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Search: Posts Made By: Dave_Jackson
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Forum: Rotorheads
12th Oct 2012, 22:24
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Hi riff_raff, Today a person asked me for...

Hi riff_raff,

Today a person asked me for information on a little known Flettner proposal in the US after WW2, so a request was put on PPRuNe to see if anyone knows anything.

It happens to...
Forum: Rotorheads
6th Oct 2012, 22:25
Replies: 201
Views: 61,269
Posted By Dave_Jackson

This might, or might not, be of some interest. ...

This might, or might not, be of some interest. http://www.unicopter.com/NoIdea.gif

Annual Safety Review easa.europa.ex...
Forum: Rotorheads
27th Sep 2012, 09:22
Replies: 201
Views: 61,269
Posted By Dave_Jackson

A new article in Rotor & Wing. Designer of...

A new article in Rotor & Wing.

Designer of Electric Helo Reflects on 2011 Flight Tests...
Forum: Rotorheads
22nd Apr 2012, 18:43
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Smile Ian, OK, two rotors can do. But make...

Ian,

OK, two rotors can do.

But make that little wee one bigger, and make it point upwards where it can do some work.

Dave
Forum: Rotorheads
15th Apr 2012, 19:01
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Thumbs up "The First Electric Helicopter' in AHS Vertiflite

There is a 5-page article on Pascal Chretien's electric helicopter in the March-April 2012 issue of the American Helicopter Society's magazine Vertiflite.

On the cover it says 'The First Electric...
Forum: Rotorheads
1st Nov 2011, 18:59
Replies: 201
Views: 61,269
Posted By Dave_Jackson

slowrotor, Thanks. That Joby tilt-wing...

slowrotor,

Thanks. That Joby tilt-wing (http://www.jobyaviation.com/home.php) is an interesting concept. Particularly attractive is the ability of motors to be run at higher then rated capacity...
Forum: Rotorheads
31st Oct 2011, 16:09
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Hi slowrotor, Could this be the type of...

Hi slowrotor,

Could this be the type of slow and reliable craft that you've been looking for? http://www.unicopter.com/Wink.gif


Dave
Forum: Rotorheads
26th Oct 2011, 21:11
Replies: 201
Views: 61,269
Posted By Dave_Jackson

. http://www.unicopter.com/NoNo.gif ...

.

http://www.unicopter.com/NoNo.gif

Guinness World Record (http://www.guinnessworldrecords.com/records-9000/first-electric-helicopters/)


Strange. Apparently, the names of those who post...
Forum: Rotorheads
17th Oct 2011, 21:42
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Electric Backpack Helicopter ~ by Frans Schoeffmann

Franz Schoeffmann is the builder and pilot of this engine driven backpack helicopter (http://www.unicopter.com/1764.html#Schoeffman).

He mentioned that he has just about completed an electric...
Forum: Rotorheads
4th Oct 2011, 18:17
Replies: 201
Views: 61,269
Posted By Dave_Jackson

victor papa, Pascal Chretien, who flew the...

victor papa,

Pascal Chretien, who flew the first electric helicopter a couple of months ago, is also moving his interest toward hybrid propulsion for helicopters.


Sikorsky's patent...
Forum: Rotorheads
23rd Sep 2011, 18:27
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Lonewolf_50, Your points are good from a...

Lonewolf_50,

Your points are good from a overall perspective.

AdamFrisch references the aviation industry. To my knowledge, Lycoming and Continental have not improved their engines over the...
Forum: Rotorheads
17th Sep 2011, 21:58
Replies: 201
Views: 61,269
Posted By Dave_Jackson

ross_M The advantages of combining a...

ross_M

The advantages of combining a limited amount of electrical storage (battery or capacitor etc) with the hybrid source are;

1/ The power from the electrical storage device is combined...
Forum: Rotorheads
13th Sep 2011, 19:44
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Rraetor, If '"pushing" the shaft' implies...

