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Search: Posts Made By: quorneng
Forum: Scratch and Kit Built Aircraft Yesterday, 04:44 PM
Replies: 8
Views: 183
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 Yesterday, 01:34 PM
Replies: 8
Views: 127
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, 04:38 PM
Replies: 50
Views: 600
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, 12:32 AM
Replies: 50
Views: 600
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, 11:47 AM
Replies: 50
Views: 600
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, 11:30 AM
Replies: 50
Views: 600
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, 04:56 PM
Replies: 36
Views: 4,085
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, 03:31 PM
Replies: 18
Views: 225
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, 06:59 PM
Replies: 14
Views: 584
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, 02:50 PM
Replies: 547
Views: 33,188
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, 02:14 PM
Replies: 15
Views: 202
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...
Forum: Electric Ducted Fan Jets 10-01-2014, 01:39 PM
Replies: 29
Views: 1,077
Posted By quorneng
The completed Harrier with the 'circular'...

The completed Harrier with the 'circular' nozzles.
177594
I shall probably regret it but this time I buried all the wiring inside the hollow profile fuselage so it looks much tidier. The ESC is...
Forum: Scratch and Kit Built Aircraft 09-30-2014, 03:31 PM
Replies: 547
Views: 33,188
Posted By quorneng
I totally agree. There is nothing quite like...

I totally agree.
There is nothing quite like the satisfaction of extending a gliding flight beyond the normal duration by finding thermal lift whether model or full size.
Matched only by the...
Forum: Electric Ducted Fan Jets 09-29-2014, 12:51 AM
Replies: 29
Views: 1,077
Posted By quorneng
The 'circular' nozzle. 177553 Relatively...

The 'circular' nozzle.
177553
Relatively simple but I do have concerns with its efficiency where the vanes meet the duct at an acute angle. With the first set of 'square' nozzles each vane met the...
Forum: Vintage and old timer models 09-26-2014, 04:16 PM
Replies: 14
Views: 326
Posted By quorneng
Ledl1450 I know it depends on the layout of the...

Ledl1450
I know it depends on the layout of the plane but surely the CofG shouldn't really be a problem with a leccy conversion as you have a great heavy battery to go in as well.

It doesn't have...
Forum: Electric Ducted Fan Jets 09-24-2014, 11:30 AM
Replies: 29
Views: 1,077
Posted By quorneng
The rear duct under construction. 177508 The...

The rear duct under construction.
177508
The little triangular braces are temporary and will be removed once the skin is complete as are the discs in the duct.
The rear inner cascade vanes being...
Forum: Electric Ducted Fan Jets 09-23-2014, 05:26 PM
Replies: 29
Views: 1,077
Posted By quorneng
As the actual flight time with the cascade...

As the actual flight time with the cascade ducting installed was severely cut short from a fault that was in no way related to the ducting itself I decided to rebuild the Harrier with a completely...
Forum: Scratch and Kit Built Aircraft 09-21-2014, 01:03 PM
Replies: 14
Views: 584
Posted By quorneng
As this is not in the twin build contest any more...

As this is not in the twin build contest any more things have slowed down a bit coupled with a long period of very good flying weather!
With the rear part built the fuselage is now at its full...
Forum: Scratch and Kit Built Aircraft 09-20-2014, 05:37 PM
Replies: 68
:)
Views: 1,773
Posted By quorneng
Chellie I am a little puzzled by your ESC...

Chellie
I am a little puzzled by your ESC problem. I have several twins (and of course Concorde with 4 motors) and have never had any problem with multiple ESCs.
It almost sounds like there is some...
Forum: Scratch and Kit Built Aircraft 09-18-2014, 10:58 AM
Replies: 14
Views: 584
Posted By quorneng
Thigs move on slowly. The nose section under...

Thigs move on slowly.
The nose section under construction built the same way as a half shell over the plan.
177417
Obviously the planking is very much more complicated that the constant section ...
Forum: Indoor & Micro Electric Planes 09-17-2014, 06:14 PM
Replies: 5
Views: 228
Posted By quorneng
sentinel48 All I can suggest is that you try...

sentinel48
All I can suggest is that you try and build a scale non RC, non powered plane and see if you can get it to glide in a stable manner. Even that will not be easy.
There are some very light...
Forum: Electric Ducted Fan Jets 09-16-2014, 12:29 AM
Replies: 29
Views: 1,077
Posted By quorneng
The final part of the story - it broke. :concern:...

The final part of the story - it broke. :concern:
Not surprising really as I was doing an outside loop.
177394
Note the LH servo has been pulled out by its wire through the upper wing...
Forum: Scratch and Kit Built Aircraft 09-15-2014, 08:42 PM
Replies: 68
:)
Views: 1,773
Posted By quorneng
Sham Whilst I might agree in principle that...

Sham
Whilst I might agree in principle that flat aerofoil wings are unlikely to be scale, however at small sizes the aerodynamic penalty for using a 'flat' wing is not great, indeed it can have an...
Forum: Delta & Flying Wings 09-08-2014, 12:52 AM
Replies: 35
Views: 902
Posted By quorneng
As a delta pusher adding side thrust may not work...

As a delta pusher adding side thrust may not work that well. It will rather depend on how the delta responds to a sideways force.
All my Scale hand launched deltas do tend to an initial roll so it...
Forum: Delta & Flying Wings 09-07-2014, 11:17 PM
Replies: 35
Views: 902
Posted By quorneng
"Roll right over" What I meant was a fully...

"Roll right over"
What I meant was a fully stalled delta will not just 'drop a wing' but will roll (and will continue to do so) under the influence of motor torque until the speed builds up...
Forum: Delta & Flying Wings 09-07-2014, 02:42 AM
Replies: 35
Views: 902
Posted By quorneng
CDN71 Having the prop the wrong way round would...

CDN71
Having the prop the wrong way round would certainly make thing worse as you have all the torque but much less thrust.
To make matters worse a delta has a relatively short wing span so the...
Forum: Scratch and Kit Built Aircraft 09-03-2014, 09:17 PM
Replies: 126
Views: 4,700
Posted By quorneng
Well done. I still think those main wheels are...

Well done.
I still think those main wheels are a bit too far back, not so much a lift off as a haul off!
Forum: Scratch and Kit Built Aircraft 09-02-2014, 12:28 PM
Replies: 126
Views: 4,700
Posted By quorneng
Nigel My own thoughts are: 1. You clearly...

Nigel
My own thoughts are:
1. You clearly have sufficient thrust so it ain't that!
2. I wonder if you have too much weight on the nose wheel with the result it needs a lot of speed and up elevator...
Forum: Scratch and Kit Built Aircraft 09-01-2014, 11:32 AM
Replies: 14
Views: 584
Posted By quorneng
The nacelle has a substantial air intake and...

The nacelle has a substantial air intake and exhaust so the intention is to use it to cool the ESC.
177143
The drum mount is fixed on to the bulkhead using self tapping screws. The particle board...
Forum: Scratch and Kit Built Aircraft 08-31-2014, 10:50 PM
Replies: 68
:)
Views: 1,773
Posted By quorneng
Chellie Looking good. "thrown around...

Chellie
Looking good.
"thrown around violently" I hope its strong enough!

If the BECs are 'linear' there is no need to remove the red wire. They work quite happily together. My Concorde has all...
Showing results 1 to 30 of 500

 
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