Recent content by makoman1860

Yes that would be fantastic! Thank you!

Hey all, on my list of engines I have wanted to build, is a Mills P75. I had planned on buying one of Rodger Schroeder's kits before he passed and I missed my chance. Does anyone have a set of the plans they would be willing to part with, or know of a source? Thanks!! -Aaron

My research on that engine, which is heavily based on a maytag upright engine, ended with the name of the foundry ( now defunct ) that supplied the castings, as well as others to south bend lathe.

So what you are telling me in short, is that you are trying to find an engineering solution to a social problem? :) The way things look, Europe might just restrict themselves out of ever needing a new aviation engine. I am glad I live in a place where people still run outside to catch a glimpse...

Niels, Honestly over here in the US, there is not as much interest in the CAFE "green" stuff anymore on a corporate level. The shift seems to have gone to total performance, not efficiency, even though they are intertwined. Just a different set of needs. Fuel is plentiful, noise is not an issue...

Hi Greg, DeltaHawk is doing well, and not that far away from me. I think the cert process will finish up the summer on the 180 horse V4. Honestly that seems like a viable engine. They are fortunate to be in "engine country" here in Wisconsin and have many manufacturers local to pick brains and...

Invest? If you need design help I would be more than willing to assist with that. Send me a PM and I will give you my e-mail.

Hi Niels, Ha no I do not consider a Harley to be the best at anything (maybe marketing). Honestly I still believe a air assist DI "V" type 2-stroke would be a better road to travel down. If torque reaction is a big issue, then a concentric counter-rotating prop setup could be used. A...

Hi Niels, Haha no I'm not :). Honestly the O-320 powered planes I am used to have little prop noise, but much of that is in the blade design. Yaws and rolls....well I guess to me that's just part of flying that I never gave a second thought to. Since when is premium auto fuel criminal...

Niels, If long service life is what you are after, rotary might be a good path. Metal reeds are not an issue when designed and manufactured well. The scope of doing so is out of the realm of all but a couple companies in the world. There are new aviation engines every year, certified and...

There is always going to be asymmetric loading on an OP 2 stroke. The blowdown event is above one piston only which tends to set up a gas dynamic in the cylinder. OP engines are anything but simple, if they were, everyone would use them (if the application deemed it worthwhile), its not like its...

Hi Lohring, I get what you are saying. It seems that the root cause of the issues you have is the crankshaft design, not the general layout of a "full" crank. I am curious if your need for excessive clearance comes from the same issue. In effect you are bracing the crankshaft with the main...

That would seem much more reasonable of a design. If it were me I would eliminate the through hole in the crankpin if you plan on heat treating the crankshaft, unless you plan to hone/polish the hole. They tend to be sources of cracks. I may be a little confused by your drawing, how close is the...

Lohring, We spent a lot of time on cage and roller design. There are so many tiny details of the design and manufacturing of that type of system if you want it to live. I personally would never use a cantilever type crankshaft, too flexible.

CI and DI/SI engines have completely different needs combustion chamber wise. I was speaking of DI spark ignition multi fuel engines, not CI "diesel".