bobmaster

I need to repair a main wing of my f-4 that have been epoxied. How I can do that,....
Here is a safe way to remove the wing and the solid epoxy from the foam.
I do i need to proceed to replace this wing ???

sim

opjose

If the wing is broken, put the pieces back together with white or any foam safe glue.

Don't worry about the looks initially.

Once the wing holds together, fill the cracks with a mixture of microballoons and epoxy.

Once dry sand this to the original shape of the wing, and paint.

This is much easier than trying to remove the existing wing.

If the damage is more extensive, you MAY be able to obtain a replacement wing, then cut the existing one carefully and squarely.

Cut the replacement in EXACTLY the same way and glue the good wing portion back... then microballoons/epoxy, sand and paint.

Once a wing has been epoxied on, the glue adheres far stronger than the foam itself... so no there is no way to remove it, you must work around the break as above.

This is pretty standard stuff for foam.

BTW:

I prefer BALSA for ease of repairs.

Once you learn a little bit about covering and how to join and shape balsa ( which is VERY easy ), the repairs on balsa planes are impossible to tell from the original. And no painting is required... covering is much easier to repair and apply.

The "big boys" tout foam as being easier to repair... yeah right... try fixing a collapsed nose or something similiar...

bobmaster

Thanks to the reply ,...
I want to repair the wing because ,,,,when you look at the back of the plane,....the right wing it just a few mm(about 3) down.......i mean when you look at the wing they are suppose to be perfectly at 90 degres whit the bottom.....
if the right main wing have a little bigger angle than 90 degree do it will affect the flight path

sim

opjose

For a 3MM difference?

Don't bother!

Just adjust the aileron instead...

If one wing is further down by about 3MM at the rear, then adjust the aileron linkage so that the trailing edge of that aileron is about 1-2 MM up.

This will ofset the slight problem with the wing.... though I even doubt you need to do this...

The only drawback to the above is that you will get an almost imperceptible difference in the amount of drag on each wing... but the difference you have is so slight that it would never be noticible...

Remember that to prevent the plane from rolling you offset the aileron trims to the right far more than this!

bobmaster

Thanks,

I was thinking that 3mm would make a huge difference but it seems not.

Can you tell me what time is it in your countrie, ....

opjose

We are both on Eastern ( GMT - 5hr ) time.