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Forum: Foamies
11-17-2019, 02:17 PM
Replies: 98
Views: 11,361
Posted By quorneng

aainthu Well done! Was there a reason why you...

aainthu
Well done!
Was there a reason why you cut the power after just a few seconds into each flight?
I appreciate the understandable nerves that the plane was flying away from you but my own...
Forum: Foamies
11-13-2019, 12:40 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaithu Glad you got it flying. Certainly...

aaithu
Glad you got it flying.
Certainly adding a servo is a useful way to add ballast but shortening the nose to account for the heavier motor would be a rather more efficient solution.
Just be...
Forum: Foamies
10-28-2019, 10:57 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu That looks the business! 10 -15% of...

aaindthu
That looks the business!
10 -15% of the wing chord back from the leading edge sounds very nose heavy to me for a conventional wing although it can depend on the wing section.
The major...
Forum: Foamies
10-15-2019, 12:38 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Those ailerons look good. I am not...

aaindthu
Those ailerons look good.
I am not sure you will actually save much weight using solid on the servo as their wires are a small diameter already. Much of the weight comes from the servp...
Forum: Foamies
10-14-2019, 12:43 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu That looks very professional. Balsa...

aaindthu
That looks very professional.
Balsa reinforced foam can be very effective. Light and strong as you have found. Good load test! ;-)
Forum: Foamies
10-02-2019, 11:10 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Fair enough. Just make sure the tail...

aaindthu
Fair enough.
Just make sure the tail plane and fin are strong and rigid enough to support their relatively big control surfaces.
Remember the full size has the benefit of being an epoxy...
Forum: Foamies
10-02-2019, 12:03 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu That fuselage look very nice. ...

aaindthu
That fuselage look very nice.
Careful how you hollow out the rear fuselage. The foam you are using looks fairly weak so it will be a balance between strength and weight. Any weight saved...
Forum: Foamies
09-28-2019, 04:13 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Most definitely keep building &...

aaindthu
Most definitely keep building & posting!
It is worth remembering that long wing span gliders do not respond to rudder only commands particularly fast, there is simply too much inertia,...
Forum: Foamies
09-26-2019, 10:09 AM
Replies: 98
Views: 11,361
Posted By quorneng

The important bit about the position of the CofG...

The important bit about the position of the CofG is how far back from the leading edge it is usually expressed as a % of the width of the wing.
25% is considered a safe point. It looks like yours is...
Forum: Foamies
09-25-2019, 01:02 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Oh! Dear, bad luck. Any pictures of...

aaindthu
Oh! Dear, bad luck.
Any pictures of the new one?
I presume it has a motor.
Forum: Foamies
08-28-2019, 07:40 PM
Replies: 98
Views: 11,361
Posted By quorneng

Bear in mind that how a plane flies is not only...

Bear in mind that how a plane flies is not only effected by the CofG but also the angle of incidence of the tail plane relative to the wing. It is normally set at a small negative angle to the true...
Forum: Foamies
08-25-2019, 02:18 PM
Replies: 98
Views: 11,361
Posted By quorneng

Well done! To me that maiden flight looked fine...

Well done!
To me that maiden flight looked fine given it is a home design! Was there much damage?
There are many things you have to get right for a plane to fly well, including the skill of the...
Forum: Foamies
08-17-2019, 03:56 PM
Replies: 98
Views: 11,361
Posted By quorneng

Good load test! What made you decide to cut...

Good load test!
What made you decide to cut down the prop? At 11 inch was it drawing to many amps for the speed controller?
A 11 inch prop cut down to 9 is not quite as efficient as a true 9 if...
Forum: Foamies
08-02-2019, 02:37 PM
Replies: 98
Views: 11,361
Posted By quorneng

That looks very neat although I doubt you will...

That looks very neat although I doubt you will really need the flaps.

If I was doing it I would have used just 3 servo (ailerons and elevator) rather than 6 and placed the elevator servo right at...
Forum: Foamies
08-02-2019, 02:30 PM
Replies: 98
Views: 11,361
Posted By quorneng

That looks very neat. I do wonder if you will...

