|Nov 03, 2012, 09:44 AM|
Canada, ON, Maynooth
Joined Nov 2011
Nice thread! I came across the mini panther vid a couple of weeks ago... Just found this thread this morning, really excited that others have taken up the challenge!
I'd like to build one of these, and am wondering what you guys think about these airframe choices... these are frames I have already and think would make good choices,,,
1800mm Icon A5, for Amphibious VTOL ... or,
60" blunt nosed EPP Delta Wing... or
52" OV-10 Bronco.
As for the tri copter, i was hoping to use another ARF, and adapt the tilt rotors for all three motor mounts ...
Am I way off, or getting close?
As far as the control system goes, i am thinking that a dual Rx, on wireless buddy box switch, with programed transitions using ersky board to execute the change from hover to forward flight...
Multi rotor controller on one Rx (likely KK or rabbit)
and fixed wing system on the other Rx (likely FY-31AP)
I am still reading tru the previous posts and getting up to speed... looks like you guys have it pretty much worked out... any comments are much appreciated
|Nov 03, 2012, 10:38 AM|
Here are my thoughts:
1) A Stryker is a nice tough wing with a good configuration to merge with a tricopter. They fly well and the cg is well known. Not to heavy, minimal building and available cheap...about $25 for the bare airframe at a local hobby store.
2) Wii flight control board. For hovering and fast hovering (motors tilted up to about 45 degrees forward) no special code required. You can run the elevon servos directly from the Rx if you choose.
3) You may be able to achieve forward flight on the wing with no special programming too.
Have a look at the videos below:
1) Stryker strapped to the back of a T copter for VTOL
2) Stryker/T-copter hybrid
3) VTOL Jet no control surfaces or special programming.
|Nov 03, 2012, 12:24 PM|
My thoughts: Using two receivers for two different modes is somewhat unnecessary, and over-complex actually. Using the MultiWii flight controller to drive the wing elevon servos and do all the switching over for forward flight is much easier. It requires a bit of coding, which can be tough, but the rewards are worth it.
leadfeather: Oh Yeah! I'd seen your videos before and couldn't remember who posted them. Thanks for reposting those here, your VTOL Stryker inspired me! Earlier this summer, I decided to do my own scratch build with the rear motor tilting instead of the front two: It worked great, but is just to fragile of a mechanism, hence why I've moved on to designing a dual/bicopter type machine like your Stryker / IAI Panther. (That, and other reasons...)
|Nov 04, 2012, 11:37 PM|
If you are good at flying you might be able to get away without changing the code.
I'm not a great pilot so changing the code was the only way that helped me fly my VTOL quadcopter. Without changes to the code, it was unflyable for me. With the code changes it was a piece of cake to fly.
As for motor selection and such it's rather simple. Buy a motor, prop and scale first and do some thrust tests. That will tell you how light your plane needs to be and what equipment you need to meet that weight goal.
|Feb 11, 2013, 11:03 PM|
Had my first full transitions today
Almost scavenged it for parts a few times before I decided to give it another try. I'm glad it survived the scrap yard.
|Feb 12, 2013, 02:37 AM|
Another video from today...
My recommendations for getting a VTOL working are to first get each of the three modes working on their own. First get a conventional takeoff and landing working to find a CG that gives good flight performance. Then get a stable hover working around that CG which usually just means trimming the motor commands in pitch until it hovers level. Then mix the controls for 45 degree mode which usually means weaker hover controls along with full forward flight controls.
Either a cordless glue gun or a car inverter is also essential to take to the flying field. Got my inverter for 10$ from Fry's. With two batteries I can easily crash several times and glue it back together at the field which lets me get more testing done.
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