VTOL Test #2 in The Yard

[ymi2b]

get rid of the nacelle, you'll get far more lift & stability without it around the propeller.

[outofcomms]

It appears to be top heavy. You need to move your center of mass down, plus you may also be getting ground effect from your thrust.

[MagicalPonyFromMars]

By all of your videos, I just imagine a little room full of all of your rc builds...lol Do you keep them all?

[Overdosedd1225]

inherently stable in hover or climb. but with when descending it loses the trust keeping it upright like a pendulum and therefore goes into a wobble patter. cool video though

[henshooten]

the circling tells me its top end heavy when decelerating IMHO

[daceknerr]

if you look at military drones that use this configuration youll notice the prop is inside the drum and the inlet is curved out like the leading edge of a wing, this creates extra lift as teh air is sucked in and over the inlet into the barrel. may be something to play with, it will also move your center of pressure slightly higher above your mass. the decent problem i feel is more an turbulent inlet issue than control surface issue. you need nice smooth air from the top for control below...

[Kjetilaf]

if you had removed that barrel around it, maybe it would be easier to control when it is coming down?

[hallobaaaby]

I think it's stable when going up because it has a nice stream of compressed air that supports it--it's actually the only thing that supports it (no wings). So when it's going down, the throttle is weaker, thus the air is less compressed, thus the contraption has less stability support. If to make it go down you could put inside some tubes that would simply simetrically redirect the air sidewise instead of straight down (without cutting on throttle) then it'd prolly go down while staying stable.

[ufoengines]

That look like a lot of fun. Maybe if you hooked a gyro on to the control vains some how. Or maybe antiservo tabs with counter weights in the controll vains to slow up the pitch over.

[jekasiv]

гравицапа. ку

[201wrestler]

you need a tail rotor. every action there is an equal an opposite reaction

[rctestflight]

@201wrestler no, it already has yaw control

[sniperkid90]

@201wrestler Yes but you have to remeber it cannot effect the flight pattern because  the tourque is internal and a law of motion is nothing can move unless it is acted upon by a outside force. The motor is inside the aircraft.

[FunCamTV]

Try to place the weight in the bottom...

[SvenOkonomi]

Give this one another shot using a KKboard. ;) High chance of success.

[77wimmut]

It's weather vaning on the way up. On the way down your control surfaces are steering sort of leading the way they are set. Those control surfaces need to be in the center position, The steering effect is more pronounced on the way down. That's why it turns on the descent and becomes unstable.

[SVTIII]

Unknown flying bucket

[unclesara]

Decending through your own dirty prop/rotor wash combined with reduced control surface effectiveness at reduced throttle is the problem.

[LTF85199]

Ground effect s and flow turbulence when you get close to the ground,, slow throttling down may help.. but no good solution for the turbulence. part.

[hhsphotography]

Looking good. Have you considered two motors, with props oriented to they rotate in opposite directions.. to kill the torque effect?

[rctestflight]

ya but i am having no problems with torque roll, the gyro holds it pretty still

[sheldonholy]

As mentioned before, it's a mixture of going back down through the rough prop wash and the ground effect. Put the battery further down with more power.

Sheldon

[j6sj7]

So cool, Daniel. Five stars.

[bnrusso]

I also wonder how it would work with 1 gyro for left/ right 1 gyro for front/back and 1 gyro for rotation.

[rctestflight]

It has one gyro for every axis, roll(rotation), yaw(left,right) and pitch(front back)

[bnrusso]

look at your shots at 2:35 and 2:40.

I'm concerned that your gyros or your stick movement are not moving your surfaces equally. If one surfaces moves without the other it will cause that bad pitch. Great job.

[rctestflight]

thats because I have it trimed for roll and pitch.

[RCllamadude]

@rctestflight the problem with being unstable on the way down might be because when air hits the control surface from the bottom rather than from above where the prop is you get opposite controls, so gyros would correct for say, forward pitch, but they would be tilting it further forward rather than correcting it. therefore the gyros make it less stable while descending.

[ThrustRC]

Lookds good!

[RCTestPilots]

Oh veeery nice!

[FlyHighRC386]

when it goes down i think its because its going back into its prop wash so in esanse flying into turbulance 5*

[RCSuperPowers]

Wow dude really good!

[wildhover]

looks like the same wobble my fixed pitch heli's had when descending. Throttling up get's rid of the wobble, but then you can't land if your aircraft is going back up. My collective pitch heli does not have the wobble because the rotor speed does not decrease when dropping elevation. you loose the gyro effect of your spinning prop during landings with your current setup but a collective pitch setup would be outrageously heavy and complex. nice work man. you will have your hands full with this 1

[rctestflight]

Hi, my blade cx2 did the same thing, i will just have to descend slower.

dan

[wildhover]

that was a great solution to the problem. it didn't require any extra work and it was a free fix to the wobbling. LOL

[Didgeman80]

SWEET! It's coming along! Keep it up!

[sloshays]

Nice! I love all of the projects that you have going! I love the diversity of planes that you fly and the short to the point videos that you make! You are my favorite rc youtuber! 5*

[Skydive4ever]

That alone is pretty cool :-)

[cyberteque]

Thats looking good!

You should get the prop totally enclosed, the tip vtex of each blade of the prop could be interacting with outside of the "fuselage", if you get the prop down, totally enclosed you will get more thrust.

The other thing you should try is to make a kind of diffuser, a bit like thin fins radially, just under the motor, take the swirl out of the air as it passes through the fuselage.

[rctestflight]

Ya I have a little bit of the diffuser thing right under the motor, I will try and inclose the prop.

dan

[tma450]

wow u r right on track good work