For those who built their airplanes for greater efficiency: At this year's Copperstate Southwest Regional Fly-in, we will be hosting another fuel efficiency contest. New for this year is an additional 200 mile competition for aircraft flying the course at 60 to 119 miles an hour average...

What problems can anyone forsee to building a 100% electric ultralight aircraft for short & mid-range commuters to get back & forth to work (aside from air traffic issues... it IS a big sky after all)? I understand the average commute is less than 30 miles in land based vehicles which would...

There seems to be some jealousy and bitter bigots trying to bad mouth this plane its ebay listing in addition to defaming me. This plane is priced to sell and built professionally and has hundreds of hour flown off of it safely. I refuse to have dialouge with any of these Keyboard Rangers...

Has there been any development of small jet engines for light aircraft, like the engines used on the Eclipse 500? Small turbines would be great for high performance homebuilts if they were cheap enough. Anything down to the price level that could compete with high horsepower Lycoming's...

Greetings, all. I'm restoring a Champ, and have a question about driving screws into a drilled 4130 tube. If I drill the proper sized hole, the screws refuse to 'take'; they simply give up their threads to the harder metal of the tube. If I over-size the hole, then the screw won't hold diddley...

This is for a hypothetical ultralight design, so just looking for suggestions here of where to look at... hopefully a 4-stroke, purchase price doesn't matter much, certification status doesn't matter either. Long time before overhaul matters A LOT... so, the longer the better. Is there anything out...

Is there a quick way to calculate what the hinge moment (or turning moment for the flap shaft for a specified condition) is for a flap on a symetrical foil

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4585166887

Please Go to : http://www.angelfire.com/wa/drdan71/ You will find an aerial photo as a tribute by Baker Company of the last Infantry Battalion in Iraq to the victims of 9-11 and the fallen heroes of the US military who died defending US and avenging the deaths of the victims of the twin tower...

I'm looking for some guidance on safely mounting instruments in an alumimium panel. Our panel is about 2mm (about 1/12th inch) thick. We had all the shapes laser cut, so everything fits well. What do most of you do with deep, heavy instruments like a gyro? Is it safe to just use the screws on the...

I just read in the newspaper that John Walton, the billionaire son of Wal-Mart founder Sam Walton, was killed in a homebuilt airplane? That got me thinking to look for a NG that might be dedicated to this activity, and I found this one. This is all new to me, quite honestly, and disturbing. ...

Hello Torque curve page 6 http://www.subaru.fr/special/pdf/documentation_diesel_lo_08.pdf by -- Volem rien foutre al païs! Philippe Vessaire Ò¿Ó¬

Most Experts Aren’t. That's something the late Smokey Yunick said back when I was a seaman deuce. Every month my mail delivers one or two messages saying it's still true. The messages usually come from some superbly experienced fellow who has literally spent his life working on cars or trucks. He...

I'm sure everyone here is familiar with the combination of the horizontal stabilizer and elevator to make a stabilator. I think I have even heard of the concept being used for a ruder. My question is has anyone ever made a plane taking the concept all the way and made a "wingeron"? My guess...

whilst taking a break from my main project (http://www.dlc.fi/~jmpaaso/experimental/), I stumbled upon the concept of Bell xp-77. Being all wooden, it appealed to me and now I would like to hear anything and everything concerning this aircraft. Are there any existing drawings ? anywhere, anyone?...

Hi, Here is a new design challenge for those of you with homebuilts with all the bells and whistles. The 2004 Toyota Prius hybrid car has a Denso electrically powered air conditioning compressor that apparently does not need to be mounted on the engine. This offers the possibility of reasonably...

Having to reject the last nicropress on the rudder, two strands were cut when the nircopress was cut off with a drmel tool. The question is whether we can reinstall a nicropress in the original position and then add one an 1/8" further?? or, Make splice two lengths of control cable with double...

I have got into plotting NACA profiles by computing. Humbly beginning with the simplest, which I presume to be NACA 4-digit, I found the Wikipedia page as a prime source of information. Plotting a symmetrical profile is not that hard: at regular intervals (=X along the chord), one calculates...

I have several Rotax (C) gearboxes for sale, brand new in box , never installed 2:62 , 3:00 , and 3:47 ratios $ 988. delivered to you in the U.S. , may take ( B) box in trade Steve (623) 842-3902

Folks - The oil pressure sensor/tube is secured to the engine block of my A-65 by a brass connector which is getting pretty chewed up; Over the years previous owners apparently using something other than the correct tool to tighten it down. I'm told (please correct me if my understanding is...