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Search: Posts Made By: quorneng
Forum: Scratch and Kit Built Aircraft Yesterday, 05:17 PM
Replies: 8
Views: 138
Posted By quorneng
Certainly interesting but I suspect this will...

Certainly interesting but I suspect this will quite a challenge.
1. Yes there is a lot of fuselage area to provide lift but there is also a lot of frontal area - not good for an EDF.
2. With that...
Forum: Scratch and Kit Built Aircraft 11-22-2014, 01:57 AM
Replies: 16
Views: 341
Posted By quorneng
A bit more drawing. A scale Canberra nacelle...

A bit more drawing.
A scale Canberra nacelle with a 35mm EDF right at the back acting as a slightly over scale jet pipe.
178465
This allows virtually the entire inlet duct to be just over twice...
Forum: Scratch and Kit Built Aircraft 11-19-2014, 02:21 AM
Replies: 16
Views: 788
Posted By quorneng
The Q400 has a surprisingly thick (18%) wing at...

The Q400 has a surprisingly thick (18%) wing at the root for a fast plane and it is almost a 'sail plane' type section with the maximum thickness well aft and a slight under camber at the trailing...
Forum: Scratch and Kit Built Aircraft 11-18-2014, 06:44 PM
Replies: 56
Views: 881
Posted By quorneng
For a maiden that looked fine! The Skyvan is...

For a maiden that looked fine!
The Skyvan is pretty 'short coupled' on elevator and rudder so I would expect it to be pretty twitchy and with a high aspect ratio wing probably quite a bit of adverse...
Forum: Scratch and Kit Built Aircraft 11-15-2014, 02:15 AM
Replies: 16
Views: 341
Posted By quorneng
As my current project is neraring completion I...

As my current project is neraring completion I can start thinking about the Canberra.
First task is to create an 'outline only' 3 view.
178370
This has been developed from on a nice scale 3 view...
Forum: Scratch and Kit Built Aircraft 11-14-2014, 02:11 AM
Replies: 56
Views: 881
Posted By quorneng
My worry with your set up is the severe bending...

My worry with your set up is the severe bending moment it puts on the servo output shaft and bearing which they are simply not designed to take.
My fear is the first landing might simply break the...
Forum: Scratch and Kit Built Aircraft 11-10-2014, 01:45 AM
Replies: 13
Views: 402
Posted By quorneng
I believe it was Henry Ford who was the...

I believe it was Henry Ford who was the originator of 'there is no substitute for displacement' but I am also aware of the Colin Chapman (Lotus) motto 'To improve performance - add lightness".

It...
Forum: Scratch and Kit Built Aircraft 11-10-2014, 01:21 AM
Replies: 56
Views: 881
Posted By quorneng
mclarkson Higher numbers of servos in twins...

mclarkson
Higher numbers of servos in twins over loading the BEC?

Quite possibly but I see you are using the same servo count as you would in a single and I don't think the servos or even the...
Forum: Scratch and Kit Built Aircraft 11-08-2014, 02:14 PM
Replies: 56
Views: 881
Posted By quorneng
Hmmm If the BECs are linear it is quite safe to...

Hmmm
If the BECs are linear it is quite safe to keep both (or all four in one of mine!) red wires connected. They do not interact it is just that unless their output voltages are truly identical...
Forum: Scratch and Kit Built Aircraft 11-06-2014, 12:27 AM
Replies: 56
Views: 881
Posted By quorneng
That looks very nice. It looks like you are...

That looks very nice.
It looks like you are intending to mount the servo vertically sticking out into the air stream. Is there a reason for this?
I always mount mine on their sides so they are...
Forum: Scratch and Kit Built Aircraft 11-02-2014, 09:59 PM
Replies: 16
Views: 341
Posted By quorneng
I actually machined off the lips of the four 40mm...

I actually machined off the lips of the four 40mm AEO I used in my Concorde with a lathe. I did not disassemble them but simply held the fan casing in a 3 jaw chuck and very carefully 'parted off'...
Forum: Scratch and Kit Built Aircraft 11-02-2014, 04:04 PM
Replies: 16
Views: 341
Posted By quorneng
Steve 84g from each fan would certainly give me...

Steve
84g from each fan would certainly give me some useful performance.
I shall have to test mine in the same way to check.

To begin with I intend to build just an engine nacelle to find out...
Forum: Scratch and Kit Built Aircraft 11-02-2014, 01:50 AM
Replies: 16
Views: 341
Posted By quorneng
Bill G That is a very interesting picture and...

Bill G
That is a very interesting picture and represents another way of overcoming the inherent lack of efficiency of small fans.

I did use this sort of principle in my XB70 Valkyrie where a...
Forum: Scratch and Kit Built Aircraft 10-31-2014, 01:03 PM
Replies: 16
Views: 341
Posted By quorneng
xmech2k I estimate my Canberra will fly at...

xmech2k
I estimate my Canberra will fly at about 20mph as a result of a very low wing loading whereas the fan exit speed will be perhaps 3 times that.
This would mean that the air would simply...
Forum: Scratch and Kit Built Aircraft 10-31-2014, 03:22 AM
Replies: 16
Views: 341
Posted By quorneng
At the moment this post is more "thinking out...

