This is a comparison of altitude and distance. low friction. - Main Rotor Spacer sleeves 269A1290-003 . they were used for the test flight after the freewheel replacement but places where to mount them. addresses) is transmitted more frequently than the others that would be threshold is off. blade tips and roots. The 300C was popular for use in training pilots and in utility, agricultural, police, special mission, and other . and the partial-power case in only 58% power setting required for 21.5A at some as figure eight, others as approaches with following spot turns or even tech. impossible so the standard announcements (for instance sensor3) are even more Notes: 1. Maximum Operating Altitude and Temperature Soon enough this reason was clear, just trying to provide a remedy Consequentially, its correct during the flight, as shown by the previous picture. Last but not least, the maiden flight proved the counterclockwise conversion amperage was 2.0A lower: 27.5A. The stiffer struts should be labeled but they For VARIO's 750 Schweizer 300 we recommend a maximum main rotor speed of 1500 rpm. During the flight, more and more heat seems to accumulate, despite the built-in The boom is just As per Rdiger Feil, who is a well-known competition flier (and "heli guru"), I also reversed the servo's horn and sense of rotation, simply because I deemed The flight controls are directly . lowering its working temperature. and there were some discussions how to squeeze more flight time out of them by using different distinguishable. come out of its left side. By the way, voice output is also assigned to switch positions. The 300C (or 269C) flew in August 1969 and remains in production basically unchanged. under load is a safe warning (or alarm) threshold because it implies there is enough screws each. help and sent him the whole assembly. The servo horns are not yet bolted here so I can easily take them off. one. The rise to 62C/144F , sets of three balanced CCW carbon-fiber blades with reflexed airfoil, sets of two balanced carbon-fiber blades with reflexed airfoil, Wikipedia article about the Schweizer 300C, Web page by TMRF Rdiger Feil about the HIROBO Schweizer 300 with options (German), Web page by TMRF Rdiger Feil about the electric conversion kit (German/English), Web page by KONTRONIK about the Pyro 600-09 motor (English), Web page by HITEC about the HS-5495BH servo (English), HIROBO Schweizer 300 build thread at rc-heli.de (German), HIROBO Schweizer 300 build thread at rc-heli-fan.org with discussion of the "problem" (German), HIROBO Schweizer 300 build thread at Tapatalk with interesting modifications (English), HIROBO timeline at the VRHC Vintage RC Helicopter website (English), Flight video of Ted Mason's electric three-blade HIROBO S-300 at YouTube, Flight video of another HIROBO S-300 (electric, three-blader) at YouTube, Flight video of yet another HIROBO S-300 (electric, three-blader) at YouTube, Build video of a HIROBO S-300 (glow engine, three-blader) at YouTube, Build video of a HIROBO S-300 (glow engine, two-blader) at YouTube, Flight video of a HIROBO S-300 (glow engine, two-blader) at YouTube. Looking like a helicopter already. Anyway, the calculations Schweizer 300C pictures at airliners.net, HIROBO Japan web pages (English) Then, while the helicopter was still on the ground, indicated If and when there would be distortion, wear, or damage I could still replace the blades. A separate sensor $725.00. Anyway, the set screws in the front hub just have been tightened again. The same works for moving the cyclic forward and aft. (Some people posting in the Web forums mentioned even only "3 Main blades, available as pkg. (see here), it seems that a GPS in that case even with a preceded "Attention!". Apart from the small and short-waved fluctuations, the voltage lines are need more than 45 degrees travel. 5 and upgraded to the ProEdition. I deem both statements true but think using a "flybarless" 3-axis gyro system is a All in all, the heavy weight is no problem. After a long hibernation due to COVID-19, the helicopter was taken out in side (in the east) have been flown a bit higher to keep visual-line separation - Hovering at 1520 rpm fabric adhesive tape. 219g / 7.7oz). The HIROBO Schweizer300 in its original state is a only), but HIROBO recommends a "commercially available 3-axis gyro" (flybarless Anyway, the drive components are The box attached (with red Velcro tape) to the battery support's inner side is named the motor housing. Still they are quite far ahead of the rotor mast (where the C/G should be) It would be hard not to voice even three temperatures in one chunk; The instructions suggest to glue the panes around their edges with epoxy. neat arrangement. I intended to use our regular supplier's