EZ Power Pack Pizza Box

[BadAir]

So, I thought it was the CG and we messed around with it for a long while.

My new idea is that the motors are too near the edge and are twisting when power is applied. Launched at quarter throttle is flys perfectly straight, just losses altitude. Any more throttle or differential and stuff gets weird.

 

[Foamforce]

So, I thought it was the CG and we messed around with it for a long while.

My new idea is that the motors are too near the edge and are twisting when power is applied. Launched at quarter throttle is flys perfectly straight, just losses altitude. Any more throttle or differential and stuff gets weird.

Weird how?

The board appears to be on the correct orientation. One odd thing is that my red motor has the red and blue wires, while yours has the black and white wires. Did you reverse the plastic clips? Are you getting the correct direction of thrust on both motors? If you are, then maybe the motors are just running inward instead out outward, although it seems like that would still fly as long as your props are installed to match.

Another possibility is that your red motor seems to be installed with quite a bit of upward thrust angle. Maybe when you throttle up, the gyro is fighting to keep it stable and can’t compensate?

I’d be curious to hear a fuller description of how it’s behaving though, or a video.

 

[L Edge]

So, I thought it was the CG and we messed around with it for a long while.

My new idea is that the motors are too near the edge and are twisting when power is applied. Launched at quarter throttle is flys perfectly straight, just losses altitude. Any more throttle or differential and stuff gets weird.

I believe your weirdness can be solved by strengthening around the motors. Your prop angle is tipped up and don't believe the motor mount is rigid enough. Probably oscillates and causes all that stuff.

From your top view of the plane, the corrugated strips in the cardboard, run parallel to the motor mounts. Why don't you use something(tooth picks?) inserted and glued within the corrugated area and up to and including the prop end of the mount to improve your rigidity around the slot. Start off with the props vertical and see what happens again.

 

[BadAir]

Weird how?

The board appears to be on the correct orientation. One odd thing is that my red motor has the red and blue wires, while yours has the black and white wires. Did you reverse the plastic clips? Are you getting the correct direction of thrust on both motors? If you are, then maybe the motors are just running inward instead out outward, although it seems like that would still fly as long as your props are installed to match.

Another possibility is that your red motor seems to be installed with quite a bit of upward thrust angle. Maybe when you throttle up, the gyro is fighting to keep it stable and can’t compensate?

I’d be curious to hear a fuller description of how it’s behaving though, or a video.

It's possible the wires were swapped the last time we moved the board while we're were trying to pin down the CG.

 

[BadAir]

I believe your weirdness can be solved by strengthening around the motors. Your prop angle is tipped up and don't believe the motor mount is rigid enough. Probably oscillates and causes all that stuff.

From your top view of the plane, the corrugated strips in the cardboard, run parallel to the motor mounts. Why don't you use something(tooth picks?) inserted and glued within the corrugated area and up to and including the prop end of the mount to improve your rigidity around the slot. Start off with the props vertical and see what happens again.

The picture are post testing. The wing got pretty beat up. What you describe is pretty much the plan.

Going to build have my prototype guys build a larger larger version like this and one with straight wing. Making it bigger will leave more material around the motor mount.

There is lots of unnecessary weight that we can get rid of. Way too much glue, half the foam board. We can make it 15 or 20% lighter.

 

[L Edge]

The picture are post testing. The wing got pretty beat up. What you describe is pretty much the plan.

Going to build have my prototype guys build a larger larger version like this and one with straight wing. Making it bigger will leave more material around the motor mount.

There is lots of unnecessary weight that we can get rid of. Way too much glue, half the foam board. We can make it 15 or 20% lighter.

Have a thought for you. Have you seen the thread dealing with using aluminum for airplanes shapes and trying a few shapes to see if this could be an option plus your cardboard approach? (Metal Wing Micro Plane)

Assuming it works without any drops from transmitter/FC, you could purchase one of the large throw away stiff aluminum turkey pans and cut out the pattern(deltas, B'2s) etc. and try to see if that would work?

I have my B2 Spirit that flies, might try that myself.

 

[BadAir]

Have a thought for you. Have you seen the thread dealing with using aluminum for airplanes shapes and trying a few shapes to see if this could be an option plus your cardboard approach? (Metal Wing Micro Plane)

Assuming it works without any drops from transmitter/FC, you could purchase one of the large throw away stiff aluminum turkey pans and cut out the pattern(deltas, B'2s) etc. and try to see if that would work?

I have my B2 Spirit that flies, might try that myself.

Sounds interesting. I will check it out.