Search: Posts Made By: quorneng
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12-05-2022, 04:28 PM
Replies: 25
Views: 791
Posted By quorneng

If you planning on taking up to 30A from a 1000...

If you planning on taking up to 30A from a 1000 mAh battery you will be working it pretty hard. It will be a 30C discharge rate = a max of 2 minutes at full power. Such a discharge rate won't do a...
11-26-2022, 05:31 PM
Replies: 14
Views: 376
Posted By quorneng

To be exact tail mounted servos do not by...

To be exact tail mounted servos do not by themselves make the plane tail heavy provided there are necessary items towards the front that counter their weight.
What tail mounted servos do do is raise...
11-24-2022, 01:42 AM
Replies: 14
Views: 376
Posted By quorneng

aaindthu That tail assembly must be pretty...

aaindthu
That tail assembly must be pretty heavy to require the motor and battery to be so far forward. Such a layout does not effect the glide performance but it will add to the already significant...
11-23-2022, 01:22 AM
Replies: 14
Views: 376
Posted By quorneng

aaindthu Ailerons heavier? Remember you are ...

aaindthu
Ailerons heavier?
Remember you are using two servos so they can be smaller and lighter.
The powered glider in the video uses micro 3.7 g servos. In addition the servo cable as fitted to...
11-22-2022, 03:53 PM
Replies: 14
Views: 376
Posted By quorneng

aaindthu A 2m span lightweight RES glider is...

aaindthu
A 2m span lightweight RES glider is bound to be 'sluggish' in roll. The only way to get a positive roll effect is to have considerable dihedral angle. This will reduce the efficiency and...
11-16-2022, 12:06 PM
Replies: 25
Views: 791
Posted By quorneng

aaindthu Removing the inlet duct and adding top...

aaindthu
Removing the inlet duct and adding top side cheat holes looks like a good way to maintain thrust and achieve a better balanced inlet.
I do wonder if the cheat holes are big enough.
It can...
11-14-2022, 08:59 PM
Replies: 25
Views: 791
Posted By quorneng

aaindthu It is possible that your F16 will...

aaindthu
It is possible that your F16 will actually be more controllable with the underbelly duct in place.
Your EDF is at the rear of the plane and is positioned so it only draws in air from the...
Forum: Aerodynamics
11-11-2022, 10:26 PM
Replies: 7
Views: 550
Posted By quorneng

The wind speed makes absolutely no difference to...

The wind speed makes absolutely no difference to a plane once it is flying free. A change in wind speed, a gust, will effect the airspeed but the effect is only transitory until the plane reacts...
11-09-2022, 06:11 PM
Replies: 25
Views: 791
Posted By quorneng

aaindthu Don't worry I am sure your inlet is...

aaindthu
Don't worry I am sure your inlet is big enough.
As people discover the highest static thrust tends to generated by an EDF that has no inlet at all but just the moulded bell mouth, which is...
11-08-2022, 10:24 PM
Replies: 25
Views: 791
Posted By quorneng

What is the inlet area compared to the FSA? The...

What is the inlet area compared to the FSA?
The FSA of a 64 mm fan is about 2600 sqmm.
Ideally all the inlet duct should have a constant area of 1.2 * FSA so for you that is 3120 sqmm.
To achieve...
11-04-2022, 02:02 PM
Replies: 25
Views: 791
Posted By quorneng

That looks rather nice. The very sort tail...

That looks rather nice.
The very sort tail moment and the substantial fuselage area ahead of the CofG could make it a bit twitchy in pitch. Remember the full size has all sorts of electronic...
Forum: Foamies
10-20-2022, 11:00 PM
Replies: 7
Views: 519
Posted By quorneng

PlaneCrasher66 Will your new battery have a...

PlaneCrasher66
Will your new battery have a connector already on it?
What ever you do you will have to solder any joints to ensure they can carry the amps adequately.
Is it he same capacity (i.e....
Forum: Foamies
10-20-2022, 03:01 PM
Replies: 7
Views: 519
Posted By quorneng

Took a while to find out exactly what the Concept...

Took a while to find out exactly what the Concept Toy F/A 18 actually was!
A single cell LiPo is not a direct equivalent to a 4.8 NiMh. However a LiPo does not suffer the same voltage drop as NiHh...
10-19-2022, 05:02 PM
Replies: 2
Views: 683
Posted By quorneng

cap2000 You don't have to use a 'one piece' 9...

cap2000
You don't have to use a 'one piece' 9 or 10s battery. Provided they are of the same type & capacity you can use two batteries wired (6 & 3 or 6 & 4) in series. They can be charged...
Forum: Aerodynamics
10-18-2022, 11:39 AM
Replies: 6
Views: 593
Posted By quorneng

aaindthu To be fair nearly all modern fighters...

aaindthu
To be fair nearly all modern fighters are aerodynamically unstable on purpose to give them their incredible manoeuvrability. This means they cannot be flown without artificial stability and...
09-28-2022, 12:54 PM
Replies: 3
Views: 968
Posted By quorneng

John_C First you need to make sure your truck...

