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Search: Posts Made By: quorneng
Forum: Electric Ducted Fan Jets 07-27-2016, 08:05 PM
Replies: 35
Views: 320
Posted By quorneng
Those 4s figures look a bit suspicious. First...

Those 4s figures look a bit suspicious.
First set
Vm: 14.42
Ap: 43.44
Wp: 656.3

Second set
Vm: 14.18
Ap: 35.32
Wp: 884.2
Forum: Electric Ducted Fan Jets 07-25-2016, 06:24 PM
Replies: 74
Views: 5,809
Posted By quorneng
DEG Thanks for the compliment. For its...

DEG
Thanks for the compliment.

For its second VTO flight I left everything as it was but went a bit higher.
CCP8CtcoWRg
After the burst of power for the VTO (824W!) it actually flies on only...
Forum: Foamies 07-20-2016, 12:45 AM
Replies: 11
Views: 264
Posted By quorneng
Champstarr Its all to do with the Kv of the...

Champstarr
Its all to do with the Kv of the motor.
Although the Power 25 is physically bigger its higher kV means it will try to drive the prop faster by 1250/850 = 1.5 times. The speed square law...
Forum: Beginners 07-16-2016, 10:41 AM
Replies: 13
Views: 503
Posted By quorneng
From the flight characteristics you describe it...

From the flight characteristics you describe it certainly sounds like you are trying to fly too slowly. This causes the secondary effect of the control surfaces to become significant so it feels like...
Forum: Electric Ducted Fan Jets 07-11-2016, 03:02 PM
Replies: 74
Views: 5,809
Posted By quorneng
With more really calm weather I plucked up...

With more really calm weather I plucked up courage to do a 'vertical' take off.
p7fmh7k4GgE
It proved to be a bit of a non event - it just went up!
As I was not sure about the 'heading hold'...
Forum: Electric Ducted Fan Jets 07-07-2016, 04:32 PM
Replies: 74
Views: 5,809
Posted By quorneng
To cut a long story short I built another A4b 25%...

To cut a long story short I built another A4b 25% bigger so it could carry the 70mm EDF without too high a wing loading.
Built in the same way as before and keeping with 2mm Depron meant it was...
Forum: General Electric Discussions 06-28-2016, 09:59 PM
Replies: 27
Views: 669
Posted By quorneng
Posted in error

Posted in error
Forum: Electric Ducted Fan Jets 06-24-2016, 03:45 PM
Replies: 74
Views: 5,809
Posted By quorneng
So next is the larger and more power "vertical...

So next is the larger and more power "vertical riser" version using the abandoned 70 mm EDF which can for short periods be used with a 4s and generates about 45 oz thrust.
If the all up weight can...
Forum: Electric Ducted Fan Jets 06-24-2016, 03:16 PM
Replies: 6
Views: 436
Posted By quorneng
Very impressive but I am not sure it every went...

Very impressive but I am not sure it every went into true 'wing lift only' level flight.
Forum: Delta & Flying Wings 06-20-2016, 12:10 AM
Replies: 11
Views: 462
Posted By quorneng
solentlife The recommended prop for an Emax...

solentlife
The recommended prop for an Emax 2822 is 9" or 10". It needs to be that size to get anything like the motors maximum rated power on a 3s. I am using a 9x5 with both 2 and 3 blades on my...
Forum: UAV / FPV 06-17-2016, 10:54 PM
Replies: 5
Views: 215
Posted By quorneng
It would appear it was an autonomous flight. No...

It would appear it was an autonomous flight. No pilot input required.
Still illegal in many countries.
Forum: Scale E-Powered Aircraft 06-13-2016, 09:49 PM
Replies: 11
Views: 573
Posted By quorneng
I use the same a Mog2112. So cheap I bought 2...

I use the same a Mog2112.
So cheap I bought 2 but they have both performed faultlessly for over 2 years.
I always use the tester on everything (including the ESC and the motor) on initial...
Forum: ParkFlyers 06-11-2016, 08:08 PM
Replies: 11
Views: 1,962
Posted By quorneng
Just to complete the story the motor, ESC and...

Just to complete the story the motor, ESC and battery in their final positions.
Note down thrust and the Depron 'behind the prop' spinner!
183923
I doubt very much it makes that much difference...
Forum: General Electric Discussions 06-09-2016, 03:02 PM
Replies: 52
Views: 1,305
Posted By quorneng
Or if you are an RC glider pilot in a good...

Or if you are an RC glider pilot in a good thermal and say to your self
"Its high, far away and getting hard to see but I will let it do one more circle...."
Forum: Beginners 06-06-2016, 10:30 AM
Replies: 11
Views: 423
Posted By quorneng
Greg The reason there is no switch in the...

Greg
The reason there is no switch in the receiver circuit is that it would still leave the motor connected through the ESC directly to the battery. The motor could start at any time.
Props on...
Forum: Delta & Flying Wings 06-04-2016, 11:29 AM
Replies: 42
Views: 1,538
Posted By quorneng
mclarkson Perhaps what you have identified is...

mclarkson
Perhaps what you have identified is that flying wings are tricky.

