flyboybuster

just a few quick questions:

Can you take a wing from one plane, and put it on another with a shorter arm to the elevator?

And if you can, will the CG of the wing change or remain the same?

Do you need more deflection on the elevator and rudder due to the shorter arm?




The only example I can think of would be:
Take a Cessna 150 and put a wing to a Cessna 172 on it.........

Jimmbbo

It can be done, but you may introduce a number of variables that affect the stability, control and balance of the airplane...

At the risk of oversimplifying the challenge, each airfoil cross section has particular lift, drag and pitching (moment) characteristics. If the airfoils are similar in shape and size (say swapping a 9% thick for a 11% thick section of the same airfoil, you could probably do so without much harm.

If the airfoil sections are significantly different (say a 18% thick Clark Y high lift, high drag, low speed section) vs a 12% 23-012 section (high speed, low drag)), the wing will behave differently, and require refiguring the incidence angles of wing and horizontal stabilizer, as well as looking at the stabilizer and elevator size, location and the location of the wing on the fuselage...

If you have a lot of patience and an unending supply of wings, would make an interesting research project ... OTW, wouldn't recommend it...

Cheers!

Jim

flyboybuster

Thanks for the input....

What I'm doing is taking a wing from a GP patriot, scaling it down, and putting it onto another plane with a horizontal stab that is closer to the wing than the patriot has.


PS....rule 3... the captain is right because the FO told him the answer

Tall Paul

I swap wings all the time.
Nothing much happens.
Even putting one on backwards.. the first photo

beepee

Swap away. Maintain the CG of the wing used.

Have fun!

Bedford

Gremlin Castle

My Feedback: (14)

If the wings are basically constant chord and the incidence remains the same wing swapping is no big deal.

Years back another fellow and I were doing beta testing for aristocraft. In the course of testing we actually managed to destroy the wing of a US Aircore trainer. We went to a local pawn and hobby shop and picked up 4 wings in the approximate size of the Aircore wing and went on with the testing.

flyboybuster

wow....that backwards wing shocked me.[X(]....that must have really produced alot of drag.........

I appreciate all the support on swapping wings, but will a shorter arm of about 4-6 inches to the elavator really make a big difference to pitch??????????

Thanks
chris

beepee

Yes, it will be much more pitch sensitive. Tone down the elevator range of deflection and you are back in business.

Bedford

Tall Paul

The backwards really flies no differently.. it's a little sensitive to pitch but that's all. For planes that size all that really matters is there's a curve on the top. Where the curve peaks.. airplane don't care.
It's just one of those things you can do to annoy people who annoy you.. When they notice the wing is on backwards, just say you haven't got time to change it, and go fly!
when it was put on upside down! and backwards, THAT was a problem, as the anhedral reverses the rudder.

canadagoose

My Feedback: (2)

Have you tried mounting an aileron wing backwards yet?

flyboybuster

Bedford..........Thanks for the tip!!!

Tall Paul......Love the annoying comment....I was thinking the same thing as canadagoose....."dare you to put ailerons on it"... I remember an experiment at the smithsonian about wing design.......they had 1. the correct direction and 2. the oppositte like yours. The experiment showed how turbulant the airflow was when it came off the wing that was backwards. The airflow circulated around the TE. I'm surprise that yours was so stable.

flyboybuster

I'll post a pic of the plane I'm building as soon as I can take one.....it's an EMB135 regional jet, will a pusher prop

Tall Paul

Backwards wing Fun-Fly competitions aren't that rare. It's really no big deal in model sizes.

flyboybuster

Here what I'm slapping the Patriot wing on.........

Tall Paul

.
I've thought about it.. but I'm content to let someone else expand that envelope.