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New Frame Concept CFP - T Mark-03

crlock

Senior Member
#1
Hi guys, this past few months i've been working on a tricopter concept a little bit different.
The ultimate goal of this frame is to be able to have different COG's in one platform. Wether it is for fpv, or stunts.
I'm not the best of pilots, in fact i'm still learning to fly multirotors, so i could not be the best of judges to decide if it is a good flight platform or not, i'll leave that to you guys ;)

this is the mark-02, here are the three positions of the arms. Normal - High - Low COG

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The revised Mark 03

The material here was pretty weak, i think you call it plywood (terciado aquí en chile) so i needed something stronger and stiffer, the plywood began to get crooked with time and temperature changes. Enters the Carbon fiber.

I loved it, Super strong, and relatively easy to work with. much more heavier than the plywood, of course because of the thikness i went with. 3mm is too much, for the next frame, i will use 2mm, and i think that will be more than enough for my needs.

The overall weight ended being around 1300 grams (3lbs), with everything on it 3S battery and gopro.

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This is the vibration dampening system i designed using sophisticated materials and stuff and rubber, never underestimate the power of rubber bands :cool:
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As soon i have onboard footage, i'll post some videos of the dampening system.

The switch to power the board, simple elegant and very handy
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Landing pads, not the most sophisticated, but works great :)
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The belly of the beast, the battery fits very nicely and you can move it forward or backwards if you have the gopro installed or not.
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Yaw mechanism, very simple and designed to protect the servo. if you crash, the connecting rods simply snap away from the moving arms, and you save your servo

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and a video of the rig flying. i have not set up the self level on the KK2 board yet, tomorrow i will, maybe it will be even more stable :)


Hope you guys like it, i'm fixing a few bugs i found, i will post the plans once i have them finished. Stay tunned

Cheers
 

colorex

Rotor Riot!
Mentor
#3
Cool, man! I think it could be useful like for hanging a camera gimbal underneath it, you could really fine tune the vertical CG!
 

crlock

Senior Member
#4
Definitely a novel design. I want to see a version where the modes can switch mid-air. ;)
it's on my mind trustme, i need to figure out how to lock in place the arms, currently i do it with a pin, i need something more sophisticated than that jejejje
 

crlock

Senior Member
#5
I'm a little pist off, the motors i bought are garbage, NTM Propdrive 2830 - 800 kv. i bought 3, one came with bad bearings right out of the box (bag in this case) and a second one just blew the bearings a couple of minutes ago. i fired the tricopter up, and noticed a faint clicking sound from the motor, didn't pay enough attention, and two minutes later the sound was very loud, upon further inspection, bad bearings.... i have two more motors on the way from hobbyking, im praying to the gods of flight, that they have better bearings than this ones.
do you guys have any advice on decent motors? i'm looking on the 800-1000 kv range.

Cheers
 
#8
I fly BP Hobbies Cheetah, Keda, SunnySky, and Tiger Motors. I like them in that (increasing) order. SunnySky especially seem to have great quality at a reasonable price.
 

crlock

Senior Member
#10
Unique idea for a frame.

That much 3mm CF must have cost a fortune. You can probably drive a car over it with no damage!
fortunately not that much :) only 98 bucks for two 400x250x3mm plates it's the cheap chinese one, good quality though, but it's heavy as a tank, the frame alone weight 400 grams. the MK4 will have thinner and less CF, aluminum joints and better landing pads, and an option to mount a bigger camer underneath.

The joints i'm using now are made from instamorph, and have way too much play when i have a rough landing (wich is most of the time :p), so i have to constantly reset the arms position.
 

Cyberdactyl

Misfit Multirotor Monkey
#11
:applause: I spotted the instamorph right away. But I thought you were the same guy that did the other yaw mech, so I didn't mention it.
 

crlock

Senior Member
#13
I forgot to mention, i took the idea from Ghost recon FS and the Recon Drone, here is a pic.

of course that dron is equiped with emp grenades, frag grenades and heat vision. i have to settle with gopro vision :p
grfs-drones2.jpg
 

Cyberdactyl

Misfit Multirotor Monkey
#14
I have a little experience looking into articulated arms, A few years ago, I did a "re-imagined" turret for an old PC game from the late 90's called 'Battlezone'. I tried to give a whacky concept a much more 'hyper-realistic' look and function.

One thing that can be done to obtain rigidity, is to put a skewer or thin CF tube from hinge to hinge and somehow have one hinged but locked and the other end able to slide, then lock into position. Or a smaller opposing hinged arm, but that requires too much added weight.

 

crlock

Senior Member
#15
I have a little experience looking into articulated arms, A few years ago, I did a "re-imagined" turret for an old PC game from the late 90's called 'Battlezone'. I tried to give a whacky concept a much more 'hyper-realistic' look and function.

One thing that can be done to obtain rigidity, is to put a skewer or thin CF tube from hinge to hinge and somehow have one hinged but locked and the other end able to slide, then lock into position. Or a smaller opposing hinged arm, but that requires too much added weight.

i was thinking of something along those lines, but to be automated it would need at least 6 extra servos, not to mention something to control those servos, or maybe motors to drive a screw , i don't now its name in english, we call it "sin Fin" or without end. to move the arms into position, but the added weight would be tremendous.
The chalenge here is the automation, something strong enough to handle rough landings or crashes, and capable of maintaining a position despite the thrust of the propellers, fast enough to switch betwen modes and, light weight.


i devised a pretty nifty landing gear, this weekend i will be testing it =D you guys will love it
cheers
 

xuzme720

Dedicated foam bender
Mentor
#17
if you could find some light enough, linear actuators would be awesome! They are basically a jack screw driven by a motor and could stop anywhere and be strong...
 

crlock

Senior Member
#18
I did a couple of adjustments to the frame design, to save weight and a better locking system for the arms, I ordered a thinner CF plate and aluminum parts. Unfortunately, the post office is on strike, so all my parts will be delayed at least a month T_T

In the meantime, i'll do a simplecopter build with some spare parts i have laying around :)