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Old Feb 06, 2013, 02:50 PM
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Video

A319 scale flaps and spoilers


hi all
thought id post some videos of the work so far on my A319 jet
id welcome your thoughts
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Old Feb 06, 2013, 03:15 PM
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Pretty crazy cool looking, love the hinging out and down, then the up and in, what is the wingspan going to be, it looks like it may be heavy.
Old Feb 06, 2013, 03:18 PM
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wingspan is 2.5m and yes its not light i have not weighed it yet i dont think i want too!
Old Feb 06, 2013, 03:20 PM
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Quote:
Originally Posted by madaboutjets View Post
wingspan is 2.5m and yes its not light i have not weighed it yet i dont think i want too!
Looks simply amazing Sir! I would weigh it, that way you'll know what kind of power you will need to get her airborne & also determine how long her takeoff run will be.
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Old Feb 06, 2013, 03:49 PM
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cheers demon!
yes i will weigh it once the other wing is complete along with the landing gear its my first scale project so a lot of things are still in experimentation!
Old Feb 06, 2013, 05:38 PM
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Nice work.
Old Feb 06, 2013, 05:49 PM
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HD FPV on a 4m glider
thats amazing
Old Feb 06, 2013, 06:38 PM
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VERY cool, but you already knew that. Question; are you going to combine use of the flaps and spoilers w/ the ailerons for roll authority? I'm thinking you might need to in order to control an expected heavy model. Although I'm not sure how you would do that. I believe that real airliners do this but for example the spoilers move at a much smaller amount than the aileron defection so not to create too much drag during roll. One idea to reduce some weight is to connect the four outer spoilers together using .10 mil mylar on the back side of them so you can reduce the number of servos per wing half by three.
Old Feb 06, 2013, 10:18 PM
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Impressive fabrication. Now I need to figure out a way to do that in foam at half the size and a quarter of the weight.

Thanks for sharing that, I'm inspired.
Cheers
Joe
Old Feb 06, 2013, 11:28 PM
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Great Job man, Looks unbeleivable
Old Feb 07, 2013, 12:10 AM
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WOW very impressive!!!! It really doesn't look too heavy too me, two 40hp motors should work (JK). Very nice design, to lighten it, if it is really too heavy, could you make the hinging out of plastic or CF?

John
Old Feb 07, 2013, 03:11 AM
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On the full size aircraft roll is controlled with the outer 4 spoilers how much I'm not sure yet but max deflection for the spoilers is 35degrees according to the manual obviously that would be way too much as it would just kill the lift that's only used on the ground when the inner flap is also actuated
Yes I'm tempted to bind the four spoilers together to save on weight and complexity !
Also on the full size the ailerons droop 5degrees when full flap is deployed this shouldn't be a problem if I can get the right gear
Old Feb 07, 2013, 03:14 AM
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Using plastic for the mechanism would have been possible except for the main linkage which is bent to fit on the end of the flap bracket
Old Feb 07, 2013, 05:13 AM
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Quote:
Originally Posted by madaboutjets View Post
On the full size aircraft roll is controlled with the outer 4 spoilers how much I'm not sure yet but max deflection for the spoilers is 35degrees according to the manual obviously that would be way too much as it would just kill the lift that's only used on the ground when the inner flap is also actuated
Yes I'm tempted to bind the four spoilers together to save on weight and complexity !
Also on the full size the ailerons droop 5degrees when full flap is deployed this shouldn't be a problem if I can get the right gear
Now that I think about it more, it should be possible to link the outer four spoilers (o4s) to the ailerons and have them deflect at a lesser amount than the ailerons. You said the roll is controlled by the o4s, but I would think that so do the ailerons. Anyway, if you connect the o4s together, use one servo for them, y-harness them and put them in a rx ch, then do a prog mix and slave the o4s to the ailerons and 30% or so for up and zero for down. What do you think?
Old Feb 07, 2013, 05:56 AM
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Yes your right forgot to mention ailerons for roll of course!
That's a good idea not sure if connecting the spoilers and aileron with a y harness would work as I'm planning on using the spoilers for ground brakes as full size


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