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Old Sep 02, 2014, 10:02 AM
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Thanx Flight test

I've been doing the V44 for F&T for years.

Bob
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Old Oct 02, 2014, 09:46 AM
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Hi guys any pics or details on the tilting mechanism?
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Old Nov 09, 2014, 12:48 AM
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8 degree tilt

Can anyone explain why the motors are tilted towards each other 8 degrees in hover?
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Old Nov 09, 2014, 01:37 PM
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It uses a well known NASA technique called "cattywampus construction" where each piece of the aircraft is purposely slightly out of faze creating a synergistic harmonics in the airframe that assists with lift by cancelling out unwanted forces. In other words, it's like that because it's made out of foam and tape.
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Old Nov 09, 2014, 06:03 PM
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I'm dying of laughter, RCvertt... Ahahahah however your diagnostics of my airframe design is pretty spot on!
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Old Nov 09, 2014, 06:14 PM
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It actually isn't to far off Rcvertt ,, the real V uses bidirectional carbon fiber to do away with unwanted harmoics .... and actually on the real V it used about 4 degrees of out nacelle angle for stability purposes.

I used by directional plywood sub frame in the NASA Puffin to eliminate wing vibrations
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Old Nov 09, 2014, 06:38 PM
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Good to know. I'm a devout follower of "foam and tape's" building methods
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Old Nov 10, 2014, 05:25 AM
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If you plan on using the nacelle tilt to control pitch, then you definitely don't want the tilt axis to be canted inward. It would reduce the distance between the tilt axis and the CG.
As for the fore/aft tilt, it helps a bit with pitch stability in slow forward flight, and depending on the direction of rotation of the rotors it improves yaw control in a hover.
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Old Nov 11, 2014, 06:44 AM
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amzaing thread ..... i was planning on building a vtol myself for the past couple of weeks but after watching you guys i am more determined to build one .... i am sure i can count on you guys for help
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Old Mar 12, 2015, 09:51 PM
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PROBLEM:

After two complete builds and less than total success on either, I have tweaked the design again and built a new air frame.

When in forward (airplane) mode the motors work correctly with variable speed controlling the yaw. When I change modes to Quad mode the motors don't respond to throttle, they remain at RPM until I throttle down. Once they stop they won't re-spool up in Quad mode. I don't know if the gyros work because the motors won't stay on or respond to throttle. The gyros read because I can see it on the GUI in the Conf. file.













e
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Old Mar 12, 2015, 10:31 PM
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Quote:
Originally Posted by tom-tom 1 View Post
PROBLEM:

After two complete builds and less than total success on either, I have tweaked the design again and built a new air frame.

When in forward (airplane) mode the motors work correctly with variable speed controlling the yaw. When I change modes to Quad mode the motors don't respond to throttle, they remain at RPM until I throttle down. Once they stop they won't re-spool up in Quad mode. I don't know if the gyros work because the motors won't stay on or respond to throttle. The gyros read because I can see it on the GUI in the Conf. file

e
It sounds like you are having problems with the flight controller. Not saying anything bad about any flight controllers, but if you are building a VTOL then OpenAero-VTOL firmware in a KK2 board is a proven solution.

http://www.rcgroups.com/forums/showthread.php?t=1972686
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Old Mar 13, 2015, 03:53 AM
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Quote:
Originally Posted by tom-tom 1 View Post
PROBLEM:

After two complete builds and less than total success on either, I have tweaked the design again and built a new air frame.

When in forward (airplane) mode the motors work correctly with variable speed controlling the yaw. When I change modes to Quad mode the motors don't respond to throttle, they remain at RPM until I throttle down. Once they stop they won't re-spool up in Quad mode. I don't know if the gyros work because the motors won't stay on or respond to throttle. The gyros read because I can see it on the GUI in the Conf. file...
Your last flight video looked good except for that last turn which you mentioned was due to a low battery. Did you ever get this version to hover? As strange as it may seem, forward flight is more difficult than hovering so it sounds like you had the most difficult part working before these recent builds you mention.

Not sure what code you are using exactly. Your last post was Feb 06, 2013, so it's old 1.7 code which I don't mess with anymore. You'd have to upgrade to 2.3 for me to help further. Get it hovering with 2.3 first, then we can look into adding forward flight stuff if you want.
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Old Mar 13, 2015, 08:24 PM
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RCvertt

Yes, I'm still using the same board with 1.7 code. I got the last version flying in forward flight but it did not have the power to hover. I crashed it and started a third air frame, tweaking the design. I made it larger to allow for larger motors and more air flow down through the wings allowing more lift.

I'm really getting frustrated with the multiwii board and my failure getting the plane to fly. The board worked correctly in the last plane. It just didn't have the power to hover. Now it doesn't work correctly. You correctly stated a long time has passed since last worked on this project. That being said, time has allowed my frustration to fade somewhat, so I started working on it again this week.

I will try to remember how I checked the board and downloaded the code and proceed from there. I didn't review relatively recent postings so I don't know if you have shared the 2.3 code. I will review the thread for it and check out the board. I also have components to build another one if needed.

Thank you so much for watching the thread and responding.
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Old Mar 13, 2015, 08:35 PM
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Ran D. St. Clair

Thank you very much for your response. I have started reading the thread you provided about the OpenAero - VTOL firmware for the KK2 board. I am somewhat familiar with the KK2 board. I have used the one Matt from Simple Copter uses in the tri-copter and V-tail Quads he sells and which I fly. I have not downloaded firmware, I use the firmware he flashes to them. They work really well and are very convenient and easy to use.
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Old Mar 13, 2015, 09:47 PM
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Sure thing. I have not shared any 2.3 code yet. I've only built a VTOL tail sitter with it that does the switching of controls automatically, no need to flick a switch. I forget if you use motor tilt for yaw control while hovering. If you don't then regular MultiWii should get you hovering. If you do, then it would be best to get your bird flying forward again then we can work on some special code for hover yaw.

I need to finish up the Edge of Tomorrow build so basically if I help you get yours working then I'll be able to use the code ideas for my build as well. The tail sitter build has already gotten a lot of the work out of the way for us. I think you'll just get more frustrated if you continue with the 1.7 code since it's so old now and no longer supported by me. You'll have to install a new multiwii board though for 2.3. I've only used the NanoWii from HK and an arduino nano/GY-521 combo with 2.3 so those are the only board combos I can recommend.
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