![]() ![]() Any other large frame helicopter base would work fine. This will let you use standard rotor and gear components of the 700-800 class T-Rex RC helicopter and build your proof of concept with the 4 engines. ![]() I would recommend prototyping using 1.6m diam rotors or similar. So aggressive that you'll have to check your shaft torques. On you're gearing you have a very aggressive ratio. You may not even be able to do a low stable hover without both. The clutches in each engine will disengage below a set RPM so you won't have to worry about one way bearings. I am fairly cretin you will need both throttle and pitch adjustment to gain the most efficiency and control. It sounds like you are using 4 engines? That's good in you won't have to transfer power from a central location out to the arms, but it is going to be a control nightmare with 4 throttles and 4 rotor pitches. Some extreme trestle system with thin walled tubes of some form? Quick question, where will you be storing this? With 4m diameter rotors you have a wingspan of 8+ meters which is bigger then a 2 car garage. I am having a hard time comprehending the frame you will need on this. 4m rotors is going to be monstrous and to milk out every bit of efficiency you're going to have to have some separation between the rotor tips. I've got a short clip of the first tethered flight I'll try to post in a somewhat timely manner, but everything after that just has the air frame bouncing around not even trying to be stable. On my end we've been stuck with stability issues for months. Individual rotor RPM sensors with Hall Effect switchesĪmbitious, but a controls engineer might be able to pull it off. Multiple test flights around an hour long Gas Storage- Two Danhakl Design tanks 32 oz eachģDR Pixhawk control hardware (my friends are scrapping the firmware) -or- RoboVero and a Gumstix (we have both hardware but are probably a month out from having a respectable control system).Ī foldable design that fits in a 2'x2'x4' box with 5 minutes in or out Power Distribution- miter gears and torque tubes Servos- Protek 100SS (both for pitch and throttle) Rotor grips- Tail pitch assembly from Align 700/800 series Rotors- 325mm symmetric carbon/glass fiber main blades for the T-Rex450 (as cheep as I can find) Gear Reduction- 17:57 (calculations based off having equal rotor tip speed as RC helicopters with the same engine) I'm at least proud to say that after test two I am only waiting on two pairs of rotors in the mail.Ĭontrol system- Arduino Uno and potentiometer with a spool of speaker wire in between (remember, mechanical engineer) Lets just say that there are dozens of bolts that individually keep bad things from happening and it only takes one missing Loctite to vibrate out and let the bad things happen. Must have been too high pitch for not enough throttle. The burning turned out to be the clutch pads, which were entirely gone. It was more then happy to to fly at the end of it's leash (which I made too short for it to hang itself) for 20 minutes before I landed because I smelt something burning. This picture was taken on and was my first full system test. I have plans on selling these to farmers and other researchers some day but in the mean time I want to to lend my experience to anyone attempting a similar build and would like to see all those people who have started these builds to be able to finish. I am a mechanical engineer and am working with a computer scientist and computer engineer who have their own equally ambitious plans. ![]() To the best of my knowledge this is the first successful gasoline powered quadcopter. Since as of 10 months ago I did not even know that existed I decided to wait until I could show up with my proof of concept. At the time and since then I've come across many blogs, discussions, pictures, and videos of people who have tried this kind of build and only one or two videos of anything remotely proof of concept ( a nitro and an electric single engine/motor variable pitch build that simply made it off the ground). It all begin with design requirements of a quadcopter with a 10 pound payload for a one hour flight time and ended up with a gasoline/variable pitch build. Heres a "little" project I started a little less then a year ago. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |