crystal garris's Posts (61)

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100KM

techpod EPO foam

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Ok , this is what i've been up to for the past 6 months besides ignoring my family working and getting little sleep . took me about 300 hrs of CFD time on my cluster alone plus a whole lot of  cad work .the flight surfaces are well trimmed through the earlier iterations of the early techpod .I found the airflow around the bottom side of the wing root towards the tailing edge very turbulent forming a large "bubble' illustrated here 

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this would seem endemic to this aircraft configuration . I was able to eliminate it by reiterating the fillet and wing root area and slightly increasing the incidence . I was able to get the drag down to about .8 lbs @ 60 mph

I have a prototype on order and should be receiving it in about a month . and here is the part where you come in . if all goes well with the prototype i can order a large batch . Only thing is the minimum order comes to $40,000  . I work for a living so i don't have that kinda scratch . I do have about $15000 saved up however . anyway , I;m thinking about using kickstater.com . I would like to get a feel for how many people may be interested in pledging . the kits will go for about $250 retail and i will have ready to flys as well pledgers will get a deep discount.throw me a pm or give me a shout here if your interested . I will post pics of it as soon as it comes in .here  are the specs 

  • Cruise Speed: 32knots
  • Max speed – 55knots
  • Climb Rate – 2000 ft/min
  • Wingspan = 105 in
  • Fuselage Length = 45 in
  • Dry weight = 2.75 lbs*
  • Max loaded weight = 4.4lbs (1.65 lbs of battery/payload)
  • EPP Wings and Tail Contruction
  • Carbon Fiber Tail Boom and wing spars

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100KM

techpod 2.0 progress blog

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This is my official blog for the progress on the techpod 2.0 . I have posted some design pictures here . this is the first try at a frame for it .clearance between camera and dome look great no problem getting 180 deg of travel on both axis . the only problem is the servo proves be to wobbly by itself so I'm going to whip up a solution . I have the new design just gotta go cut it out in the CNC . will post the results . you can learn more about the techpod and purchase the 1.0 version at evuas.com .
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100KM

EPP covering technique " the new stuff "

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Expanded polypropylene is highly desired for fabricating small remote control airplanes and uavs . Its high impact stability low material cost and low weight makes it very good for this role . However the two main ways of manufacturing parts from the raw material have drawbacks . Molded EPP makes a great finished product and can be produced in many shapes including compound curves and can have a smooth finish. the major drawback is the high cost of producing the molds and the production machinery. The other method used is hot wire cutting . the start up cost is much less expensive, however it cannot produce compound curves and the finish is very rough, which can produce unwanted drag in an airplane design.


Wanting the best of both worlds , I came across this blog on what has been termed " the new stuff ". I ordered a couple roles and began playing with it when it arrived. I was very impressed and decided to use it on my next version of the techpod it went on like butter , very smooth , easy to manage wrinkles and adds much structural strength to the EPP. over all this technique is about the same weight per square inch of wing as molded EPP.

I am very please with the outcome and very happy to share this with the hobby uav community at large.

Read more here http://community.evuas.com/pg/blog/EVUAS/read/205/epp-covering-technique-the-new-stuff- and yes i will be offering small quantities at good prices on the EVUAS store soon
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100KM

techpod1.0 ready to ship

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Here is what you get


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including :

EPP wings and tail , carbon fiber tail boom , CF wing spars , CF joiner , CF tail spars , CNC cut aircraft grade plywood , polycarbonate front and rear lids , 1/4 turn fastener for front lid , acrylic camera dome , ABS molded engine cowl , all push rods , control horns , balsa sheeting and stock , all needed screws and assorted hardware .


