General Electric Discussions Talk about topics related to e-powered RC flying

Transforming vtol edf jet drone (varitech) – robotech project

Old 06-27-2016, 01:50 AM
  #26  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

After losing my variable wing unit last year, I gave a break to this project. But I like it too much to stop working on…

This is a new unit equipped with my variable angle FC concept and variable thrust vectoring algorithm. The difference about this one is that it is 64mm and is equipped with large metal gear servos. I am hoping to test a new aerodynamic design with this unit to improve the maneuvering capabilities in horizontal high speed flight. Didn’t want to move forward with the build in case it wouldn’t fly

The first flight. A little wobbly but not bad for a new unit. Just needs compensation rates a little reduced…

https://www.youtube.com/watch?v=Dwkl...ature=youtu.be
VAALLEON is offline  
Old 07-09-2016, 05:18 AM
  #27  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

This is how my new unit is shaping. It looks like a base Mono but it’s not My goal is to merge the advantages of my successful base lateral cross-wing design on the new transformer and improve the maneuvering capabilities of the base unit with some new tweaks in the design…

There is a reason the front wings are cut in half. Coming up soon

https://www.youtube.com/watch?v=ph7I...ature=youtu.be
VAALLEON is offline  
Old 07-11-2016, 03:53 AM
  #28  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

We are getting close the the first tests with the final design:

The nozzle wings' surface areas were increased with the new front wing design, which will hopefully increase the flight control in horizontal flight significantly.

The advantages of the cross lateral wing design was preserved in this hybrid design. With some changes:

The sweeping wings have a larger surface area than the regular base units and they have aerofoil design to help the lift.

The wing servo is separate than the neck servo that controls the flight controller. Which means that I will be able to control the wings independently.

I will post the first test flights soon...
Attached Images
File Type: jpg
1.jpg (920.1 KB, 207 views)
File Type: jpg
2.jpg (913.4 KB, 286 views)
File Type: jpg
3.jpg (935.5 KB, 203 views)
File Type: jpg
4.jpg (966.0 KB, 211 views)
File Type: jpg
5.jpg (933.9 KB, 157 views)
File Type: jpg
6.jpg (908.8 KB, 198 views)
File Type: jpg
7.jpg (954.2 KB, 228 views)
VAALLEON is offline  
Old 07-15-2016, 02:37 AM
  #29  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

The firsts tests didn’t go too bad but I had a couple of bummers… Like I lost the wing servo in the middle of the flight yesterday. Now it is replaced with a metal gear brand new servo.

In this first setup, the wing servo is connected to the gimbal pin and opens as the unit tilts forward. So, I don’t use the 5th channel and transform the unit, and tilt it just with the pitch. I always wanted to test this, and now the wing servo being separate from the neck servo, I can.

The flight went well. However, my fear of compensation being high for the larger control surfaces proved to be true. I need a level of compensation level for vertical flight, but now the control surfaces being way larger, in fast forward flight the compensation caused the back of the unit flutter. Reducing the compensation level to 75% helped reduce but didn’t prevent the fluttering. You can see this clearly in 1:20 minute mark.

On a good note though, seeing the flutter felt very airplane like, which means that I am getting closer to airplane aerodynamics in horizontal flight, which means better maneuverability in horizontal flight

The variable sweeping wing again proved to be very balanced and easy going. Since I don’t need the variable wing action in normal flight where I don’t transform the unit, I will not worry too much about fluttering and connect the wing servo to 5th channel and start testing the transforming phase. We will see how it reacts in this format.

Depending on this, I will start shaping the wings and try to find the happy medium between vertical and horizontal flight.

Thanks…

https://www.youtube.com/watch?v=t1si...ature=youtu.be
VAALLEON is offline  
Old 07-29-2016, 08:27 PM
  #30  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

Enough messin’ around. Going for the first humanoid varitech. I believe I have enough experience with folding and sweeping wings to try this and transition it to a jet in the air. First it has to be able to do the vertical tho…

Don’t get me wrong it will not be easy!

