Involuntary Roll during loop
#1
Senior Member
Thread Starter
Join Date: Nov 2002
Location: Helsinki, FINLAND
Posts: 128
Likes: 0
Received 0 Likes
on
0 Posts
Involuntary Roll during loop
I have a new Extra 1.8m Wing with a .90 Super Tigre which I flew (maiden) last weekend that does a complete roll when the top part of the loop is reached (plane upside down at its lowest speed). The plane seems to stall ? and I have absolutely no control of it; but after the roll and when it gains a little speed its back in control again. What can it be ?? CG ?? Wing Balance ?? I am thinking of balancing the wing and pushing the CG a bit forward. I maybe thought it could be overcontrol of the elevators ?? Well lots of questions but not many answers this side. Any ideas on what can be done from someone who has gone through this before ?
Regards
Regards
#2
Senior Member
Join Date: Mar 2002
Location: Kingston,
ON, CANADA
Posts: 4,925
Likes: 0
Received 3 Likes
on
3 Posts
RE: Involuntary Roll during loop
Sounds like it's tipstalling from to much el. throw. Try doing a bigger loop without using full elevator. That will tell you if it's to much throw. Ideal is to back off the throw till it doesn't snap out.
#3
RE: Involuntary Roll during loop
snap roll -anyway you slice it -
Unfortunately, it is far too common on the BARFS of aerobatic models .
Sometimes, the model is underpowered and overweight- done to the manufacturer's recommended setup.
When the very first ARFS hit the US, this was the rule -not the exception.
Unfortunately, it is far too common on the BARFS of aerobatic models .
Sometimes, the model is underpowered and overweight- done to the manufacturer's recommended setup.
When the very first ARFS hit the US, this was the rule -not the exception.
#4
Member
Join Date: Jan 2003
Location: Laramie,
WY
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
RE: Involuntary Roll during loop
If you stall the aircraft inverted at the top of a loop it will snap roll upright. This is true for both full scale and models. Really leaves you wondering what the heck happened when you are sitting in the airplane. Make the loop smaller so you keep up the speed on the top side. Also back off the nose up pressure on the stick in the upper quarter of the loop then incrase it on the down side.