I find conventional airframes hard enough to get 'exactly' right.
Forum: General Electric Discussions 05-31-2016, 11:14 PM
Replies: 28
Views: 579
Posted By quorneng
Are you sure you are just not flying to close to...

Are you sure you are just not flying to close to its stall speed?

If you are flying too slow as you turn the inside wing slows down and it causes the wing tip to actually start to stall which...
Forum: Delta & Flying Wings 05-31-2016, 07:09 PM
Replies: 42
Views: 1,538
Posted By quorneng
The big Northrop YB49 used a NACA 65-019 section...

The big Northrop YB49 used a NACA 65-019 section and it does not look much like the one you are using! ;)
http://www.airspace.cz/akademie_letectvi/media/2011/11/39-NACA-65-019.jpg
Forum: Scale E-Powered Aircraft 05-30-2016, 01:16 AM
Replies: 2
Views: 245
Posted By quorneng
It can be done but you need really light...

It can be done but you need really light cylinders!
183830
183831
If you use a motor that can turn a scale size prop the power absorbed from spinning the cylinders is not too great.
183832
But...
Forum: General Electric Discussions 05-22-2016, 01:21 PM
Replies: 2,610
Views: 235,450
Posted By quorneng
That look very neat An 8x4 on an 2822 sounds a...

That look very neat
An 8x4 on an 2822 sounds a bit small unless you are using a 4s.

Hopefully a flight video?
Forum: General Electric Discussions 05-12-2016, 09:13 PM
Replies: 29
Views: 920
Posted By quorneng
Is that really correct? On full size (even...

Is that really correct?

On full size (even one with simple flaps) two different (flaps up/flaps down) stall speeds are quoted on the placard.
The simple flaps on the Mk1 Spitfire made quite a...
Forum: Beginners 05-06-2016, 11:58 PM
Replies: 13
Views: 557
Posted By quorneng
rejma0415 The one thing you have not determined...

rejma0415
The one thing you have not determined is just how much current the motor is actually taking. In other words you need a Watt meter.
If your 400 brushed motor is actually taking close to...
Forum: Scratch and Kit Built Aircraft 04-24-2016, 10:22 PM
Replies: 246
Views: 23,721
Posted By quorneng
Nigrl 4 x 40mm EDF Concorde is not that easy -...

Nigrl
4 x 40mm EDF Concorde is not that easy - so little thrust! ;)
Forum: Scratch and Kit Built Aircraft 04-20-2016, 08:24 PM
Replies: 37
Views: 1,253
Posted By quorneng
Is not the fact that is flies tail heavy...

Is not the fact that is flies tail heavy suggesting that it is not actually a 'double' wing but a single wing with a large, close coupled, flat section tailplane?
Forum: General Electric Discussions 04-16-2016, 10:48 PM
Replies: 25
Views: 784
Posted By quorneng
Just remember if you were landing a full size Cub...

Just remember if you were landing a full size Cub on the equivalent size of grass to your plane you would be using huge 'Alaska' tyres for sure.
Forum: Electric Ducted Fan Jets 04-15-2016, 04:08 PM
Replies: 78
Views: 2,552
Posted By quorneng
Does running a battery down to the ESC's LVC...

Does running a battery down to the ESC's LVC ensure the battery is at 3.8V per cell?

The ESC is not measuring the individual cell voltages but only that the total battery voltage is equivalent to...
Forum: Electric Ducted Fan Jets 04-15-2016, 03:55 PM
Replies: 30
Views: 17,816
Posted By quorneng
jibwalker It is the area of the EDF minus the...

jibwalker
It is the area of the EDF minus the area of the hub not the diameters.
In your case the area of the EDF is
Pi x 27 x 27 / 4 = 572 sq mm
The area of your hub is
Pi x 14 x 14 / 4 = 153...
Forum: General Electric Discussions 04-14-2016, 05:55 PM
Replies: 18
Views: 634
Posted By quorneng
Konrad You did not say what the two failures...

Konrad
You did not say what the two failures you witnessed were attributed to.
Component failure on an otherwise sound installation or a failure as a result of a poor installation. The first is a...
Forum: Beginners 04-08-2016, 10:25 AM
Replies: 46
Views: 1,151
Posted By quorneng
Seems a pity the OP has not replied. I wonder...

Seems a pity the OP has not replied.
I wonder if all these issues has put him off.
Forum: Electric Ducted Fan Jets 04-04-2016, 10:53 AM
Replies: 78
Views: 2,552
Posted By quorneng
dereckbc But it quite reasonable to compare the...

dereckbc
But it quite reasonable to compare the Ah capacities of two batteries with the same cell count and that use the same chemistry. In your example the batteries are clearly called something...
Showing results 1 to 30 of 500

 
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