Kinebohのブログ一覧

Stuck and clogged Hex bolts connecting with drive shaft and stub shaft on the rear axle of air-cooled VW 1302 Super Beetle prevented me from proceeding to the procedure of replacing hub bearings yesterday, any Hex wrenches were unacceptable because of sticking power, also Vice Grip tool. Though streaking to utilize the Nut cracker special tool for the purpose shown in the picture, probably makes it effective to loosen them, but,I determined to postpone this heavy work until the clutch disk replacement would be required, 10,000 km more. The strange note must be caused not by the rear hub bearings but by the differential side angular roller bearing on the left side. Drive pinion and crown gear touching surface relation must be adjusted by inserting adequate thickness adjusting sim insertion, as a matter of fact. As the following procedure, unburdening AD motor, trans-axle body and almost of full restoring of them should be done at that time. This is the reason why I gave up yesterday, the biggest operation those are not popular among Laymen nor Sunday mechanics, hobby player like myself, but I have enough brave and strong intention to do that by myself.

Any error correction or measure should be done immediately after being found, no waiting, no postponing are allowed, otherwise, it might be left undone until more miserable disaster would happen in future, however trifle it might be!
Now, long hesitating heavy and dusty work would begin this afternoon, that is the rear hub bearing replacement on air-cooled VW 1302 Super Beetle. Asking about this procedure that looks difficult to TOKYO My Bows shop, he said it is not difficult and possible, additionally he said, the replacement hub bearing brand had been changed from foreign one HUG into Japanese NTN because of some reason. As my keeping parts are HUG, I'll go with these then in case of any trouble, I'll do the same with NSK bearings that my favorite.
Checking from the out side, no ugly over heating and overflowing of impact grease leak phenomena there were observed, anyway, disassembling this afternoon would clear the problem.

Rookie 20 flight yesterday gave me much information about the introduction of YS fuel pressure injection system to OS 32FS motor, as a matter of fact, original 3H carburetor was replaced into 4H that has some different fuel narrow down control spray nozzle, not needle but a triangular slit. Of course, the original angular shape was modified to adopt with higher fuel pressure condition with YS system. Comparing with the narrower slit in YS45FR motor, the shape was re-modified and this experimental trial was to the point, not hesitation, no tendency of coughing was observed while the test flight instead smooth transition from slow to middle and to hi was obtained. Rookie 20 trainer shoulder wing plane would have finished as a motor test bench as actual flight use and the motor would be replaced into regular one 25FSR on the other hand, 32 motor would be burdened on TETRA Spitfire Mk5B 50 4cycle scale plane as a stable and good conditioned power plant, because I have a intention to take part in 4C Scale model competition in future.

I found out the cause of right side twisting bad habit of YOSHIOKA Pegasus 40 while looping, the parallelism between the main wing and stabilizer is not established, both of the main wing are set with some slight right side inclination! This discrepancy would be corrected by grinding the holes on the fuselage for connecting center aluminum alloy pipe. The holes would be reformed by self curing resin material. As this plane was given to me for free of charge including servos, a FM reciever and OS 40LA motor, I have no way to complaint on this discrepancy, the critical one, twisted right main wing had been corrected before. Probably, the effort to have given programable mixing condition yesterday would be in vain by the correction of main wing setting condition onto the fuselage.

All of the parts and special tools have prepared for replacing rear hub bearings in air-cooled VW 1302 Super Beetle now! As I have never experienced the procedure like this, I am excited a little. Tightened front hub bearings contributed to obtain more stable steering action while straight running on the highway. Additional maintenance on rear hub bearings would show more stable and astringent steering reaction on ordinary and high way, it's original condition would re-obtained. This relatively heavy work would be performed on next holiday.

Excluding the flutter phenomena on stabilizer end and rudder tip, the construction there were re-made intentionally. Originally, Kyosho Sukhoi Su-31 40 ARF kit was so designed to enjoy slow speed flight 3D maneuver, the speed flight often invited while F3A maneuver is not the purpose, all the moving wings, aileron, rudder and elevator occupy relatively larger area than F3A. This difference of concept has fundamental design concept, so, some re-making is required for preventing the fatal results. Following this principle, all the tail moving wings were done on Su-31 before the first rolling out. Probably, increasing main wing span 10cm and extension of tail moment arm 10cm, and remaking tail moving wings would adopt on to F3A pattern use, these modified are all based on my own experiences for more than half a century with the number of ever lost airplanes number summing up 200. The 40 years old motor YS 60 SR motor would suit with this new model especially while straight rising up maneuver.
Reinforcement on the horn setting area also are indispensable requirement that should be done at any rate, any weak point on the movable wings while maneuver also the item not to be forgotten, pieces of thin plywood would be inserted between horn bases and attaching surfaces keeping the physical property of Redundant system. Realized disadvantage caused by lack of consideration should be measured urgently however difficult it may be. Remember that, "Piled trifles are not trifle, but great."