Another E glider concept

On Sat, 29 Aug 2020 08:37:47 -0600, BobW wrote:

With luck, maybe we'll get to see how Mr. Otto's project fares in its
targeted flying niche.

Its obvious that as you make small commuter aircraft more efficient and
drive down the operating cost per hour and their small size may reduce
landing fees, but their small passenger capacity ramps up the cost of
flight crew as a fraction of ticket price in comparison with conventioinal
short-haul airliners, i.e. A320s etc.

So, I wonder how these two factors affect seat prices and hence airline
operating costs. Did Eclipse Aviation's Eclipse 500 ever get off the
ground?


--
Martin | martin at
Gregorie | gregorie dot org

Martin Gregorie wrote on 8/29/2020 10:07 AM:
So, I wonder how these two factors affect seat prices and hence airline
operating costs. Did Eclipse Aviation's Eclipse 500 ever get off the
ground?
Easy to find out: 260 delivered.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

On Sat, 29 Aug 2020 11:00:00 -0700, Eric Greenwell wrote:

Martin Gregorie wrote on 8/29/2020 10:07 AM:
So, I wonder how these two factors affect seat prices and hence airline
operating costs. Did Eclipse Aviation's Eclipse 500 ever get off the
ground?
Easy to find out: 260 delivered.

I visited what I thought was their website: http://oneaviation.aero/
but the most recent item on it is about brake tests in 2012. No delivery
details there.

Additionally, it turns out that first Eclipse Aviation and then One
Aviation have become bankrupt.

But my original point remains unanswered: for short-range commuter or
taxi service operations, at what size of aircraft does the proportion of
the ticket price due aircrew cost excssed savings due to improved
airframe efficiency and reduced landing costs?


--
Martin | martin at
Gregorie | gregorie dot org

Martin Gregorie wrote on 8/29/2020 11:32 AM:
On Sat, 29 Aug 2020 11:00:00 -0700, Eric Greenwell wrote:

Martin Gregorie wrote on 8/29/2020 10:07 AM:
So, I wonder how these two factors affect seat prices and hence airline
operating costs. Did Eclipse Aviation's Eclipse 500 ever get off the
ground?
Easy to find out: 260 delivered.

I visited what I thought was their website: http://oneaviation.aero/
but the most recent item on it is about brake tests in 2012. No delivery
details there.

Additionally, it turns out that first Eclipse Aviation and then One
Aviation have become bankrupt.

But my original point remains unanswered: for short-range commuter or
taxi service operations, at what size of aircraft does the proportion of
the ticket price due aircrew cost excssed savings due to improved
airframe efficiency and reduced landing costs?


Maybe the Celera people have that kind of info on their website.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

On Sat, 29 Aug 2020 12:49:36 -0700, Eric Greenwell wrote:

Martin Gregorie wrote on 8/29/2020 11:32 AM:
On Sat, 29 Aug 2020 11:00:00 -0700, Eric Greenwell wrote:

Martin Gregorie wrote on 8/29/2020 10:07 AM:
So, I wonder how these two factors affect seat prices and hence
airline operating costs. Did Eclipse Aviation's Eclipse 500 ever get
off the ground?
Easy to find out: 260 delivered.

I visited what I thought was their website: http://oneaviation.aero/
but the most recent item on it is about brake tests in 2012. No
delivery details there.

Additionally, it turns out that first Eclipse Aviation and then One
Aviation have become bankrupt.

But my original point remains unanswered: for short-range commuter or
taxi service operations, at what size of aircraft does the proportion
of the ticket price due aircrew cost excssed savings due to improved
airframe efficiency and reduced landing costs?


Maybe the Celera people have that kind of info on their website.

They don't, but its an interesting site anyway.


--
Martin | martin at
Gregorie | gregorie dot org

Having disturbed the plumbing, I have a pitot leak! Being a turbo, the
glider has a pneumatic switch to select between nose and tail pitot
tubes. With nose selected, there's a leak. With tail selected, things are
much worse and I can't measure any pressure at all from the tail pitot
tube.

So should I suspect the switch or the connections to the switch? And is
it possible for the switch to have an internal fault which could cause
these symptoms?

On Wednesday, September 2, 2020 at 11:00:06 AM UTC-4, John McLaughlin wrote:
Having disturbed the plumbing, I have a pitot leak! Being a turbo, the
glider has a pneumatic switch to select between nose and tail pitot
tubes. With nose selected, there's a leak. With tail selected, things are
much worse and I can't measure any pressure at all from the tail pitot
tube.

So should I suspect the switch or the connections to the switch? And is
it possible for the switch to have an internal fault which could cause
these symptoms?

Yes, pneumatic switch can fail....first check is tubing (sometimes nipping 1/4" from tubes and reattach), maybe a switch clean/lube can fix the issue. Tube nipping is what I did in '70's/'80's US cars with emissions. Just a bit to get a better seal. My method is sorta cheap/easy....check again. Some sort of pressure/vacuum device gauge is more accurate. Yes, make sure it holds a value.....I remember a spring flight where "blowing on the probe" showed needle movement....long term showed the mouse holes in cockpit tubing.....good for me, I could fly wind noise, pitch attitude, "seat of the pants".. I did a couple hours local with no real instruments..

I've used a spare altimeter and a syringe to demonstrate sealed
pneumatic hoses.Â* You could also make a simple manometer.

On 9/2/2020 9:26 AM, Charlie M. (UH & 002 owner/pilot) wrote:
On Wednesday, September 2, 2020 at 11:00:06 AM UTC-4, John McLaughlin wrote:
Having disturbed the plumbing, I have a pitot leak! Being a turbo, the
glider has a pneumatic switch to select between nose and tail pitot
tubes. With nose selected, there's a leak. With tail selected, things are
much worse and I can't measure any pressure at all from the tail pitot
tube.

So should I suspect the switch or the connections to the switch? And is
it possible for the switch to have an internal fault which could cause
these symptoms?
Yes, pneumatic switch can fail....first check is tubing (sometimes nipping 1/4" from tubes and reattach), maybe a switch clean/lube can fix the issue. Tube nipping is what I did in '70's/'80's US cars with emissions. Just a bit to get a better seal. My method is sorta cheap/easy....check again. Some sort of pressure/vacuum device gauge is more accurate. Yes, make sure it holds a value.....I remember a spring flight where "blowing on the probe" showed needle movement....long term showed the mouse holes in cockpit tubing....good for me, I could fly wind noise, pitch attitude, "seat of the pants". I did a couple hours local with no real instruments..

--
Dan, 5J

A Cristal tube water column is almost a fundamental measuring instrument.
Make the positive or negative pressure with a syringe on a tee and check the altitude difference in time.
You can also check your ASI on some speed range with this is if you have the conversion table.

If your pneumatic plumbing has leaks, I recommend this document from Mike Borgelt. It describes a thorough method of diagnosing and correcting problems with pitot, static and TE systems.

https://www.dropbox.com/s/iqklz472pw...Leaks.pdf?dl=0

Does not work with urinary leakage.