Recent content by kach22i

I'm not here to argue the merits or efficiency of the design posted as I feel it's a distraction from the original goal stated. I am more than willing to analyze it however in a effort to understand it. I stated earlier that I thought the diverter plane was mid-point of the wheelbase or center...

Dr. D......back when I was in college 30 years ago I'm pretty sure I could have done this simple problem in 15 minutes. I figured out earthquake and wind loads on multi-story buildings in my structural courses, I just didn't want to dust off my books and take the time. This should be a...

Berkeman, I think they placed it correctly load wise, which is perhaps in conflict with aerodynamic needs. In other words, the vertical force is downward and mid-way in the wheelbase of the tow vehicle. If the vertical load is aft of the center of gravity it will lift the front wheels and...

Thread for context this question came up in: http://ecomodder.com/forum/showthread.php/how-improve-fuel-economy-tonneau-cover-124-6.html#post535358 I'm guessing we will want the answer in pounds, perhaps FT/Pounds. Ballpark numbers on horizontal, vertical and or down-force and or lift. Just...

I was thinking along the same lines. Grow a lot of sunflowers, harvest their oil, run your Diesel helicopter engine on Bio-fuel/sunflower seed oil.

Thanks for the link. I want to get the fundamentals right, then slowly move on to specific situations and see what makes them work or fail. Something general at a high school level would be fine. If a professional level paper, I'll read it a few times and maybe 20% will soak in. I took...

I'm looking for an on-line paper/article/pdf about ducted fans; "Interrupted air flow at fan inlet (subsonic), resulting in fan stall" which I can print out and read. Centrifugal, axial and or mixed-flow fans included. I have not had much luck doing a Google search on my own, perhaps I'm...

Cool, at least if used as an outer shell to block gamma rays (and add mass). Somehow I would not want to demand/expect more of them.

A fancy oven used to make certain resin/fabric combo's stronger. Don't bake anything in an oven which will ever be used to consume food in again. http://www.netcomposites.com/education.asp?sequence=62

Cool an Osprey V22 like-ish UAV. Awesome. I've been told that if I want funding for any of my dream projects that I have to make it a UAV proposal. I want those fans, how much?:wink: Full circle, hey? http://diydrones.com/photo/photo/show?id=705844%3APhoto%3A27287...

Kind of a weird assignment because many of the exotics are considered strong because they flex (and distribute energy), not because they are stiff. Think about ballistics and US army helmets deflecting bullets. I can think of one case for an airline cockpit door which was too stiff and did...

I have a hovercraft model project which is about 75% done, been that way for nine months just sitting until I have the time and money to fit it all together. Even at 1" = 1'-0" scale, I don't expect the 50 inch long model to prove or disprove any of the inlet air feed questions I have. Some...

Someday I would like to measure the thrust coming out the back of my two person hovercraft (6ft W x 10ft L). I also need a way of metering/measuring the mass air flow being drawn into the ducted fan. Any ideas on how to do that? I'm assuming both sides an equation to confirm the results...

I don't think your ideas are wacky, I also have a concept for an "electric cold jet". In lieu of clay please consider going to your local ACE Hardware store and spend some money on some West Systems Marine Epoxy, micro balloon fillers, graphite additives, fiberglass cloth and throw in some...