Scooter The White Rabbit
Active member
Not quite R-T-F... but She's BUILT!
First Build FT Guinea Pig as my Trainer/First Plane.
- Thread starter Scooter The White Rabbit
- Start date
Not quite R-T-F... but She's BUILT!
Scooter The White Rabbit
Active member
She had one tiny problem with rudder horns hanging on lower panels, a little trimming fixed it. Should have put horns on outside of the rudders to even wire throw.
Scooter The White Rabbit
Active member
Still came from late nights after work, driven by a vision of her in my mind. The rubber bands on her are for display only at this point. Still miles to go before she flies. Fix tail, paint livery, install lights-flight gear-receiver-etc.
Anyone ever build a AWACS out of something like this bird? Hmm. FT Guinea Pig with a RADAR DISC on top. Hmm.
Scooter The White Rabbit
Active member
Gotta fix servo horns and wires on rudders. Need to go on the outside for proper throw. Inside they pull on the inboard panel more than the outboard one. Not good.
Scooter The White Rabbit
Active member
Well Carmine... is like this, sure why not!
I've been looking at Skyvan photos for a few months now... And that tail! My only hang up is in the servo horns.
The tiny leftover of the original tail is connected to the standard servo location. Above the servo horn on the mini-control tail are two driver servo horns, one on each side aimed backward. Those drive by servo wire backwards servo horns on the two rudders. Except I forgot about equal length throws... so I have to move the horns on the rudders outboard. Hang it all!
For those paying attention what's up in the background, yes that is the kit Guinea awaiting contractors to begin building her. And yes, those are dowel pins for the wing pins. To me the BBQ skewers are to thin.
I've been looking at Skyvan photos for a few months now... And that tail! My only hang up is in the servo horns.
The tiny leftover of the original tail is connected to the standard servo location. Above the servo horn on the mini-control tail are two driver servo horns, one on each side aimed backward. Those drive by servo wire backwards servo horns on the two rudders. Except I forgot about equal length throws... so I have to move the horns on the rudders outboard. Hang it all!
For those paying attention what's up in the background, yes that is the kit Guinea awaiting contractors to begin building her. And yes, those are dowel pins for the wing pins. To me the BBQ skewers are to thin.
Scooter The White Rabbit
Active member
Carmine... Duuuude! Scratch building 101. Look at other things like but not exactly your model that you like... better. Then study and think to yourself... "Self? How do I do that?" Paper and pencil, draft, draw, doodle, whatever. Work it out. OR.... just ask us on here.
Scooter The White Rabbit
Active member
Some of us are old school and don't have 3D CAD programs, but a little wiggles and squiggles on a page and then in a paint program... Viola!
Scooter The White Rabbit
Active member
Just remember, notch the base of the rudder for the horn swing, and actually mount the horns on the outside of the rudders.
Scooter The White Rabbit
Active member
Updated to what I need to change Sky-Truck tail to. Note that now the connecting servo wire is the same and equal length.
buzzbomb
I know nothing!
I'm not seeing it actually. You lengthened the wires to the horns by moving the horns to the outside. I'm not seeing any other change.
PoorManRC
Master member
Thanks for all that info!! I'm VERY Old School. Been building, modifying, kitbashing and scratchbuilding since 1977!!
I wouldn't know CAD, if it bit me in the ass!!!
And I've never even SEEN a 3D Printer.... really! I've got ideas and things I can draw from..... And a LOT of great People here to get ideas from.
Scooter The White Rabbit
Active member
That's all I had to do. With the horns inside, the wires are too short and the outside rudder moves more than the inside one. The throw needs to be equal on both rudders for smooth operation.
Scooter The White Rabbit
Active member
BTW (By The Way) the kids at work taught me. If you have an idea and want to SLAP it by me, just hit me up in a conversation and I'll SNAP off some ideas of how to build it until we've got the bugs worked out. Having scrap FB around helps. One of the gals at my DT suggested for any DTFB project always buy one board extra for every five boards. So 1-5 add one, 2-10 add 2. Gives you "Oops Room" she called it. LOL
Scooter The White Rabbit
Active member
That's all she needed. That equaled the throw length. Horns inside, one of the rudders moves more than the other. NOT GOOD! I want her to fly, not wing over and dive into the ground! he he he.
Scooter The White Rabbit
Active member
Just looked over my posts. Reminds me of Robin Williams talking about Ronald Reagan. I've been repeating myself... i've been repeating myself... I've been repeating myself... uh... what were we talking about?
Hai-Lee
Old and Bold RC PILOT
I am uncertain if your non-linear rudder problem has been fixed but there is a simple rule to ensure that you get plus and minus servo movements to be the same when translated to a control surface. That rule is 90 Degrees.
All pushrods where they connect to the servo should be such that they are at 90 degrees to the servo output arm and the point on the control horn where the pushrod connects must be at 90 degrees to the control surface and directly over the hinge line.
If you wish it I could rough up 90 Degree connection diagram for your rudder setup. Just let me know!
Have fun!
All pushrods where they connect to the servo should be such that they are at 90 degrees to the servo output arm and the point on the control horn where the pushrod connects must be at 90 degrees to the control surface and directly over the hinge line.
If you wish it I could rough up 90 Degree connection diagram for your rudder setup. Just let me know!
Have fun!
Scooter The White Rabbit
Active member
Have a look at the following photos where I fixed the tail as well as I can now. I don't have a bell crank, but if needed I could scrap the whole center upright except what is needed to lock in the tail, then install the crank and arms to it.
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