TITAN Tricopter Part 3: Build and Fly!

by Zpack | July 2, 2013 | (19) Posted in Projects

Alright guys, the TITAN is complete and flying! Here are some of the last steps that I took to get it finished. A quick note on the pictures- I’ve been constantly refining the design so the pics are a bit inconsistent and there are some features I have added since these pics were taken.

 

If you haven’t seen the other parts then check out Pt1 and Pt2 in the related articles below.

Here is what I decided to do for the booms. My goal with this whole project is to make a tri that is as close to indestructible as possible. A lot of people use wood booms because they are cheap to replace, but I didn’t want to go through the hassle of replacing them every time I crashed. After doing some forum searching, I saw this method; A carbon fiber boom with a wood core.

This may seem like a strange combo, but it makes a lot of sense. Carbon fiber has very high tensile strength, but not very good compressive strength. If you have ever broken a hollow carbon fiber rod then you may have noticed that the normal failure mode is the inside of the bend crushes, while the outside of the bend remains relatively intact. This is due to the fact that when you bend a rod, the inside of the bend is under compressive load while the outside is under tensile load, a carbon fiber rod will fail on the inside of the bend first because it has less compressive strength. This is where the wood core comes in- wood has a much higher compressive strength, so when the boom is bent; the wood supports the interior of the carbon fiber and transfers a good deal of the compressive force from the inside of the bend to the outside where the carbon fiber can handle it as tensile force. The wood is also very light, so the combo of the two combines the best of both.

I used 10x10mm carbon booms with an 8.5mm hole in the center, this is the standard as far as I can tell. A 5/16” wood dowel fits perfectly with just enough clearance. I used Gorilla glue to bond the two- the reason for this is that Gorilla glue is a moisture cured urethane, meaning it can cure without air. This is important because the center portion of the boom is too far away from air for a solvent based glue to dry properly. Another reason is that Gorilla glue expands as it dries to fill any voids- plus it is super strong. I started by cutting my carbon to length (13”), then I cut the dowel about 4” longer so that it would fit all the way through with extra sticking out on both ends. I moistened the wood to activate the glue then I slathered the dowel, before I inserted the dowel into the carbon I placed a good pool of glue inside the carbon so the inside would be coated as the wood was pushed in.

Here you can see a couple of the booms left to dry, the one on the left has been sitting for about five minutes so the glue has started to expand. I used paper and masking tape to keep glue off of the outside of the carbon.

 

Here is a dried boom with the masking tape removed. You can see how the glue expanded to fill the space left by the masking tape. I think I over-moistened the wood because the glue expanded more than I expected.

 

Here is the end of the boom after the extra wood has been trimmed off and sanded. Looks good to me!

 

My motor mounts are designed to be held on only by zip-ties, however the carbon fiber is really slick and the mounts could slide off the ends pretty easily. I didn’t want to use foam tape to secure my motors because when the do eventually pop off in a crash I don’t want to have to get the old tape off before re-installing them. My solution to this is to slide a piece of silicone rubber tubing over the end of the boom- this gives a really grippy surface for the zip ties to grab on to and helps just a little with vibration dampening.

 

Here is a picture of the motor mount with a motor installed- not much too it.

 

I machined the standoffs for the electronics cover out of 3/8” delrin rod- here I am machining out the slots in the center to reduce weight.

 

Here are the completed standoffs.

The landing gear has been redesigned several times, I decided to add a vibration-isolated GoPro mount so I needed taller gear, then I was having issues with the frame oscillating with the yaw mech when it was on the ground. I solved this by adding a brace perpendicular to the gear- it really stiffens them up without adding much weight. The two parts are held together with two zip-ties.

 

Here you can see the tabs that interlock to stiffen the assembly up.

Cutting the frame out on the laser- I love the smell of laser cut plastic in the morning!

The pictures and video you see of the completed frame have an older design of the camera mount. I used vinyl tubing to suspend the platform below the frame- which worked really well for removing vibration, but it was a little too loose and wobbled in fast forward flight (you can see this in the video when the camera is looking back on the frame). The new design reduces the length of the tubing and places the battery under the platform- this is working excellent and I should have some pictures and video up soon to demonstrate.

