Help! why is my plane pitching up as soon as i throw
- Thread starter Ramsey
- Start date
quorneng
Master member
Ramsey
It would help if you explain what plane it is (or a picture) its size and if powered but almost certainly you have the balance point wrong, however that statement assumes you have built/assembled the plane correctly in the first place!
Any plane has a point where the wing lift is considered to act. If its balance point (if should be given on the plan) is behind the centre of lift it will climb severely, slow down, the wing stops creating any lift and the nose drops just as you describe. If you are actually high enough it will recover and go trough the same nose up/down routine loosing height each time until the ground gets in the way.
If you do not know the correct balance point all you can do is to move the balance forward a bit (add nose weight) and try again. It may take several adjustments before the plane stops the unwanted immediate climb.
Be aware if you add too much nose weight the plane will simply dive into the ground.
It takes some experience to setup and trim a plane to fly well. If at all possible the easiest way is to get an experienced flyer is to look over your plane and ideally do the initial flight check.
It would help if you explain what plane it is (or a picture) its size and if powered but almost certainly you have the balance point wrong, however that statement assumes you have built/assembled the plane correctly in the first place!
Any plane has a point where the wing lift is considered to act. If its balance point (if should be given on the plan) is behind the centre of lift it will climb severely, slow down, the wing stops creating any lift and the nose drops just as you describe. If you are actually high enough it will recover and go trough the same nose up/down routine loosing height each time until the ground gets in the way.
If you do not know the correct balance point all you can do is to move the balance forward a bit (add nose weight) and try again. It may take several adjustments before the plane stops the unwanted immediate climb.
Be aware if you add too much nose weight the plane will simply dive into the ground.
It takes some experience to setup and trim a plane to fly well. If at all possible the easiest way is to get an experienced flyer is to look over your plane and ideally do the initial flight check.
It definitely could be a balance point issue, also known as CG, also known as tail heavy.
But your CG could be correct & maybe the plane has too much up elevator, it just needs to be trimed out.
What was the plane built from plans? A known plane is far easier to troubleshoot.
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Launching at full throttle can contribute to that also.
Been there, done that, easy to do on your first plane or two. Most launch at 60% -75% throttle.
What's happening?
quorneng
Master member
Electric power has a lot of variables.
"its a 2200" to what does that refer? The mAh capacity of the battery or the kV of the motor?
It all depends on the plane's weight but a 6x4 prop on 7.2v can be quite adequate.
I have five planes that use a 6x4 on a 2s LiPo and they fly really well but they are light for their size, like this home designed Super Cub.
6x4 prop. 40" span and ready to go with a 1000mAh 2s LiPo it weighs 8.5oz (242g).
"its a 2200" to what does that refer? The mAh capacity of the battery or the kV of the motor?
It all depends on the plane's weight but a 6x4 prop on 7.2v can be quite adequate.
I have five planes that use a 6x4 on a 2s LiPo and they fly really well but they are light for their size, like this home designed Super Cub.
6x4 prop. 40" span and ready to go with a 1000mAh 2s LiPo it weighs 8.5oz (242g).
mine has a 6x4 77cm wingspan with 1600 mah 2s lipo and 40 amp esc i do not have the wieght
Piotrsko
Legendary member
Using "typicals" it is a 22mm (.8 " american) outside measurement motor can, not including the mounting system, but generally there are secondary numbers which in your case is 00 and is useless without the data sheet to translate.
Like others, I have questions about the plane, CG and trims. Could be an agressive stall, not enough thrust, stuff not in alignment, twitchy controls.or even pilot error
Like others, I have questions about the plane, CG and trims. Could be an agressive stall, not enough thrust, stuff not in alignment, twitchy controls.or even pilot error
Mr Man
Mr SPEED!
I’m guessing you’re talking about the KV, but that’s not the only thing that matters on the motor, there is also the size of the bell and/or stator. I’m just going to guess you have a 2212 2200kv motor, which probably doesn’t have enough power for how much your plane weighs (I’m guessing it weighs a fair amount). So I’d recommend getting a lighter 3s lipo battery, as long as the plane still balanced.
Foamforce
Elite member
Yeah, almost certainly this one.
Adding to what everyone else said, that’s a high speed/low torque motor. By itself, that’s already a poor combination for a trainer, but it might work if it were in 3s. At 2s it will be very difficult. The 1000kv version of the same motor, at 3s with a 9-10” prop, is a much better choice.
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Adding to what everyone else said, that’s a high speed/low torque motor. By itself, that’s already a poor combination for a trainer, but it might work if it were in 3s. At 2s it will be very difficult. The 1000kv version of the same motor, at 3s with a 9-10” prop, is a much better choice.
quorneng
Master member
If it is indeed under powered but still still goes immediately into a steep climb followed by a nose plant then the plane is seriously out of adjustment and the last thing you need now is more power as it will only make things worse!
If it flies just about but won't climb only then do you need to consider more power.
At 77mm span it is not exactly large so its weight plays a very important part in how much power it needs to fly and as Mr Man suggests even a 1500mAh 2s LiPo is a heavy lump.
If it flies just about but won't climb only then do you need to consider more power.
At 77mm span it is not exactly large so its weight plays a very important part in how much power it needs to fly and as Mr Man suggests even a 1500mAh 2s LiPo is a heavy lump.
Mr Man
Mr SPEED!
Don’t forget to also get a bigger prop 👍
