asteroza + rotor   92

Ultimate PROJECT - Results
Boxprop open rotor seemes to use looped propeller blades (like a box wing essentially)
EU  europe  aviation  propulsion  research  technology  GTF  geared  turbofan  open  rotor  diamond  turbodiesel  compound 
7 weeks ago by asteroza
Ultimate PROJECT - Ultra Low emission Technology Innovations for Mid-century Aircraft Turbine Engines
EU engine research, including stuff like open rotors, geared turbofans, and that D-16 turbodiesel compound turbofan
EU  europe  aviation  propulsion  research  technology  GTF  geared  turbofan  open  rotor  diamond  turbodiesel  compound 
7 weeks ago by asteroza
Deakin engineers look to Mother Nature for answers to power problems | Deakin
I wonder if this is a function of Reynolds number effects, so that those whale tubercle wind turbine blades can't be scaled down and need to resort to seagull wing biomimicry...
small  wind  turbine  rotor  blade  design  biomimicry  seagull  wing  airfoil  engineering  research  technology  aerodynamics 
june 2019 by asteroza
RK Transportation | Technology. Driven.
A not entirely insane idea of using a very small electric motor as a replacement for crankshaft flywheels in piston engines. The idea being instead of using rotor inertia in a conventional flywheel for smoothing, use a small electric motor that bursts torque when the piston is at top or bottom dead center to smooth out the output torque. This is not a full (parallel?) hybrid implementation, more like some might call a mild hybrid.
ICE  engine  crankshaft  flywheel  torque  smoothng  electric  motor  rotor  hybrid  automotive  technology  research 
june 2018 by asteroza
MIR | MIR is launching a new UAV design to automate rope access work
Interesting, using 2 xis gymbal for each rotor stack so have full 6 DoF all the time (aside from gymbal-lock scenarios). Should allow high agility, and potentially allowing the body to go vertical.
UAV  drone  quadcopter  multicopter  hardware  electronics  devices  coaxial  rotor  propeller  gymbal  6DoF 
april 2018 by asteroza
FairDiesel Limited
Now this is interesting, using 2 cam rotors to move two pistons per cylinder in a rotary OPOC config. Sorta uniflow as well?
cam  rotor  rotary  axial  OPOC  engine 
august 2017 by asteroza
株式会社チャレナジー | Challenergy Inc.
Magnus effect blade VAWT. Mechanically linked rotation? Allegedly typhoon proof (probably since you can adjust "blade" lift factor by rotation rate to depower the thing)
VAWT  japan  wind  turbine  power  generator  magnus  effect  tube  blade  flettner  rotor 
march 2017 by asteroza
DELFTACOPTER – Delta-wing Electric Longrange Transitioning Autonomous Helicopter
Interesting collective pitch control single rotor tailsitter drone. Ah, but it has "tailrotor" like tip props, so technically a tricopter?
VTOL  biplane  flying  wing  collective  pitch  control  propeller  rotor  UAV  drone  tailsitter  hardware  electronics  devices  research  Delicious 
september 2016 by asteroza
Sandia National Laboratories: News Releases : Enormous blades could lead to more offshore energy in U.S.
Interesting downwind turbine rotor blade design, that feather in high winds by bending out of plane like a palm tree leaf. Though how that bend works is a bit of problem, as it strikes me as a weak point.
exascale  wind  turbine  segmented  morphing  rotor  blade  feathering  downwind  materials  science  research  technology  Delicious 
january 2016 by asteroza
Clarian Labs - Making Ideas Possible
These guys were allegedly working on a compact single rotor wankel generator to be used in a hybrid battery pack. I wonder if this could be used in the Logos Technologies stealth bike SilentHawk?
compact  small  form  factor  single  rotor  wankel  ICE  generator  energy  storage  hybrid  battery  Delicious 
january 2015 by asteroza
Helicopter Could be 'Scout' for Mars Rovers
I would have expected larger rotors, more like one of those human powered helicopters. With the low pressure, you need hugely long rotors.
NASA  JPL  mars  coaxial  rotor  helicopter  space  research  technology  flight  aerospace  aviation  Delicious 
january 2015 by asteroza
Lotus | Joby Aviation
Interesting solution to the "Dos Samara" design's problem of single bladed VTOL rotors.