Not included but recommended running gear


motor : E-flight power 10 brushless in runner

ESC : castle creation thunderbird-54

Batteries : thunderpower pro light v2 3S 2600 mah x2 wired parallel

servos : 2x hitec HS-81 (elevator,rudder) 2x hitec HS-55(2x ailerons) 2x HS-5055mg (pan,tilt)

TX & RX Spectrum DX-7

Prop : APC E11x7

camera : CCD Killer Camera Micro NTSC Camera

as of this posting there are only 4 left from this run . the material for 20 more is on the way . will be available in approximately 2 weeks


for the latest news check http://evuas.com

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100KM

Techpod 1.0 beta

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SPECS:

cruise speed - 27knots

max speed - 55knots

max weight - 4.4 lbs

flight time - 1 hour+

climb rate - 2000 ft/min

features :

EPP wings and tail

carbon fiber tail boom

clear lexan ,fully removable top hatches

clear acrylic "camera quality" dome

pan/tilt camera mount

retail price will be approx $150-$200

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100KM

Evolution = change or die

Hello everyone - again
my activity on this site has been low for the past year as i have been up to my ears with starting a business and developing a few products for us to sell . I would encourage anyone reading this to take a good long look at my profile so as to understand my background and my history with the diydrones community .

As most are aware , the only true constant in life is change . However the rate of change would appear to be on the uprise . most of us at this point either have lost our jobs or at least know someone who has . This in turn has a ripple effect on the economy , not just as a whole but an individuals economy . The effects of the present state of the economy have been effecting the world of open source . this can be demonstrated very easily by noting Blogs such as Chris's "update on product availability " , the disappearance of projects such as open pilot (I've been trying to contact the team with no success and the latest activity was back in June . if anyone has more info please let me know.). Lets face it , its hard to develop complicated machinery with no capital.

the future of open source autopilots are not guaranteed . as with everything in life open source autopilots are going to have to change or die . OSAP (open source autopilots) have been facing many problems from all sides .
These include but not limited to government regulations , inter-OSAP competition , bad economy , "race to the bottom" mentality , "open source = no $" mentality , no single self regulation entity (AMA for UAVs),and many other fears and misconception held by the public at large and OSAP developers.

The question at hand is this : how can OSAPs change so as not to die ?

I believe the answer is to draw from the strengths that both "open source" and "commercial" auto pilots enjoy

#1 co-operation . as individuals we will be broken one by one , If we join forces we can be unstoppable
#2 commercial viability . the most successful open source projects have commercial applications . no income = no output.
#3 self regulation . Ive been told directly from FAA officials and can be read here ARC.pdf . we have to self regulate or the government will be stepping in .
#4 we , as a whole , need to stop making decisions based on fear . logic yes , fear no



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100KM
EVUAS = EVolution Unmanned aerial systems

Introducing the next evolution in servo control : the opto flight !


there are many advantages to using fiber optics over conventional copper.
these include :
- 100% RFI proof
-complete electrical isolation between RX and servos (excessive current draw from servos will not cause battery voltage drop possibly leading to RX brown out and loss of control)
-no inductive feedback
- can use 5cell batt for RX while using 7.4v lipo unregulated with new high voltage servos .
-boards can tolerate up to 18volts dc

kit includes :
1x receiver board
8x servo boards
1x 10ft fiber optic cable
20x fiber optic cable terminal connectors
1x terminal polishing kit

learn more at www.evuas.com/index.php

18 units available for pre-order . shipping august 20th .
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100KM

NW AUVSI con

held Friday sept 18th , about 24 people showed up .representing places like Insitu ,near space corp ,cloud cap,nwuav propulsion ,hood tech corp ,nw tech,evergreen helicopters , arcturus,Peak-Aviation and In Vitro aviation. It was held at the beautiful Hoffstadt Bluff Visitor Center near Mt St Helens in Washington .Things kicked off at 11:00 am ,Joe from NWAUV acted as mc . Joe started off talking about how the chapter is being formed etc with some informative Q&A he then talked about NWUAV and showed off their engine and models he also talked about the heavy fuel injection system they are working on for their engine line up. It uses MEMS technology originally designed by HP for printing to atomize the very hard to burn heavy fuels .After that we all stood up one by one and introduce ourselves then it was time for some mingling and lunch . After lunch the guys from Near Space did a slide show with videos on some of the high altitude uav drops they have done , we are talking 150,000 ft altitude , very cool stuff .Aram from Hood tech then spoke about hood tech and his efforts to get kids involved in robotics using lego mindstorms and of course he was very excited to hear about Chris's lego auto pilot . After that we talked more about forming the chapter ,people volunteered for the various posts and we decided on a name we picked "the Cascade chapter" although "the Sasquatch chapter" was in the running. Thing wrapped up about 4:00 then it was time for the drive home. here are some pics I took ,I really liked the variable pitch prop.

