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        Video A319 scale flaps and spoilers

#1 madaboutjets Feb 06, 2013 01:50 PM

A319 scale flaps and spoilers
 
3 Attachment(s)
hi all
thought id post some videos of the work so far on my A319 jet
id welcome your thoughts

#2 Hollywood2979 Feb 06, 2013 02:15 PM

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.

#3 madaboutjets Feb 06, 2013 02:18 PM

wingspan is 2.5m and yes its not light i have not weighed it yet i dont think i want too!

#4 demondriver Feb 06, 2013 02:20 PM

Quote:

Originally Posted by madaboutjets (Post 24053602)
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!:D 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.

#5 madaboutjets Feb 06, 2013 02:49 PM

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!

#6 Rookie2008 Feb 06, 2013 04:38 PM

Nice work.

#7 redodedo Feb 06, 2013 04:49 PM

thats amazing

#8 fly2bob Feb 06, 2013 05:38 PM

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.

#9 jmpdgs Feb 06, 2013 09:18 PM

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

#10 joegermano1 Feb 06, 2013 10:28 PM

Great Job man, Looks unbeleivable

#11 badpilotto Feb 06, 2013 11:10 PM

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

#12 madaboutjets Feb 07, 2013 02:11 AM

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

#13 madaboutjets Feb 07, 2013 02:14 AM

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

#14 fly2bob Feb 07, 2013 04:13 AM

Quote:

Originally Posted by madaboutjets (Post 24059170)
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?

#15 madaboutjets Feb 07, 2013 04:56 AM

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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