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Search: Posts Made By: quorneng
Forum: Scratch and Kit Built Aircraft 04-19-2014, 08:28 PM
Replies: 131
Views: 3,377
Posted By quorneng
The same good conditions that allowed the XB70...

The same good conditions that allowed the XB70 maiden encouraged me to 'have a go' with the Concorde.
With its much lower thrust to weight the first flight was always going to a bit heart-in-mouth,...
Forum: Scratch and Kit Built Aircraft 04-19-2014, 11:48 AM
Replies: 45
Views: 758
Posted By quorneng
fhhuber On the original the canards were 'all...

fhhuber
On the original the canards were 'all moving' for trim but had conventional elevators as well.
I intend to use just the elevators. The canard is already set parallel to wing.

I have...
Forum: Scratch and Kit Built Aircraft 04-18-2014, 11:31 PM
Replies: 45
Views: 758
Posted By quorneng
pmullen503 I had intended to use elevons but...

pmullen503
I had intended to use elevons but the 'elevon' function on my Orange 3 axis Rx does not seem to work (and neither does the V tail mixer!).
I then tried a separate mixer unit (I have used...
Forum: Scratch and Kit Built Aircraft 04-18-2014, 08:06 PM
Replies: 45
Views: 758
Posted By quorneng
pmullen503 It uses separate elevator and...

pmullen503
It uses separate elevator and ailerons. As the space between the wide duct and the wing tip is limited it means they are rather small.
This is why I intend to use the canard so all the...
Forum: Scratch and Kit Built Aircraft 04-18-2014, 01:10 PM
Replies: 45
Views: 758
Posted By quorneng
Nice weather and it does fly. Just a quick...

Nice weather and it does fly.
Just a quick couple of circuits and a safe landing.
Stable, in fact almost too stable, with rather week control response.
I judged it was a bit nose heavy so I...
Forum: Scratch and Kit Built Aircraft 04-18-2014, 12:31 AM
Replies: 45
Views: 758
Posted By quorneng
I am sure a catapult would work except there is...

I am sure a catapult would work except there is almost nowhere on the plane that is strong enough to mount for the hook - especially for 5 times it weight! - without quite a bit of additional...
Forum: Electric Ducted Fan Jets 04-18-2014, 12:07 AM
Replies: 33
Views: 466
Posted By quorneng
To call an over size intake an air brake is not...

To call an over size intake an air brake is not quite the whole story.
It is not as if it is like a flat plate perpendicular to the air stream as most of the air reaching it actually enters the...
Forum: Scratch and Kit Built Aircraft 04-17-2014, 12:29 PM
Replies: 45
Views: 758
Posted By quorneng
xmech2k I am not sure the AEO fan is rated for...

xmech2k
I am not sure the AEO fan is rated for 4s but I doubt I will need more power as the static thrust on a 3s will be at least equal to its weight.

Now virtually complete with all the...
Forum: Scratch and Kit Built Aircraft 04-16-2014, 10:37 PM
Replies: 45
Views: 758
Posted By quorneng
With the nose taped in place it gives an idea of...

With the nose taped in place it gives an idea of it size.
175230
A quick check on the internal diminsions of my car confirmed it could be safely transported in one piece which meant the nose could...
Forum: Scratch and Kit Built Aircraft 04-15-2014, 10:45 PM
Replies: 45
Views: 758
Posted By quorneng
The ESC is installed close to the EDF. 175157 ...

The ESC is installed close to the EDF.
175157
The rx (an Orange 3 axis stabilised unit is mounted slightly further forward.
175158
With the nose temporarily taped in place the battery position...
Forum: Scratch and Kit Built Aircraft 04-15-2014, 12:27 AM
Replies: 45
Views: 758
Posted By quorneng
pmullen503 The lower surface of the plenum is...

pmullen503
The lower surface of the plenum is indeed supported by the divider which is 'hung' directly off the wing underside. The wing itself is plenty stiff enough to resist the plenum pressure. ...
Forum: Scratch and Kit Built Aircraft 04-14-2014, 03:05 PM
Replies: 45
Views: 758
Posted By quorneng
The top skin goes on making the wing a whole...

The top skin goes on making the wing a whole stiffer!
175035
Each wing half required nearly 2m of POR glue line. This took some time to apply so the skin had to be placed very accurately as there...
Forum: Scratch and Kit Built Aircraft 04-12-2014, 10:40 PM
Replies: 131
Views: 3,377
Posted By quorneng
More or less finished with light spray of acrylic...

More or less finished with light spray of acrylic white.
175019
Getting close to the maiden but will have to wait for the right weather.
Forum: Scratch and Kit Built Aircraft 04-07-2014, 10:57 PM
Replies: 131
Views: 3,377
Posted By quorneng
The battery hatch just about completes the...

The battery hatch just about completes the structural bits.
174529
The four tiny magnets hold it closed.
174530
Still quite a bit of filling of various small scratches and dents (the basic...
Forum: Scratch and Kit Built Aircraft 04-07-2014, 01:39 PM
Replies: 215
Views: 5,673
Posted By quorneng
Nigel 4Ss certainly seems to have given it an...

Nigel
4Ss certainly seems to have given it an appropriate performance.
Nice!
Forum: Scratch and Kit Built Aircraft 04-06-2014, 04:53 PM
Replies: 131
Views: 3,377
Posted By quorneng
Slowly creaping forward. The first time it has...

