Kevlar has to be pretty robust to survive.There may well be... but I think that may be more about the availablity of the airplanes than the number of people who could do it. As noted, the entire peloton of the TdF could fly human powered planes quite well. Horsepower wise.
About chain, not in comparison to kevlar thread there isn't.
I bet there would be a business in having a field where people could sprint little planes up to speed and get useful hops.
I bet...only reason they fly over water is safety...less broken bones when the structure fails.The thought occurs; Would HPA records be better attempted in the middle of Death Valley in the early Spring to gain advantage of reverse altitude density, and cooler temperatures for the 'engine'?
How to make a toast using human power
In the book 'Gossamer Odyssey' it says " At 06:26 Allen signaled that he wanted a tow. When he climbed higher to clear the rescue boat he found smoother air and decided to go on." So the ground effect did not make pedaling easier!When Bryan Allen was pedaling across the Channel, the support crews had boats on the water to pick him up should he lose his ability to power the plane. He was flying at ~30' above the water, calculated to be optimum. As he got around 2/3 across, his energy level decreased and he began to gradually lose altitude. The rescue teams were right under him, ready to grab the plane and get him out. But he found that when he got about 5' above the water, the pedaling got easier because of ground effect and he was able to complete the flight.
The team got help from unexpected sources. The Channel has very busy shipping traffic. As he was half-way thru the flight, spotters for ship traffic saw an oil tanker coming along and figured it would intersect the flight. They somehow managed to contact the ship's Captain and he graciously slowed the ship down so Albatross could pass without wake-turbulence damaging the plane. The success of the project was full of lucky circumstances.
That is correct but he was still in ground effect at 15 ft. I bet the air at sea level was more turbulent...uneven.In the book 'Gossamer Odyssey' it says " At 06:26 Allen signaled that he wanted a tow. When he climbed higher to clear the rescue boat he found smoother air and decided to go on." So the ground effect did not make pedaling easier!
More power. The human body is simply too weak for the task, so it needs to be enhanced.I agree just.... I am not sure what "better" design means
Longer wings? Higher aspect ratio? Oscilating wings?
In my personal opinion.... I prefer to use actually available materials and technologies. And basic weight saving rule = keep it as simple as possible
=look " vortexosc.com "...How do you make them oscillate ?
Birds used to be huge too.
How come no one is using tjshis data in HPAs..it is common knowledge anyhow.
That is correct but he was still in ground effect at 15 ft. I bet the air at sea level was more turbulent...uneven.
Two things:I just discovered that bigger is better...increasing the Re from 100 000 to 2 000 000 at speed of M 0.04 of gave me a wing profile L/D increase from 54 to113.
Thicker batch is re 1 to 2 million and the looser group is re 100 thousand to 300 thousand.
How come no one is using this data in HPAs..it is common knowledge anyhow.
I have the latest XFLR-5 thank you. I am talking about so called form lift vs form drag. Like in Wortmann FX 63-137 they have L/D 137 at 2,5 AOA @ 1 mio Re.Two things:
1) Download the latest XFLR5: XFLR5 - Browse Files at SourceForge.net
2) An airfoil is not the same as a 3D shape, please use the plane editor when trying to look at your L/D. You can also use the NASA tool OpenVSP (which is FREE) to get much better L/D calculations instead of an infinite span airfoil cross section
I would also be mindful of the amount of drag that is created if your large propeller were to (for any reason) stop spinning.
Enter your email address to join:
Register today and take advantage of membership benefits.
Enter your email address to join: