Revisiting paper airplanes - like we probably all started out with...
- Klipkopwildlife
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- jon.in.swansea
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Although I figured out how to do dual rates on the elevator & aileron my skills with OpenTx only got me to the point of telling the motor vector servo to act on 15% of whatever the aileron is doing. I haven't figured out how the motor vector mixer detects that aileron is on the lower rates. More research required.
Pragmatically, as 60% rates is what I will be mostly using for a while I might just bump that 15% weighting to 20% for the motor vector.
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- Klipkopwildlife
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- jon.in.swansea
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stretches with hundreds of meters of packed sand. It can be very windy and there are times when it is dead calm.
When there are gaps in the dog walkers I wondered about setting up there for some flights.
Anyone have any ideas, comments, advise? Show I stay well away or not?
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- Eric
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Apart from that, your main problems will be the proximity of salt, and sandy grit getting into the motor bearings.
if you are calm and collected when all about you are going berserk - you've missed something important!
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- jon.in.swansea
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I reviewed the Tx settings and took it out to the playing fields. Sunny, almost calm. I planned what I wanted to check out during a flight and then mostly followed that plan. I found it rather more responsive, smoother in changing height and able to do both tight and a lazy turns and did a reduced power landing almost getting the feather ok at the end.
I took the flight film and added commentary with a close look at the control surfaces, linkages and the vector control for the motor. 5m video is at:
A second flight was super-twitchy and I didn't react fast enough while it was still just above head height. Damage extensive.
I think I will finish one of my other partial builds before returning to this beastie - the repair to flying overhead is just a bit extreme....
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- Klipkopwildlife
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- jon.in.swansea
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And our very own Quorneng has the 707 Albatros so I will have lots of back-posts to look over. I did have a look at the video demonstrating the no-flaps, 15 & 45 degrees and goodness that is such an elegant flyer (in comparison to the rather jumpy nature of the PlanPrint Paper.
Looking earlier I see a December 2023 view inside the cockpit and then some discussions of the flap etc. And in November of 2023 some entries about the cowling and ducts. And back in October of 2023 I was asking about such a conversion.
Will need to look closely at the photos to figure out how much you cut out of the fuse. Any more photos of that process?
The bending of the wing discussed in early Nov of 2023 - that I might want to know more about but perhaps just go for a larger aileron inboard of the existing tip dihedral?
Interesting stuff - clearly there as some CAD work making up bits for it. Are the STL / CAD files most good for someone wanting to do a conversion?
I do like dihedral and in other models I have created a structural block to fit where wings join fuse to allow spars to have a 2-3 degree dihedral. So I would likely look closely at the supplied wing join and see if I could work out something...
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- Quorneng
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In its "out of box" form the FX707 has a one piece full span carbon tube spar. It is a slide fit in each wing half so it can be disassembled. It follows that creating dihedral from the wing root would require the spar to be divided and a substantial centre block created to hold each carbon tube half. Could be quite a bit of work (& weight) to achieve.
I note that there are several post on other sites where wing flex with the FX707 is noted and various methods given for adding stiffness.
Both my FX707s use the original spar but the wing halves are permanently joined not for strength but to save the weight of quite a few of the supplied plastic wing join pieces.
My own view is wing flex need not be a problem. It is not necessarily a sign of structural weakness as both the carbon tube and foam will flex far more than balsa ever can. After all full size glider wings flex like mad and they have a human on board.
My FX707 wing does flex a bit doing a loop (say 4g max?) but nothing like as much as this full size Nimbus!
I will follow your conversion with interest.
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- Eric
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And, if you look at the recent crop of Boeings and Airbus liners, made of 'plastic', they flap and waggle quite spectacularly at times!
The wind tomorrow is SUPPOSED to be from the North. We'll see!
if you are calm and collected when all about you are going berserk - you've missed something important!
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- Klipkopwildlife
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- jon.in.swansea
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And something I didn't mention in my build process - I found that the elevons didn't have much clearance and with just a bit of flex in the wing they would bind. I took a file to the left and right edges of these control surfaces and tried to get a 2mm gap. I also taped across the aft 'V' to limit the flex in the fuse.
I assume that if M was launching there would be no video - that was so valuable in trying to figure out what was happening in the model....
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- Klipkopwildlife
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All we've got is mostly sky.
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- Eric
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Bend the (presumably) wire sight so you can see it in front of your eye -
Then if you adjust the whole mount assembly, so that you are looking through the 'gunsight' - the model HAS to be in frame - unless it goes too far away!
And as you are looking at the model anyway, (or should be!) there is no worry about keeping it in the frame, because your head can move to track it!
if you are calm and collected when all about you are going berserk - you've missed something important!
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- jon.in.swansea
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The wire-on-the-gopro-mount comment earlier is what I use.
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