That looks very neat.
I do wonder if you will ever actually need flaps other that to play with to see what happens.

ff I was doing it i would have kept it simple and used just 3 servos (ailerons...
Forum: Foamies
07-23-2019, 09:04 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu You can run the cables through a guide...

aaindthu
You can run the cables through a guide tube but the servo and control horn should still be in the same plane or fairly close to it.
What is important is that when the servo is deflected...
Forum: Foamies
07-23-2019, 03:12 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu The tail, and the rest of the plane!,...

aaindthu
The tail, and the rest of the plane!, is indeed foam - actually Depron.
It has no under carriage so is always belly landed.
Note the tail plane is fixed to the top of the fuselage so the...
Forum: Foamies
07-23-2019, 09:42 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu That sounds reasonable for a 2.1M span...

aaindthu
That sounds reasonable for a 2.1M span glider.
Will reinforcement to the wing be required?
The success of your design is going to depend on how well you can add strength to the critical...
Forum: Foamies
07-22-2019, 09:36 AM
Replies: 98
Views: 11,361
Posted By quorneng

That looks very "professional". With no servos...

That looks very "professional".
With no servos or electrics how much does it weigh ?
High density foam may be stiffer/stronger but with the extra weight it will also crash a bit harder too!

.
Forum: Foamies
07-16-2019, 01:05 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu You will have to decide if your glider...

aaindthu
You will have to decide if your glider is worth saving.
What is the kV of your 2212 motor?
The lowest kV version I can find is 1000kV and an 11 inch (is it 11x6?) prop is rather too big...
Forum: Foamies
07-15-2019, 10:45 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu If it becomes uncontrollable as soon...

aaindthu
If it becomes uncontrollable as soon as thrust is applied I would suspect wing flexing coupled with motor torque is the problem. To do this just because of a thrust line issue it would have...
Forum: Foamies
07-10-2019, 11:38 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu You may well be right. Within...

aaindthu
You may well be right.

Within certain limits the incidence of the wing to the airflow determines the speed at which the wing generates sufficient lift to carry the weight of the plane....
Forum: Foamies
07-09-2019, 12:54 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Are you sure what is happening is just...

aaindthu
Are you sure what is happening is just down to the angle of incidence?
Could also be related to the position of the centre of gravity.
Or even some unwanted flexibility some where.
...
Forum: Foamies
06-24-2019, 12:26 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaingthu That looks quite impressive. Adding...

aaingthu
That looks quite impressive.
Adding wing span and reducing the fuselage tail length at the same time can lead to handling issues. How significant will rather depend on how much 'reserve'...
Forum: Foamies
06-17-2019, 12:05 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu Your wing load test looks quite...

aaindthu
Your wing load test looks quite adequate to me and should allow gentle aerobatics.
There is nothing wrong with "adjusting" the length of the fuselage, within reason, to get a suitable CofG...
Forum: Foamies
06-05-2019, 03:10 PM
Replies: 98
Views: 11,361
Posted By quorneng

Those proportions certainly look reasonable. T...

Those proportions certainly look reasonable.
T tails are popular in full size gliders (keeps the tail plane clear of long grass/crops when landing in a field) but can be a bit delicate in models as...
Forum: Foamies
05-21-2019, 04:39 PM
Replies: 98
Views: 11,361
Posted By quorneng

I look forward to some pictures. If you really...

I look forward to some pictures.
If you really do achieve 300 g for a 2 m span wing it will indeed be pretty light.
I hope it proves strong enough to survive more than one flight! ;) .
Forum: Foamies
05-20-2019, 11:18 AM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu With that sort of location I think you...

aaindthu
With that sort of location I think you are quite correct to keep the weight, and thus the flying speed, as low as you can, particularly as that type of "mound".hill will not produce the...
Forum: Foamies
05-11-2019, 08:21 PM
Replies: 98
Views: 11,361
Posted By quorneng

aaindthu The nearest 2m solid foam wing powered...

aaindthu
The nearest 2m solid foam wing powered glider I have is an ST330.
187469
The wings including a pair of aileron servos and an aluminium joining tube weigh 340 g.
At 240 g for your basic...
Showing results 1 to 29 of 29


 
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