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100KM

Open airframe

Dev photos for Open Airframe , an open source airframe i will be publishing based on THE EZG

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MADE OF:balsa , plywood ,1 EZG kit ,CF tail boom and a couple 2 litter coke bottles for the clear plasticthe holes along the side are for mounting modular equipment racks that can slide in from the top.
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100KM

How to get a COA

well the best way is to find a university interested in uav research , and make your self available to do demos, you usually have to foot the bill yourself but its a great foot in the door. also call your local government services . the trick is to get in with a major university or a governmental agency . after that its really between them and the FAA .but one thing everyone has to understand is that this is serious stuff , our A-3 retails for $75,000 . every time i fly i understand that peoples lives are on the line . this type of job is not for everyone , it is very high stress and mistakes cant be made . just to give an idea about what it takes , we have spent well over $250,000 over the past 2 years and we are just now starting to get some income . so if you have an extra $ 1/4 mil sitting around , can do without if for a few years and are willing to risk it all in what amounts to an overblown r/c monster of an airplane with a 3/4 second control delay this just might be your line of work.so to sum up#1 lots of $#2 fly huge , very expensive airplane or even a small , very expensive airplane#3 get some form of government help (dont be afraid to crack open a phone book and look at the blue pages and call people !! )#4 i have found that most government agencies want big payloads , high altitudes and all weather beyond-horizon abilitygood luck to everone and above allHAVE FUN !!!wayne
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100KM

BasicX auto pilot

This is a journal for a BasicX AP I've been working on for the last month:i received my BasicX processor the first week of April and spent the next week pounding out the code .i then spent the next week simulating and adding a few niceties like way point and setup files.the next two weeks was spent waiting for the gps module and other parts .spent the last week making a proto board and a few changes to the gps parser to work with the gpstoday 5-5-08 first test flight : things went very well and it performed better then expected (wee haa!!)ok a few features of my ap:no distance restrictionscan fly any ware in the worldunlimited WPseasy set up file ie trim,ectuses spherical geometry in the nav routine instead of flat plain approximation5-8-08test fly ; changed "P" to 0.5 with very nice results flight path much straighter between wps5-9-08hardware list1x ettrex 32 cannel 5hz gps modual1x BX-241x DE-SWADJ reg from dimension engineering1x 5v LDO reg3x 0.1 uf caps1x 100 uf cap2x 1k ohm resistors1x parallax servopal1x tact button (reset)staight pin connectors1x small perfboard1x fma FS-8 failsafe reciever and copilot (stabilization)5-16-08changed gps serial comm , pumped up to 5hz update looptest flight went good ,some oscillations in yaw5-17-08changed cg ,changed prop to 10x7 ,cg got rid of yaw problem , flew in 15-20 mph winds , worked better then expected , noticed 35 deg + dog tracking on cross wind leg, no missed wp no "turn arounds"will turn up P slightly untill it oscillats and will try Ziegler-nichols method on PID loop5-18-08 flew for 15min "no hands" burned 750 ma noticed some trubble turning left against wind5-19-08 changed to figure 8 pattern, changed gain to 0.75, little left trim in auto mode, flew for 10min before rain5-21-08 demo flight for snohomish co. search and rescue. went well
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100KM

propeller auto pilot

here is the code i have to date it uses the proto board and the Hitachi H48C Tri-Axis Accelerometer Module.started with code by Paul Hubner . works good but cant get passthrugh to turn of .not much time but should get to fixing it soon.plan on using the Kalman filter object with an imu soon as well

Download mainuav.spin

Download pass rc reciever.spin

also need "BS2_Functions[1]", "FullDuplexSerialPlus","Servo4",&"H48C Tri-Axis Accelerometer" from the parallax object library

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