Foof,

1 1/16 Probably wont matter, but you can probably lose that 'teenth when you cover the wing!

It might make the eventual tipstall predicable... It would always go to the right!! though I really don't think tipstall is in this models vocab.

Regards,

Steve

This is the finished sheeted wing though, all I need to do is add the 3/8 wood to join the aileron to it, maybe I can loose it there when I attach that.

1\16" of an inch on a panel of a 2 metre span model!

That's .09 of 1 degree

Get a grip Foof You need help but not with the wing

I remember models that used to have 2 degrees of washout LOL

Sorry baron I forgot to take my dutonin this morning.

Well I havent managed a tip stall yet, so it beats the C50, even though mine is quite heavy. I have tried to tip stall it, to see how bad it is, and at what point it comes in, but from level flight it just mushes, then goes into an elevator, and vertical dive it either pulls out or does a parachute. There does not seem to be an inbetween . Only trouble is wing rock in harriers.

Foof, I'm quite impressed that you can measure an inaccuracy of that amount, don't think I could. If you are really bothered, carefull use of the iron when covering it could probably eliminate that small amount of difference.

Sprink we should compare setups because i am not getting any wing rock in harriers at all.

I echo your thoughts with the tipstall though- if you try to get it to do it the plane acts confused and doesnt understand wether you want a normal pullout or an elevator

Definately should not have wing rock in the harrier or the elevator... either a set up issue or you are trying too hard...

C140 does not tip stall in conventional way... you can force oneat zero speed by applying the elev slowly up to full and introducing a little rudder - as you would for spin entry...

Hello!
What do you think about this as a DIY Hide mount?
http://home.online.no/~ofremmi/HowTo.../HydeMount.htm
I think I will give it a try for my Capiche!

I think it's an interesting question how much error you should accept when building a big airplane, for example how much error is ok for the wing ends to the tail?

I allways have the highest ambitions when starting a build but ends up with a couple of millimeters here and there as errors..[:@]

Mikael

sounds nose heavy sprink, that would make it wing rock, stick a few oz on the back, that will sort it. (will also land hands off with its tail hanging down )

I think it is more a weight issue than CG, bearly needs the elevator to be breathed on when inverted, but will check with Luke as he says.

Hey Norman,i dont have any trouble with the harriers its just the rolling harriers.

Adam

umm i only have to squeeze up when inverted i dont think it is a weight issue, i just put my old 140 on the scales and it was 12,1/4 pounds !! (has been repaird a lott and has a realy heavy cowl) and that stil harriers and elivators perfect and its a fair bit nose hevier than my electric one. Check the ailerons are not both drooping a bit (bit hard to see but worth checking) as it makes a big diference as does lateral ballance with the plane always falling one side and you having to pick it up will lead into wing wobble

Dave

Nothing to indicate lack of lateral balance. Will check the aileron setting. Elevators are rock solid, it is just the harrier that rocks.

Could be that because ive really made sure that my ails are absolutely not drooping

but why would they drop.

If you set up your linkage wrong so that the ails are angled down slightly

What causes wing rocking, I've been asked to put my C140 in the uni wind tunel when it is finsished to test stall flying. ANy other thing you think I could test.

That would be VERY interesting to wind tunnel test it. Your uni wind tunnel must be HHHUUUUGE though to fit a 140ex in!!

it's goes up to 12ft - used to test wind turbines you see.

Could be interesting

As for wing rock, when in an elevator or harrier, the wing is stalled. Therefore the airflow over the top of the wing is unstable, and I suspect the wing relies on high preasure under the wing (rather than low preasure over the wing) to generate lift.

I suspect that wing rock is caused by changes in the instability of the air over the top of the wing (if that makes any sense), perhaps partly unstalling itself to create extra lift.

If you are putting it in a wind tunnel, perhaps you can tell us what the answer is

What about Knife Edge stuff? Also what about the torque needed by the servo for large deflections on all the surfaces, using different Servo arm to control horn ratios. Try at small deflections (eg 10 or 12 degrees) aswell as large. This sounds bossy, but don't mean to be, just thought would be interesting. Obviously if ya can't do it don't worry. Just some suggestions.
Robert.

I reckon wing rocking is also partly caused by the pressure under the wing spilling, but would be very interesting to see what actually happens.

I would be very interested in KE coupling though. see what actually makes it happen and if the capiche can be improved.

Getting better, be able to see if we really need such high torque servo's and what can be done to improve the knife egde capabilities of the plane. I like the sound of that one.

how are you going to mount it in the wind tunnel?

dunno, we have a special aerofoil shape mount, but don't know how I am going to attach it to the fuse yet. WIll see what the technicians come up with.