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to compensate for the eccentricity of the shaft with the rotor mass. The main structure is aluminium while the rotor is iron. Woelfle Jnr remarks that the thermal expansion properties of an aluminium rotor can play havoc with how smoothly it operates within an aluminium housing, hence the choice of iron. “In aviation, piston engines can suffer problems such as cold seizures, especially during descent when you reduce the throttle but you’re still flying very fast and the cylinder contracts around the piston and grips it,” he says. “Using an aluminium housing and an iron rotor, there is no such danger of seizing.” The rotor is machined from solid. “Most is done on one machine in several steps, so we don’t add tolerances from repositioning the rotor on different machines,” Woelfle Jnr says. The meshing stationary and rotor gears are both made from high-strength steel, to prevent any form of distortion or flexing at higher operating speeds. However, Woelfle Jnr says that has been much less of a risk at the sub-7000 rpm used in the UAV engines compared with the kart engines, which repeatedly spin at up to 10,500 rpm and are then braked to near zero. Engine structure The main structure consists of two end plates sandwiching the rotor housing, the interior of which forms the trochoid surface. To save cost on the amount of machining needed, these are all The Aixro UAV engine uses aluminium end plates and steel gears TAKE YOUR DESIGNS FROM INITIAL CONCEPT TO HIGH-PERFORMANCE REALITY. ACCELERATING UAV R&D OUTPERFORM THE COMPETITION CONTACT TOTALSIM US AT 614.255.7426 OR [email protected] TO LEARN MORE. AERO TS Aero is a web-based application customized for the aerospace industry. Cost-effectively perform highly-accurate computational fluid dynamic (CFD) simulations on aircraft, UAV, drone and multicopter designs. U p l o a d 3 D C A D g e o m e t r i e s . S e l e c t t e s t c o n d i t i o n s t o s i m u l a t e . V i e w r e s u l t s . R u n t h e s i m u l a t i o n . Highly accurate Repeatable results Secure data storage Automated processes User-friendly Fast, powerful processing Flexible geometries Customizable KEY BENEFITS IDEAL FOR REMOTE WORKING! C M Y CM MY CY CMY K UST-Jan-2020-Final.pdf 1 04/02/2020 20:26