Perlan’s blog collects the thoughts and experiences of team members from the multiple disciplines needed to build and prepare the aircraft, plan the flight, and carry out the mission. Here, you’ll find insights from the designers, craftspeople, pilots, meteorologists, and support personnel who will make Perlan’s record ascents a reality. Perlan’s blog will be an opportunity to delve into the challenges and triumphs that travel with the giant sailplane.
We may have found the perfect screen display to use in the Perlan glider. The Craggy Aero “Ultimate” computer is an exciting new development in soaring instruments.
The main advantage of this computer is the large sunlight-readable screen. We tested it outdoors in full sunshine against a conventional PDA. The Ultimate is the clear winner for readability, even though the PDA had a new “transreflective” screen.
The first fuselage plug has been completely machined. Einar has come up to Bend to view the progress.
The next step is to sand the plug by hand to remove the tool grooves and then it can be sealed with paint and the molding process begins.
The first pieces of the actual, final shape of the glider are comming off the CNC machine now. These pieces will be assembled together to make a “plug” which is used to make the carbon fibre mold, which is used to make the real fuselage.
For three separate reasons, the three Perlan Project principals are all going to be at the Red Bull Air Race in San Diego next weekend. See the Red Bull Air Race web site for information about the race.
The fuselage has been lofted (again.) I think the term originates from boatbuilding, where the pattern for a new boat was first created in the sailmaker’s loft. “Lofting” has a special meaning to an engineer because it is the process whereby lines on a plan are transformed into curves in three dimensions.
While the Perlan Project has been hard at work during March, there isn’t much visible progress we can share on the blog. However, one item of research was reading Exploring the Monster by Robert F. Whelan.
Exploring the Monster, Mountain Lee Waves: the Aerial Elevator tells the story of wave soaring from its initial discovery in Germany in 1933 to the Sierra Project of 1951-52 and the Jet Stream Project of 1955. Amazingly, some of the people who flew those earliest wave flights are still alive and living in California.
You can now download the current work-in-progress simulation of the Perlan 2 glider from the x-plane.org web site. You need to register a username on x-plane.org before you download the file. You also need to have the X-Plane software.
The Perlan has flown for the first time in the X-Plane simulator. It is possible to calculate stability derivatives and control power but you get a much more immediate impression of the plane by flying it, even in a simulation. It is immediately obvious that the Perlan requires a lot of rudder to keep it straight.