Red
Very Strong User
Hi Stephane,
).
I don't think I will need a return, but that certainly is an option. I am making some new cams, I'll have more pics soon.
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Sonic - like VTPR build
- Thread starter Red
- Start date
I don't think I will need a return, but that certainly is an option. I am making some new cams, I'll have more pics soon.
Red
Very Strong User
Hi Stephane,
You can read more here: https://forum.alofthobbies.com/index.php?threads/impulse-if-1.3085/
You can read more here: https://forum.alofthobbies.com/index.php?threads/impulse-if-1.3085/
Red
Very Strong User
Hey All,
Back working on this one. The MadStab mechanism is what I have been focused on. I have the cam system working in prototype form. I'm getting about 155 degrees of travel now, but I would like closer to 180 degrees. There is some flex and slip, but it shows enough promise that I feel comfortable putting in the effort now.
Wings are progressing as well. I scavenged a carbon joiner and sockets from a EFlite Carbon Cub. I have them dry fit in the cores, need to make some false ribs to capture each end, then I can sheet them.
Red
Back working on this one. The MadStab mechanism is what I have been focused on. I have the cam system working in prototype form. I'm getting about 155 degrees of travel now, but I would like closer to 180 degrees. There is some flex and slip, but it shows enough promise that I feel comfortable putting in the effort now.
Wings are progressing as well. I scavenged a carbon joiner and sockets from a EFlite Carbon Cub. I have them dry fit in the cores, need to make some false ribs to capture each end, then I can sheet them.
Red
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Stephane
Strong User
Nice one Red!
You're right you should get at least 170°. Or if you can't, focus only on upper direction to get +90°. Because below 85°, you won't flip.
How do you plan to ensure high tension in the cables? - I like very much the trolley system I use on the Svolazzo, from François Cahour.
You're right you should get at least 170°. Or if you can't, focus only on upper direction to get +90°. Because below 85°, you won't flip.
How do you plan to ensure high tension in the cables? - I like very much the trolley system I use on the Svolazzo, from François Cahour.
purview
Very Strong User
how much torque on the servo for your xx" project?
do @Stephane know what the new flight regimes at >90°angle are good for. I read your VTPR reports and tips, only spare information what the plane is capable of with that amount of deflection. Firstly it can flip positive and negative (depends on the aerofoil) and... imagine — level flight, 1/4 roll to knife edge, flip and 1/4 roll back to level — lost me?
Red
Very Strong User
That's a great idea Stefane, I'll consider it.
Red
Very Strong User
I'm using a JR8717 servo which is 160+ in/oz. Not sure I need that much but overkill is good.
Red
Very Strong User
100" actually and light as possible.
Red
Very Strong User
A little more progress. I’ve replaced the Delrin bushings with ball bearings. The fit was good before, it’s excellent now! I’ve played with the cam ratios and am getting a full 180 degrees. I need to change out the pull pull cables to something steel core for less stretch, but this is the final configuration. I added a carbon tube below and ahead of the stab pivot to act as a
guide for the cables too. Now with the stab cam is rotated 50 degrees with the elevators neutral, I get perfect geometry.
I laser cut some ply root and false ribs to capture the wing tube and got that all fit and bonded. Almost time to sheet the wings after I cut servo pockets and run extension wire. It’s a pretty straight forward build from here I think.
guide for the cables too. Now with the stab cam is rotated 50 degrees with the elevators neutral, I get perfect geometry.
I laser cut some ply root and false ribs to capture the wing tube and got that all fit and bonded. Almost time to sheet the wings after I cut servo pockets and run extension wire. It’s a pretty straight forward build from here I think.
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Hawaii Sloper
Very Strong User
Red
Very Strong User
Yes, the one from Hitec. Cycles and programs too which can be handy.
Hawaii Sloper
Very Strong User
This is one I've been looking at: toolkitrc-st8-advanced-multi-servo-tester
has way more features than I need but it seems like it would be high quality.
I'd probably want to see the manual before I bought one.
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Red
Very Strong User
Yeah I'm sure that would work just fine. I use mine on every build. Much easy top center servos, test throws etc. instead of hooking all the radio up. Invaluable IMHO.
Hawaii Sloper
Very Strong User
Red
Very Strong User
They are all universal, servo brand doesn't matter.
Honestly some of the old name brand units are the best if you can find one.
We use the little el-cheapo units that we sell at aloft, and those are fine too. I like that they are small and cheap. We have used ours so much that we ended up 3D printing little hard cases for them.
I'd actually prefer one that defaults to centered, but not a big deal. For my first 30 years in the hobby I used my radio to center.
We use the little el-cheapo units that we sell at aloft, and those are fine too. I like that they are small and cheap. We have used ours so much that we ended up 3D printing little hard cases for them.
I'd actually prefer one that defaults to centered, but not a big deal. For my first 30 years in the hobby I used my radio to center.
Hawaii Sloper
Very Strong User
I have one of the basic ones and that has worked ok for me also. I like the idea of being able to program the center a lot. It would just take some of the frustration out of mechanical and radio setup.
Doc J
Very Strong User
This one works well. Not too spendy and sold by an up and coming R/C outfit.
Sorry about the web address...
Cheers,
Doc
