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Search: Posts Made By: quorneng
Forum: Hi-Performance and Sailplanes Yesterday, 05:14 PM
Replies: 40
Views: 576
Posted By quorneng
I suspect these type of inlets work simply...

I suspect these type of inlets work simply because there is sufficient length for the inlet shock wave to be reflected several times off the walls before it reaches the compressor.
On the Fairey...
Forum: Hi-Performance and Sailplanes Yesterday, 12:02 AM
Replies: 40
Views: 576
Posted By quorneng
As you pointed out the Bell X-1 was a rocket and...

As you pointed out the Bell X-1 was a rocket and was indeed the first supersonic plane however in 1955 this plane achieved 1132 mph (Mach 1.73).
180021
You will notice it did not have any form of...
Forum: Hi-Performance and Sailplanes 03-30-2015, 05:37 PM
Replies: 40
Views: 576
Posted By quorneng
You seem very sure jet engines do not work at...

You seem very sure jet engines do not work at supersonic speeds.
If you do some research you will find they do.
For example did the plane that held the world speed record in 1955 have a 'modified'...
Forum: Electric Ducted Fan Jets 03-26-2015, 11:18 AM
Replies: 19
Views: 525
Posted By quorneng
Calm but chilly yesterday so it had its maiden. ...

Calm but chilly yesterday so it had its maiden.
This video is actually its first proper flight as the true maiden was no more than a short low power glide.
Being a small plane the video has had to...
Forum: Electric Ducted Fan Jets 03-25-2015, 01:25 AM
Replies: 19
Views: 525
Posted By quorneng
I decided on a simple 'civil' colour scheme,...

I decided on a simple 'civil' colour scheme, purple and white!
There was some logic to the choice.
First I had a lot of acrylic purple. ;)
Second the planked fuselage has had quite a bit of...
Forum: Scratch and Kit Built Aircraft 03-23-2015, 08:02 PM
Replies: 8
Views: 214
Posted By quorneng
Yes it will reduce the prop's efficiency a bit -...

Yes it will reduce the prop's efficiency a bit - it would be rather better if the fin was a true streamline profile - I would expect you can probably hear a different prop note when its at full...
Forum: Electric Ducted Fan Jets 03-22-2015, 10:20 PM
Replies: 19
Views: 525
Posted By quorneng
The fuselage planking complete - at last - along...

The fuselage planking complete - at last - along with a hollow Depron nose cone.
179914
The canopy/battery hatch is under construction.
Need to start thinking about a suitable colour scheme. I...
Forum: Electric Ducted Fan Jets 03-19-2015, 11:26 PM
Replies: 19
Views: 525
Posted By quorneng
Now the fuselage can start to be planked. ...

Now the fuselage can start to be planked.
179893
With everything double curves each plank has to shaped to fit which is rather slow going. I keep telling my self "this is the last time" but it...
Forum: Electric Ducted Fan Jets 03-18-2015, 09:51 PM
Replies: 19
Views: 525
Posted By quorneng
At last the bits can be assembled, no easy job...

At last the bits can be assembled, no easy job with the servo wires having to be drawn through the centre section as the glued joint is brought together.
179889
It now even looks a bit like a...
Forum: Electric Ducted Fan Jets 03-17-2015, 09:00 PM
Replies: 19
Views: 525
Posted By quorneng
Just the booms and tail feather to build. The...

Just the booms and tail feather to build.
The Vampire was only 'stand off' scale and had over length booms to improve its free flight characteristics.
Those on the Venom are considerably shorter so...
Forum: Beginners 03-17-2015, 01:02 AM
Replies: 20
Views: 336
Posted By quorneng
Crashing is all part of the hobby No matter how...

Crashing is all part of the hobby
No matter how good the SAFE technology is it cannot protect you from flying into lamp posts!
It is all too easy to get impatient particularly as a beginner and not...
Forum: Beginners 03-16-2015, 01:30 AM
Replies: 269
Views: 36,940
Posted By quorneng
Flywheel The servo calculator you suggest does...

Flywheel
The servo calculator you suggest does rather confirm my own experience.
My 30 oz scale twin has a 13" x 2" elevator, flies at 30 mph and as a result manages quite happily with a 3.7g micro...
Forum: Electric Ducted Fan Jets 03-13-2015, 04:43 PM
Replies: 19
Views: 525
Posted By quorneng
The wing inner panels pose a bit more of a...

The wing inner panels pose a bit more of a problem as they have the inlet ducts in them.
The easiest way to tackle this is to build from the inside out so first the inlet duct themselves in 2mm...
Forum: Electric Ducted Fan Jets 03-12-2015, 09:41 PM
Replies: 19
Views: 525
Posted By quorneng
The outer wing panels are simple indeed having no...

The outer wing panels are simple indeed having no ribs or spar!
The Venom used a RAE symmetrical 10% wing section reducing to 7% at the tip with its maximum thickness at 42% chord.
Using just shear...
Forum: Scratch and Kit Built Aircraft 03-10-2015, 05:48 PM
Replies: 22
Views: 796
Posted By quorneng
A slightly better video of the Vampire although...

A slightly better video of the Vampire although it is still hard to see so it had to be heavily edited to show just the bits where there was anything to see! (Better in full screen)
mZg_aWAjVfU
It...
Forum: Electric Ducted Fan Jets 03-08-2015, 01:30 AM
Replies: 19
Views: 525
Posted By quorneng
The battery box support the next two formers...