NASA  VTOL  UAV  drone  design  research  technology  Dos  Samara  split  scissor  rotor  folding  feathering  blade  wintip  propulsion  electric  hybrid  aviation  aerospace  Delicious 
january 2015 by asteroza
Modlab » Archive » Underactuated Rotor for Simple Micro Air Vehicles
This appears to be a reimplementation the keyence revolutor mechanism for swashplateless rotor blade pitch control via motor pulse shifting.
offset  off  axis  hinge  rotor  blade  pitch  control  pulse  modulation  coaxial  underactuated  helicopter  multicopter  engineering  dynamics  keyence  revolutor  swashplateless  UAV  drone  research  technology  robotics  motor  Delicious 
december 2014 by asteroza
silent, invisible, predictable, renewable energy - tidal technology - openhydro
Didn't know DCNS got involved with these guys. DCNS seems to be pretty active in ocean energy work, what with their submarine nuclear powerplant and OTEC work...
DCNS  tidal  current  open  core  hub  rotor  turbine  power  generator  marine  structure  engineering  green  energy  hardware  electronics  devices  underwater  Delicious 
september 2014 by asteroza
Eternal Flight as the Solution for 'X'
Use centrifugally stiffened (fabric?) rotors as a means of achieving very low weight wings. The extreme case being a kind of floppy tip driven helicopter, using solar fabric wings and electric props?
CSR  centrifugally  stiffened  rotor  wing  NASA  NIAC  atmospheric  satellite  stratellite  Delicious 
june 2014 by asteroza
Sagita - Home
Looks like a semi-hot cycle helicopter, but instead of a potentially more complicated tip jet drive, it appears to use dual contra rotating direct drive turbines to spin the rotors, exhausting into the inter-disk area of the rotor hub. That exhaust choice is a bit odd though, but it might increase local air velocity over the blades.
rotor  direct  helicopter  aerospace  cycle  technology  turbine  semihot  coaxial  aviation  drive  hot  VTOL  Delicious 
june 2013 by asteroza
A slightly different take on the stopped rotor VTOL genre, assuming a freefall drop profile to transition, rather than trying to offload lift to the canard/tail and eventually stopping the rotor like the X-50.
aerospace  rotor  canard  wing  technology  UAV  stopped  VTOL  research  CRW  Delicious 
april 2013 by asteroza
Hitachi Drives PM Motor at Low Speed Without Position Sensor -- Tech-On!
Interesting trick of measuring coil inductance via electromotive voltage change to detect permanent magnet rotor position in a BLDC motor without a dedicated position sensor.
rotor  position  control  monitoring  speed  DC  sensorless  BLDC  brushless  detection  permanent  voltage  inductance  low  magnet  Delicious 
april 2013 by asteroza
Velkess - About
Oddball low cost energy storage flywheel, based essentially on the same physics as a cowboy lasso being spun. So, the entire ring/torus/cylinder of the flywheel, along with the "rotor" it seems, is made of flexible materials.
rotor  ring  hardware  Velkess  flexible  devices  kickstarter  flywheel  energy  storage  electronics  Delicious 
march 2013 by asteroza
text_2010_06_24_EngineDesign.pdf (application/pdf Object)
I hate to sound dumb, but why hasn't a contrarotating power turbine set been joined to a twin contrarotating geared turbofan setup in a puller configuration? Is it the cost of the gearing and potentially 3 or even 4 shaft setup to make that possible, compared to a simpler free power turbine direct driving the rotors in a pusher configuration? But a puller config allows putting in a recuperator, something a pusher configuration would have trouble with.
rolls-royce  ultrafan  turbofan  engine  aviation  propulsion  aerospace  research  technology  open  rotor  propfan  Delicious 
august 2012 by asteroza
Plante-Rim-Rotor-Rotary-Ramjet-Engine_High-Power-Density-Continuous-Rotary-Engine.pdf (application/pdf Object)
Doesn't use discrete ramjet channels continuous from front to back, but rather some kind of common combustion chamber in the middle?
SOCPRA  R4E  rim  rotor  rotary  ramjet  gas  turbine  engine  power  generator  research  Delicious 
january 2012 by asteroza
How Audi Hybrids Could Keep the Wankel Rotary Alive - Feature - Car and Driver
Wankels may have died at Mazda, but might possibly come back at Audi for generators in range extender options for EV's?
