Mr Man
Mr SPEED!
Hmm, bloody wonder I see.đź‘Ť
EZ Power Pack Pizza Box
- Thread starter BadAir
- Start date
Large format printer, we have.
Inspirational for now.
My son had an after school thing today so I decided to build my own pizza box plane. It turned into a Sea Duck/Cabby/Bloody Wonder mash up.
It is the most immaculate scratch build. The balance was perfect on the first try. It didn't need any ballast or trim.
Wanted to use the 3" props but they can't be installed tractor.
As it is, it might be the straightest flying thing I've ever built. Straight into the opposite wall. 12" wingspan is just not enough and it needs 85% throttle just to fly. Which, to be fair, it does, but by attempting to beat the air into submission instead of what I intended.
I knew going in that it really didn't meet the minimum threshold. But my 8520's got delivered today. I just need an appropriate prop and we will teach the air who is boss.
For single minded target fixation, I dub him Taxi Driver.
Any body got prop options?
It is the most immaculate scratch build. The balance was perfect on the first try. It didn't need any ballast or trim.
Wanted to use the 3" props but they can't be installed tractor.
As it is, it might be the straightest flying thing I've ever built. Straight into the opposite wall. 12" wingspan is just not enough and it needs 85% throttle just to fly. Which, to be fair, it does, but by attempting to beat the air into submission instead of what I intended.
I knew going in that it really didn't meet the minimum threshold. But my 8520's got delivered today. I just need an appropriate prop and we will teach the air who is boss.
For single minded target fixation, I dub him Taxi Driver.
Any body got prop options?
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Piotrsko
Master member
Install prop backwards and maybe spin backwards. You'll loose some thrust forward like about 1"of pitch. How I used to make pushers out of tractor props on my .049s but that was before your fathers time so the memory is hazy and it's too cold to go verify out in the garage storage.
Post a picture of the props...
can you carefully drill the prop hole all the way through?
Me? No. My hands are big side... For the NFL. More importantly I lack the dexterity required for pretty my much any creative endeavor.
My wife on the other hand...
I'm almost certain I have a small set of wire size Dremel bits. Somewhere.
There is a tiny pilot hole. It will be worth sacrificing a pair of cheap props to they will still grab with the obstruction removed.
L Edge
Master member
Why you probably could not turn is probably due to the radio programming.
The closer the throttle is to full open, it has less and less motor differential available for you to use.
Notice that your vertical component area(fuse and over wing) is quite large, so in order to turn by differential, you will need more thrust from the motors. In your case, you reached the top rpm's and did not have torque to overcome the drag to turn. One solution is you need to loose weight of model. Hope your new props work.
Did you also notice if you almost have no rpm's coming in or sota at an low idle, coming in for a landing and you use differential, it spins up high and ruins your landing. If it touches ground quickly, it will need new props or cause you vibrations in flight.
The closer the throttle is to full open, it has less and less motor differential available for you to use.
Notice that your vertical component area(fuse and over wing) is quite large, so in order to turn by differential, you will need more thrust from the motors. In your case, you reached the top rpm's and did not have torque to overcome the drag to turn. One solution is you need to loose weight of model. Hope your new props work.
Did you also notice if you almost have no rpm's coming in or sota at an low idle, coming in for a landing and you use differential, it spins up high and ruins your landing. If it touches ground quickly, it will need new props or cause you vibrations in flight.
This is a little off the wall, but I was looking at little electromagnetic micro servos last night and I was thinking I could wire one to the LED switch.
This way I could lock in full rudder to assist with turning in confined areas.
It should work, if only one direction, no?
This way I could lock in full rudder to assist with turning in confined areas.
It should work, if only one direction, no?
Absolutely.
I knew it was the going to be borderline.
With bigger motor and props I should have more headroom on the throttle for differential.
Not an elegant solution, but I'm just looking for edge so I can keep kids successful. The primary goal is them to fly straight for 6-8 seconds and survive the first 5 crashes sufficiently repairable to fly again.
L Edge
Master member
The LED switch is an off/on condition. Question is, Does the electromagnetic servo return to original position if power is off ? You would have to check. Might use a rubber band to bring it back to original.
How would you know how much rudder to add? Each shape plane is different in the amount of rudder you use for the turn. If too much, it will spiral down.
L Edge
Master member
You talked about 8520's and 3" props. Are you using a different FC or are you going to plug it in FT one?
There are self centering varieties.
Obviously it would take some experimentation, but it might be useful indoors.
The 3" props are running on the 816's and the EZ FC. I haven't run them for more than about a minute.
I'm going to try the 8520's on the EZ v2 FC. Other people have reported success, we will see. We are printing the motor mounts now.
I wonder if you could Siamese two boards to run off the same gyro?
At that point, you might as well buy a standard FC and brushed ESCs.
That would would be easy and practical, but I need a EZ B-29. This probably isn't the thread.
L Edge
Master member
First of all, using larger motors and bigger props will increase the amperage. So, it will be interesting if it smokes the FC.
Review:
Weight of EZ Pac is about 28 grams. After doing 7 different design shapes(bipe,SR-71,circle,delta,flying wing, forward swept wing, bobcat with dual boom) my weights varied from 38.8 to 70+ AUW. Add the straight wing variations others have added and their weight.
Results:
That means your have 42 grams to only use for material and glue.
The heavier(over 50grams) needs a good fast launch in order to get flying(example- bipe and really oscillates in flight and really doesn't like the wind)
Heavier weight means turns larger due to less differential available. So, indoors turns in gym, will be mainly controlled by weight .
Yes ,it would be easier to have a 3rd channel(elevator) to help with turns. Would work indoors.
Oh, by the way, I am making progress on my B-29, not ready to present it yet.
How come you haven't explored the real world of foamy RC planes where you can really try out your ideas? The world of EDF's is one that very few explore, especially with the newer generation of future fighters like the F-47.
Mr Man
Mr SPEED!
I believe he might have a school budget...
Our flights have a tendency to be brutally short, so we aren't really testing the FC board to its limits. I could put together a run stand and torture one to death, but since the build quality is inconsistent it wouldn't prove much.
I've been involved in designing and building other planes, but I wasn't joking or exaggerating when I said I don't fly particularly well. It isn't for lack of trying. I have a condition the impairs the creation of visual memory and severely (in my case, almost totally) limits any mental imagery. You could give an average 10 year old kid a transmitter and in a couple of minutes they would be able to fly the plane as well as I can after messing with them off and on for a decade.
I think I'm going to build a FPV for myself and see if I fare any better. The cost has come down to the point it isn't the barrier it once was.
