Flight Troubles?

goblue007
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Re: Flight Troubles?

Postby goblue007 » December 16th, 2009, 6:26 am

I doubt that the plane is to heavy it weight about 6 grams. We were using a .95 rubber band. Th H. Stablizer is 18.5cm and our wing span is 37cm. Our flight was about an 2/3 circle to 3/4. It tried to climb but couldn't. I thought it didn't have enough torque. We are only winding it 40 to 50 times with a 16:1 winder, so thats 640 to about 800. That could very easily be the problem. I then tried it with 960 rotations and it turn way to sharp and fliped over and flew upside down. It was not good we had to chase it as skimmed the ground to save it from wrecking the mylar. What do I do?
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carneyf1d
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Re: Flight Troubles?

Postby carneyf1d » December 16th, 2009, 9:09 pm

what kind of dihedral do you have on the wing?
and what do you mean by 2/3 or 3/4 circle?

goblue007
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Re: Flight Troubles?

Postby goblue007 » December 17th, 2009, 6:06 am

when we launch it it flies alone for the circle
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Re: Flight Troubles?

Postby jcollier » December 17th, 2009, 2:34 pm

I doubt that the plane is to heavy it weight about 6 grams. We were using a .95 rubber band. Th H. Stablizer is 18.5cm and our wing span is 37cm. Our flight was about an 2/3 circle to 3/4. It tried to climb but couldn't. I thought it didn't have enough torque. We are only winding it 40 to 50 times with a 16:1 winder, so thats 640 to about 800. That could very easily be the problem. I then tried it with 960 rotations and it turn way to sharp and fliped over and flew upside down. It was not good we had to chase it as skimmed the ground to save it from wrecking the mylar. What do I do?
Sounds like if you wind it harder, it flies worse. If that is true, it could be the motor stick bending. You should be able to raise the leading edge of the wing to get it to lift. If it doesn't lift with .095, it is not because of too little torque. We usually do trim flights with 600 winds, and a good plane will fly for 1:15-1:30 and climb to 15 ft. high or more.

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Re: Flight Troubles?

Postby jander14indoor » December 18th, 2009, 10:40 am

I doubt that the plane is to heavy it weight about 6 grams. We were using a .95 rubber band. Th H. Stablizer is 18.5cm and our wing span is 37cm. Our flight was about an 2/3 circle to 3/4. It tried to climb but couldn't. I thought it didn't have enough torque. We are only winding it 40 to 50 times with a 16:1 winder, so thats 640 to about 800. That could very easily be the problem. I then tried it with 960 rotations and it turn way to sharp and fliped over and flew upside down. It was not good we had to chase it as skimmed the ground to save it from wrecking the mylar. What do I do?
Yep, weight is OK. Assuming conventional configuration it should fly.

Definitely needs more turns, but sudden changes in behavior point to other things being wrong too.

Weak motor stick already mentioned, equally a weak prop hanger. But typically that causes a dive, not a roll over.

Increased torque could have flipped it over with more winds, but you didn't increase that much. Did it fly OK when you went back to less winds? If not, look for something broken. If yes, something is bending.

If the Motor stick is stout enough, try to watch the plane carefully in flight as you increase torque. I once had a plane that would fly great in low sites, but when I increased torque in taller sites to get to the ceiling the thing would roll into the ground. It was almost an on-off behavior, small changes in torque flipped the plane over the edge. Took forever to figure it out till was able to see things right. I had a weak front spar on the tail and above a certain torque (speed) the stab would suddenly twist the LE up on one side, rolling and diving to the ground. A weak front spar on the wing can cause similar things. For this, and other reasons (flutter if you want to look it up), its best to have a slightly stiffer front spar than a rear.

And yes, make sure you have enough dihedral.

Jeff Anderson
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hoping to get home for the holidays to:
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Well, more details would be useful. Its hard to give help with so few facts.
How much does the plane weigh. How big is it. How much rubber are you using, what kind? How hard are you winding the motor. How long does it circle without climbing. Please describe a flight in detail.

That said, here's the couple of big generic things I've seen over the years preventing good flights.
Plane is just too heavy. Sorry, only solution to that is to build a lighter plane.
Not winding the motor hard enough! Even with a properly built and trimmed plane it takes 1200 plus turns on a 3/32 wide 1.5 gm motor to fly good SO planes to these rules. WIND those motors.
If your plane is light, you are winding the motors hard, and are getting nice level, but not climbing flight, increase the angle of attack by tipping the leading edge of the wing up or trailing edge of the rear stab up. Make small changes.