 

Here are some pics of the yaw mech- very fast and VERY tough

 

The boom retainers have been working perfectly! They hold everything nice and tight but pop loose in a crash.

 

Here you can see what would happen in a side-on crash. The front booms can rotate forward and the back boom can rotate as well- absorbing energy.

 

Here is a pic of the underside, the camera mount can be installed or removed with 4 screws.

This thing is working great. I’ve crashed this thing over and over and haven’t had to replace anything but props. After about a dozen crashes (some very hard) I’ve only had to replace about $10 worth of parts! I’ve gotten such a positive response to the design that I decided to start selling the frames and components. I’m still putting together inventory but be sure to bookmark www.fortisairframes.com because the kits will be available in the next couple of weeks!

 

Here is a flight demo, more videos and articles will be coming soon- stay tuned!

COMMENTS

DeValk on July 4, 2013
Very nice count me in. What size silicone tubing and o rings did you use on the booms just wondering so I can get some before I order my kit. Or will they be supplied in the complete kit?
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Zpack on July 4, 2013
The kit will inclued everything you need except electronics and cable-ties; there'll be a few spares in there too :-)
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DeValk on July 4, 2013
Excellent I look forward to it. What motors are you using in yours?
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Zpack on July 4, 2013
Im using the NTM Propdrive 28 1350kv from hobbyking. I think i got a bad batch because these have really loose and noisy bearings, however i got one recently that was nice and tight. It doesn't seem to effect the peformance though.
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DeValk on July 4, 2013
Last question I promise, did the motor come with the bolt on prop adapter ?
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Zpack on July 4, 2013
No, it is part of an "accessory pack" which is a buck or two more. Also you have to cut off the standard shaft because it comes out the wrong end :-P. They have a short shaft version but it has slightly different specs.
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Corsair2014 on July 5, 2013
very nice! i love the interesting camera angles in the video too
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tsbanking on July 3, 2013
Very Nice. Superb craftsmanship!
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Zpack on July 4, 2013
Thanks!
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Hugo Wilding on July 4, 2013
That is very impressive, I must say! When i first saw some of your plans i was a bit sceptical, but you have created a well thought out piece of machinery, I was absolutely amazed by the footage in the video. I am wondering if you will sell/ make available the plans, for us who have access lazer cutters? Keep up the great work!
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Zpack on July 5, 2013
Thanks Hugo! I have been considering making the plans available for purchase, I do have the capability to do FTP on my site...
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Res7 on July 3, 2013
What sort of ballpark are we looking at on these great little tricopters?
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Zpack on July 3, 2013
I'm still getting the costs figured out (taxes, overhead, blah blah...) but it looks like it will end up around $50-60 without booms, $80-90 with booms (the booms are really expensive to make)
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Res7 on July 5, 2013
Provided shipping to Australia isn't too expensive I'm in.

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Zpack on July 6, 2013
I was shocked to see what the overseas shipping rates are. UPS and FedEx want $140 to ship this little box! USPS has an option for $45, and if I can fit it all in a small enough box then possibly $25. Ill do whatever I can to make it cheap!
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TOOTH on July 4, 2013
Sweet rig and well designed, are you taking wait list? If so add me to it please!!!
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Zpack on July 4, 2013
Go to www.fortisairframes.com and sign up for the newsletter at the bottom of the homepage- I'll send out an email when the kits are available, Thanks!
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AndyPants on July 4, 2013
Wow,I am thoroughly impressed! Excellent work, beautiful results.
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Zsar on July 5, 2013
Is this frame compatible with 1/2" booms?
It will be nice to use the wooden ones :)
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Zpack on July 6, 2013
At this time, no. The arm retainers need to be sized specifically for the booms- which are 10mm right now. I will be offering inexpensive 10mm wood booms as well as the carbon hybrid ones.
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Zsar on July 6, 2013
I see, well the booms that you are going to include with the kit look very sturdy and also the rubber band mechanism on the front arms is pretty clever, that way, in case of a crash (god forbid) it can prevent the booms to break.
I signed up for the newsletter on your website :D
I'm looking forward to get a kit when you have them available!
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Zpack on July 6, 2013
Thanks Zsar! The Hybrid booms are amazingly strong- Ive got about 15 crashes on the prototype (in fact I just crashed again a couple hours ago) and the booms don't even have a scratch!
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Zsar on July 6, 2013
Just for curiosity, what will be the price for the whole kit?
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karlu007 on July 5, 2013
hello zpack when are we going to see your site open for sale? will you ship to australia?
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Zpack on July 6, 2013
Hopefully the kits will be ready the week after next. I will be happy to ship to Aus, but I was shocked to see what the overseas shipping rates are. UPS and FedEx want $140 to ship this little box! USPS has an option for $45, and if I can fit it all in a small enough box then possibly $25. Ill do whatever I can to make it cheap!
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timhg27 on July 24, 2013
hey i woul like to know what remote you use and also the setup thanks