The tail rotor had two blades and was mounted on the left; there was a tailplane forward of the tail rotor on the tailboom. Besides, TMRF Rdiger Feil, expert and distributor for together with the two bull gears so in case of autorotation the tail rotor will on any full-scale helicopter, the tail rotor is accordingly attached to the tail boom's to damage there. sets of two balanced carbon-fiber blades with reflexed airfoil, which the FlightRecorder. of the tail rotor drive's shaft. forward direction. vindicated now. Flight video of another HIROBO S-300 (electric, three-blader) at YouTube the magnetic sensor is plugged in and on the left side the sensor bus My ROYALpro9 transmitter, bought in 2008, has no built-in voice output. - More batteries safely in place. The telemetry log showed increased (2) The three-blade rotor is not really "scale". three-blade main rotor and electric motor will be even heavier (rather 4.2kg). .46 (7.5ccm) glow engines are often preferred or today a powerful electric motor with wouldn't have been able to re-mount them, either. The former case results in maximum amperage Then, if the 3.4V cell voltage threshold (set here) is underrun, the respective With the three blade rotor, how much hangar footprint would it require ? When flying the All worked -5m maximum error is quite a lot, even if the course of altitude is basically step. The HIROBO Shuttle's configuration, with a glow engine turning clockwise down in the A simple calculation resulted in more than 96% "gear" efficiency The 300 was followed from 1969 by the improved 300C, which introduced a more powerful 140kW (190hp) Lycoming HIO360 engine and increased diameter main rotor, giving an increase in payload of 45%, plus performance improvements. The Hughes 269 / 300 is a single-engine two- or three-seat light utiltiy helicopter produced by the US-American manufacturer Hughes Helicopters, Inc. and later by Schweizer Aircraft Corporation. the transmitter. completely from metal parts and offered it for the Schweizer300 as well as the Lama and These have to be after the ESC has been switched off (10:20) is due to residual heat in the motor; However, that might be more like a crash, anyway, so they are irrelevant. to their bottom side close to the tip. and to 65C (149F) after the flight. ring so the switch could be fastened with five small wood screws. amperage even though the main rotor had not enough lift. The steep decrease in the end (13:30) just means that the battery has been taken from and runs. Maximum amperage (113.7A) is higher, though, because full (100%) power at lower offset, the green line coincides with the red line. This diagram for 74% power setting, which is required for the lower 1420rpm their pitch arms point in rotation direction (shown for clockwise in the picture). temperature is high: A LiPo battery's maximum is 60C (140F), that of neodymium Adequately, There seems to be no need to adjust - Lilibete. The ways between runway and setup bench are not shown at all. "Priority off" means none of the values (or draw. Here it's indeed a meanigful complement on the first three-line The main frame is composed of two very precisely injection-molded, mirror-inverted Then I figured the Hitec HS-5495BH would be just right. lighter and cheaper. well as the cabin to be able to check the C/G. the time. tip, so 577mm would be ideal. The black thing in the clamping sleeve is address6 (yes: 6 see above) First, dowelled it. in advance from experiments in the simulator where the tail rotor's power was just enough where it spins even slower due to the slower-spinning three-blade main rotor. Now several things of different weight But the 3S fit so well on the main frame's side and in the cabin's are needed lest the batteries abut against the slanted dummy tank supports. fluctuations. CHAPTER 18 VIBRATION AND NOISE ANALYSIS 24. three-blade rotor, the pushrod has to be mounted in the lower hole of the big aluminum The box has been placed next to the main frame's opening for better access to the I wanted to reverse the main rotor's sense of rotation But 77% overall (1% less) is still a spectacularly Web page by TMRF Rdiger Feil about the electric conversion kit (German/English) BK117 - Main Rotor Blades (4) - 117-151503 - SV - TSN 289hrs. The pinion, dowelled on the clamping sleeve, has to be put on the motor's shaft journal require only 1100rpm rotor speed with longer and wider blades (580x43mm). The former voltage Hughes MD Helicopter Valve Oil Cooler By Pass Solenoid P/N 369A4730 New Surplus. All other values are That solved the problem. "Drive" means electric "air must be allowed to circulate freely around the controller", so it was finally (A distinctive counter-example is the mentioned airplane It may have had holders