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Flying Wings - Homemade

Old 10-21-2018, 12:38 AM
  #26  
Don Sims
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Make sure the prop isn't on backwards. Letters face the front of the plane.
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Old 10-21-2018, 09:45 AM
  #27  
aaindthu
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I chucked it again to see how it glides. It flies straight with all the trailing edge raised up (reflex). The elevator reflex alone is not sufficient, so I raised the complete trailing edge upwards and it glides straight now.

I cannot maiden it today as the weather here does not look good. It may rain.

The wing weighs 604 grams or 21.3 oz. It feels heavy but take this E-flite Opterra for comparison. Opterra is 2m span wing and weights 67 oz which is nearly 2 Kg !!
But the Opterra still looks so gentle in air ! Can't say about my wing yet because I have not flown it yet. For the same wingspan, and a lot lesser weight my wings should fly as gentle as the Opterra. I will maiden it next weekend.
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Old 10-23-2018, 09:06 AM
  #28  
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I realized that my flying wing has a lot of nose weight. That's the reason it requires so much reflex to fly straight.

So.. I used this website to calculate the CoG location on my wing - https://fwcg.3dzone.dk/
and it comes to 27.5 cm from the leading edge. Root Chord length is 50 cm.

So... I am modifying my wing a lot. Going to move the motor back towards the trailing edge till I get the CoG right.
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Old 10-23-2018, 12:43 PM
  #29  
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ALL flying wings have reflex ... its a common trait for them.

My wings average about 5mm up on elevons ....

Nigel
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Old 10-23-2018, 04:24 PM
  #30  
aaindthu
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Originally Posted by solentlife View Post
ALL flying wings have reflex ... its a common trait for them.

My wings average about 5mm up on elevons ....

Nigel
Nigel,

I am trying to achieve just that, about 5mm up on elevons. But, what I had was a full deflection of the whole trailing edge (in addition to the elevons), just to keep the nose up! Then I realized it was nose heavy.

So I am modifying it totally, for the better.
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Old 10-23-2018, 04:30 PM
  #31  
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OK ...

Nigel
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Old 10-24-2018, 12:34 AM
  #32  
quorneng
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aaindthu
I think you are discovering why it is not so simple to set up a wing to fly well!
Just don't move the CofG back much at any one time. Too much and it will be absolutely uncontrollable.
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Old 10-24-2018, 08:14 AM
  #33  
solentlife
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I have to agree with Q ... only a slight rearward CoG and wings take on a completely alien character !!

Its why I use the hanging method to balance them ... a U shaped wire glued into the CoG point dead centre of span ... hang the wing and adjust items till it balances in all axis.

Then add slight UP on the elevons !!

Never found test glide to be much use with a wing ... think its because which way you launch makes a huge difference that can confuse the results.

Nigel
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Old 10-24-2018, 03:11 PM
  #34  
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You might consider moving the prop behind the wing to give it more effectiveness. just balance you c g limit so it rotates on take off and you should ok...
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Old 12-30-2018, 07:00 PM
  #35  
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What are you using to stiffen your wing? Are you using wood? What kind?
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Old 12-30-2018, 07:26 PM
  #36  
solentlife
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When it comes to stiffening a flying wing ... I approach from a different PoV than a conventional wing.

Conventional wing needs spanwise strength as the centre is supported by fuselage. So usually a single span wise spar is sufficient.

But a Flying wing often has cut-outs in its centre section and carries significant weight there along with motor thrust etc. This to me adds the requirement to stiffen up the centre to compensate for the weight, cut-outs and lack of fuselage.

Here is the TEKSUMO that Hobby King sell ... and if you look at it - you can see there is a short CF insert perpendicular to the centre joint line - this stiffens up the centre section. Then you see the V line of the two CF spars that provide the span stiffening.



Overall view if you look closely you can see the way it combines to stiffen ... and you can also see my U shaped balance piece ...



Balance point :



Nigel
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