The battery box support the next two formers leaving just a small 'nose piece' to give the complete fuselage shape but without any skin.
179768
A thrust test shows it delivers over 4 oz of thrust...
Forum: Electric Ducted Fan Jets 03-06-2015, 07:52 PM
Replies: 19
Views: 525
Posted By quorneng
The Vampire method of construction with all...

The Vampire method of construction with all formers held in place by the 'innards' of the fuselage worked surprisingly well so I will adopt the same principle with the Venom.
The thrust tube is...
Forum: Aerodynamics 03-06-2015, 10:41 AM
Replies: 43
Views: 3,679
Posted By quorneng
I wonder how many of the 'features' of a...

I wonder how many of the 'features' of a Dreamliner's wing (or any other modern airliner come to that) actually work in the same way (or to the same degree) at model sizes?
Forum: Electric Ducted Fan Jets 03-04-2015, 12:27 PM
Replies: 19
Views: 525
Posted By quorneng
A 'not so micro' DH Venom

Having built and flown (just!) a micro 25" Vampire with a 40mm EDF using a rather unusual Depron/balsa/tissue technique I wondered if an all Depron build would be any heavier. It would certainly be a...
Forum: Scratch and Kit Built Aircraft 03-02-2015, 03:53 PM
Replies: 7
Views: 253
Posted By quorneng
Bald Paul A tip. A CAD package is not the only...

Bald Paul
A tip. A CAD package is not the only way to produce wing rib profiles.
This set are accurately reproduced from a drawn NACA 63418 wing profile I found on the web.
179725
They are...
Forum: Scratch and Kit Built Aircraft 03-01-2015, 10:55 PM
Replies: 7
Views: 253
Posted By quorneng
Bald Paul I suppose in reality nobody just sits...

Bald Paul
I suppose in reality nobody just sits down and designs a plane just from first principles. Invariably it is a progression from previous experience - or even somebody else's!
There is...
Forum: Scratch and Kit Built Aircraft 02-28-2015, 11:11 AM
Replies: 22
Views: 796
Posted By quorneng
On the grounds I had little to loose I did...

On the grounds I had little to loose I did actually manage to maiden the Vampire early this morning before the wind got too strong but it was raining.
Not ideal conditions for a tissue covered...
Forum: Scratch and Kit Built Aircraft 02-27-2015, 10:34 PM
Replies: 55
Views: 1,942
Posted By quorneng
As the Vampire is my second build and my first...

As the Vampire is my second build and my first did fly quite successfully within the original time scale I think it would be unfair to the others to extend the dead line on my behalf.
So unless some...
Forum: Scratch and Kit Built Aircraft 02-27-2015, 11:22 AM
Replies: 55
Views: 1,942
Posted By quorneng
I do at least have the video(s) for the Canberra...

I do at least have the video(s) for the Canberra 'in the bag' so to speak but at the moment the Vampire is grounded by the weather.
Gusty 12 mph today - a bit high for a 4oz plane maiden - rising to...
Forum: Scratch and Kit Built Aircraft 02-25-2015, 11:06 PM
Replies: 39
Views: 1,252
Posted By quorneng
Bill Congratulations and well done! I...

Bill
Congratulations and well done!

I don't have snow to contend with just wind and rain!
Forum: Scratch and Kit Built Aircraft 02-25-2015, 11:32 AM
Replies: 9
Views: 288
Posted By quorneng
Very nicely done! If it is at all possible try...

Very nicely done!
If it is at all possible try a test glide over really long grass or a even crop.
The plane is now quite a bit heavier than the original so not quite so crash proof for the initial...
Forum: Scratch and Kit Built Aircraft 02-22-2015, 11:58 PM
Replies: 22
Views: 796
Posted By quorneng
The Vampire is now all ready to go. 179640 ...

The Vampire is now all ready to go.
179640
Roundels added.
Inside of the jet pipe painted black
Canopy retained with apeg at the front and a tiny magnet at the rear.
3 balsa stringers added over...
Forum: Scratch and Kit Built Aircraft 02-20-2015, 11:14 AM
Replies: 24
Views: 801
Posted By quorneng
Looks very nice. My own experience with 'wing...

Looks very nice.
My own experience with 'wing plus lifting body fuselage' is it has to be treated almost like a delta. In other words any fuselage lift is not that effective at low AoA but it does...
Forum: Scratch and Kit Built Aircraft 02-20-2015, 12:05 AM
Replies: 22
Views: 796
Posted By quorneng
Nearly there! 179619 The paint has added 0.22...

Nearly there!
179619
The paint has added 0.22 oz (6.2 g) so it now weighs 4.5 oz (127 g) ready to go. This gives a wing loading of exactly 7 oz/sqft which is rather higher than the 4.5 oz/sqft of...
Forum: Scratch and Kit Built Aircraft 02-18-2015, 04:21 PM
Replies: 22
Views: 796
Posted By quorneng
When I started to make the battery hatch I...

When I started to make the battery hatch I realised I had a problem. I had simply made the battery box too small. The battery fitted ok but then of course you have to find somewhere for the...
Showing results 1 to 30 of 500

 
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