If I can manage this, I will go for dual fans...
Attached Images
File Type: jpg
robo1.jpg (877.0 KB, 161 views)
VAALLEON is offline  
Old 07-31-2016, 02:55 AM
  #31  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

Decided to call it MONOID.
Here’s how the neck / wing mechanism works.

https://www.youtube.com/watch?v=hXx8...ature=youtu.be
VAALLEON is offline  
Old 08-04-2016, 05:05 AM
  #32  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

I had lots of trouble on the way to the maiden flight. First of all, I found out that the new metal gear digital servos have been sabotaging my project. For some reason they weren’t able to process mixed servo signal properly and I couldn’t find I way to work with them even though I played around with the code many times. So, they went to my junkyard…

I picked up 4 old servos that I have used in the past. These servos are pretty reliable, proven to work with the code but their shafts are not sturdy. Anyway, still worth a try, just to see if the beast will fly!

After adapting the new servos, this time the ESC BEC didn’t handle the load. So, I again picked up an old ESC with a defective BEC and added my 10A UBEC to the system. Good to go…

It did fly at the first try and the flight was pretty good! It was very responsive to the input. May need to lower the center of gravity a little bit. We’ll see in the future flights. Looking forward to adding the wings and the head. But before that will need to find some sturdy metal gear servos which will work with the code…

https://www.youtube.com/watch?v=iOpuezmJpyc
VAALLEON is offline  
Old 08-20-2016, 06:45 PM
  #33  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

Installed the new metal gear servos. They work great. They warm up a little too much but I need to keep the volts up to feed these 5 servos in continuous action.

Installed the first wings to test, which I already had waiting in my junkyard. I am a little concerned with the wing area being small but I will keep the attack angle a little high and see if that compensates. If not, I will need to change the landing gear design and install larger wings.

https://www.youtube.com/watch?v=vdm9squNLS4
VAALLEON is offline  
Old 08-22-2016, 12:24 AM
  #34  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

This is the first setup that will be tested. The elevator and the rudder at the tip of the legs are cardboard at this point, because they will most likely be needed to be cut and re-shaped.

I couldn't find a canopy that I liked so I built one. Should do the job for now...

https://www.youtube.com/watch?v=xp1lKLEJAbA
VAALLEON is offline  
Old 08-26-2016, 03:31 AM
  #35  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

I broke my rule and tried multiple things together. Servo change along with aerodynamic changes. As a result, it took me a while to pinpoint the problems. Finally, a figured it out and had a good flight.



The fact is that the elevator/rudder combination on the legs didn’t sit well. Because of the nozzle design, they got into the airflow and disturbed smooth operation or the nozzles. Also, the servos turned out to be more responsive than the old ones, which caused me having to operate with the lowest P value in the history of Monos.



Now, since I need the elevators and the rudders in horizontal flight, I will need to come up with a solution which will not disturb vertical flight.



Below is the first long flight. Considering that there have been some major aerodynamic additions, it is very good. I felt very comfortable and did a couple of small loops around the park.

https://www.youtube.com/watch?v=YuzY4C_8qrM
VAALLEON is offline  
Old 08-28-2016, 02:57 AM
  #36  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

This is the first flight that I tested transition. As 25-30% into transition, the unit started to lose balance. I think the reason is the lack of tail input into the balance. So, I had to find a better design for the tail wings, which will not disturb the horizontal flight by disturbing the nozzle air flow.

I put the pictures of the new design below.

My other observation was that the unit speeds up very quickly during transition. So, I hoping to be able to control it at a distance that I can see it when the aerodynamics are suitable for the transition.

The flight was pretty good, towards the end I had a little fun, and got some flight close-ups. Vertical flight is very stable and fun.

https://www.youtube.com/watch?v=_5wt...ature=youtu.be
Attached Images
File Type: jpg
IMG_5570.JPG (2.33 MB, 154 views)
File Type: jpg
IMG_5569.JPG (2.49 MB, 153 views)
VAALLEON is offline  
Old 08-28-2016, 07:17 PM
  #37  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

The new face

https://www.youtube.com/watch?v=XHi_xntXzLE
VAALLEON is offline  
Old 09-03-2016, 04:01 AM
  #38  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

I am working on tuning the FC for horizontal flight and finding the right design for the rudder/elevator combination which will not interfere with the nozzle air flow and disturb the vertical flight. I will keep on posting the improvements.

A good flight with the new head. I really liked the looks

https://www.youtube.com/watch?v=2nEbQf5KCkg


VAALLEON is offline  
Old 09-05-2016, 02:46 AM
  #39  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

At this point, where I am dealing with all kinds of problems from servo alignment to resonance, I am judging myself for trying to achieve this hard task one more time.

