[saerog]

Hello, I am flying Moyes XS 155 at the moment. Few times in the past I got some very bad behavior from a hangglider.

First time I felt it: I aerotowed as usual, after half circle in the thermal I got pretty strong force into speed bar from the front, so I had to keep speedbar pushing forward till the ground. I flew before a storm come in. I suspect it could be a weather that influences this actions. After, we checked all glider and found nothing. So I tried to tow up in the evening calm conditions everything looked normal

Today I did thermal up to the cloud base and started glide to another cloud. Sky looked strange, stormy little bit. So I got again that hard and long push from the front, then I tried to release the bar and look where speedbar will go, so the bar were under my belly. But there were no big sink and even in a lift I got this behavior, some time after I flew to my home everything went to normal again. I tried to push full speed, everything looked okay.

So my question is: have you ever experienced this? Do you think it is induced by weather or technical issues?

Thanks in advance, Saulius

[jjcote]

I do not think that weather could cause this.

Are you sure that the nose cone was in place properly? The one time I experienced something similar to this (and it happened intermittently during the flight), my nose cone had fallen off before I launched.

[saerog]

I secure nose cone with tape It's strange, I think I will stop flying that wing and make whole review

[dave hopkins]

You stated the weather looked stormy. But I'm asuming there was no rain or moisture present.? Gliders with mylar leading edges can have simular experiences if the mylar gets wet.

Dave

[blindrodie]

It sounds to me like your hang strap is moving forward and then back while you are flying. As in your CG is changing as you fly!!!

Are you sure that your hang strap is secured to the keel?

[saerog]

There was some moisture in the air, but not a rain. Now my hang point is in the most forward position, so now it flies fastest, I don't think cg can move by itself ( i will check for that anyway) thanks

[Fletcher]

I have an old Icaro Laminar ST that flys strange like that.
I suspect the sail has shrunk and is causing the glider to be out of trim.
Very difficult to land this way
Hope you get it figured out

[Paul H]

Another thing to check would be the rib profiles.

[Jason]

or folded mylar.........

[Dan Harding]

One of the Gliders I fly is a "MOYES SX6" I find that it thermals well and has no characteristics that is abnormal, I have flown it with the VG in full off to full on and it flys the way one would expect.

[Mavi Gogun]

[saerog]

[saerog]

[st1lgar]

[klh]

It sounds like moisture collecting on the leading edge and disrupting the airflow.

[saerog]

[aeroexperiments]

You say your securing your nosecone with wide tape. Are you sure it is staying 100% adhered to the wing?

A friend of mine had a glider want to roll and dive because of tape. He had a long strip of tape covering a delaminating area running along the leading edge. Well, the delamination caused the tape to come loose along the bottom edge while staying stuck tight on the top edge and the ends. This created a long, narrow, downward-opening pocket that was perfect for spoiling the airflow over the top of the wing behind the tape. The tape was well inboard so the loss of lift made the glider want to dive, but far enough out from the centerline that it wanted to roll as well.

This all happened in the landing pattern and the result was a nasty bonk, he sort of just dove into the ground in a steep bank.

Steve

[saerog]

Yes I noticed that there were some spaces between leading edge and nose cone. Moreover top part of nose cone was detached in the back. So wing profile was wrong in the center. Yesterday I test flew a glider everything seemed normal again . Thanks for your answers, I believe that these problems occurred because of bad fitted nose cone.