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Not sure which kind to use. The engine should only be spinning in the 6500 rpm area. The oil will be pressurized in either use but would a fog spray for frictionless bearings have less loss or other benefits over the gallery fed friction bearings? Being a radial engine have all those connecting...

Thanks for the inputs. I don't think a centrifugal will work for me after all. I have to do more research but they apparently are limited on boost levels. Shooting for 28 psi. The engine I'm trying to build (not modify) is for an outboard use. The engine is using supercharging in place of...

Don't sleds put out this kind of power? How expensive can this drive be? An auto tranny- haven't seen any listed with the blowers so don't know what they weigh or cost. Stude is out. I'm sure if I found one it would cost a fortune and not available for production anyway. A constant speed...

Can centrifugal superchargers use a variable belt drive such as Snowmobiles use? I have a project that if they can would simplify it. This isn't a car use but wonder why this isn't done? To be clear. Running the blower at a high speed/boost with minimal engine RPM. Running the blower at its best...

I question the usefulness of this. Your keeping the worst part of a 4-cycle, the valve train. You may get more power per liter but you'll have to cram that power past those valves. Not to dissuade you since I'm following a similar course.

My Dyno question was answered but this also lead to the thinking that high HP values are always better, they're not. Past a certain point you are heavily into the compromise region and are stealing from something else to get the high HP. This could result in an engine with very high HP readings...

I understand a Dyno loads an engine already at a high rpm and takes it down for the different rpm values. If the engine were instead accelerated up while under a dyno load would this result in different readings? It was mentioned that for an Outboard engine maximum hp is a deception as the...

The machining direction doesn't matter its the final scratch direction. Although with the load this prop will see machining in that direction can't hurt. I don't know the surface finish, this could always be changed by hand either smoother or rougher.

I don't think you will find very much in any books. Most of the high performance surfacing props are built by those who have built them by trial and error. This is how the different types were discovered. Most of the information will cover submerged props and not the cyclic loading of a...

How do I calculate the thrust from a CO2 gas bottle? 2,000 PSI pressure. Looking for maximum thrust available from this power source. Does nozzle size matter?

Does anyone know of testing that shows what affect the surface roughness of the hull has on speeds over 100 mph? I've heard of recent testing that indicated a smooth surface was superior, but people who race say sanded to 220 grit is the fastest surface. I was considering coating the running...

I have one from Marks book of engineering (5-55) but it also uses terms that leads to further computation. p= mass density, lb.s^2/in^4 This has stumped me. I have no idea of what I should place in for these values. What is inches raised to the fourth? Is this mulitplied by gravity? Don't...