Slowly creaping forward.
The first time it has all been put together.
174506
Still got the battery hatch to make.
The nose is held in place by 3 Depron/balsa tongues and is intended to "knock...
Forum: Scratch and Kit Built Aircraft 04-04-2014, 02:42 PM
Replies: 131
Views: 3,377
Posted By quorneng
Nigel During testing I ran with 1,2,3 and 4...

Nigel
During testing I ran with 1,2,3 and 4 BECs connected. It made no difference at all. I subsequently found that it is quite in order to have multiple linear BECs connected (particularly if...
Forum: Scratch and Kit Built Aircraft 04-03-2014, 11:29 PM
Replies: 131
Views: 3,377
Posted By quorneng
As the fuselage is a true stressed skin structure...

As the fuselage is a true stressed skin structure the battery box itself has to be load carrying to make up for the loss of skin from the battery hatch.
The completed battery box.
174470
With the...
Forum: Scratch and Kit Built Aircraft 04-02-2014, 12:12 AM
Replies: 131
Views: 3,377
Posted By quorneng
With all four ESC installed and their wires run...

With all four ESC installed and their wires run through the wing to the fuselage a full power test.
clTb5tY64xI
Interesting the four ESCs arm in perfect unison!
The ESCs to radio connections use a...
Forum: Scratch and Kit Built Aircraft 03-28-2014, 08:30 PM
Replies: 45
Views: 758
Posted By quorneng
The wing is built in the same way as for my...

The wing is built in the same way as for my Concorde. 2mm Depron skins over closely spaced Depron shear webs with no other reinforcing.
The main part of the duct itself is just an open topped box in...
Forum: Scratch and Kit Built Aircraft 03-26-2014, 09:51 PM
Replies: 131
Views: 3,377
Posted By quorneng
As I was not entirely happy with the Red Brick...

As I was not entirely happy with the Red Brick ESCs I have decided to replace them with 20A Mystery ones which actually fit better into the space available.
Each ESC will have its own solid wire...
Forum: Scratch and Kit Built Aircraft 03-24-2014, 03:10 PM
Replies: 45
Views: 758
Posted By quorneng
As the XB70 fuselage has amuch smaller section...

As the XB70 fuselage has amuch smaller section than Concorde it would be built from thicker 3mm Depron. Apart from any stiffness benefit the extra skin thickness allows a bit more of a 'sanding...
Forum: Scratch and Kit Built Aircraft 03-23-2014, 07:10 PM
Replies: 52
Views: 1,672
Posted By quorneng
Well done! An interesting subject. A belly...

Well done!
An interesting subject.
A belly take off with a 'wing' is quite an achievement.
I have found that the nose down on launch from a high mounted prop is not solely due to aerodynamics but...
Forum: Scratch and Kit Built Aircraft 03-22-2014, 05:08 PM
Replies: 45
Views: 758
Posted By quorneng
Flywheel Indeed everything to exact scale...

Flywheel
Indeed everything to exact scale except the wing section. It will be the correct thickness ratio (3%!) but with a bi-convex section. The original's wing section was actually a flat hexagon...
Forum: Scratch and Kit Built Aircraft 03-22-2014, 01:25 PM
Replies: 45
Views: 758
Posted By quorneng
Nigel You do have to be careful of static...

Nigel
You do have to be careful of static thrust figures for EDF units 'stand alone' in free air, particularly with a generous bell mouth in place. It alone can add more than 10% to the thrust.
It...
Forum: Scratch and Kit Built Aircraft 03-21-2014, 06:56 PM
Replies: 45
Views: 758
Posted By quorneng
pmullen503 HobbyKing show the AEO 70mm...

pmullen503
HobbyKing show the AEO 70mm delivering 24oz thrust on a 3s (12.6V) but with a 3300 kV motor drawing 28A. On a 4s they claim 32oz drawing 38A
My 6 nozzle 24" long duct delivered 27oz...
Forum: Scratch and Kit Built Aircraft 03-21-2014, 04:24 PM
Replies: 45
Views: 758
Posted By quorneng
Although the airflow path may seem convoluted in...

Although the airflow path may seem convoluted in fact the duct expands fairly smoothly to several times the FSA thus slowing the flow down and reducing duct losses. The air is only speeded up again...
Forum: Scratch and Kit Built Aircraft 03-20-2014, 08:40 PM
Replies: 45
Views: 758
Posted By quorneng
Another Depron Delta but with 6 jets!

6 exhausts yes but only one fan.
Can you tell what it is yet?
A North American XB70.
174236
A truly impressive beast that could cruised for 2000 miles at close to Mach 3 with its first flight 40...
Forum: Scratch and Kit Built Aircraft 03-17-2014, 08:20 PM
Replies: 131
Views: 3,377
Posted By quorneng
The voltage spikes are due to the inductance of...

The voltage spikes are due to the inductance of the ESC to battery wires caused by the rapidly pulsed current from the ESC switching.

Just a bit further forward. The controls have been retested...
Forum: Scratch and Kit Built Aircraft 03-16-2014, 06:37 PM
Replies: 131
Views: 3,377
Posted By quorneng
To physically run the motor to ESC (and the ESC...

To physically run the motor to ESC (and the ESC to battery) wires through the wing has meant they are actually touching, indeed they are probably twisted together as well.

On the ESC to battery...
Showing results 1 to 30 of 500

 
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