Shameless update from Dale Kramer

The blowing was to use the blown air to create the trailing edge if the airfoil so you could have a rotor where the clockwise edge was trailing when the rotor was spinning and then when you stop the rotor to fly the blades as wings half the blades blow out if the counter-clockwise newly trailing edge. Without this, you'd have half the rotor ballades trying to fly backwards when you convert them to fixed wings. It's a crazy idea that blowing through a slot on the lower aft edge of a blunt shape creates a trailing edge streamlined effective shape.

Interesting, could they make it like a down flap shape if they blew harder?

On Sunday, March 20, 2016 at 8:24:39 PM UTC-7, DaleKramer wrote:
Interesting, could they make it like a down flap shape if they blew harder?

There's a joke in there somewhere...

On Monday, March 21, 2016 at 12:27:00 AM UTC-4, Andy Blackburn wrote:
On Sunday, March 20, 2016 at 8:24:39 PM UTC-7, DaleKramer wrote:
Interesting, could they make it like a down flap shape if they blew harder?

There's a joke in there somewhere...

Actually I am just speculating that, depending on the blowhole angle on the lower 'TE', they might be able to affect the camber of the airfoil if the blew harder, or would that just mess up the 'phantom' airfoil profile.

I would guess that you could get some tailoring by changing pressure, but the Coanda effect really counts on boundary layer attachment and then separation to do its thing, so there are almost certainly limits. Turns out the RSRA never flew through a transition so the excitement around the hangar was speculative. Some helpful reference material on the technology.

http://www.sikorskyarchives.com/X-WING.php

https://en.m.wikipedia.org/wiki/Blown_flap

Also, some NASA concepts for personal electric VTOL:

http://ntrs.nasa.gov/archive/nasa/ca...0110011311.pdf

https://m.youtube.com/watch?v=I_KloqLa2Og

And of course even further off subject, the MD NOTAR helicopters use the Coanda effect for the anti-torque. Works beautifully in over 2,000 holding the tick of an MD520.

On Monday, March 21, 2016 at 8:07:17 AM UTC-7, Andy Blackburn wrote:
I would guess that you could get some tailoring by changing pressure, but the Coanda effect really counts on boundary layer attachment and then separation to do its thing, so there are almost certainly limits. Turns out the RSRA never flew through a transition so the excitement around the hangar was speculative. Some helpful reference material on the technology.

http://www.sikorskyarchives.com/X-WING.php

https://en.m.wikipedia.org/wiki/Blown_flap

Also, some NASA concepts for personal electric VTOL:

http://ntrs.nasa.gov/archive/nasa/ca...0110011311.pdf

https://m.youtube.com/watch?v=I_KloqLa2Og

Great links, hadn't seen that good of a Puffin desription before or the X wing archive.

On Sunday, March 20, 2016 at 1:05:18 PM UTC-7, DaleKramer wrote:
Agreed, right now I am sort of allocating 1 minute WOT electric time with about 3 minutes of reserve (even though hovering should require about 1/2 power in electrics). This is another fine tunable value when the full size vLazair is detail designed. I am hoping that I can make vertical landings that use around 30 seconds of electric time.

I suppose if you can incorporate a very accurate indicator of remaining battery life with an alarm feature, or a separate reserve battery that is switched in when the main gets low, then that might work. I can't help but visualize myself spending several minutes trying to get her lined up to the helicopter pad on my future yacht. The seas are bumpy and the breeze variable -- I think the process might take a few minutes to get landed.

If Andy flies production unit number 1 and lives, and if there are positive reviews on Amazon, I will order unit number 7.

On Monday, March 21, 2016 at 5:41:25 PM UTC-4, Steve Koerner wrote:
On Sunday, March 20, 2016 at 1:05:18 PM UTC-7, DaleKramer wrote:
Agreed, right now I am sort of allocating 1 minute WOT electric time with about 3 minutes of reserve (even though hovering should require about 1/2 power in electrics). This is another fine tunable value when the full size vLazair is detail designed. I am hoping that I can make vertical landings that use around 30 seconds of electric time.

I suppose if you can incorporate a very accurate indicator of remaining battery life with an alarm feature, or a separate reserve battery that is switched in when the main gets low, then that might work. I can't help but visualize myself spending several minutes trying to get her lined up to the helicopter pad on my future yacht. The seas are bumpy and the breeze variable -- I think the process might take a few minutes to get landed.

If Andy flies production unit number 1 and lives, and if there are positive reviews on Amazon, I will order unit number 7.

I am with you but at this point I am trying to be realistic in my empty weight predictions. I will increase battery capacity, down the road, if I can. I am really trying to build with existing technology that is available. At this stage I have a perfect 25 lbish pack in mind, by the time I build the full scale we will likely have 300+ whr/kg packs available.

Lucky #7, but Amazon reviews, I really question

Looks like this is the kind of project that gets funded nowadays on Kickstarter, the world will be such a better place

https://www.kickstarter.com/projects...?ref=discovery