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Zpack on July 24, 2013
I am using a Spektrum Dx8, although it is probably overkill. Here is a link to my setup: http://www.fortisairframes.com/suggested-electronics-for-your-titan-tricopter/
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timhg27 on July 24, 2013
thanks quiet impressive

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StoneBlueAirlines on July 24, 2013
Zpack,

Would love to do a featured video on my youtube channel of your stuff if interested you can pm me. Awesome job.

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kah00na on August 4, 2013
That battery looks large. Is that a 5000 mAh 3S? I would think that tricopter would have a hard time carrying it but apparently I'm wrong. Interesting.
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Zpack on August 4, 2013
It's a 2200mAh 4s, I get around 6-8 min of hard flying (75-100% throttle all the time) and 8-10 min of cruising
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kah00na on August 4, 2013
Nice, I use a 4S 2650 (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16694) but the one you have just looks more square to me on the end I guess. I like this tricopter.
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Zpack on August 4, 2013
Thanks! Check out the kits at www.fortisairframes.com -we're out of stock at the moment but they will be back up next weekend.
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MikeYYZ on October 21, 2013
How do you install the control board? Do you drill holes or do use a different method? !
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Zpack on October 22, 2013
I either use velcro or foam tape (gyro tape), I never recommend screwing your flight controller to the frame because it transfers high-frequency vibration to the board, even if you use plastic fasteners.
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MikeYYZ on October 22, 2013
Thanks. I'm looking at buying one after i completely destroy my quad. Great design by the way.
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Zpack on October 23, 2013
Thanks!
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henry_nator on May 27, 2014
What motors, escs, proppellers, and batteri are you using
looking good ;)
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Zpack on May 27, 2014
For my acro setup I use SunnySky x2212 1400kv motors, 8x4.5" slow-fly props and a 2200mAh 4s battery- this runs for about 8 minutes of hard acro and around 10 for cruising. For my AP/Slow-fly setup I use SunnySky x2212 980kv motors, 11x4.7" slow-fly props and a 3000mAh 3s battery- this gets me about 15 minutes with a GoPro attached.
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JohnMc on August 22, 2014
Hi, i recently made a f450 but i would like something a bit more acrobatic and making a tricopter looks like the way to go. can some recommended a good setup for me, i would like to do some acro but also the option to do a bit of FPV.
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Zpack on August 23, 2014
I recommend the 'Best all-around' setup on this page: http://www.fortisairframes.com/tested-titan-tri-setups/ Let me know if you have any questions!
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JohnMc on August 24, 2014
It looks good, the ss x2212 980kv are great i am running them on my quad at the moment. do you know how this would fly compared to the TBS disco. Also it says to run the motors with 10x5 graupners and 4s. how do the motors handle this because they would be running a bit over the limit.
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Zpack on August 24, 2014
The SunnySky's are awesome- definitely the best value for money. The 10x5 Graupners don't load the same as a slow-fly prop, I wouldn't do a 10x4.5 slow fly on a 4s but with the E-props I can run at 75% to 100% throttle for the whole flight and they will only be warm to the touch.
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JohnMc on August 24, 2014
sorry for all the questions but it says up to 16 min flight time, is this with fpv gear and a gopro. if not what flight times could i get with this gear.
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Zpack on August 27, 2014
This flight time is without camera gear, adding a GoPro and FPV gear would drop it down to 10-12 minutes. If you are more concerned with flight time then maneuverability, then I'd go with the SunnySky x2212 980kv motors, 11x4.7" slow-fly props and a 5000mAh 3s battery. You can get around 18 minutes with this setup with a GoPro.
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TITAN Tricopter Part 3: Build and Fly!