At the moment this post is more "thinking out loud" than a description of the build of a Canberra with 30mm EDFs. ;)

To my horror Hobbyking quote the thrust of the AEO 30 at just 1.6oz (48g) but...
Forum: Scratch and Kit Built Aircraft 10-30-2014, 04:50 PM
Replies: 16
Views: 341
Posted By quorneng
$100 EDF Scratch Build Contest - EE Canberra

The English Electric Canberra is one of my favourites. A classic example of how to get the best out of the available power.

With this build the question is going to be can I get cheap 30mm EDFs to...
Forum: Scratch and Kit Built Aircraft 10-28-2014, 11:18 PM
Replies: 16
Views: 788
Posted By quorneng
Slowly creeping on. The tailplane. 178120 All...

Slowly creeping on. The tailplane.
178120
All 3mm Depron with the tapered balsa spar flanges as part of the skin to give the maximum depth. The Q400 tailplane uses a conventional air-foil section...
Forum: Scratch and Kit Built Aircraft 10-28-2014, 10:42 PM
Replies: 34
Views: 798
Posted By quorneng
It just so happens I have a couple of 30mm EDF in...

It just so happens I have a couple of 30mm EDF in the draw..........
Did think about a Lightning but I suspect a Canberra would be a better bet. Shorter ducts and more wing area.
Put me down...
Forum: Hi-Performance and Sailplanes 10-28-2014, 05:59 PM
Replies: 140
Views: 32,004
Posted By quorneng
Sometimes a simple transmitter with just a simple...

Sometimes a simple transmitter with just a simple 'on' switch and no programming can be more effective! :D
Forum: Scratch and Kit Built Aircraft 10-22-2014, 05:44 PM
Replies: 12
Views: 369
Posted By quorneng
It will be an interesting experiment but the...

It will be an interesting experiment but the conventional wisdom is that for the same span any benefits from the increased area from the sweep tend to be offset by the loss in aerodynamic efficiency...
Forum: Electric Ducted Fan Jets 10-22-2014, 02:34 PM
Replies: 8
Views: 219
Posted By quorneng
Maxmwill There would appear to be enough...

Maxmwill
There would appear to be enough pictures and 3 views (http://richard.ferriere.free.fr/3vues/belphegor_3v.jpg) on the net to make a reasonably accurate Belphegor but it would have to be...
Forum: Scratch and Kit Built Aircraft 10-21-2014, 05:38 PM
Replies: 50
Views: 783
Posted By quorneng
Servo lost its mind? More likely it has jumped...

Servo lost its mind?
More likely it has jumped a few teeth somewhere in the gear train and is scrap.
Was it new?
Forum: Scratch and Kit Built Aircraft 10-19-2014, 01:32 AM
Replies: 50
Views: 783
Posted By quorneng
If you do get to longer flight times it is worth...

If you do get to longer flight times it is worth providing some cooling air to the battery as it can make difference.
If you discharge it in 3 minutes (20C rate) the amount of heat you can dissipate...
Forum: Scratch and Kit Built Aircraft 10-17-2014, 12:47 PM
Replies: 50
Views: 783
Posted By quorneng
Using a single 850mAh on a 50mm EDF...

Using a single 850mAh on a 50mm EDF is....er.....a bit optimistic.
I expect it will be drawing over 20A which would make your battery work pretty hard.

My profile Harrier, with its 55mm EDF,...
Forum: Scratch and Kit Built Aircraft 10-16-2014, 12:30 PM
Replies: 50
Views: 783
Posted By quorneng
Very nice. I can't imagine you will actually...

Very nice.
I can't imagine you will actually need all that rudder power or rather if you do it will spin something shocking!
Forum: Electric Ducted Fan Jets 10-11-2014, 05:56 PM
Replies: 36
Views: 4,240
Posted By quorneng
The centrifugal fan was an interesting experiment...

The centrifugal fan was an interesting experiment but unless you can actually make use the rather higher pressures available (i.e. in a combustion chamber!) the thrust/watt is very low (about the...
Forum: Electric Ducted Fan Jets 10-08-2014, 04:31 PM
Replies: 18
Views: 288
Posted By quorneng
As Chellei says you can mount an EDF anywhere...

As Chellei says you can mount an EDF anywhere along a tube.
For example an EDF right at the front of scale Argus pulse jet duct.
177759
On a EDF V-1
177762
Or the same size EDF right at the...
Forum: Scratch and Kit Built Aircraft 10-05-2014, 07:59 PM
Replies: 16
Views: 788
Posted By quorneng
Having finished the cascade ducted Harrier work...

Having finished the cascade ducted Harrier work can start again on this.
Being a T tail the fin needs to be fairly stiff but on such a long fuselage it is also a long way back. Weight is critical so...
Forum: Scratch and Kit Built Aircraft 10-02-2014, 03:50 PM
Replies: 547
Views: 34,330
Posted By quorneng
Larry3215 It is amazing how old things come...

Larry3215
It is amazing how old things come round again but if you go back to the old A2 glider days with lifting tail planes CofG figures of 55% or more were quite common.
Forum: Batteries & Chargers 10-02-2014, 03:14 PM
Replies: 15
Views: 248
Posted By quorneng
FishHawk I am afraid it all comes down to...

FishHawk
I am afraid it all comes down to chemistry.
Lithium based chemical reactions are both more vigorous and produce a higher voltage so they generate more power per unit weight than nickel...
Showing results 1 to 30 of 500

 
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