John_C
First you need to make sure your truck is mechanically at 100%. Any part that is not working properly is likely to absorb power that will reduce the run time of any battery.
It is the...
Forum: Beginners
09-28-2022, 11:33 AM
Replies: 5
Views: 931
Posted By quorneng

boodaghost Also be aware that LiPo c rating can...

boodaghost
Also be aware that LiPo c rating can be subject to "marketing" influences.
I have found LiPo with claimed 150c continuous rating. That would be a current giving a full discharge in just...
09-19-2022, 10:39 PM
Replies: 5,526
Views: 1,199,069
Posted By quorneng

plane You video has to be hosted on a public...

plane
You video has to be hosted on a public web site like YouTube so you can use the "link" icon in you post..
If you can't activate others peoples 'linked' videos then there is possibly some...
Forum: Beginners
08-30-2022, 08:58 PM
Replies: 1
Views: 1,905
Posted By quorneng

Airman90 With Safe selected the system will...

Airman90
With Safe selected the system will limit both the elevator and aileron travel. Further when you let go of the sticks the system will automatically return the plane to straight and level,...
Forum: Power Systems
08-17-2022, 07:25 PM
Replies: 4
Views: 1,476
Posted By quorneng

To be fair a slow fly prop "does what is says on...

To be fair a slow fly prop "does what is says on the tin". It more efficient at the low power levels likely with a slow flying plane.
"Very much horses for courses".
Forum: Power Systems
08-16-2022, 12:56 PM
Replies: 6
Views: 563
Posted By quorneng

jangodog You do not say what prop each motor is...

jangodog
You do not say what prop each motor is connected to. With no load, just running free, any of them should run without overheating the ESC. If one does then there is something wrong with it....
08-11-2022, 06:34 PM
Replies: 5
Views: 1,604
Posted By quorneng

Surely it all depends on the wing loading of the...

Surely it all depends on the wing loading of the EDF and by how much below full power is a launch possible to limit the effect of motor torque at launch speed.
As I fly from rough grass all my EDFs...
Forum: WWI Era
08-09-2022, 01:16 AM
Replies: 3
Views: 1,370
Posted By quorneng

Nice but both planes have far from scale length...

Nice but both planes have far from scale length noses. Such a pity.
188809
The Bentley & Clerget rotaries were seriously heavy. At 397 lbs making up about 40% of the empty airframe weight.
You...
Forum: Power Systems
08-01-2022, 04:25 PM
Replies: 3
Views: 1,583
Posted By quorneng

My guess is the ESC is overheating rather than...

My guess is the ESC is overheating rather than being overloaded. Is it getting sufficient airflow?
I note some of the 100a versions have a built in cooling fan. Even then it will still need a...
Forum: Beginners
07-06-2022, 02:23 PM
Replies: 29
Views: 2,586
Posted By quorneng

svanyonson Unfortunately there is no 'standard'...

svanyonson
Unfortunately there is no 'standard' for motor dimensions.
D2826 is its external length and diameter. For the A2212 the figures refer to the dimensions of the wound armature inside the...
Forum: Beginners
07-01-2022, 10:38 PM
Replies: 29
Views: 2,586
Posted By quorneng

Nice thrust test rig. :) As long as you are...

Nice thrust test rig. :)
As long as you are happy with the accuracy of the motor amps in static conditions with a 9x5 then a 15 A ESC should be fine. In flight the full power amps will reduce by...
Forum: Beginners
06-30-2022, 11:21 AM
Replies: 29
Views: 2,586
Posted By quorneng

svenyonson That 970 kV motor should be ideal...

svenyonson
That 970 kV motor should be ideal for a 9x5 on a 3s.
Note the motor wires exit from the front of that motor so you have to be careful how you run them back into the fuselage. There must...
Forum: Beginners
06-27-2022, 12:01 PM
Replies: 29
Views: 2,586
Posted By quorneng

Unfortunately by their design in runners tend to...

Unfortunately by their design in runners tend to have a higher kV for a given motor diameter. In addition as out runners are used by virtually all quads the market is much larger hence there is a...
Forum: Beginners
06-24-2022, 11:08 AM
Replies: 29
Views: 2,586
Posted By quorneng

svenyonson That looks to be a nice well made...

svenyonson
That looks to be a nice well made plane which should fly well. As a balsa/tissue construction glider I would be careful not to add too much weight. Do you know its likely total weight...
Forum: Beginners
06-22-2022, 08:03 PM
Replies: 29
Views: 2,586
Posted By quorneng

svenyonson I would be very concerned that if...

svenyonson
I would be very concerned that if the same motor was working effectively on a 5x3 then with a 9x5 the motor will be considerably over loaded.
As Ron points out a brushless motor will try...
Showing results 1 to 30 of 500
 


 
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