Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

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Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

Postby longhaircowboy » Mon Jun 01, 2009 10:46 pm

You gotta check out this personal VTOL courtesy of DARPA.
http://www.technovelgy.com/ct/Science-F ... ewsNum=167
The Springtail EFV-4B is capable of a maximum speed of 113 miles per hour, with a hover ceiling of 11,400 feet. It can take off vertically, then fly horizontally, by shifting the angle of its rotors.

Scroll down and there's a video of a test run. I gotta get me one of things.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

Postby You Can Call Me Ray » Tue Jun 02, 2009 3:09 pm

Yeah, I saw that awhile back. Interesting concept, and as a flight controls guy I would love to know what its control margins look like, not to mention how controllable it is with one of the lift fans failed.

As for personally flying anything, I have one simple rule: It must have wings to provide lift in case of total engine failure. As an exercise, keep notes in the news of how often you hear of airplanes going down vs. when you hear of rotorcraft going down. It is astounding how lopsided the numbers are.

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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

Postby longhaircowboy » Tue Jun 02, 2009 9:33 pm

Your right about the ratio of winged vs rotored I've noticed that for some time. But could you imagine having one of these in a big city like New York? Traffic jams would be a thing of the past.
Maybe the DARPA site has some info on the control margins.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

Postby Nemo » Mon Jan 25, 2010 6:28 pm

I like the one that had a big rotor placed beneath the pilot.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospace

Postby jbondo » Sun May 02, 2010 6:37 pm

A parachute could help. I know it's not the answer but I wonder how high you have to be to say, just break your legs for example?

Probably a good idea to redesign in order to provide a primary rotor and a back up in case the primary failed. Also the EFV looks bulky for a single person to handle on a daily basis. I think jet pack technology is more promising.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospa

Postby Chorlton » Mon May 03, 2010 10:13 am

Its probably got one of those ejector parachutes that some Microlight's have.

I'm still trying to persuade the wife to let me buy one of the US homebuild Kit Helicopters.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospa

Postby You Can Call Me Ray » Mon May 03, 2010 4:52 pm

Chorlton wrote:I'm still trying to persuade the wife to let me buy one of the US homebuild Kit Helicopters.


If that is your preferred manner to "cash in your chips", then I say go for it. My personal knowledge of flying machines of all sorts causes me to have a "healthy respect" for any type of rotorcraft. So much respect that I will not fly on them if given the choice to fly a fixed-wing.

There is a reason that helicopter accidents are inherently higher in number than fixed wing accidents on a per-departure basis.

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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospa

Postby jbondo » Mon May 03, 2010 5:38 pm

Remember John Denver? What a waste! I'm not too proud to say that I loved his songs.
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Re: Springtail EFV-4B Personal Air Vehicle From Trek Aerospa

Postby Chorlton » Tue May 04, 2010 9:16 am

You Can Call Me Ray wrote:
Chorlton wrote:I'm still trying to persuade the wife to let me buy one of the US homebuild Kit Helicopters.

If that is your preferred manner to "cash in your chips", then I say go for it. My personal knowledge of flying machines of all sorts causes me to have a "healthy respect" for any type of rotorcraft. So much respect that I will not fly on them if given the choice to fly a fixed-wing.
There is a reason that helicopter accidents are inherently higher in number than fixed wing accidents on a per-departure basis.
Ray


I'm happy with my Engineering and assembling skills and actually followed a friend who built a Rotorway Exec. I was very impressed with the kit and to be honest its pretty idiotproof, with the main skills being ability to measure and drill a hole.
Ive built a Gyrocopter before back in the 80's, that was fun but pretty unstable.
The wife just isnt happy with me pissing away £20K+ for a full bore chopper. maybe I'll just buy one of those ex airforce jets and sit it in the garden revving the jet up.
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