Audi  A1  E-Tron  series  hybrid  EV  electric  vehicle  automotive  technology  green  transportation  research  single  rotor  wankel  rotary  ICE  engine  alternator  power  generator  Delicious 
september 2011 by asteroza
Strange design. May have merit on the small scale when the rotors don't weigh much, but scaling up is a challenge I would think...
Selsam  SuperTurbine  wind  turbine  power  generator  green  energy  alternative  drivetrain  rotor  layout  HAWT  Delicious 
june 2011 by asteroza
Guided Rotor Compressor
Very similar to a wankel rotor, but apparently not the same, and uses rollers at the apex seals. Hrm, I wonder why wankel rotors don't use cylindrical roller seals for the apex seals?
guided  roller  rotor  compressor  GRC  envolute  trochoid  trochoidal  rotary  positive  displacement  piston  hardware  gas  wankel  engine  Delicious 
june 2011 by asteroza
Oscomp Systems
They're claiming possible 120:1 pressure ratio single stage compression due to key heat transfer method with a water cooling jacket?!? Something about the hybrid rotor combining aspects of centrifugal and reciprocating compressors. Some kind of sliding block to emulate a piston on the rotor itself?
wet  natural  gas  methane  isothermal  compression  research  hybrid  rotor  compressor  expander  positive  displacement  CAES  Water  jacket  cooling  Delicious 
june 2011 by asteroza
Swift Wind Turbine - Home
These guys seem to use a solid rotor ring. Maybe some kind of trick to even out power output from a small rotor device by increasing it's rotational inertia? But wouldn't that make it harder to start in light breezes?
rotor  blade  ring  wind  turbine  power  generator  green  energy  small  form  factor  Delicious 
november 2010 by asteroza
Winflex Wind Turbine
Now this is an interesting concept. Using an inflatable ring, you have a tension structure that's lightweight. The ring probably doubles as a venturi wind focuser as well. I wonder what sort of inflation pressure you need though.
Winflex  inflatable  rotor  blade  ring  wind  turbine  power  generator  green  energy  israel  lightweight  Delicious 
november 2010 by asteroza
VTOL Technologies Ltd
Now if only they got together with Parrot to mix the AR.drone control software with this tilt duct flying wing quadcopter UAV
tilt  rotor  tiltrotor  duct  ducted  fan  flying  wing  quadrotor  quadcopter  helicopter  UAV  vehicle  aircraft  transportation  VTOL  quad  Delicious 
october 2010 by asteroza
Technology | Ener-g-rotors
Claim bearing improvments to tighten the tolerances of a gerotor expander engine, improving performance.
gerotor  trochoidal  gear  rotary  expander  engine  green  energy  motor  positive  displacement  rotor  turbine 
october 2010 by asteroza
Interesting research by the japanese to use a gas generator/ultra high bypass ratio turbine to drive clusters of multi stage recycling tip turbine driven lift fans for VTOL lift.
JAXA  japan  aerospace  aircraft  airplane  research  VTOL  cluster  fan  lift  jet  bypass  air  tip  rotor  multi  stage  multistage  turbine  Delicious 
august 2010 by asteroza
Williams Hybrid Power - Home
Apparently the MLC KERS is functionally a halbach array, with the MLC as the halbach array working against a stationary conventional stator in the case.

And for those counting, this is only a few steps away from the old crank concept of the power wheel, where an external magnetic field supports a flywheel to overcome the strength (tension) limits of the flywheel material...
williams  KERS  electromechanical  composite  flywheel  energy  recovery  storage  system  hardware  electronics  devices  automotive  technology  green  MLC  magnetically  loaded  halbach  array  rotor  generator  motor  Delicious 
may 2010 by asteroza
W2 Energy Corporation - Steam Ray Engine
Seems suspiciously similar to a StarRotor Gerotor in operation, but using some shape tricks to increase available chamber size (seems to have the ability to bridge two cavities in the rotor, but doesn't seem to fully evacuate a single chamber either). Truly a positive displacement engine? See the patent for the funky internal rotor shape.
SteamRay  gerotor  rotary  engine  expansion  turbine  rotor  Delicious 
march 2010 by asteroza
Libralato Engines Technology Overview
A rotary engine design, taking some cues from the wankel. Uses a variable rotor shape to change volume.
Liberalato  ICE  engine  alternative  rotary  piston  concept  design  variable  rotor  Delicious 
march 2010 by asteroza
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