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If you love the history of high performance IC engines, check out the site below. Plan to spend hours. Lohring Miller https://grandprixengines.co.uk/

I was asked about the "real" KV of the TenShock CZ11240 motor rated at 2680 KV. I took the measurements with the motors installed in two boats by spinning the drive shaft. One had a .150" shaft in a Teflon tube and the other had a .188" shaft in a brass tube. I was also interested in any...

This is a 3D print design for a vintage helmet. It's easy to scale it to any size. If your driver is exact scale I have the right dimensions. If you have an exact head width I can tweak the size. I can send .stl files if you want to make one. Lohring Miller

After upgrading the power plant in my P limited rigger the boat got a lot faster but was squirrely. Compared to the Mark Grim riggers, it had a shorter tub. However, Mike Hughes suggested that you can get the effect of a longer boat by moving the sponsons forward. So I printed a new set to do...

For a trip down memory lane look at page 13 for Jerry Dunlap's 3.5 mono. Model Builder December 1984 - RC Bookcase - Download Free Vintage Model Airplane Magazines, Catalogs, Books, Tutorials. Lohring Miller

Not boating but below are some objects I printed for my son, a Fallout and space fan. In the back are a Pipboy 3000 and a Brotherhood of Steel warrior in T60 armor with a mini gun. The front row are a Neel Armstrong space suit and a baby Yoda. Lohring Miller

I printed these for Brad Christy. It was a learning experience in color printing and using Inkscape to transfer a picture into a vector graphics file to import into Fusion 360. The left image is the first, all black print that I painted to give Brad an idea of what it would look like. The...

Some of you may be interested in a series I wrote about the development and construction of high power model engines. It's an attempt to preserve the heritage of a dying breed. I still have memories from the late 1950s of screaming control line speed engines fueled with shoe polish smelling...

Is a scale scale model of this boat a sport hydro in NAMBA? Would it need to be exact scale or could it be semi scale? What if it only ran one outboard? Lohring Miller

Well, my last set of 3D printed sponsons failed the stress testing. I did hit a buoy during tune up testing, but everything looked OK. I couldn't understand why the boat stopped turning during the first heat. When I brought it in it was obvious. I decided that printing with the layer lines...

I was just notified that Jim Allen died. The funeral service was today. Lohring Miller

A collection of various non boat things I've printed. Left to right are a PipBoy 3000, Niel Armstrong in suit, a Brotherhood of Steel warrior in T64 power armor, and naturally a baby Yoda. Lohring Miller

Lohring Miller

I printed several of the modified Prusa spray shields for my staff who are seeing busy emergency patients. The masks were an experiment for me. The soft silicone base makes a really great seal and with a HEPA filter are probably better than N95 masks. I couldn't resist the Darth Vader mod...

One of the first things I printed were sponsons for my P limited rigger. The great thing about 3D printing is that changes are easy so it's fun to experiment. For boat parts like these, adding perimeters with a low density three dimensional infill gives strong parts. My last efforts used 4...

I discovered some of the most comprehensive engine design information I've ever seen on another site. It combines empirical pipe design formulas with formulas for determining the port time area needed for a given power and rpm. The best part is that it's free. The only better information...

Joerg's current record holder uses sophisticated aerodynamics for both stability and low drag. A rear wing combined with forward sponsons gives good longitudinal stability. Because it runs in ground effect, quick loss of lift as its height increases gives a stable distance above the water...

Attached is a concise version of what I've been saying about the exhaust transition from the piston to the pipe.  It only applies to engines with large exhaust ports, not Zenoahs or their clones.  Lohring Miller

Read the article summarizing NASA's work on high performance pistons.  Note in the last paragraph that we (model engine users) were almost at the leading edge of engine development.  RIP K&B. Lohring Miller https://www.thefreelibrary.com/Engine makers tap carbon-carbon pistons.-a015497837

Below is some cooling information from a very experienced two stroke tuner: All the testing I have done with water cooling more , or less , in certain areas, sees only small gains individually. But combine them and the effect is synergistic. Arrange the plug threads to have water close , cut...