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Yes Allan.  The surface area of the large Single Rear Sponson is equal to the three rears of the old SGX 90. Just in the testing stages now. The new boat is bigger than the old three sponsons SGX 90/101. So far the boat and OPS 90 combo like the ABC 2819 prop. Good racing speed in the 85 - 86...

I have now put three gallons of fuel through the OPS 45. Internally all is looking very good. Top of piston and head look new.  Virtually no metal erosion from detonation. Rod looks good. Bearings are still super smooth. In stock form the OPS 45 has achieved 78 mph in a 67 SGX-2.  I have now...

John's tanks not only look good, they work excellent too.  Solid fuel delivery right down to empty. John had a few solder joint issues in the beginning, but John has long resolved that problem Great product!  Great Service!.

Where do we sign up???  :-)

I like it.!  I Like It A Lot!!! :-D

I told you Doc would have some Eric. :-)

Jim was a gentlemen and a great r/c boat racer.  We built him some  RTR Mongoose boats in the late 80's.

"If not, you guessed wrong on the temperature and it's back to the drawing board." Or the guys that write pipe formulas guessed wrong about what those angles, diameters, locations and volumes actually do. LOL

Yup!  I saw Charlie "Out Last" them all.  And Charlie has a "No Lift" racing philosophy.  WFO baby! lol Going to miss you in 2019 Charlie!

EGT and therefore wave velocity changes a big amount by the micro second. Fuel mixture/mass and load, both of which are constantly changing, have the greatest influence. Calculations will get you on the right planet. Refinement takes lots of surveying. Man do I have a big box of chopped up...

Charlie Siler

Eric's 101 pulled the 3 blade, but not with authority.  So maybe it will be a good starter prop for the Beast OPS.

Terry Keely. 

The old OPS crank was 7mm. The new larger 8mm crank may be a help.  We will see in time.

Allan,  The 1957 is full diameter. Has a small to medium back cut. Has a very small tip cup to reduce lift and the T.E pitch is increased a small amount to 5.4" near the tip only.  Stock is 5.0". This prop drives and handles well and can be used for racing.

Terry,  The flywheel collet is still brass, but is much larger than the Picco collet. I now have about 1.5 gallons through the OPS 45 and the face of the collet that fits against the bearing shows no wear.

Put a few more tanks of 60% through the OPS 45 this weekend.  Worked upward on prop size. Finished up with the biggest prop I took to the lake.  A 1957. The OPS pulled it off the beach easily. Throttled up and down at will.  Quickly and consistently accelerated to 77 mph.  This is in a 7 pound...

For a pipe with built in muffler system the AB/CMB 67 pipe can't be beat.  Contact Stu Barr for those.

The balance on the crank seems good. So far I have run nearly a gallon through the OPS 45.   The engine is bolted to the mount with aluminum 6-32 screws. Have not had one break.

In the mid 1980s, Cats were very popular in the nitro hydro classes and did a good share of winning. Dust them off!