Wright Stuff C

[jinhusong]

Initial turn is more determined by the propeller thrust offset (3 degrees to the left).

The warp is to keep the wing level while it is turning.

[coachchuckaahs]

When I built the kit I followed all the instructions on wing setup. I had left wing wash in on the main wing. Over time the wing has "warped" and now needs modification. On the main wing, both trailing edges are lower than the leading edges at the ends of the wing. I've messed around with the support struts but that doesn't do it. Is there a technique to "Re-warp" a wing? Could I slightly dampen the balsa, attach it to a form, and let it dry? Will that work or will it damage my wing?

The plane is still flying well except during the initial high torque take off. It wants to fly straight for a long way and then it starts to circle. It didn't do this before so I'm thinking it has to do with the wing changing shape a bit. Any ideas would be great.

Aircvo:

We have seen this sometimes with an over-flared prop on an otherwise good flying plane. Generally we have seen it with a very large prop with too much flare.

So, perhaps try a different prop for starters? Just to rule that out.

Then look over the plane carefully. If you see things that are "not to plan", you need to fix them. It sounds like you are indicating your TE is a banana, with both tips down more than the center section. This, coupled with uneven flexing due to flight loads (one side stiffer than the other), or twisting of the motor stick, could lead to what you are seeing. That torque is not very high, though. Is the TE carbon or wood? Of wood, carefully slit the TE near the center post, slicing with a razor blade almost lengthwise. So it is a diagonal slice that is very long, maybe a cm long or more. Then lift the outer tip of the TE into position, and hit the slice with a drop of glue. This gives a lot of glue area, and it will be strong.

IF the motor stick torques (twists) due to rubber load, then the left LE will go up (wash in) tending to reduce roll-in. However, if excessive, it could offset all the other factors trying to turn the plane. Be sure you have properly reinforced the motor stick. If your kit does not have reinforcement, you can add some carbon tow or strip to the top and bottom of the MS, rebuild with stiffer balsa, or add a little balsa doubler, especially between the two wing posts. If you are already at weight, the carbon may be your best bet.

So, I would:
1. Try a different prop (if using a stock prop, probably not the reason)
2. Remove wing warp issues
3. Stiffen motor stick in torsion

Coach Chuck

[Airco2020]

Thanks Coach Chuck!!

We were experimenting with higher pitch on the prop so I'll back that off and see if it helps.

The TE of the wing is carbon, any other ideas on getting ride of the banana as you described it?

[coachchuckaahs]

We switched to carbon two years ago to rid ourselves of warps.

I believe Dave used the same carbon we used last year, 0.039 x 0.019. I do not know how that would have warped. (I'm assuming a FFM kit).

You have it on edge, right? The larger dimension is vertical? It should be very resistant to warping in that direction.

Perhaps something is pulling it? Did you wrinkle your covering before applying it, and only stretch enough to get it on somewhat smoothly? If the carbon got VERY hot (soldering iron or heat gun) it could have warped, but probably you would have known that.

Short of replacing (or rebuilding wing), not sure what you can do. Perhaps judicious use of a heat gun, but will probably damage the covering before you help the warp.

Coach Chuck

[Rossyspsce]

we got 5th place cornell and we didn't use a flaring prop

From what I could tell most were using ff kits with standard props. Did see a couple senior kits and custom planes, but none were breaking the 2 minute mark. No Guru planes were seen. One interesting design included a ff body with senior wing and stab

[klastyioer]

we got 5th place cornell and we didn't use a flaring prop

From what I could tell most were using ff kits with standard props. Did see a couple senior kits and custom planes, but none were breaking the 2 minute mark. No Guru planes were seen. One interesting design included a ff body with senior wing and stab

i saw one plane that was like the senior kit but the tb was bent towards the ground and would flap a bit when climbing but it could get well over 2 mins in 18ft
i saw a guru kit and a laser cut kit, they were fine but couldnt get far past 1min
i also saw like 2 senior kits both w diff props, one never tested the other got over 1;30

[Rossyspsce]

we got 5th place cornell and we didn't use a flaring prop

From what I could tell most were using ff kits with standard props. Did see a couple senior kits and custom planes, but none were breaking the 2 minute mark. No Guru planes were seen. One interesting design included a ff body with senior wing and stab

i saw one plane that was like the senior kit but the tb was bent towards the ground and would flap a bit when climbing but it could get well over 2 mins in 18ft
i saw a guru kit and a laser cut kit, they were fine but couldnt get far past 1min
i also saw like 2 senior kits both w diff props, one never tested the other got over 1;30

you were at Cornell? What school?

[klastyioer]

From what I could tell most were using ff kits with standard props. Did see a couple senior kits and custom planes, but none were breaking the 2 minute mark. No Guru planes were seen. One interesting design included a ff body with senior wing and stab

i saw one plane that was like the senior kit but the tb was bent towards the ground and would flap a bit when climbing but it could get well over 2 mins in 18ft
i saw a guru kit and a laser cut kit, they were fine but couldnt get far past 1min
i also saw like 2 senior kits both w diff props, one never tested the other got over 1;30

you were at Cornell? What school?

no i was at soup
but im not gonna say my school...
idk what the schools i mentioned were i mean ik a few but im not revealing its their personal stuff too

[reldog]

Anyone have a picture of their airplane I can see? Can you tell me what was the highest placing you got with it? And can you also tell me if you got it from a kit and what design adjustments did you use? Thanks!

[klastyioer]

Anyone have a picture of their airplane I can see? Can you tell me what was the highest placing you got with it? And can you also tell me if you got it from a kit and what design adjustments did you use? Thanks!

we know this is u remy. people don't really send pics of their planes on here, but if you want personal help, you can pm me.