Rraetor,

If '"pushing" the shaft' implies rotating a shaft that is common to, or concentric with, the aero-rotor and the motor; then it is a viable idea. In fact, this idea has previously been...
Forum: Rotorheads
7th Sep 2011, 18:01
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Pascal has asked that this link be posted on...

Pascal has asked that this link be posted on PPRuNe. It provides more information on his craft, and a respect for the support he received.

First manned electric helicopter flies...
Forum: Rotorheads
5th Sep 2011, 19:10
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Hi Mart, The feat was released on Gizmag...

Hi Mart,

The feat was released on Gizmag last night. It gives more information on his craft and the initial flights.

Modern-day aviation pioneer achieves world's first untethered, manned...
Forum: Rotorheads
4th Sep 2011, 19:35
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Yes. The lithium-ion batteries are one of the...

Yes. The lithium-ion batteries are one of the risks that exist in the development of this new type of helicopter.

The batteries have a combination of conduction and convection based cooling.
...
Forum: Rotorheads
3rd Sep 2011, 20:01
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Thumbs up World’s First Manned Electric Helicopter takes off

.
The World’s first manned flight of a 100% electric powered helicopter was conducted on the 12th of August 2011, after 2 weeks of tethered flight tests. This machine, designed and test flown by...
Forum: Rotorheads
13th Sep 2010, 18:36
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Squeaks, The specific Torque-Pitch Coupling...

Squeaks,

The specific Torque-Pitch Coupling does not exist in current helicopters. It is an innovation that is intended to simplify the pilot's control of very light recreational helicopters. The...
Forum: Rotorheads
12th Sep 2010, 15:54
Replies: 201
Views: 61,269
Posted By Dave_Jackson

cattletruck, you're right. It may be a race to...

cattletruck, you're right. It may be a race to see if effective electrical storage or a cure for cancer comes first.


Regarding an all-electric tail rotor, The current project involves the...
Forum: Rotorheads
11th Sep 2010, 18:42
Replies: 201
Views: 61,269
Posted By Dave_Jackson

The future of electric power in VTOL craft is...

The future of electric power in VTOL craft is more than the simple replacement of a gas engine with an electric motor.

It is about the ability to provide unique enhancements, which today's...
Forum: Rotorheads
26th May 2004, 17:43
Replies: 201
Views: 61,269
Posted By Dave_Jackson

A bit of trivia

Nick.

You're right about public relations.

France gets 70% of its electrical energy from nuclear plants. They have (maybe no longer) weekly public tours of a shut down facility and also a...
Forum: Rotorheads
26th May 2004, 05:30
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Hi Nick, I'm sure you agree that electricity...

Hi Nick,

I'm sure you agree that electricity will eventually replace fossil fuels. Naturally, this will require significant improvements in the means of producing the electrical energy, storing...
Forum: Rotorheads
25th May 2004, 22:15
Replies: 201
Views: 61,269
Posted By Dave_Jackson

There are electric motors using rare earth...

There are electric motors using rare earth magnets and brushless commentators that have a horsepower to weight ratio of one-to-one. They turn at around 60,000 rpm

Also, there is a Russian design...
Forum: Rotorheads
23rd May 2004, 19:09
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Lightbulb 'Empty weight' is the bane of rotorcraft.

Decreasing the weight of the fuselage, the rotor and the power-train by using plastics (composite construction) will be a significant improvement.

Combining this with the previously mentioned...
Forum: Rotorheads
17th May 2004, 20:02
Replies: 201
Views: 61,269
Posted By Dave_Jackson

Smile More

An all-plastic battery (http://www.jhu.edu/~jhumag/0297web/scitech.html#battery)
Forum: Rotorheads
15th May 2004, 19:14
Replies: 201
Views: 61,269
Posted By Dave_Jackson

A contribution to the thread

Helicopter - Coaxial - Electric Motor Located between Rotors (http://www.unicopter.com/0812.html)
Showing results 1 to 26 of 26


 
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