As opposed to 1 design which I was able to successfully take to horizontal flight and back, I had 5 or 6 different designs that were not successful. And I may be on the route to another failure with this one. Well, at least I made a humanoid fly vertically and can live with not being able to convert into a flying jet…

I am learning a lot with this though. For example, the design didn’t like me to make the servo connections sturdier and whole structure was caught in a resonance shake in the air. So, a flexible aluminum sheet bracket is holding the servos, which got rid of that.

I tested many designs for the rudder/elevator and came up with the correct design which doesn’t disturb the horizontal flight. I also changed the canopy to a smaller version that I really liked… Pics attached.

One problem that I don’t have a solution for yet is that while transitioning, the yaw response is horrible. The unit is barely responding to full stick input. I had this problem with my first unit that I kicked the project off with, which utilized a similar thrust vectoring design. I believe the response will start coming back when it gets closer to horizontal, but then I need to keep the unit straight until I get the yaw response back. Will it still be in sight???

I also need to raise the center of lateral resistance, based on the response that I am getting from the unit…

Very tough project. Hope I don’t end up collecting debris from the field one more time.
Attached Images
File Type: jpg
20160904_180626.jpg (999.4 KB, 136 views)
File Type: jpg
20160904_180545.jpg (995.8 KB, 134 views)
File Type: jpg
20160904_180539.jpg (985.3 KB, 155 views)
VAALLEON is offline  
Old 05-12-2018, 07:13 PM
  #40  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

The new generation prototype that I will build on. I found this to be a very responsive and successful setup. Hopefully some amazing new units will emerge from this concept.

https://www.youtube.com/watch?v=WgmhPDOhesA

VAALLEON is offline  
Old 05-13-2018, 06:50 PM
  #41  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

It’s alive My own little Varitech lives & flies!

Parts from a plastic kit of my favorite fighter Jet of all times F-14 Tomcat was merged with my flying robot. There is still work to do, as I attached the wings and parts with tape and stuff just to test the aerodynamics. I was pretty sure that it would immediately go head down and crash with all the extra surfaces which will interfere with the balance of the unit. But it didn’t.

I got out half a sleep first thing in the morning to do a test before the winds picked up. I couldn’t catch the really calm hours but it was calm enough to test. The plastic parts added some weight and the unit has never been this heavy before.

It flew beautifully. The handling was almost like the additional surfaces has not been added, which means that the additional surfaces are very well balanced. Before the additions the unit was a little too eager to tilt and required me to intervene and correct. I was hoping that the wings would fix that but it didn’t. So, I will need do work on that. I got sun blinded and even made contact with the unit towards the end of the test.

For this 35mm unit, I install everything permanently and do everything that I can to make it look real. I want to try some weathering, too.

This means that the next step is to build a unit that can walk AND transition to a Jet!

https://www.youtube.com/watch?v=5aqFJ_BUnSY


VAALLEON is offline  
Old 05-14-2018, 02:07 AM
  #42  
Don Sims
Administrator
 
Don Sims's Avatar
 
Join Date: Sep 2005
Location: Middle Tennessee
Posts: 12,831
Default

Kewlness!
Don Sims is offline  
Old 05-14-2018, 05:24 AM
  #43  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Thumbs up

Originally Posted by Don Sims View Post
Kewlness!
Thank you sir!
VAALLEON is offline  
Old 05-16-2018, 03:35 AM
  #44  
VAALLEON
MONOPHAN
Thread Starter
 
VAALLEON's Avatar
 
Join Date: Jun 2014
Posts: 344
Default

Here is a much better flight video with some higher speed passes. It’s surprisingly stable when I tilt it for fast forward flight. It holds the angle and speeds up nicely. I want to fly more and understand the flight dynamics better. I broke the canopy in today’s first attempt, where I the genius launched it without activating the accelerometers!!!

https://www.youtube.com/watch?v=DxUtZBXFOr8


VAALLEON is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Joe 1320
Electric Ducted Fan Jets
4
06-03-2013 02:53 PM
M3galodon
Beginners
18
06-13-2011 03:42 PM
peteflys
Electric Ducted Fan Jets
6
03-29-2011 02:07 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Quick Reply: Transforming vtol edf jet drone (varitech) – robotech project


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.11863 seconds with 28 queries