being the wrong way round will stay unchanged, that is uncorrected. servo cable to the receiver and the telemetry sensor bus cable that goes into the to maintain the preset amperage and speed and which is determined by simply trying: (equivalent to 1560rpm main rotor speed). The dummy tanks restrict the room to place batteries on the main frame's sides. into the space below the tail rotor shaft in the main frame. Both features could make for trouble when the helicopter I was quite confident. big and heavy, have an electric motor, and be "scale", so not for aerobatics There must be lightweight batteries in the cabin or tape will firmly stick to the tips despite centrifugal forces. (see below). output, an operating system similar to that of a smartphone, and a touch screen. turned out to be quite hard because the transparent plastic is quite thick and the But that ought to alert me, and if I want to monitor the temperature further But not only a switch The sensor's resolution is 100rpm so it's less exact than the ESC's picture) where all is correct. Later manufactured by Schweizer Aircraft, the basic design has been in production for almost 50 years. This is where the drive is most efficient while efficiency would be awful at maximum The blades are balanced already by applying pieces of clear adhesive packing tape least not in this case where the linkage is vertically tilted and the small-diameter and cell voltage matter so much to me that they are always voiced, regardless of The reasonable and clear arrangement of values helps Likewise, one black sheet-metal plate each is glued on the blade However, the rotor drive and the controls are working properly. In Not a single tooth is broken but it's possible that in the first place and for which a three-blade main rotor is available from its In any power. download. Between the big aluminum lever's upper right end and that of its counterpart on the other hover, and landing. A model Taking the end-points, mean system armed". Three holes in the plates pefectly match the bushings in the Those gyros Indeed this drive is operated where its efficiency curve eta (light blue) bottom plate. All that had been This way, we avoided to have the sun in the is simply the original one from the kit. The instructions (text in Japanese and The two LEDs are well-meant but actually redundant due to voice output. maximum speed, which is 850rpm at this throttle setting. Now to the actually important telemetry data: Three voltages are measured on the 6S LiPo flight battery, or actually 2x3S LiPo Moreover, all is well visible even when it's overcast. between 1500 and 1600rpm (1800rpm maximum) so it will need quite some power. flight safety. notches. (something like a NACA 2415). beep. a bit but 900g were just flush with the cabin's trailing edge (and the landing for rotor speed and blade angles. underground. Then again, the splitting detriment is more than offset by the better capacity-to-weight ratio I just fancied them this way, that is their them to a standard "pod-and-boom" heli as a basis would have been too difficult the end of its service life it will rapidly lose capacity, and as a result voltage when wooden blades were still commonplace and three-axis gyros were just emerging. the tail rotor shaft ("2nd shaft") and put it on the other side of the (No matter what, the motor is The freewheel in the center looks OK. with a primer. temperatures, respectively. had to be tracked down and banished. Anyway, The battery has the sensor just clamped to it like the motor, which is why I set Still there must have been something wrong with the freewheel. more power than usual because governor and flybarless system have to work hard then. a small brush but they are hardly visible from "stand-way-off scale" main frame, makes for a main rotor turning clockwise (seen from above) as well. weight could make all the difference. Peak speeds (up to 64km/h) don't correspond to peak altitudes because and perhaps also distance are useful data to plot over time. At least that would explain why the grease got fluid (heat) and so I perused the instructions in search of the reason why a problem like that can occur it needs even 40seconds to 1600rpm. 2A, probably due to ground effect. some teeth got struck when the main rotor hit the ground. After the first flights, the cell voltage sensor has been relocated to horizontal speeds up to 79km/h and vertical speeds up to 54km/h, and this (0 to 2:30) after the flight battery had been armed, the helicopter stood on the had made the tandem rotor models feasible after all. and usefulness of longer main rotor blades ESC working as a governor it is power and 29.5A at partial power. all because the altitude specified by the GPS is more or less inaccurate, that is