Get back to us with details for your flights and we can be more helpful.

Jeff Anderson
still in Oakville, ON, Canada
but looking more like I'll get home for the holidays to:
Livonia, MI

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Re: Flight Troubles?

Postby goblue007 » December 20th, 2009, 9:54 am

I doubt that the plane is to heavy it weight about 6 grams. We were using a .95 rubber band. Th H. Stablizer is 18.5cm and our wing span is 37cm. Our flight was about an 2/3 circle to 3/4. It tried to climb but couldn't. In addition it turns left then turns to much and flips and dives. The tail is loose meaning it twists possible durng flight could that possibly have a huge impact on the overall flight?
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Re: Flight Troubles?

Postby goblue007 » December 30th, 2009, 6:00 am

Once again, we flew for another hour or two. The plane will "try" to climb, but it always turns starts to turn to soon. We are trying to figure it out and we are really struggled with the hole. idea. Could we adjust the horizontal stabilizer to prevent this from happening?
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Re: Flight Troubles?

Postby Hamtown009 » December 30th, 2009, 6:35 am

What designs do you like? Which ones work? Can you please put a link or a website on here for us to begin building our second plane? Thanks
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Re: Flight Troubles?

Postby jcollier » December 31st, 2009, 6:28 pm

To answer your question, yes, the horizontal stabilizer could be tipped too much, causing too much of a turn. The fact that it is loose is something that you should take care of. It is difficult if not impossible to make successful adjustments when something important is loose.

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Re: Flight Troubles?

Postby planemaker » January 1st, 2010, 6:20 pm

Hi everybody I'm new to the Wright stuff scene and i bought a kit from Freedom Flight Models. hhttp://www.freedomflightmodels.com/paypal.htm

I want to know how good(or bad) this kit is?
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Re: Flight Troubles?

Postby Greg Doe » January 1st, 2010, 8:27 pm

I have a lot of confidence in all of the Freedom Flight products. This years WS airplane is based on
last years nationals winning airplane, with 2010 rules changes incorporated. I have every reason to
believe that this kit will produce 3 minute flights in 30 foot gyms, and close to 4 minutes in 70 foot
venues (such as the Illinois State field house). I coach, but I also fly the same designs that my
students fly, in order to learn the airplanes flight characteristics. All of the kits that are available
are good. Which one is best is hard to determine. Obviously, a good design that is poorly built,
will not fly as well as poor design that is properly built. Read and follow the instructions. Build the airplane as carefully as you can. Trim the airplane for flight, as close to the instructions as you can.
If you are having flight problems ask for help. Try to find someone locally who has indoor free
flight experience, or post your questions here. Good Luck, and let us know how successful you were.
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Hamtown009
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Re: Flight Troubles?

Postby Hamtown009 » January 3rd, 2010, 4:30 pm

We've already built one plane so far this year and it hasn't been able to fly well, we now realize that the motor stick is bending. We are going to start a new plane tomorrow. We are thinking of using the plane that is on the freedom flight models website but we don't know for sure. Would you recommend that design (the new 2010 one)? Good luck to you all in your flights ahead.
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Re: Flight Troubles?

Postby Greg Doe » January 3rd, 2010, 7:43 pm

Hamtown,
Starting over can be time consuming. First try to salvage your airplane. Try gluing a strip of wood
along the top of your motor stick to stiffen it up. Even if it picks up a little weight you can still learn a lot from the experience. I've only built one complete "proto-type" airplane this year, but I have
built a second stablizer, and a third wing for that airplane. The fuselage has the same problem as yours, and needs to be fixed, but it's good enough to use as a practice airplane. If I were to build a second airplane it would include all the modifications and improvements. My students will also benefit
from this research. Building from any kit has the benefit that the designer has already gone through
this developement process, and probably has years of experience to draw upon when designing his
airplane. Read my previous post about the capability of the Freedom Flight design. I like it, but
all the designs, and kits I have seen look good, and properly built could be winners. Good luck, and keep us posted on how things work out.
Greg Doe
Smyrna, TN

shorti96
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Re: Flight Troubles?

Postby shorti96 » January 7th, 2010, 12:44 pm

hey does anyone know how to trim a wright stuff airplane propeller
because i cant seem to find out how???
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eta150
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Re: Flight Troubles?

Postby eta150 » January 7th, 2010, 12:59 pm

The prop is flexible enough, so a razor will work just fine.
That is, if it's Ikara (which it probably should be).
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