This drawing is the final floor plan of Diesel Centrale CPM and represents a lot of thought, measuring, and rearranging.  Whew, glad thatís done!  One can see the locations of the three engines, as well as the utility room.  Doors are designed for handicap access as is the central floor.  The windows are ample and well placed.  It will be a beautiful structure.

Floor Plan

The piping for the floor heat has been placed and tested.  The heater will be installed in the utility room and will keep the building cozy all year round.

Radiant Heating

The floor was poured, and the block walls were filled with concrete.  Total of 19 yards!  Great job!

Floor Poured

Finally, all the back filling was done, and heavy rubber covers were placed.  Ahh!  Itís now ready for a long winterís nap.  2021 has seen so much progress and we are ready to have a building in 2022!

Floor Covered

 But thatís not all.  We have created a dedicated website for the project.  Itís up and running now so just look for online.  All new developments will be posted there as well as a contact tab for questions and answers.  You will always get a reply.


Diesel Centrale CPM has been an exciting, although challenging, project.  We have graciously appreciated all your donations and support.  Gordon Jones and I have spent many long hours on it but enjoyed it all.  A classic power house with three Diesels is a dream coming true.  It will truly be a World Class exhibit.  We will dream on!  As Winter is happening, I reflect back to the sunny days of Summer.  They will come again.  But for now, we all wish you and yours a very Merry Christmas and prosperous New Year.



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